A car showroom has 6 blue cars (B),8 white cars (W) and 4 maroon cars (M). Two cars are sold. Draw a probability tree to represent this information. Determine the probability that: a) Both cars sold were white. b) No white car was sold.

Answers

Answer 1

The probability that no white car was sold is 10/18 × 9/17 = 15/34Answer: a) 14/51 b) 15/34.

A car showroom has 6 blue cars (B),8 white cars (W) and 4 maroon cars (M). Two cars are sold. The probability tree diagram to represent the given information is as follows:The probability that both cars sold were white:We have to find the probability of two white cars which are sold out of 18 cars. Therefore, the probability of choosing the first white car is 8/18.Then, the probability of choosing the second white car is 7/17 (as one car has already been taken out).Therefore, the probability of both cars sold were white is 8/18 × 7/17=14/51

The probability that no white car was sold:We have to find the probability of not choosing any white car while selling out of 18 cars. Therefore, the probability of choosing a car that is not white on the first go is 10/18.Then, the probability of choosing a car that is also not white on the second go is 9/17 (as one car has already been taken out).Therefore, the probability that no white car was sold is 10/18 × 9/17 = 15/34Answer: a) 14/51 b) 15/34.

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Related Questions

Tattoo studio BB in LIU offers tattoos in either color or black and white.
Of the customers who have visited the studio so far, 30 percent have had black and white tattoos. In a
subsequent customer survey, BB asks its customers to indicate whether they are satisfied or
not after the end of the visit. The percentage of satisfied customers has so far been 75 percent. Of those who did
a black and white tattoo, 85 percent indicated that they were satisfied.
a) What percentage of BB customers have had a black and white tattoo done and are satisfied?

b) What is the probability that a randomly selected customer who is not satisfied has had a tattoo done in
color?

c) What is the probability that a randomly selected customer is satisfied or has had a black and white tattoo
or both have done a black and white tattoo and are satisfied?

d) Are the events "Satisfied" and "Selected black and white tattoo" independent events? Motivate your answer.
e) 10 customers visit BB during a day. Everyone wants a tattoo in color. How big is
the probability that fewer than three of these customers will be satisfied?
Management: what distribution does X="number of satisfied customers out of 10 randomly selected customers" have?

Answers

The percentage of BB customers who have had black and white tattoos done and are satisfied is 0.225 (22.5%).The probability that a randomly selected customer who is not satisfied has had a tattoo done in color is 0.6 (60%).
The probability that a randomly selected customer is satisfied or has had a black and white tattoo or both have done a black and white tattoo and are satisfied is 0.675 (67.5%).If the events were independent, then the probability of being satisfied would be the same regardless of whether the customer had a black and white tattoo or not. The probability that fewer than three of these customers will be satisfied is 0.6496.

a)  Let's first calculate the probability that a BB customer is satisfied and has a black and white tattoo done: P(S ∩ BW) = P(BW) × P(S|BW)= 0.3 × 0.85= 0.255So, the percentage of BB customers who have had black and white tattoos done and are satisfied is 0.255 or 25.5%.

b) Let's calculate the probability that a randomly selected customer is not satisfied and has had a tattoo done in color:P(S') = 1 - P(S) = 1 - 0.75 = 0.25P(C) = 1 - P(BW) = 1 - 0.3 = 0.7P(S' ∩ C) = P(S' | C) × P(C) = 0.6 × 0.7 = 0.42So, the probability that a randomly selected customer who is not satisfied has had a tattoo done in color is 0.6 or 60%.

c) Let's calculate the probability that a randomly selected customer is satisfied or has had a black and white tattoo or both have done a black and white tattoo and are satisfied:P(S ∪ BW) = P(S) + P(BW) - P(S ∩ BW)= 0.75 + 0.3 - 0.255= 0.795So, the probability that a randomly selected customer is satisfied or has had a black and white tattoo or both have done a black and white tattoo and are satisfied is 0.795 or 79.5%.

d) The events "Satisfied" and "Selected black and white tattoo" are dependent events because the probability of being satisfied depends on whether the customer had a black and white tattoo or not.

e) Let X be the number of satisfied customers out of 10 randomly selected customers. We want to calculate P(X < 3).X ~ Bin(10, 0.75)P(X < 3) = P(X = 0) + P(X = 1) + P(X = 2)= C(10, 0) × 0.75⁰ × 0.25¹⁰ + C(10, 1) × 0.75¹ × 0.25⁹ + C(10, 2) × 0.75² × 0.25⁸= 0.0563 + 0.1877 + 0.4056= 0.6496So, the probability that fewer than three of these customers will be satisfied is 0.6496.

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A rectangular airstrip measures 34.10 m by 290 m, with the width measured more accurately than the length. Find the area (in m2), taking into account significant figures.
[a] m^2

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The area of the rectangular airstrip, taking into account significant figures, is  [tex]9899 m^2[/tex] .

To find the area of the rectangular airstrip, we multiply the length by the width:

Area = Length × Width

Given:

Length = 34.10 m (with four significant figures)

Width = 290 m (with three significant figures)

To determine the appropriate number of significant figures in the result, we use the rule that the result of a multiplication or division should have the same number of significant figures as the factor with the fewest significant figures.

In this case, the width has three significant figures, so the result should also have three significant figures.

Calculating the area:

Area = 34.10 m × 290 m

Area = [tex]9899 m^2[/tex] (rounded to three significant figures)

Therefore, the area of the rectangular airstrip, taking into account significant figures, is  [tex]9899 m^2[/tex] .

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Use Tayior's formula for f(x,y) at the origin to find quadratic and cubic approximations of f(x,y)=3/(1−3x−y) near the origin. The quadratic approximation for f(x,y) is

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The quadratic approximation of f(x, y) near the origin is f(x, y) ≈ 3 + 9x + 3y + 9x² + 6y² + 6xy

To find the quadratic approximation of the function f(x, y) = 3/(1 - 3x - y) near the origin using Taylor's formula, we need to compute the first and second-order partial derivatives of f(x, y) and evaluate them at the origin (0, 0).

First-order partial derivatives:

∂f/∂x = -3/(1 - 3x - y)² * (-3) = 9/(1 - 3x - y)²

∂f/∂y = -3/(1 - 3x - y)² * (-1) = 3/(1 - 3x - y)²

Evaluating the first-order partial derivatives at (0, 0):

∂f/∂x(0, 0) = 9

∂f/∂y(0, 0) = 3

Now, let's find the second-order partial derivatives:

∂²f/∂x² = 18/(1 - 3x - y)³

∂²f/∂y² = 6/(1 - 3x - y)³

∂²f/∂x∂y = 6/(1 - 3x - y)³

Evaluating the second-order partial derivatives at (0, 0):

∂²f/∂x²(0, 0) = 18

∂²f/∂y²(0, 0) = 6

∂²f/∂x∂y(0, 0) = 6

Using these derivatives, we can construct the quadratic approximation:

Quadratic approximation:

f(x, y) ≈ f(0, 0) + ∂f/∂x(0, 0)x + ∂f/∂y(0, 0)y + (1/2)∂²f/∂x²(0, 0)x² + ∂²f/∂y²(0, 0)y² + ∂²f/∂x∂y(0, 0)xy

Substituting the values we obtained:

f(x, y) ≈ 3 + 9x + 3y + (1/2)(18x²) + (6y²) + (6xy)

Simplifying:

f(x, y) ≈ 3 + 9x + 3y + 9x² + 6y² + 6xy

Therefore, the quadratic approximation of f(x, y) near the origin is:

f(x, y) ≈ 3 + 9x + 3y + 9x² + 6y² + 6xy

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Use the bisection method up to five iterations and find the root to 3 decimal places for the following: f(x) = x^2 - 3x + 1 in the interval [0,1]


Please help.

Answers

The root of the quadratic function f(x) = x² - 3x + 1 in the interval [0, 1] is: D. 0.391.

How to determine the root of the quadratic function?

In order to determine the root of the quadratic function f(x) = x² - 3x + 1 in the interval [0, 1], we would apply the bisection method. Generally speaking, the bisection method makes an iteration by repeatedly dividing interval with respect to the output value of a function.

f(0) = 1, f(1) = -1. Interval: [0, 1]; midpoint: (0 + 1)/2 = 1/2.

For the first iteration, we have:

f(1/2) < 0. Interval: [0, 1/2]; midpoint: (0 + 1/2)/2 = 1/4

For the second iteration, we have:

f(1/4) > 0. Interval: [1/4, 1/2]; midpoint: (1/4 + 1/2)/2 = 3/8

For the third iteration, we have:

f(3/8) > 0. Interval: [3/8, 1/2]; midpoint: (3/8 + 1/2)/2 = 7/16

For the fourth iteration, we have:

f(7/16) < 0. Interval: [3/8, 7/16]; midpoint: (3/8 + 7/16)/2 = 13/32

For the fifth iteration, we have:

f(13/32) < 0. Interval: [3/8, 13/32]; midpoint: (3/8 + 13/32)/2 = 25/64

Therefore, the approximate solution after five iterations is given by:

x ≈ 25/64

x ≈ 0.390625 ≈ 0.391.

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Imagine you want to estimate the effect of getting affordable student housing in Uppsala on university students' probability of finishing their degree at Uppsala University. You know that student housing for first-year students in Lund is determined randomly to be as fair as possible. The housing company (Student Living) assigns every new student a slot in the housing queue using a lottery. Students who get a low number are placed first in the queue and will get a housing contract quickly, whereas students with a high number will have to wait very long to be able to get a student housing contract. Student Living has full control of the student housing contracts and there is no way to skip the queue. a) You want to use the housing lottery as an instrument for getting student housing during a person's first year of university studies, but you expect the treatment effects to be heterogeneous. What are the assumptions that need to hold for your IV analysis to work when treatment effects are heterogeneous? Name the assumptions and explain what they mean. b) Name the four sub-groups of the population that exist with respect to the treatment effects and explain who they are in this scenario. Is it likely that they all exist in this scenario? c) Write down the equations you will estimate to get the causal effect of student housing on the probability of students finishing their degree. Clearly explain what all components of the equations represent, and which parameter that gives you the causal effect. d) What is the causal effect you can obtain called? What does it measure?

Answers

IV analysis with heterogeneous treatment effects relies on assumptions of relevance, exclusion restriction, and independence to estimate the local average treatment effect (LATE) of student housing on the probability of degree completion for compliers.

a) Assumptions for IV analysis with heterogeneous treatment effects:

Relevance: The instrument (housing lottery) should be correlated with the treatment (getting affordable student housing) and have a significant impact on it.

Exclusion Restriction: The instrument should only affect the outcome (probability of finishing the degree) through its impact on the treatment and should not have any direct effect on the outcome.

Independence: The instrument should be independent of other factors that may affect the outcome, except through its relationship with the treatment.

b) Four sub-groups with respect to treatment effects:

Compliers: Students who receive student housing through the lottery and complete their degree due to housing assistance.

Always-takers: Students who would complete their degree regardless of receiving student housing.

Never-takers: Students who would not complete their degree regardless of receiving student housing.

Defiers: Students who receive student housing but do not complete their degree, going against the expected treatment effect.

In this scenario, it is likely that all four sub-groups exist since individuals may have varying responses to receiving student housing.

c) Equations to estimate the causal effect:

Y = β0 + β1X + β2Z + ε

Y represents the outcome (probability of finishing the degree).

X represents the treatment indicator (receiving student housing or not).

Z represents the instrumental variable (housing lottery).

β1 estimates the average treatment effect, and β2 estimates the effect of the instrument on the treatment.

X = α0 + α1Z + ν

X represents the treatment indicator (receiving student housing or not).

Z represents the instrumental variable (housing lottery).

α1 estimates the local average treatment effect (effect of the instrument on the treatment for compilers).

d) The causal effect obtained is called the local average treatment effect (LATE), which measures the effect of receiving student housing on the probability of finishing the degree for compilers (those influenced by the instrument).

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Solve for the inequality for x. X-c/d>y(for d>0)

A. X
B. X>dy-c

C. X
D. X>dy+c

Answers

Start by multiplying both sides of the inequality by d to get rid of the denominator. B. X > dy - c

To solve the inequality X - c/d > y, we want to isolate the variable X. Start by multiplying both sides of the inequality by d to get rid of the denominator:

[tex]d(X - c/d) > dy[/tex]

Simplify by distributing the d on the left side:

[tex]dX - c > dy[/tex]

Now, add c to both sides to isolate the term with X:

[tex]dX > dy + c[/tex]

Finally, divide both sides of the inequality by d (since d > 0) to solve for X:

[tex]X > dy + c[/tex]

Therefore, the correct answer is B. X > dy - c.

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Two symbols are used for the standard deviation: σ and s. a. Which represents a parameter and which represents a statistic? b. To estimate the commute time for all students at a college, 300 students are asked to report their commute times in minutes. The standard deviation for these 300 commute times was 12.2 minutes. Is this standard deviation σ or s ? a. represents a parameter. represents a statistic. b. ninutes S Two symbols are used for the standard deviation: σ and s. a. Which represents a parameter and which represents a statistic? b. To estimate the commute time for all students at a college, 300 students are asked to report their commute times in minutes. The standard deviation for these 300 commute times was 12.2 minutes. Is this standard deviation or s? a. represents a parameter. represents a statistic. b. =12.2 minutes σ S Two symbols are used for the standard deviation: σ and s. a. Which represents a parameter and which represents a statistic? b. To estimate the commute time for all students at a college, 300 students are asked to report their commute times in minutes. The standard deviation for these 300 commute times was 12.2 minutes. Is this standard deviation σ or s? a. represents a parameter. represents a statistic.

Answers

The standard deviation is s, not σ. This is the answer to part (b).b. s = 12.2 minutesTherefore, the standard deviation is a statistic, which is represented by the symbol

The standard deviation is an important concept in statistics. Two symbols are used for the standard deviation: σ and s. σ is used to represent the population standard deviation, while s is used to represent the sample standard deviation. This is the answer to

part (a).a. σ represents a parameter. s represents a statistic.To estimate the commute time for all students at a college, 300 students are asked to report their commute times in minutes. The standard deviation for these 300 commute times was 12.2 minutes.

Since the data is obtained from a sample, the standard deviation is s, not σ. This is the answer to part (b).b. s = 12.2 minutesTherefore, the standard deviation is a statistic, which is represented by the symbol s.

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6.2. For each of the following functions, decide whether it is injective, surjective, and/or bijective. If the function is a bijection, what is its inverse? If it is injective but not surjective, what is its inverse on the image of its domain? (a) f:Z→Z, where f(n)=2n.

Answers

The function f: Z → Z, where f(n) = 2n, is injective, surjective, and bijective. Its inverse function is g: Z → Z, where g(n) = n/2, which maps each input to its corresponding half.

(a) The function f: Z → Z, where f(n) = 2n.

Injective: To determine if the function is injective (one-to-one), we need to check if different inputs map to different outputs. In this case, if we take two different integers, say a and b, and assume f(a) = f(b), we can see that f(a) = 2a and f(b) = 2b. For the equality f(a) = f(b) to hold, it must be that 2a = 2b, which implies a = b. Therefore, the function is injective.

Surjective: To determine if the function is surjective (onto), we need to check if every element in the codomain (Z) has a corresponding pre-image in the domain (Z). In this case, for any integer n in Z, we can find an integer k in Z such that f(k) = n. This is because we can simply take k = n/2, which will give us f(k) = 2k = 2(n/2) = n. Therefore, the function is surjective.

Bijective: Since the function is both injective and surjective, it is bijective.

Inverse: To find the inverse of the function, we need to swap the roles of the domain and the codomain, resulting in a new function g: Z → Z, where g(n) = n/2. The inverse function maps each output of the original function back to its corresponding input.

Note: It is worth mentioning that in the case of integers, the division by 2 may result in non-integer outputs. However, for the purpose of finding the inverse, we assume real numbers as intermediate steps.

Inverse on the Image of the Domain: If we consider the image of the domain, which is the set of all even integers, the inverse function would be g: {2n | n ∈ Z} → Z, where g(n) = n/2. In this case, the inverse function maps each even integer n to its corresponding half, which is a real number.

Therefore, the function f: Z → Z, where f(n) = 2n, is injective, surjective, and bijective. Its inverse function is g: Z → Z, where g(n) = n/2, which maps each input to its corresponding half.

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Find each function value and the limit for f(x)= 13-8x³/4+x³. Use −[infinity] or [infinity] where appropriate.
(A) f(−10)
(B) f(−20)
(C) limx→−[infinity]f(x)

Answers

(A) The value of f(-10) is approximately -8.04. (B) The value of f(-20) is approximately -8.006. (C) As x approaches negative infinity, the limit of f(x) is equal to 1.

(A) f(-10):

Substituting x = -10 into the function:

f(-10) = (13 - 8(-10)^3) / (4 + (-10)^3)

= (13 - 8(-1000)) / (4 - 1000)

= (13 + 8000) / (-996)

= 8013 / (-996)

≈ -8.04

(B) f(-20):

Substituting x = -20 into the function:

f(-20) = (13 - 8(-20)^3) / (4 + (-20)^3)

= (13 - 8(-8000)) / (4 - 8000)

= (13 + 64000) / (-7996)

= 64013 / (-7996)

≈ -8.006

(C) limx→-∞ f(x):

Taking the limit as x approaches negative infinity:

lim(x→-∞) f(x) = lim(x→-∞) (13 - 8x^3) / (4 + x^3)

As x approaches negative infinity, the highest power of x dominates the expression. The term 8x^3 grows much faster than 13 and 4, so the limit becomes:

lim(x→-∞) f(x) ≈ lim(x→-∞) (8x^3) / (8x^3) = 1

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Given that loga = 4 and logb = 6, then evaluate log(a²√b)
Select one:
O a. 19
O b. none of these
O c. 11
O d. 24

Answers

The value of the logarithmic expression [tex]log(a^2\sqrt{b})[/tex] is 11. The correct option is (c) 11.

To evaluate [tex]log(a^2\sqrt{b})[/tex], we can use logarithmic properties to simplify the expression.

First, let's rewrite the expression using logarithmic rules:

[tex]log(a^2\sqrt{b}) = log(a^2) + log(\sqrt{b})[/tex]

Using the power rule of logarithms, we can simplify [tex]log(a^2)[/tex] as:

[tex]log(a^2)[/tex] = 2 * log(a)

Given that log(a) = 4, we can substitute it into the equation:

[tex]log(a^2)[/tex]  = 2 * log(a) = 2 * 4 = 8

Next, let's simplify [tex]log(\sqrt{b})[/tex]  using the property:

[tex]log(\sqrt{b})[/tex]  = 1/2 * log(b)

Given that log(b) = 6, we can substitute it into the equation:

[tex]log(\sqrt{b})[/tex] = 1/2 * log(b) = 1/2 * 6 = 3

Now, let's substitute these simplified expressions back into the original equation:

[tex]log(a^2\sqrt{b}) = log(a^2) + log(\sqrt{b})[/tex] = 8 + 3 = 11

Therefore, the value  [tex]log(a^2\sqrt{b})[/tex] is 11. The correct option is (c) 11.

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Rationalize the numerator. Assume all expressions under radicals represent positive numbers.
√12/ √14 =

Answers

The rationalized form of the numerator √12 in the expression √12/√14 is 2√3.

To rationalize the numerator, we want to eliminate the radical from the numerator by multiplying both the numerator and denominator by a suitable expression that gets rid of the radical. In this case, the square root of 12 can be simplified as follows:

√12 = √(4 × 3) = √4 × √3 = 2√3

Therefore, the rationalized form of the numerator is 2√3.

In the expression √12/√14, the denominator does not require rationalization as it already contains a radical. So the final simplified form of the expression is (2√3)/√14.

Note: It's important to mention that when rationalizing, we multiply both the numerator and the denominator by the same expression in order to maintain the equality of the fraction.

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Nathan has a 15ft. x 30ft. garden. His neighbor has a 10yd. x 20yd. garden. Which statement is true?

Nathan's garden is 1.5 times larger.

Nathan's garden is 2 times smaller.

Nathan's garden is 2.25 times larger.

Nathan's garden is 4 times smaller.

Answers

Nathan's garden is 2.25 times larger than his neighbor's garden.

Explanation:

To compare the sizes of the two gardens, we need to convert their measurements to a consistent unit. Nathan's garden has dimensions of 15ft. x 30ft., while his neighbor's garden has dimensions of 10yd. x 20yd.

To compare the areas, we can convert the measurements to a common unit, such as square feet.

Nathan's garden has an area of 15ft. x 30ft. = 450 square feet.

His neighbor's garden has an area of 10yd. x 20yd. = (10yd. x 3ft./yd.) x (20yd. x 3ft./yd.) = 900 square feet.

Comparing the two areas, we find that Nathan's garden is 450 square feet, while his neighbor's garden is 900 square feet. Therefore, Nathan's garden is 2.25 times larger (900/450 = 2.25) than his neighbor's garden.

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Consider the argument I will get grade A in this course or I will not graduate. If I do not graduate, I will join the army. I got grade A Therefore, I will not join the army. Is this a valid argument?

Answers

The argument is a valid hypothetical syllogism, satisfies three conditions: both premises are true, the conclusion is a logical consequence of the premises, and the argument is valid under any interpretation. This logical reasoning pattern uses an if-then statement to make a conclusion, indicating that if one condition is satisfied, the other will not be.

The given argument is a valid argument and is an example of a hypothetical syllogism. The argument is logically valid because it satisfies the following conditions:1. Both premises are true.2. The conclusion is a logical consequence of the premises.3. The argument is valid under any interpretation of the statements.Therefore, since it satisfies these three conditions, the argument is valid.

A hypothetical syllogism is a logical reasoning pattern that makes use of an if-then statement to make a conclusion. In this type of syllogism, if the antecedent of one conditional statement becomes the consequent of another conditional statement, it is said to be a valid argument.

The argument presented in the question follows this pattern because it says that if one condition is satisfied, then the other will not be. Therefore, it is a valid argument, and its content is loaded, since it contains logical reasoning through the use of hypothetical syllogism.

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What is the variance of the following dataset? D = {1, 2, 3, 2}

Answers

The variance of the dataset D is 0.5.

To calculate the variance of a dataset, we need to follow these steps:

Calculate the mean of the dataset.

Subtract the mean from each data point and square the result.

Calculate the mean of the squared differences.

This mean is the variance.

Let's calculate the variance for the dataset D = {1, 2, 3, 2}:

Step 1: Calculate the mean

mean = (1 + 2 + 3 + 2) / 4 = 2

Step 2: Subtract the mean and square the result for each data point

[tex](1 - 2)^2[/tex] = 1

[tex](2 - 2)^2[/tex] = 0

[tex](3 - 2)^2[/tex] = 1

[tex](2 - 2)^2[/tex] = 0

Step 3: Calculate the mean of the squared differences

mean = (1 + 0 + 1 + 0) / 4 = 0.5

Therefore, the variance of the dataset D = {1, 2, 3, 2} is 0.5.

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Find the average quarterly loads for the rest of the years.

Find the quarterly seasonal indices by dividing the actual quarterly loads by the average quarterly loads for a year. For​ example, for Quarter​ 1, Year​ 1, the seasonal index is

Answers

To find the average quarterly loads for the rest of the years, you can use the formula below:

Average Quarterly Load = Total Annual Load  4 For example, let's say the total annual load for Year 1 is 800.

To find the average quarterly loads for Year 1, we would divide 800 by 4 to get an average quarterly load of 200. Then, you can use this average quarterly load to find the seasonal indices for each quarter of each year.To find the seasonal index for a given quarter and year, you would divide the actual quarterly load by the average quarterly load for that year.

For example, let's say the actual load for Quarter 1, Year 1 is 240. To find the seasonal index for this quarter and year, we would divide 240 by 200 to get a seasonal index of 1.2. You would repeat this process for each quarter and year to find the seasonal indices for all quarters and years.

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Evaluate the improper integral or state that it is divergent.  −[infinity]∫−2​ (2/x4)dx.

Answers

The improper integral ∫[-∞,-2] (2/x^4) dx converges and its value is 1/12.To evaluate the improper integral ∫[-∞,-2] (2/x^4) dx, we need to determine whether the integral converges or diverges.

Let's find the antiderivative of the integrand: ∫ (2/x^4) dx = -2/(3x^3). Now we can evaluate the integral: ∫[-∞,-2] (2/x^4) dx = lim(a→-∞) ∫[a,-2] (2/x^4) dx = lim(a→-∞) [-2/(3x^3)] evaluated from a to -2 = lim(a→-∞) (-2/(3(-2)^3)) - (-2/(3a^3)) = 1/12 - lim(a→-∞) (2/(3a^3)). To determine whether the integral converges or diverges, we need to evaluate the limit as a approaches negative infinity. As a approaches negative infinity, the term (2/(3a^3)) approaches 0, since the denominator becomes extremely large.

Therefore, the limit becomes: lim(a→-∞) (2/(3a^3)) = 0. So, the integral converges and its value is 1/12. Therefore, the improper integral ∫[-∞,-2] (2/x^4) dx converges and its value is 1/12.

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Hi! I am really struggling with this and I need help. I did it multiple times and kept getting 290cm^2. DO NOT JUST GIVE ME AN ANSWER, PLEASE EXPLAIN SO I KNOW FOR THE FUTURE!! THANK YOU!

Answers

Answer:

I think the answer is 255cm squared

Step-by-step explanation:

If you look at the shape it has 2 shapes. A rectangle and a triangle.

17-10 to get the height of the triangle = 7

22-12 to get the base of the triangle = 10

The area to find a triangle is 1/2 * b * h

= (7 *10) / 2

= 35

To find the rectangle =

22 * 10

= 220

To find the area of the whole thing =

35 (triangle) + 220 (rectangle) = 255cm squared

Answer:

255 cm^

Step-by-step explanation:

If you cut your shape into a triangle and rectangle...or a trapezoid and a rectangle, then add the areas together.

Area of a rectangle is just length × width.



Area of a triangle is:

A = 1/2bh

Area of a trapezoid is:

A = 1/2(b1 + b2)

see image to see two different ways to cut the whole shape into two pieces. Then we calculate the total by adding the areas of the parts.

see image.

I need help with this please​

Answers

The length of the missing side of triangle ABC which is similar to triangle DEF would be = 30.

How to calculate the missing part of the triangle ABC?

To determine the missing part of the triangle, the formula for scale factor should be used and it's given below as follows:

Scale factor = bigger dimension/smaller dimension

where ;

Bigger dimension = 56

smaller dimension = 16

scale factor = 56/16 = 3.5

The missing length of ABC which is line AC:

= 105/3.5

= 30

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Standard Form of a Quadratic Equation The following are quadratic equations. Select the equations that are in the An equation of the type standard form. ax
2
+bx+c=0, where a,b, and c are realnumber constants and a>0, is called the 5a
2
=8a standard form of a quadratic equation. 3x
2
−x−9=0 12m
2
=144 4x
2
+7x−5=0 For each function, type the maximum or minimum value for the parabola in the blank next to the fu

Answers

In the given quadratic equations, the maximum or minimum values for the parabolas are: Maximum value: -61/12, Minimum value: -239/32

The quadratic equations that are in standard form, which is given by ax^2 + bx + c = 0, where a, b, and c are real number constants and a > 0, are:

3x^2 - x - 9 = 0

4x^2 + 7x - 5 = 0

The equation 12m^2 = 144 is not in standard form because it lacks the terms with x.

To find the maximum or minimum value for the parabola, we need to determine the vertex of the parabola. The vertex can be found using the formula x = -b / (2a). Once we find the x-coordinate of the vertex, we can substitute it back into the quadratic equation to find the corresponding y-coordinate.

For the equation 3x^2 - x - 9 = 0:

a = 3, b = -1, c = -9

x = -(-1) / (2 * 3) = 1/6

Substituting x = 1/6 back into the equation:

y = 3(1/6)^2 - (1/6) - 9 = -61/12

The maximum or minimum value for the parabola is y = -61/12.

For the equation 4x^2 + 7x - 5 = 0:

a = 4, b = 7, c = -5

x = -7 / (2 * 4) = -7/8

Substituting x = -7/8 back into the equation:

y = 4(-7/8)^2 + 7(-7/8) - 5 = -239/32

The maximum or minimum value for the parabola is y = -239/32.

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Consider the following simple regression model y = β0 + β1x + u, with z being an instrument for x. Suppose Corr(x,u) > 0, Corr(z,x) > 0, and Corr(z,u) < 0. Then, the IV estimator has a(n) _______.

a. ​asymptotic bias

b. downward bias

c. no bias

d. upward bias

Answers

The correct answer is b. downward bias. The instrumental variable (IV) estimator in the given regression model has a downward bias. This bias arises due to the correlation patterns between the variables involved: Corr(x,u) > 0, Corr(z,x) > 0, and Corr(z,u) < 0.

These correlation conditions create a situation where the IV estimator underestimates the true coefficient of the independent variable (x), resulting in a downward bias.

In instrumental variable regression, the IV estimator is used to address endogeneity issues when there is a correlation between the independent variable (x) and the error term (u). The instrument (z) is employed to provide a source of variation for x that is unrelated to u.

In the given scenario, the positive correlation between x and u (Corr(x,u) > 0) indicates endogeneity or omitted variable bias. The positive correlation between z and x (Corr(z,x) > 0) suggests that z is a valid instrument for x. However, the negative correlation between z and u (Corr(z,u) < 0) implies that z is not perfectly exogenous and may have some correlation with the error term.

Due to this correlation pattern, the IV estimator is downward biased, meaning it underestimates the true coefficient of x. This bias occurs because the instrument does not fully capture the variation in x that is unrelated to u, leading to an attenuation bias in the estimated coefficient.

Therefore, the correct answer is b. downward bias.

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Find an equation of the tangent line to the curve y
2+(xy+1)3=0 at (2,−1).

Answers

The equation of the tangent line is y = 1/2x - 2.

The equation of the tangent line to the curve given by 2 + (xy + 1)^3 = 0 at the point (2, -1) can be found by taking the derivative of the equation with respect to x and evaluating it at the given point.

Differentiating both sides of the equation with respect to x using the chain rule, we get 0 = 3(xy + 1)^2 (y + xy') + x(y + 1)^3, where y' represents the derivative of y with respect to x.

Substituting the coordinates of the point (2, -1) into the equation, we have 0 = 3(2(-1) + 1)^2 (-1 + 2y') + 2(-1 + 1)^3. Simplifying further, we find 0 = 3(1)(-1 + 2y') + 0.

Since the expression simplifies to 0 = -3 + 6y', we can isolate y' to find the slope of the tangent line. Rearranging the equation gives us 6y' = 3, which implies y' = 1/2. Therefore, the slope of the tangent line at the point (2, -1) is 1/2.

To find the equation of the tangent line, we use the point-slope form of a line: y - y1 = m(x - x1), where (x1, y1) is the given point and m is the slope. Substituting the values into the equation, we get y - (-1) = 1/2(x - 2), which simplifies to y + 1 = 1/2x - 1. Rearranging the terms, the equation of the tangent line is y = 1/2x - 2.

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Find d2y​/dx2 if −8x2−3y2=−5 Provide your answer below: d2y/dx2​ = ____

Answers

To find d^2y/dx^2 for the equation -8x^2 - 3y^2 = -5, we need to differentiate the equation twice with respect to x. Let's begin by differentiating the given equation once: d/dx (-8x^2 - 3y^2) = d/dx (-5).

Using the chain rule, we get:

-16x - 6y(dy/dx) = 0.

Next, we need to differentiate this equation again. Applying the chain rule and product rule, we have:

-16 - 6(dy/dx)^2 - 6y(d^2y/dx^2) = 0.

Now, we need to solve this equation for d^2y/dx^2. Rearranging the terms, we get:

6y(d^2y/dx^2) = -16 - 6(dy/dx)^2.

Dividing both sides by 6y, we obtain:

d^2y/dx^2 = (-16 - 6(dy/dx)^2) / (6y).

Therefore, the expression for d^2y/dx^2 for the given equation -8x^2 - 3y^2 = -5 is:

d^2y/dx^2 = (-16 - 6(dy/dx)^2) / (6y).

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what are the conditions for using the standard deviation formula

Answers

The standard deviation formula is used to calculate the measure of variability or dispersion within a dataset.

The standard deviation formula provides information about how spread out the values are from the mean.

The formula for calculating the standard deviation is as follows:

Standard Deviation (σ) = √[(Σ(xi - μ)²) / N]

where:

- xi represents each individual value in the dataset.

- μ represents the mean (average) of the dataset.

- Σ(xi - μ)² represents the sum of the squared differences between each value and the mean.

- N represents the total number of values in the dataset.

There are a few conditions or assumptions that should be met in order to use the standard deviation formula appropriately:

1. The data should be quantitative: The standard deviation is primarily used for numerical data, as it relies on numerical calculations.

It is not suitable for categorical or nominal data.

2. The data should follow a symmetric distribution: The standard deviation assumes that the data follows a symmetric distribution, such as the normal distribution.

If the data is heavily skewed or has outliers, the standard deviation may not provide an accurate representation of the variability.

3. The data should be independent: The standard deviation assumes that the data points are independent of each other. In other words, the values in the dataset should not be influenced by or dependent on each other.

4. The data should be a random sample: When calculating the standard deviation for a population, the formula mentioned above is used. However, if the data is from a sample rather than the entire population, the formula may need to be adjusted slightly to account for the degrees of freedom.

5. The data should be measured on an interval or ratio scale: The standard deviation is most appropriate for data measured on an interval or ratio scale. This means that the numerical values have equal intervals and a meaningful zero point.

By ensuring that these conditions are met, the standard deviation formula can be effectively used to calculate the measure of variability within a dataset. It provides valuable insights into the spread or dispersion of the data points, allowing for better understanding and analysis of the data.

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Max has $35 a day to spend, and he can spend as much time as he likes on his leisure pursuits. Windsurfing equipment rents for $10 an hour, and snorkeling equipment rents for $5 an hour. If Max equalizes the marginal utility per hour from windsurfing and from snorkeling, he Select one: A. maximizes his marginal utility per dollar. B. can increase his total utility by spending more time windsurfing and less time snorkeling. C. maximizes his total utility. D. can increase his total utility by spending less time windsurfing and more time snorkeling. E. can increase his total utility only if the price of windsurfing equipment rentals decreases.

Answers

Max has $35 a day to spend, and he can spend as much time as he likes on his leisure pursuits. Windsurfing equipment rents for $10 an hour, and snorkeling equipment rents for $5 an hour.

If Max equalizes the marginal utility per hour from windsurfing and from snorkeling, he can increase his total utility by spending less time windsurfing and more time snorkeling. The concept of total utility is based on the entire quantity of products consumed. On the other hand, the marginal utility is dependent on the unit quantity of a commodity consumed. Hence, the relationship between total utility and marginal utility is as follows: Marginal utility refers to the extra satisfaction generated from the consumption of the last unit of the product, whereas total utility refers to the total satisfaction derived from the consumption of all the goods.

According to the given information, Windsurfing equipment costs $10 per hour, and snorkeling equipment costs $5 per hour. Max's budget is $35, and he may devote as much time as he wants to his leisure activities. If Max balances the marginal utility per hour of windsurfing and snorkeling, he can increase his total utility by spending less time windsurfing and more time snorkeling, which is answer (D) can increase his total utility by spending less time windsurfing and more time snorkeling.

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Find the indefinite integral. (Use C for the constant of integration. ∫x (1-7x²)⁶ dx

Answers

The indefinite integral of ∫x(1-7x²)⁶ dx is given by: (1/2)x² - 6(7/4)x⁴ + 15(7/5)x⁵ - 20(7/6)x⁶ + 15(7/7)x⁷ - 6(7/8)x⁸ + (7/9)x⁹ + C, where C is the constant of integration.

To find the indefinite integral of ∫x(1-7x²)⁶ dx, we can use the power rule of integration and apply it repeatedly. By expanding the binomial (1-7x²)⁶ and integrating each term, we can find the antiderivative of the given function.

To find the indefinite integral of ∫x(1-7x²)⁶ dx, we can use the power rule and the constant multiple rule of integration.

Let's start by expanding the expression (1-7x²)⁶ using the binomial theorem:

(1-7x²)⁶ = 1 - 6(7x²) + 15(7x²)² - 20(7x²)³ + 15(7x²)⁴ - 6(7x²)⁵ + (7x²)⁶

Now, we can integrate each term of the expanded expression using the power rule and the constant multiple rule. The integral of xⁿ with respect to x is given by (x^(n+1))/(n+1):

∫x(1-7x²)⁶ dx

= ∫(x - 6(7x³) + 15(7x⁴) - 20(7x⁵) + 15(7x⁶) - 6(7x⁷) + (7x⁸)) dx

= ∫x dx - 6∫(7x³) dx + 15∫(7x⁴) dx - 20∫(7x⁵) dx + 15∫(7x⁶) dx - 6∫(7x⁷) dx + ∫(7x⁸) dx

= (1/2)x² - 6(7/4)x⁴ + 15(7/5)x⁵ - 20(7/6)x⁶ + 15(7/7)x⁷ - 6(7/8)x⁸ + (7/9)x⁹ + C

Therefore, the indefinite integral of ∫x(1-7x²)⁶ dx is given by:

(1/2)x² - 6(7/4)x⁴ + 15(7/5)x⁵ - 20(7/6)x⁶ + 15(7/7)x⁷ - 6(7/8)x⁸ + (7/9)x⁹ + C, where C is the constant of integration.

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The lines that mark the width of each parking space are parallel.
Which of the following statements is a valid justification of the correct value of x?

a
If a transversal intersects two parallel lines, then same-side interior angles are congruent. Therefore, x = 65.
b
If a transversal intersects two parallel lines, then alternate exterior angles are supplementary. Therefore, x = 115.
c
If a transversal intersects two parallel lines, then corresponding angles are congruent. Therefore, x = 65.
d
If a transversal intersects two parallel lines, then same-side exterior angles are supplementary. Therefore, x = 115.

Answers

X = 65" is incorrect. Same-side interior angles are formed when two parallel lines are cut by a transversal and are defined as the pairs of angles that are on the same side of the transversal and on the inside of the parallel lines. These angles are supplementary, meaning that they add up to 180 degrees.

The problem given is about determining the value of x given that the lines that mark the width of each parking space are parallel. To solve this problem, we need to understand the relationship between angles formed by transversal lines crossing a pair of parallel lines. It is known that when a transversal crosses two parallel lines, it creates eight angles.

The statement "If a transversal intersects two parallel lines, then corresponding angles are congruent" is a valid justification of the correct value of x in this situation.

Corresponding angles are formed when two parallel lines are cut by a transversal and are defined as the pairs of angles that are in the same position on each line. In other words, the angles that correspond to each other.

They are equal in measure, meaning that if one angle is x degrees, the corresponding angle is also x degrees.

In this problem, we can see that angle 1 is corresponding with angle 3, and so they must have equal measure. Thus, x = 65 degrees.

Hence, the correct option is (c) If a transversal intersects two parallel lines, then corresponding angles are congruent.

Therefore, x = 65. As such, the statement "If a transversal intersects two parallel lines, then same-side interior angles are congruent.

Therefore, x can not equal 65 degrees. Same-side exterior angles are also supplementary and do not add up to 65 degrees.

Similarly, alternate exterior angles are also not equal to 65 degrees, but they are supplementary and add up to 180 degrees. The correct answer is the corresponding angles, and the corresponding angles are congruent.

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Let y(x) be the solution to the following initial value problem. dxdy​=xy2(lnx)6​,y(1)=3 Find y(e).

Answers

To find y(e), the value of the solution y(x) at x = e, we need to solve the given initial value problem. The given differential equation is dx/dy = x*y^2*(ln(x))^6 with the initial condition y(1) = 3. Let's separate the variables and integrate both sides of the equation: dy/y^2 = (ln(x))^6*dx/x.

Integrating, we have:

∫(dy/y^2) = ∫((ln(x))^6*dx/x).

The integral on the left side can be evaluated as:

∫(dy/y^2) = -1/y.

For the integral on the right side, we can substitute u = ln(x) and du = (1/x)dx, which gives:

∫((ln(x))^6*dx/x) = ∫(u^6*du).

Integrating, we obtain:

∫(u^6*du) = u^7/7 + C1,

where C1 is the constant of integration.

Now, substituting the original variable back in, we have:

-1/y = ln(x)^7/7 + C1.

Rearranging, we find:

y = -1/(ln(x)^7/7 + C1).

To determine the value of the constant C1, we can use the initial condition y(1) = 3. Plugging in x = 1 and y = 3 into the equation above, we get:

3 = -1/(ln(1)^7/7 + C1).

Since ln(1) = 0, the equation simplifies to:

3 = -1/(0^7/7 + C1)

  = -1/(C1 + 1).

Solving for C1, we have:

C1 + 1 = -1/3

C1 = -4/3.

Now, we can rewrite the equation for y(x):

y = -1/(ln(x)^7/7 - 4/3).

To find y(e), we substitute x = e into the equation:

y(e) = -1/(ln(e)^7/7 - 4/3)

    = -1/(1^7/7 - 4/3)

    = -1/(1 - 4/3)

    = -1/(-1/3)

    = 3.

Therefore, y(e) = 3.

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in words explain how to determine the y intercepts of a rational function. be sure to include if theres a specific way to easily find the y intercept and the possible number of y intercepts

Answers

Answer:

evaluate f(0)there will be 0 y-intercepts if f(0) is undefined, 1 otherwise.

Step-by-step explanation:

You want to know how to determine the y-intercepts of a rational function, and their possible number.

Rational function

A rational function f(x) is the ratio of two polynomial functions p(x) and q(x):

  f(x) = p(x)/q(x)

As such, both numerator and denominator have single function values for any value of the independent variable. The y-intercept of f(x) is ...

  f(0) = p(0)/q(0)

The values of p(0) and q(0) are simply the constant terms in those respective functions.

The simple way to find the y-intercept is to look at the ratio of the constant terms in the polynomial functions making up the rational function. If that is defined, there is one y-intercept. If it is undefined (q(0)=0), then there are no y-intercepts.

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How do you describe the end behavior of the function f(z)--2(2-4)2 +3?
Enter your answer by filling in the boxes.
As →→∞0, f (x) →
As →∞o, f(x)→

Please helllp

Answers

As x approaches positive infinity (∞), the function f(x) approaches a negative infinity (-∞).

To determine this value, we need to simplify the given function and analyze its behaviour. Given the function[tex]f(x) = -2(2-4x)^2 + 3[/tex] we can simplify it as follows:[tex]f(x) = -2(4x^2 - 16x + 16) + 3[/tex]

f(x) =[tex]-8x^2 + 32x - 32 + 3[/tex]

f(x) =[tex]-8x^2 + 32x - 29[/tex]

Now, as x approaches positive infinity (∞), we can observe the behaviour of the leading term[tex](-8x^2)[/tex] of the function. Since the coefficient of [tex]x^2[/tex]is negative (-8), the function will tend to negative infinity as x approaches positive infinity (∞). Therefore, as x approaches positive infinity (∞), f(x) approaches negative infinity (-∞). In mathematical notation, we can express the end behavior of the function as: As x → ∞, f(x) → -∞

Hence, as x approaches positive infinity (∞), we will observe that the function f(x) approaches negative infinity (-∞).

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Matlab problem: Generate a sequence of 100 random bits with probability Pr[X=1]=p= 0.2. a) What are the lengths of runs of 0 's punctuated by a 1 ? (Ignore any final sequence of 0 's that is not ended by a 1.) b) Compute the average run length observed and compare to the expected

Answers

Generate a 100-bit random sequence in Matlab using rand(1, 100) and X(r < p). Calculate 0s run lengths and compare expected lengths using the formula (1 - p)/p. Observe average run lengths for unbiased or biased sequences.Therefore, the expected length of runs of 0s in this case is (1 - 0.2)/0.2 = 4.

To generate a sequence of 100 random bits with probability Pr[X=1] = p = 0.2 in Matlab, the following commands can be used:

r = rand(1, 100); X = (r < p);a) The lengths of runs of 0s punctuated by a 1 can be calculated by using the following code:idx = find(diff([0 X 0]) == -1) - find(diff([0 X 0]) == 1);

b) The average run length observed can be calculated by using the following code:mean(idx)To compare the expected length, we can use the formula for the expected length of runs of 0s, which is given by

(1 - p)/p. Therefore, the expected length of runs of 0s in this case is

(1 - 0.2)/0.2

= 4.

The observed average run length can be compared to the expected length to check if they are similar or different. If the observed average run length is close to the expected length, then the sequence is random and unbiased. If the observed average run length is significantly different from the expected length, then the sequence is biased and not random.

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The company has decided to allocate the cost of the Animal Welfare department to the production departments based on the actual costs of the Animal Welfare department (as opposed to the budgeted costs of the Animal Welfare department). As manager of the Feeder Testing department you are very upset about this. Give two reasons you are not happy about the company's decision to allocate the support department costs using actual costs rather than budgeted costs. Compare and Contrast how the strategic fit of target markets affects the demand in 9 region(s) or trading areas? What of operating costs, how do they affect retail businesses in their trading areas or locations? Cite examples in your analysis. Discuss the different types of project stakeholders? Support your answer with an example of stakeholders of IT project at XYZ university? Consider the chemical equation. 2NBr3 + 3NaOH Right arrow. N2 + 3NaBr + 3HOBrIf there are 40 mol of NBr3 and 48 mol of NaOH, what is the excess reactant? N2NBr3NaOHHOBr "Synergistic effect" of two toxic substances is their toxicity together is more than the sum of their toxicity when on their own their toxicity together is less than the sum of their toxicity when on their own their toxicity together is the sum of their toxicity when on their own none of the other answers what factors control how minerals weather? contrast divided consciousness theory and the social influence theory of hypnosis 2. explain what circadian rhythm is and how it can affect sleep. Pick a publicly-traded company and examine the company products. If the company produces many products, please pick one important product and explain why and how it is important for management to understand cost-volume-profit relationships. CANNOT USE APPLE, or DOMINOS PIZZA. Written Problem 1: Morris Company, a small manufacturing firm, wants to acquire a new machine that costs $30,000. Arrangements can be made to lease or purchase the machine. The firm is in the 40% tax bracket. The firm has gathered the following information about the two alternatives: Lease: Morris would obtain a five-year lease requiring annual end-of-year lease payments of $10,000. The lessor would pay all maintenance costs; insurance and other costs would be borne by the lessee. Morris would be given the right to exercise its option to purchase for $3,000 at the end of the lease term Purchase: Morris can finance the purchase of the machine with an 8.5% five-year loan requiring annual end-of -year installment payments. The machine would be depreciated under MACRS using a five-year recovery period. The exact depreciation rates over the next six periods would be 20%, 32%, 19%, 12%, 12% and 5% respectively. Morris would pay $1200 per year for a service contract that covers all maintenance costs. The firm plans to keep the machine and use it beyond its five-year recovery period. a. Calculate the after-tax cash outflow from the lease for Morris Company. Show your work. b. Calculate the annual loan payment. Show your work. c. Determine the interest and principal components of the loan payments. Show your work. d. Calculate the after-tax cash outflows associated with the purchasing option. Show your work. e. Calculate and compare the present values of the cash outflows associated with both the leasing and purchasing options. Show your work. f. Which alternative is preferable? Explain