The half-life of the substance is 1.94 years.
What is exponential decay formula?The exponential decay formula aids in determining the exponential drop, which is a rapid reduction over time. To calculate population decay, half-life, radioactivity decay, and other phenomena, one uses the exponential decay formula. F(x) = a [tex](1-r)^{x}[/tex] is the general form.
Here
a = the initial amount of substance
1-r is the decay rate
x = time span
The correct form of the equation is given as:
[tex]a=a_{0}[/tex]×[tex](0.7)^{t}[/tex]
where t is an exponent of 0.7 since this is an exponential decay of 1st order reaction
Now to solve for the half life, this is the time t in which the amount left is half of the original amount, therefore that is when:
a = 0.5 a0
Substituting this into the equation:
0.5 [tex]a_{0}=a_{0}[/tex]×[tex](0.7)^{t}[/tex]
0.5 = [tex](0.7)^{t}[/tex]
Taking the log of both sides:
t log 0.7 = log 0.5
t = log 0.5 / log 0.7
t = 1.94 years
The half life of the substance is 1.94 years.
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The function f(x) = –Two-sevenths (five-thirds)x is reflected over the y-axis to create g(x). Which points represent ordered pairs on g(x)? Check all that apply.
The values of the function if the function f(x) is reflected over y-axis is g(x) = 10/21x
Reflection of coordinatesReflection is a transformation technique that changes the position of an object on an xy-plane.
If the function f(x) is reflected over y-axis, the resulting function is y = f(-x). Given the following function;
f(x) = -2/7(5/3)x
This can also be written as;
f(x) = -10/21 x
Replace x as -x
f(-x) = -10/21(-x)
f(-x) = g(x) = 10/21x
Hence the values of the function if the function f(x) is reflected over y-axis is g(x) = 10/21x
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catherin worked 23 hours last week babysitting. She earned 126.50. What is her rate of pay?
Answer:5.50 a hour
Step-by-step explanation:
Find the net outward flux of f=a×r across any smooth closed surface in r3, where a is a constant nonzero vector and r=〈x,y,z〉
Flux is zero since asked in [tex]\pi[/tex] is [tex]0\pi[/tex].
Flux is the presence of a pressure field in a detailed physical medium or the glide of electricity through a surface. In electronics, the term applies to any electrostatic field and any magnetic subject. Flux is depicted as "traces" in a plane that contains or intersects electric powered fee poles or magnetic poles.
The definition of flux is a flow of liquid from the body, or a regular movement or exchange. An instance of flux is diarrhea. An example of flux is an ever-converting list of the responsibilities of a particular process. regular or frequent alternate; fluctuation.
Flux is a go-platform computer program that adjusts a show's color temperature in keeping with vicinity and time of day, offering practical respite for the eyes. the program is designed to reduce eye stress at some stage in night-time use, supporting reducing the disruption of sleep patterns.
Our field is IR^3 be,
F= (bz-cy,cx-az,ay-bx)
Now divergence theorem says that Flux can be calculated by
[tex]\int\limits^ {} \, F.n = \int\limits^ {} \,( c.F) dv[/tex]
Now let's calculate the divergence of a vector field
F = (ia/ax + ja/ay + k*a/az)*((bz-cy)i+((x-dz))+(ay-bx)*k)
a/ax(bz-cy)+a/ay(cx-az)+a/az(ay-bx)
= 0+0+0
=0
Flux is zero since asked in [tex]\pi[/tex] is [tex]0\pi[/tex].
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A company did a quality check on all the packs of trail mix it manufactured. each pack of trail mix is targeted to weigh 9.25 oz. a pack must weigh within 0.23 oz of the target weight to be accepted. what is the range of rejected masses, ×, for the manufactured trail mixes? (1 point) 0 x<9.02 or x> 9.48 because lx - 9.251 > 0.23 o x<9.25 or x > 9,48 because ix - 0.231 9.25 > 0 0 x€ 9.02 or x> 9.48 because ix - 0.231 9.25 > 0 o x< 9.25 or x> 9.48 because ix - 9.25| > 0.23
Rejected masses x are those that weigh less than 9.02 oz or more than 9.48 oz.
What is the range?In mathematics, the range of a function can refer to one of two notions that are closely related.The function's codomain, the function's visual representation.A binary relation f between two sets X and Y is a function if for every x in X there is exactly one y in Y such that f relates x to y.To find the rejected masses:
If each pack of trail mixes is supposed to weigh 9.25 oz and must be within 0.23 oz of that weight to be accepted, then rejected masses x are those that weigh less than 9.02 oz or more than 9.48 oz.Therefore, rejected masses x are those that weigh less than 9.02 oz or more than 9.48 oz.
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The correct question is given below:
A company did a quality check on all the packs of trail mix it manufactured. each pack of trail mix is targeted to weigh 9.25 oz. a pack must weigh within 0.23 oz of the target weight to be accepted. what is the range of rejected masses, ×, for the manufactured trail mixes?
20. A trader took a loan of 1,800.00 at an interest of 12 percent per annum. It was agreed that the loan and the interest must be paid in one year equal monthly instalments.
a) Calculate
i) the interest on the loan.
ii) the amount to be paid at the end of the year.
iii) the monthly instalment.
b) Another trader took a loan at the same rate interest and conditions. If she had to pay $200.00 monthly instalment, find to the nearest cedi, how much she took.
Step-by-step explanation:
i)I=PRT/100
I=1800*12*1/100
I=$216
ii) amount to be paid =1800+216
=$2016
iii) monthly installments=2016/12
=$168
b)I=PRT/100
I=
If a trader took a loan of 1,800.00 at an interest of 12 percent per annum
a. Interest on the loan is $216.
Amount to be paid at the end of the year is $2016
Monthly Installment is $168
b. She took $2184 to the nearest dollar.
What is the Interest?a) i) Interest on the loan:
Interest = Principal × Rate × Time
Interest = $1800 × 0.12 × 1
Interest = $216
ii) Amount to be paid at the end of the year:
Amount = Principal + Interest
Amount = $1800 + $216
Amount = $2016
iii) Monthly installment:
Number of monthly installments = 12
Monthly Installment = Total Amount / Number of Installments
Monthly Installment = $2016 / 12
Monthly Installment ≈ $168
b) Let's X represent the amount she took
Total Payment = Monthly Installment × Number of Months
Total Payment = $200 × 12
Total Payment = $2400
So
Total Payment = X + $216
$2400 = X + $216
Subtract $216 from both sides:
$2400 - $216 = X
$2184 = X
Therefore she took approximately $2184 to the nearest dollar.
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Time Remaining
59:15
A kite is inscribed within a square with a side lengths of 9 units.
A kite is inscribed in a square with a side length of 9 units.
What is the area of the kite?
27.5 square units
36.0 square units
40.5 square units
45.0 square units
Answer:
(c) 40.5 square units
Step-by-step explanation:
Assuming the kite is oriented so its diagonals are parallel to the sides of the square, each diagonal is 9 units long. The area of the kite is given by an appropriate formula.
What is a kite?A kite is a parallelogram with two pairs of adjacent congruent sides. Its diagonals meet at right angles. One diagonal bisects the other.
Kite areaThe formula for the area of a kite is ...
A = 1/2(d1)(d2) . . . . . where d1 and d2 are the lengths of the diagonals
In this problem, the inscribed kite has congruent diagonals, both of length 9 units.
The area of the kite is ...
A = 1/2(9)(9) = 81/2 = 40.5 . . . . square units
PLSSS HELP ASAP!! ty
On a graph, sketch f(x)=x+3 and g(x)=x. Is there a way of determining the graph of f(x)+g(x) without solving it algebraically? Explain your thinking below.
From the graph, the equation of f(x) + g(x) is f(x) + g(x) = 2x + 3
How to determine the graph of f(x) + g(x)?The functions are given as:
f(x) = x + 3
g(x) = x
From the above functions, we can see that the function g(x) is the parent function of a linear function.
When the parent function of a linear function is added to another function to form a composite function, the new function would pass through the following points
(x, y)= (0, b) and (-b, -b)
Where b is the y-intercept of the other function
i.e b = 3 from f(x) = x + 3
So, we have the following points
(0, 3) and (-3, -3)
Next, we draw the points and we connect the points
When the equation of f(x) + g(x) is calculated, we have
f(x) + g(x) = 2x + 3
See attachment for the graph of the functions
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can someone please help mee ( will give brainliest 20 points!!!)
The piecewise function graphed below is given as follows:
[tex]f(x) = 3, -4 \leq x \leq -2[/tex][tex]f(x) = x + 2, -2 < x \leq 3[/tex][tex]f(x) = -1, 3 < x \leq 5[/tex]What is a piecewise function?A piecewise function is a function that has different definitions, depending on the input.
For x between -4 and -2, inclusive, the function is constant at 3, hence the definition is:
[tex]f(x) = 3, -4 \leq x \leq -2[/tex]
For x greater than -2 until 3, the function is a line with slope 1 and y-intercept 2, hence the definiton is:
[tex]f(x) = x + 2, -2 < x \leq 3[/tex]
For x greater than 3 until 5, the function is constant at -1, hence the definition is:
[tex]f(x) = -1, 3 < x \leq 5[/tex]
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Select the correct answer what are the solutions to this quadratic equation 4x^2-10=10-20x
Answer:
x1 = 5-3squareroot 5/2 x2= -5+3 squareroot 5 / 2
Step-by-step explanation:
How many 5-digit numbers can be created
using the digits 2, 3, 5, 7, and 8 without
repeating any digits within that 5-digit
number?
Answer:
120.
Step-by-step explanation:
That would be factorial 5, written 5!.
That is 5*4*3*2*1
= 120.
Answer:
120
Step-by-step explanation:
We have 5 digits that can be used to create different 5 digit numbers. We are also not allowed to repeat any numbers. Let's say we have 5 boxes to put the 5 numbers in.
Box 1
Box 2
Box 3
Box 4
Box 5
In the first box, we have 5 different choices. Since we aren't allowed to repeat any digits, the second box only has 4 different choices. And so on...
Box 1 --> 5 choices
Box 2 --> 4 choices
Box 3 --> 3 choices
Box 4 --> 2 choices
Box 5 --> 1 choice
Therefore the amount of 5 digit numbers that can be created is:
[tex]5\times4\times3\times2\times1[/tex] or 5 factorial (a factorial is all the product of all the positive integers equal to and less than the number), which is equivalent to:
120 5-digit numbers
1.** Mr. Jokinen is complaining about his heavy backpack. He removed a few books which decreased the weight of his backpack by 20%, but it still weighs 20 pounds. How much did his backpack weigh before he removed the books?
Answer: 25 pounds
Step-by-step explanation: 100% - 20% = 80%
20 divided by 80% = 25
Rick runs 5 miles which burns approximately 500 calories. how many miles would rick have to run to burn one pound of adipose tissue?
35miles Rick have to run to burn one pound of adipose tissue.
According to the given question.
Rick runs 5miles to burn 500 calories.
⇒ 1 mile burns the amount of calories = 500/5 = 100 calories.
As we know that
1 pound = 3,500 calories.
So the number of miles Rick needed to run to burn 1 pound of adipose tissue = 3500/100 = 35miles
Hence, 35miles Rick have to run to burn one pound of adipose tissue.
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The equation y = 1000x - 5000 represents the monthly profits of a start-up dry cleaning company. Time in months is x and profit in dollars is y. The first date of operation is when time is zero. However, preparation for opening the business began 3 months earlier with the purchase of equipment and supplies. Graph the linear function for x-values from -3 to 8
The attached graph represents the graph of the linear equation y = 1000x - 5000 on a scale of 1 to 1000 units on both axes
What are linear equations?Linear equations are equations that have constant average rates of change, slope or gradient
How to graph the linear function?The equation of the linear function is given as:
y = 1000x - 5000
The x values are given as:
x = -3 to 8
This means that the domain of the function is [-3, 8] or -3 <= x <= 8
So, we set x = -3 and x = 8, and we calculate the y values.
So, we have:
y = 1000 * -3 - 5000 = -8000
y = 1000 * 8 - 5000 = 3000
So, we draw two points at (-3, -8000) and (8, 3000) and connect the dots
See attachment for the graph of the function
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HELP HELP PLEASEEE
Theo has 2.5k followers. He knows that if he posts daily, he will gain 1k followers each day.
In this scenario, identify the initial value and rate of change. Then, explain why this is or is not
proportional and/or a linear relationship.
Perfect pizza has 16 toppings listed on their menu. how many ways could a customer choose a pizza that contains 5 different toppings?
Answer:
4368 ways
Step-by-step explanation:
Use nCk for this. 16C5. This is [tex]\frac{n!}{(n-k)!(k!)}[/tex]. This becomes[tex]\frac{16!}{(11!)(5!)}[/tex]. This is [tex]\frac{16*15*14*13*12}{5*4*3*2*1}[/tex] due to 16! and 5! canceling out. This becomes 4368.
If Hiawatha held his bow 1.5 m off the ground and shot the arrow at a 45° angle with an initial velocity of 40 m/s, then the arrow’s height (in meters) off the ground can be modeled by the equation h(t)=−9.8t2+28t+1.5.
The arrow hits the top of a 3 meters tall wigwam at 0.054 seconds
How to determine the time to reach 3 meters?The complete question is added as an attachment
The function is given as:
[tex]h(t) = -9.8t^2 + 28t + 1.5[/tex]
Set the height to 3
[tex]-9.8t^2 + 28t + 1.5 = 3[/tex]
Subtract 3 from both sides
[tex]-9.8t^2 + 28t - 1.5 = 0[/tex]
Apply the following quadratic formula
[tex]t = \frac{-b \pm \sqrt{b^2- 4ac}}{2a}[/tex]
So, we have:
[tex]t = \frac{-28 \pm \sqrt{28^2- 4*-9.8*-1.5}}{2*-9.8}[/tex]
This gives
[tex]t = \frac{-28 \pm \sqrt{725.2}}{-19.6}[/tex]
This gives
[tex]t = \frac{-28 \pm 26.93}{-19.6}[/tex]
Expand
[tex]t = \frac{-28 + 26.93}{-19.6}[/tex] and [tex]t = \frac{-28 - 26.93}{-19.6}[/tex]
This gives
t = 0.054 and t = 2.80
0.054 is less than 2.80
This means that the arrow hits the top of a 3 meter tall wigwam at 0.054 seconds
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whats the surface area of the rectangular prism
The surface area of the rectangular prism is 2(lw + wh + lh). A rectangular prism has six rectangular faces.
What is the area of a rectangle?The area of a rectangle with length and width is
Area = length × width
I.e., A = l × w sq. units
How to calculate the area of the rectangular prism?A rectangular prism has six rectangular faces and the length 'l', width 'w', and height 'h'.
So, the areas of each face are as follows:
A(R1) = l × w
A(R2) = l × h
A(R3) = w × h
A(R4) = l × w
A(R5) = l × h
A(R6) = w × h
Thus, the area of the prism = sum of areas of all the faces
⇒ Area of the prism = lw + lh + wh + lw + lh + wh
⇒ A = 2lw + 2lh + 2wh
⇒ A = 2(lw + lh + wh)
Therefore, the area of the rectangular prism is A = 2(lw + lh + wh).
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Find the midpoint of the line segment joining points A and B.
A(6-7); B(4,3)
Answer: [tex]\Large\boxed{Midpoint=(5,~-2 )}[/tex]
Step-by-step explanation:
Given information
[tex](x_1,~y_1)=(6,~-7)[/tex]
[tex](x_2,~y_2)=(4,~3)[/tex]
Given the midpoint formula
[tex]Midpoint=(\dfrac{x_1+x_2}{2} ,~\dfrac{y_1+y_2}{2} )[/tex]
Substitute values into the given formula
[tex]Midpoint=(\dfrac{(6)+(4)}{2} ,~\dfrac{(-7)+(3)}{2} )[/tex]
Simplify values on the numerator
[tex]Midpoint=(\dfrac{10}{2} ,~\dfrac{-4}{2} )[/tex]
Simplify the fractions
[tex]\Large\boxed{Midpoint=(5,~-2 )}[/tex]
Hope this helps!! :)
Please let me know if you have any questions
To eliminate the y terms and solve for x in the fewest steps, by which constants should the equations be multiplied by before adding the equations together?
First equation: 4x − 3y = 34
Second equation: 3x + 2y = 17
Answer:
Multiply both sides of the first equation by 2.
Multiply both sides of the second equation by 3.
Step-by-step explanation:
The y terms are
-3y
2y
The LCM of 2 and 3 is 6.
We need the y terms to add to zero.
Multiply both sides of the first equation by 2 to get -6y.
Multiply both sides of the second equation by 3 to get 6y.
Then -6y + 6y = 0 eliminating the y terms after adding the equations.
What are angles <3 and <4 ?alternate interior angles
alternate exterior angles
vertical angles
corresponding angles
Solve the equation in the image (yr 8 maths, 50pts)
Answer: x = 4
Step-by-step explanation:
Given equation
4x - 20 = -x
Add x on both sides
4x - 20 + x = -x + x
5x - 20 = 0
Add 20 on both sides
5x - 20 + 20 = 0 + 20
5x = 20
Divide 5 on both sides
5x / 5 = 20 / 5
[tex]\Large\boxed{x=4}[/tex]
Hope this helps!! :)
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Geometry: complete this proof (ASAP!!! It’s urgent)
Answer:
1. BD bisects <CBE, AE || BD (Given)
2. <EBD ~= <CBD (Definition of < Bisectors)
3. <AEB ~= <EBD (Alternate Interior Angles Theorem)
4. <CAE ~= <CBD (Corresponding Angles Postulate)
5. <CAE ~= <AEB (Transitive Property of Congruence)
6. AB ~= BE (Converse of Isosceles Triangles Theorem)
From the diagram below, we can tell that ___.
Answer: b. the two triangles are similar by SAS
Step-by-step explanation:
These two triangles (ABC and ADE) both share angle A. This means that one angle is congruent.
Next, we will look at the sides. Triangle ADE has side lengths of 6, 9, and x. Triangle ABC has side lengths of 8+6, 12+9, y. Let us see how these side lengths compare.
[tex]\frac{8+6}{12+9} =\frac{14}{21} =0.6666[/tex]
[tex]\frac{6}{9} = 0.6666[/tex]
THey are similar. This means the triangles can be prooven similar with SAS.
A jar contains 5 orange marbles, 3 black marbles, and 6 brown marbles. event a = drawing a brown marble on the first draw event b = drawing an orange marble on the second draw if two marbles are drawn from the jar, one after the other and not replaced, what is p(b|a) expressed in simplest form?
The probability of event A and event B IS 15/91.
What is the probability?
Probability determines the odds that a random event would occur. The odds lie between 0 and 1.
The probability of event A = number of brown marbles / total number of marbles
= 6/14
The probability of event B = number of orange marbles / total number of marbles -1
= 5/13
P(A and B) =6/14 x 5/13
= 30/182
= 15/91
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Answer:
B.) 5/13
Step-by-step explanation:
15/3=5
91/7=13
5/13
BRAINEST IS VERYYYY APPRECATED
please give the answer
Step-by-step explanation:
f(a):
So for this you simply plug in "a" as x, and this doesn't really do anything beside replace all values with x, so you just have the equation:
[tex]f(a) = 5a+4[/tex]
2 f(a):
So for this one, you want to represent f(a) using the equation it's equal to (5a + 4), and substitute it in for f(a). In doing so, you get the expression:
2*f(a) -> 2(5a + 4) -> 10a + 8
f(2a):
So this is very similar to the first question, although you will have to do some multiplication. So just plug in 2a as "x" to get the equation:
[tex]f(2a) = 5(2a) + 4 = 10a+4[/tex]
f(a+2):
Basically the same process, you plug in (a+2) as "x" and simplify:
[tex]f(a+2) = 5(a+2) + 4\\f(a+2) = 10a+10+4\\f(a+2) = 10a+14[/tex]
f(a) + f(2):
This is similar to the second question, and you simply want to replace the f(a) with the equation that represents it (5a + 4) and same thing for f(2) = 5(2) + 4
[tex]f(a) + f(2) = (5a+4)+(5(2)+4) \\f(a) + f(2) = (5a+4)+(10+4)\\f(a)+f(2) = (5a+4) + (14)\\f(a) + f(2) = 5a+18[/tex]
Area=
Help me please!! Thanks so much-needed
First you have to figure out the side length of the triangle.
sin(60)= X/8
Let's call x the side length.
8 sin(60)=X
X=6.93
The multiply it by 4
The area is 27.72
100 points to whoever can answer this!
Answer:
10724.29
Step-by-step explanation:
mean means average
so to find an average you add everything together then divide it by the amount of variables
m = (10150 + 10211 + 10424 + 10769 + 10884 + 11155 + 11477)/7
m = 75070/7
m = 10724.2857143
m = 10724.29
When a number increases by 10 % it become 22, Find the number.
Marissa is painting her rectangular patio, with the exception of a bench that does not need to be painted: rectangle with a length of x plus 25 and width of x plus 15 with a rectangle in the bottom right corner labeled bench that has a length of 10 and width of 3 write an equation to determine the area, a, of the patio that will be painted. a = (x 18)(x 35) a = (x 15)(x 25) 30 a = (x 5)(x 22) a = (x 25)(x 15) − 30
The correct option is D.
An equation to determine the area, a, of the patio that will be painted :
a = (x + 25)(x + 15) - 30
What is Geometrical figure?Geometric shapes are the mathematical figures that show how ordinary objects in our world are shaped. Shapes in geometry are the configurations of things with boundary lines, angles, and surfaces.
According to the given Information:Length of the rectangular patio is (x+25).
Width of the rectangular patio is (x+15).
Length of bench is 5.
Width of the bench is 1.
Area of rectangle:Area of a rectangle is:
A = Length x Width
Area of rectangular patio is:
A[tex]_1[/tex] = (x + 25)(x + 15)
Area of bench is:
A[tex]_2[/tex] = 10 x 3
= 30
The painting area is:
A = A[tex]_1[/tex] - A[tex]_2[/tex]
A = (x + 25)(x + 15) - 30
Therefore, the correct option is D.
An equation to determine the area, a, of the patio that will be painted :
a = (x + 25)(x + 15) - 30
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what expression is equivalent to 6+3(n-4)-8+2n
Answer:
Step-by-step explanation:
Comment
Begin by removing the brackets.
6+3(n-4)-8+2n
6 + 3n - 12 - 8 + 2n Collect like terms
3n + 2n + 6 - 12 - 8 Combine
5n - 14
Answer
5n - 14