what is a real world example of a rational function, and how could you graph it and put it in a table?

Answers

Answer 1

An example of the real world example of a rational function would be when a person would decide to share a cookie with their friend. Each of them would get half of the cookie each.

What is a rational function?

This is the term that is used to refer to the fraction that is represented by the use of a rational fraction. That is there is denominator and a numerator.

The denominator must have a variable and this variable has to be of degree 1. Hence the real world example of a rational function would be when a person would decide to share a cookie with their friend. Each of them would get half of the cookie each.

How to graph a real world situation

First you have to know if it is an inequality or not. Then you have to assign x and y variables to numbers. From here you form an equation. This equation is plotted on a graph.

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Related Questions


Given below are lease terms at the local dealership. What is the total cash
due at signing?

Answers

Based on the various costs resulting from the lease terms at the local dealership, the total cash to pay at signing is $5,480

What is the total cash?

This can be found by the formula:

= Down payment + Monthly payment + Security deposit + Acquisition fee

Solving gives:

= 4,100 + 475 + 415 + 490

= $5,480

In conclusion, option A is correct.

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Answer: B. $5005

Step-by-step explanation:

Lois made a dish with61/3 cups of pasta. One serving of the pasta is 0.2 cups. How many servings of pasta were in the dish Lois made?
A.


B.


C.


D.

Answers

The number of servings of pasta were in the dish Lois made is 31.67.

Unit value

Number of cups of pasta Lois made = 6 1/3 cups

A serving of the pasta = 0.2 cups

Number of servings of pasta were in the dish Lois made = Number of cups of pasta Lois made / A serving of the pasta

= 6 1/3 ÷ 0.2

= 19/3 ÷ 0.2

= 19/3 × 1/0.2

= (19×1) / (3 × 0.2)

= 19/0.6

= 31.6666666666666

Approximately,

Number of servings of pasta were in the dish Lois made is 31.67 servings

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What expression represents the volume of the prism, in cubic units? one-halfx3 one-halfx2 x 2x3 2x2 x

Answers

Volume of prism = [tex]\frac{1}{2x^{3} } + x^{2}[/tex]

Given that:

The oblique prism below has an isosceles right triangle base and the length of the base is x

=> the area of the base: [tex]\frac{1}{2}[/tex] × x × x = [tex]\frac{1}{2}[/tex]

The vertical height of the prism is (x + 2)

=> The volume of the oblique prism is:

                    V = the base area * the vertical height

<=> V = [tex]\frac{1}{2}[/tex] [tex]x^{2}[/tex] (x + 2)

<=> V =  [tex]\frac{1}{2x^{3} } + x^{2}[/tex]

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Lauren describes a parabola where the focus has a positive, nonzero x coordinate. Which parabola(s) could Lauren be describing? Check all that apply.
x2 = 4y
x2 = –6y
y2 = x
y2 = 10x
y2 = –3x
y2 = 5x

Answers

Parabolas could Lauren be describing are:

c) y2 = x

d) y2 = 10x

F)  y2 = 5x

What exactly is a parabolic curve?

The intersection of a cone with a plane that is parallel to the side of the cone results in the formation of a parabola, which is a symmetrical open plane curve. Under the influence of gravity, the route taken by a projectile takes the form of a curve similar to this one.

In the question that is presented to her, Lauren gives an example of a parabola that has a positive non-zero coordinate value on focus

Generally, the equation for focus is  mathematically given as

y=a(x-h)^2+k

In conclusion

c) y2 = xd) y2 = 10xF)  y2 = 5x

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A point P lies on the line with equation y= 4-3X. The point P is a distance √34 from the origin. Find the two possible positions Of point P

Answers

The two possible positions of point P are:

(3, -5) and (0.6, 5.8)

How to find the two possible positions of point P?

We know that point P lies on the line:

y = 4 - 3*x

And that the distance between P and the origin is √34, then if the coordinates of point P are (x, y), we have that:

[tex]\sqrt{34} = \sqrt{x^2 + y^2}[/tex]

Now, we can replace "y" in the distance equation by the linear equation, and also remove the square roots:

[tex]34 = x^2 + (4 - 3x)^2[/tex]

Now we can solve the quadratic equation for x:

[tex]34 = x^2 + 9x^2 + 16 - 24x\\\\10x^2 - 24x - 18 = 0\\\\[/tex]

The solutions are:

[tex]x = \frac{24 \pm \sqrt{(-24)^2 - 4*10*(-18)} }{2*10} \\\\x = \frac{24 \pm36}{20}[/tex]

So the two solutions are:

x = (24 + 36)/20 = 3

x = (24 - 36)/20 = -0.6

To get the points, we need to evaluate y on these values:

y = 4 - 3*3 = -5   So we have P = (3, -5)

y = 4 - 3*(-0.6) = 2.2 So we have the point (0.6, 5.8)

There are the two possible positions of point P.

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if a + b is equals to 5 and a x b is equal to 6 then what is the value of a and b​

Answers

Answer: 2 and 3, or 3 and 2

Step-by-step explanation:

a + b = 5 so a = 5 - b

Substitute a = 5 - b into ab = 6; (5 - b)b =  6

5b - [tex]b^{2}[/tex] = 6

[tex]b^{2}[/tex] - 5b + 6 = 0

(b - 2)(b - 3) = 0

So b is either 2 or 3

So a is either 3 or 2 depending on what b is

Which angle refers to the same angle as \angle BPF∠BPFangle, B, P, F?

Answers

A vertically opposite angle is a pair of angles formed due to the intersection of two lines, and are said to be equal. Thus the angle that is the same as <BPD is <APC.

ii. The value of x is [tex]47^{o}[/tex].

The intersection of two or more lines at a point will always produce a set of angles. Some of these angles when compared may have similar measures or properties.

Two angles can be equal with respect to their measure if they are vertically opposite. Vertically opposite angles are angles formed when two lines intersect, such that a pair of opposite angles about the point of intersection are equal.

Thus from the given question, the angle that is the same as <PBD is <APC.

i.e <BPD ≅ <APC (vertically opposite property)

Also,

x + 133 = 180 (sum of angles on a straight line)

x = 180 - 133

  = 47

x = [tex]47^{o}[/tex]

Therefore the value of x is [tex]47^{o}[/tex].

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5. (04.03 LC) Given a polynomial f(x), if (x + 5) is a factor, what else must be true? (6 points) O f(0) = 5 Of(0) = -5 O f(5) = 0 f(-5) = 0 6. (04.04 LC)​

Answers

If (x+5) is a factor of f(x) then the condition that will be true is f(-5)=0.

Given that (x+5) is a factor the polynomial f(x) and we are required to be the condition that will be true.

Polynomial is combination of algebraic terms may be in addition, subtraction, multiplication and division. If the highest power of variable in polynomial is one then it is said to be monomial ,If the highest power of variable in polynomial is two then it is said to be binomial,If the highest power of variable in polynomial is three then it is said to be trinomial and many more polynomials.

Factors are the numbers which when multiplied gives the number whose factors they are.

It is given that (x+5) is a factor of f(x).

Put (x+5)=0

x=-5

means when we are putting x=-5 then we will get 0.

Hence if (x+5) is a factor of f(x) then the condition that will be true is f(-5)=0.

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Find the length of CB.
5x – 3
3x + 1

Answers

Assumed that sides are equal

5x-3=3x+15x-3x=1+32x=4x=2

CB

5(2)-37

help help help help me please

Answers

186-42 = 144
Original price is 288 (5th option)
Equation is 0.5x + 42 = 186 (last option)


Please give brainliest I’d really appreciate it.

x2 + 6x - 7

Factor the following trinomials containing negative numbers. Follow the rules for operations with signed numbers to identify the correct binomial factors.

Answers

The factored form of the given trinomial is (x -7)(x +1)

Factoring the quadratics

From the question, we are to factor the given trinomials

The given trinomial is

x² + 6x - 7

The trinomial is a quadratic expression. The trinomial/ quadratic expression can be factored as a product of two binomial. When factored, the trinomial will take the form (x + a)(x + b)

Where are a and b are integers.

Factoring the trinomial

x² + 6x - 7

To factor the trinomial, we will find two numbers such that when added, we get the middle term; and when these numbers are multiplied we get the constant term.

The numbers that satisfy this condition are +1x and -7x

x² +x -7x - 7

x (x + 1) -7(x +1)

(x -7)(x +1)

Hence, the factored form of the given trinomial is (x -7)(x +1)

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Determine whether the given set of functions is linearly independent on the interval (−[infinity], [infinity]). f1(x) = x, f2(x) = x2, f3(x) = 6x − 2x2 linearly dependent linearly independent

Answers

The given set of functions are not linearly independent.

Given,

[tex]f_{1} (x) = x\\f_{2} (x) = x^{2} \\f_{3} (x) = 6x-2x^{2}[/tex]

We need,

[tex]c_{1} f_{1} (x)+c_{2} f_{2} (x)+c_{3} f_{3}(x)=0[/tex]

Substituting the values in equation we get,

[tex]c_{1} x+c_{2} x^{2} +c_{3} (6x-2x^{2} )=0\\[/tex]

Computing the equation we get,

[tex]c_{1} x+c_{2} x^{2} +c_{3} 6x-c_{3} 2x^{2}=0[/tex]

[tex](c_{1} +6c_{3} )x+(c_{2} -2c_{3} x^{2} =0[/tex]

This resolves to two equations

[tex](c_{1} +6c_{3})x =0\\(c_{2} -2c_{3} )x^{2} =0[/tex]

These will have an infinite set of solutions:

[tex]c_{1} =-6c_{3} \\c_{2} =2c_{3}[/tex]

Two functions are said to be linearly independent if neither function is a constant multiple of the other.

Here, it is clear that the given functions are not linearly independent.

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7x-x
simplify please

Answers

Based on the given task content; the simplification of 7x - x to its simplest form is 6x.

Simplification

Simplify 7x - x

There are two terms in the expression

The terms are;

7x and -x

The terms both have the same variable x

The term -x have an imaginary coefficient of 1

So,

7x - x

= 6x

Therefore, 6x is the result of the simplification of 7x - x to its simplest form.

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Anna wanted to buy a camera. The first discount store sold her favorite camera for $95. The second store sold the same camera for $115, but it was on sale for 20% off. The third store carried the camera for $105 but offered it at 10% off with a coupon. which store had the better buy?

Answers

The second store offered the better buy at the price of $92.00.

What is better buy?

Better buy refers to the lowest price out of the prices offered by the three stores.

In order to determine the lowest price, the no discount price of the first store needs to be compared to the prices of  two other stores, bearing that after-discount price is the pre-discount price multiplied by 1 minus the discount rate.

First store price=$95.00

Second store after-discount price=pre-tax discount price*(1-discount rate)

pre-discount price=$115

discount rate=20%

Second store after-discount price=$115*(1-20%)

Second store after-discount price=$92.00

Third store after-discount price=pre-tax discount price*(1-discount rate)

pre-discount price=$105

discount rate=10%

Third store after-discount price=$105*(1-10%)

Third store after-discount price=$94.50

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Thanks for the help in advance

Answers

Answer:

60

Step-by-step explanation:

Answer: 60

Step-by-step explanation:

5x-2y=10
4y+20=10x

Solving systemd

Answers

Answer:

The answer is x=2 and y=0.

Step-by-step explanation:

The given Equations are:

                    5x-2y=10      ----------------- (i)
                    4y+20=10x   ----------------- (ii)

From equation find the value of x, that is:

         5x=10+2y         (Obtained By adding 2y on both side of Equation (i))

Next divide with 5 on both side to get x:

          x=(10+2y)/5           ------------------ (iii)

Put this value of x in equation (ii):

        4y+20=10((10+2y)/5)

Simplifying the above equation:

         4y+20=2(10+2y)

         4y+20=20+4y

From the above equation the solution of y is not possible.

We can make it 0. So,
         y=0

Put this value of y in equation (iii), to get value of x:

        x=(10+2(0))/5

        x=(10+0)/5

        x=10/5

        x=2

Solve the equation
-18 + 24 = -2(x+6)

Answers

Answer:

x = -9

Step-by-step explanation:

-18+24 = -2(x+6) Distribute and simplify

6 = -2x-12 Add 12 to both sides

18 = -2x Divide by -2 on both sides

-9 = x Here's your answer

Hope this helps! :D

First, do -2 times x. that is -2x.  Next, do -2 times +6. That should be -12. The last steps are in order, add 18 on both sides. it should be -18+18 and -12+18. now you have 24 on the left and -2x and +6. -6 on both sides. 6-6 and 24-6. now you have 18 and -2x. so get rid of the -2x by doing -2x/-2 and on the left side 18/-2. So the answer should be -9=x.

The height of water shooting my fountain is modeled by the function f(x)= -4x^2 +24x -29 where x the distance from the spout in feet. Complete the square to determine the maximum height of the path of the water.

Answers

By the use of the completing the square method, the maximum height is 3 ±√29/4 + 9 m.

What is the maximum height of the water?

The maximum height has been modeled by the use of the equation f(x)= -4x^2 +24x -29. Now we know that f(x)= h so we can write;

h = -4x^2 +24x -29

Now we have;

0 = -4x^2 +24x -29

-4x^2 +24x -29= 0

x^2 - 6x = -29/4

(x - 3)^2 = -29/4 + 3^2

(x - 3)^2 =  -29/4 + 9

x = 3 ±√29/4 + 9 m

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Find an equation for the conic that satisfies the given conditions. ellipse, foci (±2, 0), vertices (±5, 0)

Answers

The equation of the ellipse having foci  (±2,0) and vertices (±5,0) is [tex]x^{2} /4+y^{2} /21=1[/tex].

Given the foci of ellipse is (±2,0) and vertices (±5,0).

We are required to find the equation of ellipse having foci (±2,0) and vertices (±5,0).

Equation is the relationship between two or more variables that are expressed in equal to form. Equation of two variables looks like ax+by=c.

Equation of ellipse is as under:

[tex]x^{2} /a^{2} +y^{2} /b^{2} =1[/tex],where a is the semi major axis.

We have been given that a=5, c=2.

We know that [tex]c^{2} =a^{2} -b^{2}[/tex]

We have to find the value of b.

b=[tex]\sqrt{a^{2} -c^{2} }[/tex]

=[tex]\sqrt{5^{2} -2^{2} }[/tex]

=[tex]\sqrt{25-4}[/tex]

=[tex]\sqrt{21}[/tex]

Using the values of a and b in the equation [tex]x^{2} /a^{2} +y^{2} /b^{2} =1[/tex]

[tex]x^{2} /(2)^{2} +y^{2}/\sqrt{21} ^{2} =1[/tex]

[tex]x^{2} /4+y^{2} /21=1[/tex]

Hence the equation of the ellipse having foci  (±2,0) and vertices (±5,0) is [tex]x^{2} /4+y^{2} /21=1[/tex].

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i need to make a stem and leaf plot for the numbers given below on number 6

Answers

Answer:

See the plot below

=========================

Given data

420, 369, 375, 382, 410, 376, 397, 411, 356, 387, 355, 373

We need to make a stem and leaf plot

Step 1

Rearrange the data in the ascending order:

355, 356, 369, 373, 375, 376, 382, 387, 397, 410, 411, 420

Step 2

Group the data as follows:

355, 356369373, 375, 376382, 387397410, 411420

Step 3

The first two digits form a stem and the last digits form a leaf.

Make a plot:

       Stem   |  Leaf

35       | 5 636       | 937       | 3 5 638       | 2 739       | 741        | 0 142       | 0

A prism is created using 2 regular pentagons as bases. The apothem of each pentagon is 2.8 centimeters.

A regular pentagonal prism is shown. The apothem of each pentagon is 2.8 centimeters. The height of the prism is (2 x + 1). All sides of the pentagon are congruent.

Which expression represents the volume of the prism, in cubic centimeters?
9x2 + 7x
14x2 + 7x
16x2 + 14x
28x2 + 14x

Answers

the expression that represents the volume of the prism is  14x² + 7x cubic centimeters. Option 2

What is the volume of a pentagonal prism?

The  volume of a pentagonal prism is determined using the formula;

V = 5/2abh

where

a is the  apothemh is the height of the prismb is the base of the prism

Now, let's substitute the values given

Let the base be 'x'

The apothem is 2. 8 centimeters

height is 2x + 1

Volume = 5/ 2 × 2. 8 × x × (2x + 1)

Volume = 14/ 2 × x(2x + 1)

Volume = 7x(2x + 1)

Volume = 14x² + 7x

Thus, the expression that represents the volume of the prism is  14x² + 7x cubic centimeters. Option 2

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30 POINTS HELP PLS!!!!!!!

Answers

i really hate how we actually have to type something.

expand and simplify -2(x + 4x^2) + 3(x^2 + 2x)

Answers

......................

Quick algebra 1 question for 10 points!

Only answer if you know the answer, quick shout-out to tariqareesha2 and MrBrainly, tysm for the help!

Answers

Answer: y ≥ [tex]\frac{3}{2}[/tex]x + 3

Step-by-step explanation:

       Since the shaded area is above the line, we will use either > or ≥ for our inequality.

       Next, since this is a solid line we will use the ≥ symbol for our inequality. This means the answer is the first option.

find the LCM of 40 45 and 60 by prime factorization method

Answers

Answer:

This is the answer of this question. Hope it helps.

The SkyWheel has 42 glass enclosed gondolas. What is the measure of each central angle between gondola cars, to the nearest hundredth degree? (just write the numerical answer, no units) (5 points)

Answers

Answer:

8.57.

Step-by-step explanation:

that would be 360/42

= 8.5714

Please help me asap

a. What is the area of the roof that needs to be covered?

b. How many shingles do you need to buy?

Answers

A quantity of 84 shingles are required to cover the surface area of 336 square feet of the first roof.

A quantity of 110 shingles are required to cover the surface area of 220 square feet of the second root.

How many shingles and how many area do we need to cover a root?

In this question we must determine both the surface area and the number of shingles to cover two roof configurations as well. In the first case, we calculate the surface area, which is the sum of the area of rectangles:

A = 2 · (8 ft) · (12 ft) + 2 · (6 ft) · (12 ft)

A = 336 ft²

And the number of shingles required to cover the root is:

n = (336 ft²) / (4 ft²)

n = 84

A quantity of 84 shingles are required to cover the surface area of 336 square feet of the first roof.

In the second, we only need to cover the very top surface. The area and the number of shingles are, respectively:

A = 2 · (5 ft) · (22 ft)

A = 220 ft²

n = (220 ft²) / (2 ft²)

n = 110

A quantity of 110 shingles are required to cover the surface area of 220 square feet of the second root.

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Choose the system for the graph.
y 2 2x+2
y2-x
A.
B.
C.
D.
≤ 2x - 1
yz -x + 2
y≤-2x + 2
(y 2 x
ys 2x + 2
y >- 1x

Answers

Answer:

[tex]\textsf{D.} \quad \begin{cases} y \leq 2x+2 \\ y\geq -\dfrac{1}{2}x \end{cases}[/tex]

Step-by-step explanation:

Both lines in the given system of inequalities are linear equations.

Slope-intercept form of a linear equation:  y = mx + b

(where m is the slope and b is the y-intercept)

Positive slope (m):  as x increases, y increases.

Negative slope (-m):  as x increases, y decreases.

When graphing inequalities:

< or > : dashed lines≤ or ≥ : solid line< or ≤ : shading under the line> or ≥ : shading above the line

The inequality represented by the blue line has a positive slope and shading below the line.

⇒ y ≤ mx + b

From inspection of the graph, its y-intercept is 2.

⇒ y ≤ mx + 2

The inequality represented by the yellow line has a negative slope and shading above the line.

⇒ y ≥ -mx + b

From inspection of the graph, it's y-intercept is zero.

⇒ y ≥ -mx

The only pair of inequalities that satisfies the above conditions is:

[tex]\textsf{D.} \quad \begin{cases} y \leq 2x+2 \\ y\geq -\dfrac{1}{2}x \end{cases}[/tex]

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14²-34 divided by -9+7.2

Answers

Answer:

Let's go part by part:

14 raised to 2 = 196

-9+7x2=-9+14 = 5

196/5= 39,2 (final result)

Answer:

-3.2

Step-by-step explanation:

14 SQUARED is 196

196 - 34 = 5.7647

- 9 + 7.2 = - 1.8

5.7647 / -1.8 = -3.2

-3.2 would be your answer.

The sum of five consecutive positive integers is 2020. Find the largets of these numbers.

Answers

The largest integers of the numbers is 406.

How to find the five consecutive positive integers?

The sum of five consecutive positive integers is 2020.

Therefore,

let

the first positive integer = x

Hence,

x + x + 1 + x + 2 + x + 3 + x + 4 = 2020

5x + 10 = 2020

5x = 2020 - 10

5x = 2010

x = 2010 / 5

x = 402

largest integer = 402 + 4 = 406

Therefore, the largest integers of the numbers is 406.

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Lee y escoge la mejor respuesta Read and select the best answer.Uno de los aspectos ms esperados y polmicos de la legada de Tesla a Espaa es el piloto automatico Esta funcin se puede ubio, pero el conductor debe estar siempre al control del vehiculo. Se baladeun asistente a la conduccin, no un coche autnomo, detalla Milburn. Esta funcin permite que, en una carretera en Madrid, el vehiculo acelere y trene sol, que gire el volante para seguir el bazado de la carretera y que se mantenga a una determinada veidal y dalana deotros vehiculos y objetos.Al probar el piloto automtico en ciudad, el resultado no es el mismo. En una zona cercana a la Puerta de Toledo donde las lineas no estn claramente marcadas, el vehiculo no puede entender por donde teeque ir e dinde est, por lo que desactiva la funcin tampoco puede delectar las luces de los semivos, por lo que no trena en rojo En definitiva no est preparado via para este tipo de conccon y asi toindican deade Tesla.Based on the text, what can you deduce or inter about autopiloted cars?A. They are the future of transportation but need some adjustments in the obyB. They are a way to replace drivers all togetherC. They can be used anywhere except for on highways for safety reasonsD. The police in Spain are going to start implementing them throughout the major obesubmitting your exam What is the distance from (-5,2) and (0,4)? What is the mass of an object that experiences a gravitational force of 685 n near earth's surface where g = 9.80 m/s2? pls help heather had some candy to give to her five children. she first took eight pieces for herself and then evenly divided the rest amount her children. each child received four pieces. with how many pieces did she start? When something is divided between two people according to the worth and inputs of the two individuals, it is said to be ___________ and represents one component of "fairness." A loan that is paid back in a single lump sum payment at the due date of the loan is commonly called a(n):_______ The sister of this man is planning to marry his fiancee's brother. how would you advise this second couple? A 2 gallon container of disinfectant costs 22.72. What is the price per cup Select the correct answer from each drop-down menu. complete this paragraph about the age of exploration by correctly filling in the missing information. in hopes of finding a route to asia, started the first school to teach sailors about oceanic navigation, mapmaking, and more. he sponsored 14 expeditions in 12 years to try to navigate to . finally, was able to successfully complete the journey. this became a stepping stone to find a maritime route to asia. The ________ loop is a good choice when you know how many times you want the loop to iterate in advance of entering the loop. switch do-while while for pre-test Simplify the following polynomial expression. (5x4 - 9x3 + 7x - 1) + (-8x4 + 4x2 - 3x + 2) - (-4x3 + 5x - 1)(2x - 7) What term did max weber use to refer to a disciplined work ethic, this-worldly concerns, and a rational orientation to life emphasized by john calvin and his followers? Which of the following is a role of state government in land use regulation? What is being measured when an advertiser assesses an advertisement's impact through pretesting? In 1656, the Burgmeister (mayor) of the town of Magdeburg, Germany, Otto Von Guericke, carried out a dramatic demonstration of the effect resulting from evacuating air from a container. It is the basis for this problem. Two steel hemispheres of radius 0.430 m (1.41 feet) with a rubber seal in between are placed together and air pumped out so that the pressure inside is 15.00 millibar. The atmospheric pressure outside is 940 millibar. 1. Calculate the force required to pull the two hemispheres apart. [Note: 1 millibar=100 N/m2. One atmosphere is 1013 millibar = 1.013105 N/m2 ]2. Two equal teams of horses, are attached to the hemispheres to pull it apart. If each horse can pull with a force of 1450N (i.e., about 326 lbs), what is the minimum number of horses required? The concept of the _____________ was established to improve the relationship between people and machines to increase organizational effectiveness and efficiency. What primarily differentiates the three types of cone photoreceptors in the retina? If there is an increase in demand for a good, what will most likely happen to the price and quantity of the good exchanged? Part a a calorimeter consists of an aluminum cup inside of an insulated container. The cup is weighed on a top-loading balance and is found to have a mass of 31. 91 g. A reaction is conducted in the calorimeter, raising the temperature from 21. 2 c to 26. 1 c what is the change in heat q for the aluminum cup in units of j? aluminum has a specific heat of 0. 903 j 1 ? 1 write your answer to the correct number of significant figures. When a portion of a chromosome breaks off and attaches to a different chromosome this is called a:_______