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3 years ago

13

What is the product?

1 answer:

castortr0y [4]3 years ago

6 0

The answer is 15r to the 2nd power -14r - 8, so the answer is D).

15r to the 2nd power - 20r + 6r - 8 ( I Used the FOIL method)

15r to the 2nd power + (-20r + 6r) - 8 (Gather like terms)

15r to the 2nd power - 14r - 8 (Simplify)

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Answer:

Part A) see the explanation

Part B) $C(12)=\$54$

Step-by-step explanation:

Part A)

we know that

A relationship between two variables, x, and C, represent a proportional variation if it can be expressed in the form $k=\frac{C}{x}$ or $C=kx$

Let

C ---> is the total cost (represent the output or dependent variable)

x ----> is the number of books (represent the input or independent variable)

In this problem

we have a proportional relationship between the variables x and C

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The linear equation is given by

$C=kx$

The constant of proportionality k is the same that the slope or unit rate of the linear equation

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so

$C=4.50x$

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substitute in the equation and solve for C

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In function notation

$C(12)=\$54$

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3 years ago