Question

Dave wants to rent a car for the week. The cost of the car rental is a flat amount of $50 plus $0.12 per mile traveled.

Which statement best describes the function that could be used to model the cost of the car rental, (d), as a
function of distance, d, in miles?

A)The function can be represented by the equation C(d) = 50 +0.12d, and the function is an exponential function.


B)The function can be represented by the equation C(d) = 50 +0.12d, and the function is a linear function.

C)The function can be represented by the equation C (d)=50+(0.12)d and the function is an exponential function.

D)The function can be represented by the equation C (d)=50+(0.12)d, and is a linear function
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Answer 1

B) or D) could be used

Explanation:

If it says that the car costs $50 even if you haven't moved a mile, that is the independent variable.

The $0,12 depends on how many miles the car travels.

As it moves in a linear way as the miles grow, it is a linear function.

So :

B) C(d)= 50 + 0,12d linear function

And it is also valid to write:

D) C(d)= 50 + (0,12)d linear function

Answer 2

B

Explanation:

They give it in plain words.

`C(d) = 50 + 0.12d`

And as the d is used once and not as a exponent, we can consider this as a variable.