Question

Suppose that the function f(x) = 3x + 15 represents the cost to rent x movies a month from an internet movie club. Bralen now has $12. How many more dollars does Bralen need to rent 8 movies next month? a. 39b.27 C. 51 d. 59

Answer 1

In order to rent 8 movies, the total cost is:

`\begin{gathered} f(x)=3x+15 \\ f(8)=3\cdot8+15 \\ f(8)=24+15 \\ f(8)=39 \end{gathered}`

Since Bralen already has $12, he needs:

`39-12=27`

So Bralen needs $27 more dollars, therefore the correct option is b.