Chapter 4.6, Problem 17PPE

To determine

To find:The amount paid to buy 4 containers of orange juice.

Answer to Problem 17PPE

$11

Explanation of Solution

Given information:You are buying orange juice for $4.50 per container and have a gift card of worth $7. The function $f(x)=4.50x-7$ represents your total cost $f(x)$ if you buy x containers of orange juice and use the gift card.

Calculation:The function is $f(x)=4.50x-7$ .

Putting $x=4$ in the function,

  $\begin{array}{l}f(4)=4.50(4)-7\\ \Rightarrow f(4)=18-7\\ \Rightarrow f(4)=11\end{array}$

Thus, you have to pay $11 to buy 4 containers of orange juice.