You want to buy your friend some $50 i-tunes gift cards. You have a $5 off coupon for the total purchase. Write a function to represent the cost of the gifts. What would be the cost of 4 gift cards?

Question

jdoe0001 · Answer

$\begin{array}{llll}
\textit{gift cards}&\textit{cards total cost}&\textit{discount}\
\hline\
2&50\times 2&-5\
5&50\times 5&-5\
12&50\times 12&-5\
20&50\times 20&-5\
100&50\times 100&-5\

\end{array}$

what do you think?

anonymous · Answer

50 x 4 - 5?

anonymous · Answer

the function should be represented as $f(x)=something$ where $x$ is the number of gift cards purchased.  in your case it will be $f(x)=50x-5$

anonymous · Answer

your answer above it the answer to the second part.  the cost of 4 gift cards will be 
$$f(4)=50\times 4-5$$

anonymous · Answer

Thank you so much!