D. lamar's teacher extended the graph as shown below and asked lamar to write the function for the graph shown below using f(x) for the function name.

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )