The graph shows the daily revenue earned selling coupon cards in a fundraiser if the price is decreased by x dollars.

A graph shows decrease in price (dollar sign) labeled 1 to 10 on the horizontal axis and daily revenue (dollar sign) on the vertical axis. A line increases from 0 to 3 then decreases from 3 to 9.
Which function can be used to determine the daily revenue if the price of a coupon card is decreased by x dollars?

R(x) = –x2 + 6x + 40
R(x) = –(x – 4)(x + 10)
R(x) = –(x2 – 14x + 40)
R(x) = –(x + 3)2 + 49