Answer: c = 7.25r + 9.50
Explanation:
The total cost depends on how much Cooper goes golfing. That variable, something that can change over the course of time, is r. 7.25 times the amount of rounds, r, is how much he'll be paying without the admission ticket.
The 9.50 is an unchanging amount, because he has to pay to get in. That amount is added to the end result. So:
c = 7.25r + 9.50