Craig went bowling with $35.50 to spend. He rented shoes for $6.50 and paid $7.25 for each game. Write an equation to determine s, the greatest number of games Craig could have played?

a) 7.25s - 6.50 = 35.50
b) 7.25s + 6.50 = 35.50
c) 7.25s - 6.50 ≤ 35.50
d) 7.25s + 6.50 ≤ 35.50