I came up with 7+5(x-1) 7 is a fixed one time cost. 5(x-1). x-1 because you have already charged $7 for the first hour.
Checking to make sure it is correct so if a person stays 1 hour 7+5(1-1) 7+5(0) = 7 This answer makes sense because they get charged $7 the first hour
so say they stay 3 hours 7+5(3-1) 7+5(2) = 17 This answer makes sense because they get charges $7 for the first hour and $5 for the other 2. so 7+5+5=17.
