Answer:
Total amount paid = 20 + 15x
11 months
Explanation:
Annual fee = $20
User charge per month = $15
Number of months = x
Total amount paid = 20 + 15x
Felix prepaid = $185
Total amount paid = 20 + 15x
185 = 20 + 15x
Subtract 20 from both sides
185 = 20 + 15x
185 - 20 = 20 + 15x - 20
165 = 15x
Divide both sides by 15
x = 165 / 15
= 11
x = 11 months