Media Services charges $40 for a phone and $20/month for its economy plan. the equation c = 20t + 40 describes the total cost, c, of operating a Media Services phone for t months.

The total cost for 3 months of service is $_____

If a customer has only $90 available, how many months of service can she receive?

A. 2

B. 2-1/2

C. 2-1/3

D. 3

Choose the correct graph of the equation c = 20t + 40