Question: Media Services charges USD 30 for a phone & USD 20 per month for its economy plan. The equation C=20t + 30 describes the total costs, C, of the operating a media services phone for t months.
[A] If a customer has only USD 80 available how many months of services can she receive?
[B]The total cost for 3 months of service is $_________
[C]Graph the equation C= 20t + 30