Posted by **jean** on Monday, September 27, 2010 at 9:05pm.

don't know where to start or end! charges $20 for a phone and $30/month for its economy plan. The equation C =30t + 20 describes the total cost, C of operating a media service phone for t months.

The total cost for 10 months of service is $_______.?

If a customer has only 80 available, how many month of service can he receive.

I came up with $180 and 10 months of service for $80