Question

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
30x10+20=320
4months

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