Question

Media Services charge $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...
My answer is $320 for 10 months service...is this correct

The question then goes on to ask Ifa customer has only $90 available how many months of service can she receive? I do not know how to figure this part out can someone please help!
Your first part is correct.

90 - 20 = 70
70/30 = 2

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