Question

Media Services charge $30 for a phone and $20/month for its economy plan. The equation c=20t+30 describes the total cost, c, of operating a Media Services phone for t months. The total cost for 7 months of service is? If customer has only $80 available, how many months of service can she receive?
c = 20(7) + 30 = ?

80 = 20t + 30 = ?

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