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QUESTION
The monthly cost (in dollars) of a long-distance phone plan is a linear function of the total calling time (in minutes). The monthly cost for 50 minutes of calls is $13.98 and the monthly cost for 78
The monthly cost (in dollars) of a long-distance phone plan is a linear function of the total calling time (in minutes). The monthly cost for 50 minutes of calls is $13.98 and the monthly cost for 78 minutes is $17.06 . What is the monthly cost for 77 minutes of calls?
