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The monthly cost (in dollars) of a long-distance phone plan is a linear function of the...

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 51 minutes of calls is $16.20 and the monthly cost for 100 minutes is $22.08. What is the monthly cost for 89 minutes of calls?

Math   Precalculus   
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