Monthly cost of a long-distance phone plan


Discussion:

Q: Suppose that the monthly cost of a long-distance phone plan (in dollars) is a linear function of the total calling time (in minutes). When graphed, the function gives a line with a slope of .11.

The monthly cost for 40 minutes of calls is 16.68. What is the monthly cost for 32 minutes of calls?

 

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Engineering Mathematics: Monthly cost of a long-distance phone plan
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