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OpenStudy (anonymous):
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 0.09 . See the figure below. The monthly cost for 31minutes of calls is $13.36. . What is the monthly cost for 26 minutes of calls?
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OpenStudy (anonymous):
(13.36 - y ) / ( 31 - 26) = .09 Can you find y is monthly cost of 26-minute call?
OpenStudy (anonymous):
how do u do that?
OpenStudy (anonymous):
what is 31-26?
OpenStudy (anonymous):
then multiply by .09
OpenStudy (anonymous):
55.6??
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