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OpenStudy (anonymous):
Suppose that the credit remaining on a phone card (in dollars) is a linear function of the total calling time (in minutes). When graphed, the function gives a line with a slope of -0.12 . See the figure below. There is 33.12 in credit remaining on the card after 26 minutes of calls. How much credit was there after 12 minutes of calls?
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OpenStudy (anonymous):
|dw:1368837292684:dw|
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