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Mathematics, 12.08.2020 04:01 NatsuDDW
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 $28.96 in credit remaining on the card after minutes of calls. How much credit was there after 21 minutes of calls?
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Suppose that the credit remaining on a phone card (in dollars) is a linear function of the total cal...
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