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Mathematics, 20.03.2021 04:50 kirinaallison

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 -0.13. See the figure below.
There is $24.29 in credit remaining on the card after 33 minutes of calls. How much credit was there after 21 minutes of calls?

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