Mathematics, 29.01.2021 21:00, Michael321

The credit remaining on a phone card (in dollars) is a linear function of the total calling time made with the card (in minutes). The remaining credit after 39 minutes of calls is $24.54, and the remaining credit after 56 minutes of calls is $ 22.16. What is the remaining credit after 71 minutes of calls?

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The credit remaining on a phone card (in dollars) is a linear function of the total calling time mad...