Mathematics, 20.09.2020 01:01 vitalitas

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 45 minutes of calls is $19.15, and the remaining credit after 3 minutes of calls is $16.81. 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...