Mathematics, 30.04.2021 01:00 daisyperez1
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 31 minutes of calls is $25.35, and the remaining credit after 60 minutes of calls is $21.00. What is the remaining credit after 72 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...
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