mlengland2013 mlengland2013

12-12-2022
Mathematics

Answered

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 25 minutes of calls is $21.00, and the remaining credit after 63 minutes of calls is $14.92. What is the remaining credit after 78 minutes of calls?

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