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 28 minutes of calls is $$15.80$$, and the remaining credit after $$60$$ minutes of calls is $$11.00$$. What is the remaining credit after $$81$$ minutes of calls? Español
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The problem states that the remaining credit on a phone card is a linear function of the total calling time. We are given two data points: 1. After 28 minutes of calls, the remaining credit is $15.80. 2. After 60 minutes of calls, the remaining credit is Show more…
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