You can buy a 6-hour phone card for 500 but the fine print


You can buy a 6-hour phone card for $5.00, but the fine print says that each minute actually costs you 1.5 minutes of time. What is the equation that models the number of minutes left on the card compared with the number of minutes you actually talked?

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Algebra: You can buy a 6-hour phone card for 500 but the fine print
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