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 33 minutes of calls is $15.71, and the remaining credit after 57 minutes of calls is $12.59. What is the remaining credit after 62 minutes of calls?
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We are given two points on the linear function: (33, 15.71) and (57, 12.59). Show more…
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