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13-10-2022
Mathematics

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The credit remaining on a phone card dollars) is a linear function of the total calling time made with the card (in minutes). The remaining credit after 42
minutes of calls is $24.96, and the remaining credit after 54 minutes of calls is $23.52. What is the remaining credit after 61 minutes of calls?
Remaining
credit
(in dollars)
Calling time
(in minutes)
$0
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