Mathematics, 17.02.2020 21:08, Gabilop

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 40 minutes of calls is 25.20, and the remaining credit after 68 minutes of calls is 21.84 . What is the remaining credit after 75 minutes of calls?

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The credit remaining on a phone card (in dollars) is a linear function of the total calling time mad...