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QUESTION
The credit remaining on a phone card is a linear function of the total calling time made with the card. The remaining credit after 20 minutes of calls is $17.00, and the remaining credit after 33 minu
The credit remaining on a phone card is a linear function of the total calling time made with the card. The remaining credit after 20 minutes of calls is $17.00, and the remaining credit after 33 minutes of calls is $15.05 what is the remaining credit after 39 minutes of calls
