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December 20, 2014

Homework Help: Math

Posted by Loli on Sunday, December 18, 2011 at 1:35pm.

A cellular phone company offers a contract for which the cost C, in dollars, of t minutes of telephoning is given by C=0.25(t-300)+79.95, where it is assumed that t≥300 minutes. What times will keep costs between $127.45 and $156.70?

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