February 28, 2017

Homework Help: math

Posted by Ryan on Sunday, March 21, 2010 at 4:59pm.

A cell phone company offers a contract for which the cost C, in dollars, of T minutes of telephoning is given by C=0.25(t-600)+71.95, where it is assumed the t greater than 600 minutes. What times will keep costs between $119.20 and $135.45?

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