February 27, 2017

Homework Help: algebra

Posted by jeanette on Sunday, September 27, 2009 at 6:45pm.

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-600)+ 79.95, where it is assumed that t>=600 minutes. What times will keep costs between $119.45 and $162.70? For the costs to be between $119.45 and $162.70 , the telephoning time must be between __ minutes and __ minutes.

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