math

A cellular phone company offers a a contract for which the cost C, in dollars, of t minutes of telephoning is given by C=0.25(t-600) + 40.95, where it is assumed that t ¡Ý600 minutes. What times will keep costs between $83.45 and $104.20? For the costs to be between $83.45 and $104.20, the telephoning time must be between ____ minutes and _____ minutes.

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  1. Put each of those costs in the equation as C and find out what t is for each.

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