SOLUTION: A cellular phone company offers a contract for which the cost C in dollars,of t minutes if telephoning is given by C=0.25(t-300)+59.95, where it is assumed that t>300 minutes. What
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Question 277798: A cellular phone company offers a contract for which the cost C in dollars,of t minutes if telephoning is given by C=0.25(t-300)+59.95, where it is assumed that t>300 minutes. What times will keep costs between $107.70 and $125.70?
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
107.70<0.25(t-300)+59.95<125.70
107.70<.25T-75+59.95<125.70
107.70<.25T-15.05<125.70
107.70+15.05<.25T<125.70+15.05
122.75<.25T<140.75
122.75/.25
491
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