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OpenStudy (anonymous):
A cellular phone company offers a contract for which the cost C, in dollars, of t minutes of telephoning is givin by c= 0.25(t - 500) + 53.95, where it is assumed that t greater than or equal to 500 minutes. What time will keep costs between $100.70 and $117.70?
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OpenStudy (anonymous):
100.70<.25(t-500)+53.95<117.79 solve this linear inequality taking one at a time and get the answer :)
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