SOLUTION: A cellular phone company offers a contract for which the cost c is in dollars, of t minutes of telephoning is c=0.25 (t-500) + 47.95 where t>=500 what time will keep cost between 9
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Question 278148: A cellular phone company offers a contract for which the cost c is in dollars, of t minutes of telephoning is c=0.25 (t-500) + 47.95 where t>=500 what time will keep cost between 92.70-123.20 Answer by checkley77(12844) (Show Source):
You can put this solution on YOUR website! c=0.25(t-500)+47.95
92.70<.25(t-500)+47.95<123.20
92.70<.25t-125+47.95<123.20
92.70<.25t-77.05<123.20
92.70+77.05<.25t<123.20+77.05
169.75<.25t<200.25
169.75/.25
679
%92.70 & $123.95.]
679-500=179 minutes is the minimum min. over the 500.
801-500=301 minutes is the max min. over the 500.
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