SOLUTION: Could someone please show me how to solve this? A cellular phone company offers a contract for which the C, in dollars, of the t minutes of telephoning is given by C=0.25(t-300)+42
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Question 439471: Could someone please show me how to solve this? A cellular phone company offers a contract for which the C, in dollars, of the t minutes of telephoning is given by C=0.25(t-300)+42.95. Where it is assumed that t is less than or equal to 300 minutes. What time will keep the costs between $84.95 and $114.45 the telephoning time must be between _ and _ minutes
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Could someone please show me how to solve this? A cellular phone company offers a contract for which the C, in dollars, of the t minutes of telephoning is given by C=0.25(t-300)+42.95. Where it is assumed that t is less than or equal to 300 minutes. What time will keep the costs between $84.95 and $114.45 the telephoning time must be between _ and _ minutes
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t <= 300
84.95 <= 0.25(t-300)+42.95 <= 114.45
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Subtract 42.95 along the line to get:
42.50 <= 0.25(t-300) <= 71.5
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Divide thru by 0.25 to get:
170 <= t-300 <= 286
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Add 300 to get:
470 <= t <= 586
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But t <=300
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Hummmmmm????
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Cheers,
Stan H.
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