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31 October, 20:18

The cost "c" (in dollars) of renting a paddle board for "h" hours is given by c=25+7h. After how many hours is the cost $81?

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  1. 31 October, 20:35
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    C = 25 + 7h ... c = 81

    81 = 25 + 7h

    81 - 25 = 7h

    56 = 7h

    56/7 = h

    8 = h ... so at 8 hrs, it will cost $ 81
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