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31 October, 19:38

Sunny Horizon Cellular's phone plan has a monthly fee of $10.00 and charges $0.10 for every minute used. Stephan's bill for the month was $23.80. If the equation that models this situation is (0.10) m + 10.00 = 23.80, use inverse operations and properties of equality to find the number of minutes Stephan talked during the month.

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  1. 31 October, 23:09
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    (0.10) m + 10.00 = 23.80

    0.10m = 13.80

    m=13.80/0.10

    m = 138 minutes
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