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25 January, 14:40

A cell phone company charges a basic rate of $19.99 per month for 300 minutes of local usage. Any local usage over 300 minutes is charged at $.10 per minute. All long distance calls are charged at $.25 per minute. Write and simplify an expression that gives the total monthly bill if x is the number of local minutes and y is the number of long distance minutes. Evaluate the expression if local usage totals 375 minutes and long distance usage totals 54 minutes.

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  1. 25 January, 15:49
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    total = 19.99 + 0.10 (x-300) + 0.25y

    x = 375

    y=54

    total = 19.99 + 0.10 (375-300) + 0.25 (54)

    total = 19.99 + 0.10 (75) + 0.25 (54)

    total = 19.99 + 7.50 + 13.50

    total = $40.99
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