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25 March, 21:15

For his long distance phone service, David pays a $3 monthly fee plus 11 cents per minute. Last month, David's long

distance bill was $23.57. For how many minutes was David billed?

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  1. 25 March, 21:19
    0
    187 minutes

    Step-by-step explanation:

    Let the total bill be represented by b (x), where x is the number of minutes used.

    Then b (x) = $3.00 + ($0.11/mile) x.

    If David was billed $23.57, for how many minutes was he billed? Set this equation = to $23.57 and solve for x:

    $23.57 = $3.00 + ($0.11/min) x, or

    $20.57 = ($0.11/min) x.

    To find x, divide both sides by $0.11/min:

    x = $20.57 / ($0.11/min) = 187 minutes
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