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Algebra

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a cellular phone company offers a contract for which the cost C in dollars of t minutes is given by C 0.25 (t-300)+ 61.95 where it is assumed that t¡Ý 300 minutes what time will keep $99.45 and 145.95

  • Algebra -

    Solve 99.45 = 0.25 (t-300)+ 61.95
    for time, t

    Then repeat the process for
    145.95 = 0.25 (t-300)+ 61.95

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