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Math Help - Word Problem C= 0.25(t-400) + 48.95

  1. #1
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    Wink Word Problem C= 0.25(t-400) + 48.95

    A cellular phone company offers a contract for which C, in dollars of t minutes of telephone is given by

    C= 0.25(t-400) + 48.95

    Assuming that t > 400

    What times will keep (for the cost) between $90.70 and $129.95

    Phone time must be between ________ Min and _______ Min.

    What do I have to do first? Estimate the amount of minutes?
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  2. #2
    MHF Contributor
    Grandad's Avatar
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    Hello OneidaFL
    Quote Originally Posted by OneidaFL View Post
    A cellular phone company offers a contract for which C, in dollars of t minutes of telephone is given by

    C= 0.25(t-400) + 48.95

    Assuming that t > 400

    What times will keep (for the cost) between $90.70 and $129.95

    Phone time must be between ________ Min and _______ Min.

    What do I have to do first? Estimate the amount of minutes?
    You need to solve two equations for \displaystyle t, to find the values of \displaystyle t that make C = 90.70 and C = 129.95.

    That is, you need to solve:
    90.70 =0.25(t-400) + 48.95<br />
    and
    129.95 =0.25(t-400) + 48.95<br />

    These solutions will give you the minimum and maximum values you require.

    Can you complete it now?

    Grandad
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  3. #3
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    You just make it seem so simple........ thank you.
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