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Thread: Need help badly

  1. #21
    Junior Member Unknown008's Avatar
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    Quote Originally Posted by swerve78 View Post
    0.1x=10 I am not sure what I should do with this next im sorry.
    Hmm, let's try another way.

    What number, when multiplied by 0.1 gives 10?

  2. #22
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    10 right or am I really confused.

  3. #23
    Junior Member Unknown008's Avatar
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    I think you're a little tired

    0.1 is [tex]\frac{1}{10}[/tex]

    And this multiplied by 10 gives:

    [tex]\frac{1}{10}\times 10 = 1[/tex]

    Not 10!

  4. #24
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    so one is my answer to how many minutes a month I need?

  5. #25
    Junior Member Unknown008's Avatar
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    Nuh huh. 100 should be your answer.

    100 divided by 10 gives 10.

    See how it works:

    [tex]0.1(100) = 10[/tex]

    And from our two initial equations:

    [tex]y_A = 0.22x + 25 = 0.22(100) + 25 = 47[/tex]

    [tex]y_B = 0.12x + 35 = 0.12(100) + 35 = 47[/tex]

    So anything longer than or equal to 100 minutes is your answer.

    Here is the graph of the two lines:



    The blue line represents the total cost that company A charges and the purple line represents the total cost that company B charges. You see that for the most part, the line for company B is above that of company A, meaning that for those minutes, company B is more expensive. The point where they meet is where they charge the same fee and as soon as the purple line goes blow the blue line, company B is charging less expensive fees.
    Last edited by Unknown008; 12-01-2011 at 02:14 AM.

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