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Math Help - Exponential function problem

  1. #1
    s3a
    s3a is offline
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    Exponential function problem

    This is what I do and don't know what's wrong or what to do next:

    f(x) = ac^x + k
    f(x) = ac^x
    f(x) = 5.5(1.9)^x
    9/5.5 = 1.9^x
    log (9/5.5)/log(1.9) = x
    x = 0.767271953

    What am I doing wrong OR what does that small number mean?

    Any help would be greatly appreciated!
    Thanks in advance!
    Attached Thumbnails Attached Thumbnails Exponential function problem-exponential.jpg  
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  2. #2
    No one in Particular VonNemo19's Avatar
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    Quote Originally Posted by s3a View Post
    This is what I do and don't know what's wrong or what to do next:

    f(x) = ac^x + k
    f(x) = ac^x
    f(x) = 5.5(1.9)^x
    9/5.5 = 1.9^x
    log (9/5.5)/log(1.9) = x
    x = 0.767271953

    What am I doing wrong OR what does that small number mean?

    Any help would be greatly appreciated!
    Thanks in advance!
    decimal point in the wrong place

    1.9percent=.019 not 1.9

    check it out

    (5.5+1.019)^x=9
    Last edited by VonNemo19; June 7th 2009 at 05:14 PM.
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  3. #3
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    c is not 1.9, it is 1.019 because the population increases by 1.9%=.019
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