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Thread: Function word problem

  1. #1
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    Function word problem

    I'm having started on this problem, could somebody help me out?


    According to projections by the Alzheimer's Association, the number of people suffering from Alzheimer's disease in year x is approximated by

    A(x) = 4.23 * 1.023^x

    where x = 0 corresponds to year 2000. When will the number of people with Alzheimer's disease be

    (a) 8 million? (b) 13 million?
    Last edited by skeeter; Jun 7th 2017 at 02:32 PM.
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  2. #2
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    Re: Function word problem

    $A = 4.23 \cdot 1.023^x$

    $\dfrac{A}{4.23} = 1.023^x$

    $\log\left(\dfrac{A}{4.23}\right) = x \log(1.023)$

    $\dfrac{\log\left(\dfrac{A}{4.23}\right)}{\log(1.0 23)} = x $

    substitute your values for $A$ and calculate the value of $x$
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    Re: Function word problem

    ?? Is this in response to some question?
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    Re: Function word problem

    Quote Originally Posted by HallsofIvy View Post
    ?? Is this in response to some question?
    OP is inserting links to some Vietnamese page ... when he/she does that, the post becomes moderated. Thread closed to prevent further insertions.
    Thanks from topsquark
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