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Math Help - Help with a problem

  1. #1
    Junior Member
    Joined
    Feb 2008
    Posts
    49

    Help with a problem

    Using this equation:

    f(A)=-0.0197A^2+1.85A+9.90

    Where f(A) is the percentage of Americans at age A who say they do volunteer work.

    a.) Estimate the percentage of 25-year-old Americans who say they volunteer. Did you perform interpolation or extrapolation?

    b.) Estimate the percentage of 16-year-old Americans who say they volunteer. Did you perform interpolation or extrapolation?

    c.) For what age do half of Americans say they volunteer?

    d.) For what age is the percentage who say they volunteer the greatest? What is that maximum percentage?

    MY ANSWERS

    a.) 44.1 % extrapolation
    b.) 35 % extrapolation
    c.) 99 years old
    d.) No clue!

    Are my answers correct? And what is the answer for question D ?

    Thanks in advance!
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  2. #2
    MHF Contributor kalagota's Avatar
    Joined
    Oct 2007
    From
    Taguig City, Philippines
    Posts
    1,026
    for your d, take note that your function is parabolic which opens downward and thus has a maximum point. find that point using any method you know..
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