<PRE><B>Question 86804</B>
The logistic growth function
P(x) = 90/1+271e^-0.122x
models the percentage, P(x), of Americans who are x years old with some coronary heard disease.
QUESTION: What percentage of 80-year-olds have some coronary heart disease?
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P(80) = 90/(1+271e^(-0.122*80)
P(80) = 90/1.015640663
P(80) = 88.61%
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Cheers,
Stan H.</PRE>