Answer
$f(x)=\frac{-0.00722x^4+0.176x^3-1.4x^2+3.39x+17.6}{3.1x+256}$
Work Step by Step
The function for the percent of visits to national parks that were overnight stays is: $f(x)=\frac{-0.00722x^4+0.176x^3-1.4x^2+3.39x+17.6}{3.1x+256}$
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