The function f(x) =180x/100-x models the cost....

The function f(x) =180x/100-x models the cost, f(x), in millions of dollars, to remove x% of a river’s pollutants.  If the government commits $320 million for this project, what percentage of the pollutants can be removed?
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When f(x)=320, x% of pollutants can be removed. 180x/(100-x)=320; x/(100-x)=320/180=16/9.

9x=16(100-x)=1600-16x; 25x=1600 so x=64. 64% of pollutants cost $320M to remove.

by Top Rated User (1.2m points)

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