SOLUTION: Here is another word problem that I don't understand can some please help me? Thank you. The function f(x) = 180x/100 � x models the cost, f(x) in millions of dollars, to remove

Question 445880: Here is another word problem that I don't understand can some please help me? Thank you.
The function f(x) = 180x/100 � x models the cost, f(x) in millions of dollars, to remove x% of a rivers pollutants. If the government commits $420 million for this project, what percentage of the pollutants can be removed?
? % of the pollutants can be removed.

Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
f(x) = 180x/100 � x
180x/100 � x = 420
180x-100x=42000 Multiply each side by 100.
80x=42000
x=525
.
Ed

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