# math

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The cost, in millions of dollars to remove x% of pollution modeled by c=6000/200-2x. A) what is the cost to remove 75% of the pollutant? B) what is the cost to remove 90 % of the pollutant ? C) what is the cost to remove 99 %of the pollutant?D) for what value is this eqaution undefined?

• math -

just replace x by the percentage value
e.g. for 75% removal
cost = 6000/(200-2(75))
= 120

do the same for the others

as to D) when is the denominator zero?
when 200-2x = 0
for when x = 100

so mathematically you could never pay enough to remove 100% of the pollutants.

BTW, I don't see why the function was not reduced to c = 3000/(100-x) ?
Did the text state it this way?

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