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A marshy region used for agricultural drainage has become contaminated with a particular element. It has been determined that flushing the area with clean water

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A marshy region used for agricultural drainage has become contaminated with a particular element. It has been determined that flushing the area with clean water will reduce the element for a while, but it will then begin to build up again. A biologist has found that the percent of the element in the soil x months after the flushing begins is given by the function below. When will the element be reduced to a minimum? What is the minimum percent? x2 +81 f(x) = 2x , 15xs 12 Find f' (x). f' (xx) =] When will the element be reduced to a minimum? The element will be reduced to a minimum after month(s). (Type an integer or a decimal.) What is the minimum percent of the element? The minimum percent of the element will be %. (Round to the nearest hundredth as needed.)

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