Amarshy 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? f(x)equalsstartfraction x squared plus 64 over 2 x endfraction , 1less than or equalsxless than or equals12