Medicine Concentration The concentration C of a medication in the bloodstream t hours after being administered is modeled by the function
C(t) = −0.002t4 + 0.039t3 − 0.285t2 + 0.766t + 0.085
(a) After how many hours will the concentration be highest?
(b) A woman nursing a child must wait until the concentration is below 0.5 before she can feed him. After taking the medication, how long must she wait before feeding her child?
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