One hour after x milligrams of a drug are given to a person, the change in body temperature T(x) (in degrees fahrenheit) is given by the function

T(x)=x^2(1−x/3).
Further, the rate T′(x) at which T changes with respect to the size of the dosage, x, is called the sensitivity of the body to the dosage. Find:
(A) T′(1) =

(B) T′(3) =

(C) T′(6) =