can someone please help me

action of the body to a dose of medicine can sometimes be represented by an equation of the form R = M M IN 3 , where C is a positive constant and M is the amount of medicine absorbed in the blond, If the reaction is a change blood pressure, R is measured in millimeters of mercury. If the reaction is a change in temperature, R is measured in degrees, and so on. Find the amount of medicine to which the body is most sensitive by finding the value of M that maximizes the derivative dM dR The value of M that maximizes the derivative (Type an expression using C as the variable.)