The brain mass of a fetus can be estimated using the total mass of the fetus by the function b = 0.22m0.87, where mis the mass of the fetus (in grams).
Suppose the brai mass of the 20-g fetus is chnaging at a rate of 0.23 g per day. Use this to estimate the rate of chnage of the total mass of the fetus dm/dt dm/dt= __g per day