The size of an unborn fetus of a certain species depends on its age. Data for Head circumference (H) as a function of age (t) in weeks were fitted using the formula H= -29.53 + 1.07312 - 0.22331log t. dH (a) Calculate the rate of fetal growth dt dH (b) Is larger early in development (say at t= 8 weeks) or late (say at t= 36 weeks)? dt 1 dH (c) Repeat part (b) but for fractional rate of growth Hdt