There is a formula that estimates how much your puppy will weigh when it reaches adulthood. The method we present applies to medium-sized breeds. First find your puppy's weight w, in pounds, at an age of a weeks, where a is 16 weeks or less. Then the predicted adult weight

W = W(a, w),

in pounds, is given by the formula

W = 52

w

a

.

(a) Use functional notation to express the adult weight of a puppy that weighs 4 pounds at 11 weeks.

W(

(b) Calculate the predicted adult weight for the puppy from part (a). (Round your answer to two decimal places.)