A model for the surface area of a human body is given by the function $$ S = f(w, h) = 0.1091w^{0.425}h^{0.725} $$ where $ w $ is the weight (in pounds), $ h $ is the height (in inches), and $ S $ is measured in square feet.
(a) Find $ f(160, 70) $ and interpret it.
(b) What is your own surface area?