The median weight of a boy whose age is between [I and 36 months can be approximated by the function w(t] = 9.24 +1.64t nausea2 + 0.0002639, where t is measured in months and w is measured in pounds. Use this approximation to nd the following for a boy with median weight in parts a] through c] below. a] The rate of change of weight with respect to time. w'(t)=