Calculus

The median weight of a boy whose age is between 0 and 36 months can be approximated by the function w(t) = 8.47 + 1.66t , (1003:\"2 + 0.000642t3. 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 6) below. ' W a) The rate of change of weight with respect to time. w'lt)= I] k