Please Help ( Differentiation Rule)

A car driving along a freeway with trafc has travelled 50:) = t3 tz + 9: meters In t seconds. 3. Determine the time in seconds when the velocity of the car is it. ' b. Determine the acceleration of the car when the velocity is 0 A book publisher has a cost function given by 13+Zx+3 6(1) = T. where x is the number of copies of a book in thousands and C is the cost, per book, measured in dollars. Evaluate C(32) and explain its meaning