could somebody help me with these three problems?

An object is moving with velocity (in ft/sec) v(t) = t2 3t 4. Find the displacement and total distance travelled from t = 0 to t = 6 Total Distance Travelled: ft A cat on a fence is moving such that its position relative to some fixed point is given by 33(t) = Et3 9t2 + 4033 + 22, where w is measured in centimeters and t is measured in seconds. (No graphing calculators, no CAS.) A. Write an expression for the cat's velocity. v(t) = C] B. What is the cat's velocity when t = 9? cm/s C. Write an expression for the cat's acceleration. a(t) = C] D. What is the cat's acceleration when t = 9? cm/s2 E. When t = 9, is the cat speeding up, slowing down, or stationary? For the given cost function C(22) = 16900 + 6002: + 2:2 find: a) The cost at the production level 1400 :] b) The average cost at the production level 1400 [: c) The marginal cost at the production level 1400 [: d) The production level that will minimize the average cost :] e) The minimal average cost