What are the answer to the MC?

19) The graph of function f is shown below. At how many points will the graph of f', the derivative of function f, intersect the x-axis? A) 4 B) 6 C) 3 D) 5 20) The function defined by f(x) = 8x2 - 2x4 has A) two local minima and one local maximum C) two local maxima and one local minimum B) one local maximum and one local minimum D) two local maxima and two local minima 21) If f(x) = vtan 2z, then f'(x) = A) sec? 2z B) - scc 2x tan 2x C) _sec2 2x D) - 2 sec 27 Vian 2:r