16. m If sin(xy) = x, then dx (A) cos(xy ) (B) x cos(xy) C) 1- cos(xy) (D) 1- ycos(xy) cos(xy ) x cos(xy) (E) y(1- cos(xy)) X HN 5 Graph of f 17. The graph of the function f shown above has horizontal tangents at x = 2 and x = 5. Let g be the function defined by g(x) = [f(t)di . For what values of x does the graph of g have a point of inflection? (A) 2 only (B) 4 only (C) 2 and 5 only (D) 2, 4, and 5 (E) 0, 4, and 6 18. In the xy-plane, the line x + y = k, where k is constant, is tangent to the graph of y = x + 3x + 1. What is the value of k? (A) - 3 (B) - 2 (C) - 1 (D) O (E) 1 x(1) 0 19. A particle moves along a straight line. The graph of the particle's position x(t) at time t is shown above for 0