4. A kite 100 ft above the ground moves horizontally at a speed of 9 ft/s. At what rate is the angle (in radians) between the string and the horizontal decreasing when 200 ft of string have been let out? [8 points] UNIV 5. Determine whether the statement is true or false. Explain. [7 points each] DEA a. d |x4 + x1 = 14x3+11 UNIV dx MICb. If f(x) = (x - a)(x- b)(x - c), then f' (x ) 1 1 DEARUURN. LAMMTZ. x- a x-b X-C WINIYLAS1 1 MICHIGAN ULARUVAI f (x) V ITT