8. An older sibling stands 12 feet from little brother and watches a balloon tragically rising directly above the little brother. The balloon is rising at a 4 constant rate of 2 feet/sec. What is the rate of change, in radians per second, of angle 6 at the instant when the balloon is 16 feet above the ground? (A) in 16 feet (B) !!! HOE (D) 12 feet 9. The relationship between v and m is defined by 4v2 = v2m. At the instant at which at = 2 and v = 1, am ? what is at (A) 96 (B) 48 (C) 32 (D) 16 10. The graph of the twice differentiable function f(x) is shown. Which of the following is true? (A) f(2)