13) v = -5i + 9j and u = 3i + 9j A) -2i + 18j B) 66 C) -96 D) - 151 + 81j 14) v = 8i - 2j and u = -4i + 5j A) - 32i - 10j B) -22 C) 41 + 3j D) -42 15) v = 5i - 7j and u = -8i - 8j A) - 401 + 56j B) -96 C) 16 D) -3i - 15j 16) v = 6i - 9j and u = -7~13i + 2j A) - 18 13 + 42 B) (6 - 7 13)i - 7j C) - 18\\13i - 42j D) - 18 - 42\\13 17) v = - 1 and u = 1 -1 29 29 V29 29 2 A) 29 B) C) O D) 29 29- 29 A) 0 B) 51 - TT 2 D) FF Find the angle between u and v in radians. 19) u = 31 + 9j + 6k, v = 6i + 6j + 7k A) 1.48 B) 0.39 C) 1.09 D) 1.18 20) u = -91 + 2j - 8k, v = 5i + 9j - 9k A) 1.57 B) 1.30 C) 0.27 D) 1.44 21) u = 8i - 4j - 9k, v = 8i + 4j - 2k A) 0.60 B) 1.57 C) 0.97 D) 1.30 22) u = -2i - 6j, v = 7i + 6j + 8k A) 2.28 B) 1.84 C) -0.70 D) 1.58 23) u = 3j - 7k, v = 7i - 5j - 10k A) 0.99 B) 1.33 C) 0.58 D) 1.57 24) u = 9i, v = 9i - 8j A) 0.73 B) 1.20 C) 1.56 D) 0.84 Find a function r(t) that describes the line or line segment. 25) The line through P(4, 9, 3) and Q(1, 6, 7) A) r(t) = (4 - 3t, 9 + 4t, 3 - 3t) B) r(t) = (4 - 3t, 9 - 3t, 3 + 4t) C) r(t) = (4 - 3t, 9 - 4t, 3 + 3t) D) r(t) = (4 + 4t, 9 - 3t, 3 - 3t)