1 K ( 5 Marks ) a) |ul= 5, |v|= 12, and the angle between a and v (when placed tail-to-tail) is 90. Find 12 + V1. b) A vector joins the points A(2, 1) and B(5, 4). Find |AB c) If a = [10, -4, -7] and b = [-3, 1 1, -6], find (a - b ] .5. d) If a = [5, -2, 4], b = [0, 2, -3], and