Knowledge/Understanding. Please use CAPITAL LETTERS for the Multiple Choice and True False For full marks in this section you must show rough work in the space near each question. 1. If u = [1, 3, 1] and 3 = [-1, -1, 1] find Zu x 3 a) [1, 9, 13] b ) [ 8 , - 4 , - 4 ] c ) 4 [2, - 1, 1] d) none of these Unit 5 2. If u = [2, 0, 0], 7 = [0, 2, 0], w = [0, 0, 4] find |u + 20 + wl a 6 b) 8 C ) 2V6 d) none of these m If 2u = [0, 3, 4] and v = -2[12, 0, 5] find | u . | a) 10 b) 40 C) -40 d) none of these If u = [-1, 1, 1] and v = [1, 2, 1], which of the following vectors is orthogonal to both u and v. a ) [0, 6 , -6 ] b ) [ - 8 , 4 , 0] c ) [2, 1 , - 3] d) none of these