. Which value is closest to the value of u . v, given that the angle between u and v is 120 degrees and lul=|v| = 10 a) -73 b ) 49 C) -49 d) 72 = 19/IV / COS/ 200 = 10 * 10x - 1 =- 50 w = uxv. If|ul = 10 and |v| = 5 and the angle between u and v is 1500 then the best approximation for w is: a) 25.0n b) 25.0 c ) 35 .4n d) none of these W= wx = lulvl sinison = 10x5x/ 1 = 25 n 7. If given points A(-1, 2, 4) and B(5, 6, -7), then vector -3BA = a) [18, 12, -33] b) [24, 12, -33] c) [-24, -12, 33] d) none of these BA = ( - 1 - 5, 2-6, 4+7) = (-6, -4, 11) - 3BA = 3(-6,-4, 11) = ( +17, 12 - 33 d h = i+i- 2k, then a - b =