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Note: For questions 1-5 use a = [1, -2,3] and c = [1, -2, -2] Determine la . | a 3 b) - 1 c) 1 d) none of these 2. Determine la x c| a) [10, 5, 0] b) 5V5 C) V126 d) none of these m Express 3a - 2c using standard unit vectors a) i - 2j + 13k b) [1, -2, 13] c) 3x - 25 d) none of these . What value of O is closest to the angle between a and c a) 950 b) 850 c) 800 d) 1000