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4. Consider the vectors u = (-7 ,4, - 1) and = (8, 0, - 6) [4 marks] a) Determine a vector equivalent to 4u

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4. Consider the vectors u = (-7 ,4, - 1) and = (8, 0, - 6) [4 marks] a) Determine a vector equivalent to 4u - $5. b) Express u as a linear combination of the vectors i, j and k. c) Determine the exact value of | u + vl. d) State a vector that is perpendicular to v

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