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21. If u and v are collinear and the magnitude of u is 7 times the magnitude of v, write an expression that represents the

21. If u and v are collinear and the magnitude of u is 7 times the magnitude of v, write an expression that represents the sum of u and v. [2 marks] 2. Determine the area of AABC with vertices A(2, - 1, 4), B(3, 1, - 1), and C (1, 0, 2). [4 marks]

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