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Thinking 21. Given 55 = (2, 5), 5 = (-5, 12) find the scalar projection of J? on 3-. [2 Marks] 22. If (-1, 3,

Thinking 21. Given 55 = (2, 5), 5\" = (-5, 12) find the scalar projection of J? on 3-\". [2 Marks] 22. If (-1, 3, 5) x (0, a, 1) = (-2, 1, -1), determine a. [2 Marks]

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