Question: Let u = 5i - j + k, v = j - 5k, w = -15i + 3j - 3k. Which vectors, if any, are

Let u = 5i - j + k, v = j - 5k, w = -15i + 3j - 3k. Which vectors, if any, are 

(a) Perpendicular? 

(b) Parallel? Give reasons for your answers.

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