Let a =5i − j, b =7i −3j +2k, c =−4i +9j −8k, and d =−3i −11j +7k. Calculate the following or indicate that the expression is not defined.
(a) a + b + c + d
(b) 2a +3b
(c) b/d
(d) c −4a
(e) ad
(f) ∥c − b∥
(g) a/∥a∥
(h) ∥a∥b −∥b∥a
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