(a) If a is a vector in R2 or R3, what is 0a Prove your answer. (b) If a is a vector in

Chapter 1, Problem 21

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(a) If a is a vector in R2 or R3, what is 0a? Prove your answer. (b) If a is a vector in R2 or R3, what is 1a? Prove your answer.determined by a and b. (Hint: It may help to draw a picture.) (b) Now suppose that a = (2, 2, 1) and b = (0, 3, 2). Describe the set of vectors{x = sa + tb | 0 s 1, 0 t 1}.

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