False 1. If v, w, x E R" are vectors with v · w = 0 and w· x = 0, then v•x = 0 too. False 2. If v, w e R" are vectors with |v· w| < 1, then ||v|| < 1 or ||w|| < 1 (or both). True 3. There exist vectors v, w ER' such that ||v|| = 1, ||w|| = 2, and v ·w = -1. True 4. If v, w, x E R" are vectors with v · w = v• X, then w = x. False 5. If v, w E R" are vectors with ||v|| + ||w|| < 2, then ||v + w|| < 2 too.

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