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a) $u$ and $w$ are parallel

b) $u$ is parallel to $v + w$

c) $v$ and $w$ are orthogonal

d) $u$ is orthogonal to $v + w$

I chose d) since $u\cdot(v+w) = u\cdot v + u\cdot w$.

  • 2
    It is correct..2012-11-01

2 Answers 2