(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

See the image

http://tinypic.com/r/33z6vz5/7

2. Relevant equations

The rules of dot product multiplication.

3. The attempt at a solution

I've determined that 2 of the solutions are valid, while two of the choices are invalid. I thought C and D looked correct, making A and B incorrect. Unfortunately it wasn't so. I'm down to my last submission and I really don't know what I'm doing wrong.

Thanks you

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Dot Product Rules Multiple choice

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