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September 23, 2014

September 23, 2014

Posted by **Hannah** on Wednesday, March 31, 2010 at 5:34pm.

v = 3i + j w = 2i - j

- pre-Cal(Please help) -
**Reiny**, Wednesday, March 31, 2010 at 5:45pmv•w = |v| |w|cos Ø

v•w = 6 - 1 = 5

5 = √10√5cosØ

cosØ = 5/√50

Ø = 45°

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