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

Two vectors are given by A = -2 i + 5 j and B = 2 i + 3 j

Also find the angle between them

**2. Relevant equations**

Not really sure but from my book i get A x B = -B x A

**3. The attempt at a solution**

the answer is -16, but I'm confused I thought that it should look like -6 + 10 but why is it minus ten?

How would I use this to find the angle?