### answers to chapter 10 review questions!

hey everybody!

i didn't put the answers on the review sheet, but here they are.

1. square root of 305.

2. 5 root 10 or square root of 250

3. 4i - 11j -13k

4. square root of 306

5.

6. 23

7. 43i + 29j -49k

8. cos alpha = 7/root 102, cos beta = -7/root 102, cos gamma = 2/root 102

9. 3i + 12j + 3k

10. 8i + 43j + 6k

11. dot product of a and b = 15, so the angle = 84.61

12. -2i - 2j - 2k

i hope these are helpful (and right)

-claire, nat, and allison

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