1. W is a subspace of R3.
2. W is a subspace of R3.
3. W is not a subspace of R3.
4. W is not a subspace of R3.
5. W is a subspace of R4.
6. W is a subspace of R4.
7. W is not a subspace of R2.
8. W is a subspace of R2.
9. W is not a subspace of R2.
10. W is not a subspace of R2.
11. W is a subspace of R4.
12. W is not a subspace of R4.
13. W is not a subspace of R4.
14. W is not a subspace of R4.
15. u=(−1, 0, 1, 0) and v=(−4, −2, 0, 1)
16. u=(−1, −1, 0, 1) and v=(−5, −3, 0, 1)
17. u=(1, −3, −2, 0) and v=(−2, 1, 0, 1)
18. u=(2, −1, −2, 1, 0) and v=(3, −4, 5, 0, 1)
19. u=(1, 2, −1, 0)
20. u=(−5, 3, −2, 1)
21. u=(−3, 2,−4, 1)
22. u=(−6, 4,−3, 1)