True False. Please write a clear capital letter. If an answer is FALSE, for full marks you must explain why it is false in the whitespace near the question. 12. The result of adding two opposite vectors is always the zero vector. 13. For non-zero, non-parallel vectors u and v, you can never write the 0 as a non-zero linear combination of u and v. 14. If two vectors are colinear then their cross-product equals the O. 15. The expression (u X w) X v has no meaning. 16. The expression (u . W) v has meaning. 17. Two vectors in 3-space are always coplanar