Problem 14. (1 point) Let VR and let H be the subset of V of all points on the plane 3z-7y-7 -21. Ha subspace of the vector space V'? 1. Does H contain the zero vector of V choose Remaining time 2. Is I closed under addtion? if it is, enter CLOSED. If & is not, enter two vectors in H whose sum is not in H, using a comma separated list and syntax such as