How do I solve these problems

(5) Compute u~v where: u = 1 ,v = 1 (6) Find the angle between the following pairs of vectors: u = [l ,v = U 3 l,_|. (7) Find all real numbers a: sneh that the following vectors are orthogonal [8) Write u = 111 + 112, where 111 is parallel to v and 112 is orthogonal to v