Given the vectors v and u, answer a. through d. below. v=5i-4k u=i+j+k C a. Find the dot product ofv and u. u - v = D Find the length of v. M = E (Type an exact answer, using radicals as needed.) Find the length of u. |u| = E (Type an exact answer, using radicals as needed.) b. Find the cosine of the angle between v and u. cos 8 = E (Type an exact answer, using radicals as needed.) c. Find the scalar component of u in the direction of v. E (Type an exact answer, using radicals as needed.) d. Find the vector projection of u onto v. projvu = E (Type your answer in terms of i, j, and k.)