Question 9 Let a = -52 + 4j + 2k. Find |al. Question Help: Video Message instructor D Post to forum Submit QuestionQuestion 10 Let a =. Find a unit vector in the direction of a Question Help: Video Message instructor D Post to forum Submit QuestionQuestion 11 Find a vector u with initial point (-3, -5, -3) and terminal point (-11, 1, -4). Then find a unit vector in the direction of U. Enter your answers in i, 3, k format. U = Unit vector = Question Help: Message instructor O Post to forum Submit