4. Let u = (1,2,2), v = (1, 1, 1), and w= (3,2,6) be position vectors. Find the volume of the parallelpiped spanned by u, v, and w. 5. Let u and v be vectors such that u • v= √3, ||u|| = 1, and ||v|| = 2 (a): Compute ||u + 2v||². (b) Find the angle between u and v.