If p = -5i + j - k, q = 2i + j + 2k, and r = 4i + 2j - 2k, then the volume of the parallelopiped whose coterminous edges are q + r, r + p, and p + q is:

If a = (0, -1, 2), b = (1, 0, -1) and c = (2, -1, 0), then which of the following is a unit vector parallel to a - b - c?

If a = 2î + 3ȷ and b = î - ȷ, then a - b is:

If vectors a and b are perpendicular with |a| = 5 and |b| = 12, then |a + b| is equal to: