Let a, b, and c be three vectors such that |a| = 3, |b| = 2√2, |c| = 5, and c is perpendicular to the plane of a and b. If the angle between vectors a and b is π/4, then |a + b + c| is equal to:

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: