Answer the following:

4. Given A(5, -2, 3), P(6, 0, O), and AP/AB = 1/3, find B. 5. Find the unknown quantity where A(5, 1, O), B(1, y, 20), and AB = 6. 6. The point (-1, 5, 2) is at a distance 6 from the midpoint of the segment joining (1, 3, 2) and (x, -1, 6). Find x. 7. The point (1, -2, 9) is at a distance Sx/g from the midpoint of the segment joining (1, y, 2) and (5, -1, 6). Find y