Only question 13

Find an equation for the sphere that satisfies the given conditions. 9. Centered at (0, 2, -1) with radius 3. 10. Centered at (1, 0, -2) with radius 4. 11. Centered at (2, 4, -4) and passes through the origin. 12. Centered at the origin and passes through (1, -2, 2). 13. The line segment joining (0, 4, 2) and (6, 0, 2) is a diameter