13.Solve: 10² =?
14. Solve:8³ =?
15. Solve: 15² =?
16. Solve: (3×2) +8 -11 =?
17. Solve: 7+8×2-6=?
18. Solve: 3²+6-7×3=?
19. Solve: (+2) + (-8) =?
20. Solve: (-8) - (+9) =?
21. Solve: (+7) × (-9) =?
22. Solve: (-10) - (-10)=?​