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solving perform the indicated operation .

1. 8 + (-12)
2. -6 + (-21)
3. -12 + (-8) + (6)
4. 8-- (-9)
5. -8 -- (-12)
6. -13 -- (-10) + (40)
8. -18 + (18) -- (-6)
9. -15(2)
10. 0(-17)
11. (-14)(-2)(-3)
12. -15 ÷ 3
13. 40 ÷ (-40)