Helpanswer03viz
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11. 1 + (-1) = (-1) + 1 = 0

12. x + y = y + x

13. (x + y) + z = x + (y + z)

14. 10 (x + y) = 10x + 10y

15. X=X

16. If x=y then y = x

17. If x= y, then x + z = y + z

18. x (y + 2) = xy + xz

19. 7 • 4 = 4 • 7

20. 3 • (4 • 5) = (13 • 4) • 5​

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Prince7543viz

Answer:

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