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Match each item in Column A to an answer in Column B.

1.

What property is shown by the equation?
Column A Column B
1.
(34 + 11) + 9 = (11 + 34) + 9
2.
25 + (–15 + 4) = (25 + (–15)) + 4
3.
–(–21 + 8) = 21 + (–8)
4.
–30 + (–16) = –16 + (–30)
A.
commutative property
B.
associative property
C.
opposite of a sum property. I will give medal to the person who replys the best