What property is shown by the equation?
Column A
Column B
--- ABC
1.
(34 + 11) + 9 = (11 + 34) + 9
--- ABC
2.
25 + (–15 + 4) = (25 + (–15)) + 4
--- ABC
3.
–(–21 + 8) = 21 + (–8)
--- ABC
4.
–30 + (–16) = –16 + (–30)
A.
commutative property
B.
associative property
C.
opposite of a sum property