What property is shown by the equation?





Column A



Column B









--- ABC

1. 
   
   
   

(34 + 11) + 9 = (11 + 34) + 9






--- ABC

1. 
   
   
   

25 + (–15 + 4) = (25 + (–15)) + 4






--- ABC

1. 
   
   
   

–(–21 + 8) = 21 + (–8)






--- ABC

1. 
   
   
   

–30 + (–16) = –16 + (–30)

A

commutative property

B

associative property

C

opposite of a sum property