math properties part 2

Match it! Select the correct answer from the pull down...Good luck!

x + ( y + z ) = ( x + y ) + z

-3 x -7 = -7 x -3

-2 ( 1 + 5 ) = -2 + -10

2- ( 5 x 1 ) = 2 x 5 x 2 -1

4hj = 4jh

9 - 7 = 7 - 9

6 - 9 - 3 = 3 - 9 -6

12x1= 12