Question

Which number sentence shows the associative property of addition? Choose all that apply.

3z + 9p = 9p + 3z
3x (5 + 2) = 3x (5) + 3x (2)
3 + (2 + 8) = (3 + 2) + 8
(6 + 1) + 9 = 6 + (1 + 9)

Answer 1

third one..

Answer 2

3 + (2 + 8) = (3 + 2) + 8
(6 + 1) + 9 = 6 + (1 + 9)

Answer 3

Read this: http://www.mathsisfun.com/associative-commutative-distributive.html

Answer 4

Thanks @shamil98 and @wangkan07

Answer 5

medal?