0
Wiki User
13
Valentina Reichel ∙
-36
13.
-5
5
-13
-9 + 4 = -5
-4 + 9 = 5
9 + 9 + 9 + 9 + 9 + 9 + 6 + 6 + 6 + 6 + 2 + 2 + 23 + 3 + 3 + 4 + 4 + 4 = 123
9 + 4 + 4 + 4 + 4 + 4 + 5 = 34
Yes because they all add up to 18
30! 29
Commutativity.
4 + 4 + 1 = 9
9 + 510 + 4 = 523
9 + 4 + 7 + 8 = 28
The additive property.