8 plus 7 is 15. 15 plus 6 is 21. :)
6 plus 7 plus 8 equals 6 plus 8 plus 7, what property is that?That is the associative property.
If you mean: 6*(7+8)*(6+7)+8 then it works out as 1178
-6 + -7 + -8 = -21
4 + 5 + 6 + 7 + 8 + 9 = 39
9 + 8 + 7 + 6 + 5 + 4 = 39
2 + 4 + 8 + 6 + 3 + 7 + 9 + 8 = 47
No, it is the commutative (or Abelian) property. The associative property says that (6 + 7) + 8 = 6 + (7 + 8) and so either can be written as 6 + 7 + 8
It is: 62+8-7-6 = 57
1 + 1 + 6 = 8
9 + 8 + 7 + 6 + 5 + 4 + 3 = 42
8
2 + 5 is 7 + 6 =13 + 7 = 20 + 8 = 28 + 9 = 37 + 10 is 47.