It is the associative property for the addition of numbers.
Tautology?
12+8+10+12+11+9 = 62
If there is an equals sign after the first 8, the answer is yes.
Commutatitivity or the Abelian property
Yes. By the associative property, a + b + c = a + c + b.
-5
It is: 12-8+5 = 9
It is (12*8)/(9+1) = 9.6
9/12 + 3/8 = 6/8 + 3/8 = 9/8 or 11/8
True. Addition of natural numbers obeys associative and commutative property.
48
4/9 + 8/9 = 12/9 = 4/3