true
Tautology?
144 9+7 = 16 and 9*16 = 144
9+8=17.
True. 9 + 8 + 1= 18 and 9 + 1 + 8 =18.
-13+4+(-8)= -9+(-8) = -9-8 = -17
Yes, it is true.
If there is an equals sign after the first 8, the answer is yes.
Commutatitivity or the Abelian property
Anton Heinrich Springer?
89
9 + 8 + 16 + 17 + 18 = 68