14 + 18 = 18 + 14 demonstrates the commutative property (of addition).
4
-4
The answer is 44
17 + 14 + 17 + 19 + 18 + 13 + 11 = 109
32+14+20+18+16+31+21+16=168
80
2 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20 = 106
-14
-14
That's a total of 44
They all add up to 70