-6
18 + 16 = 34
The Answer is Commutative Property
9 + 8 + 16 + 17 + 18 = 68
18
-a + 2 = 18 - 2 = - 2 --------------- - a = 16 a = - 16
18 + (-6) = 12
2+14=16
It is so very quick and simple to obtain the answer. All that is required is to use the calculator - IF you need one - which is available on your computer. But since you are clearly unable to use the calculator, the answer is 80.
60.
1