18
18-(-16) = 34
34 - 64/4 = 34 - 16 = 18 (remember that division takes precedence over subtraction).
-4 minus -34 is 30
-34 minus -20 is -14
-3
34 divided by 4 then minus 2 is 6.5.
34 - 56 = -22
34 - 67 = -33
It is: 2012 minus 34 = 1978
81 minus 34 divided by 2 = 64.
You seem to be unaware of the fact that you could have obtained the answer much more easily and quickly by using the calculator that comes as part of your computer. And you may even learn something! The answer is 34.
34