This is the fundamental zero additive rule
x - 0 = x
which means that for the set of real numbers, there exist a number such that if added (or subtracted) from any other will not affect such number.
4th option is correct.
look at the picture i sent
-(-2)^4 = 16
The - sign multiplies inside the bracket to a positive, 2^4 = 16
I uploaded the answer to a file hosting. Here's link:
tinyurl.com/wpazsebu
