NEED HELP TO SOLVE A BET is there a negative zero

Zero is considered to  be a non-signed, even integer.....  thus,  " ± 0 "  is superfluous

no there is no such thing as -0

Actually, zero is neither a negative or a positive number. The 
 whole idea of positive and negative is defined in terms of zero. 
 Negative numbers are numbers that are smaller than zero, and 
 positive numbers are numbers that are bigger than zero. Since 
 zero isn't bigger or smaller than itself (just like you're not 
 older than yourself, or taller than yourself), zero is neither 
 positive nor negative.
 
 People sometimes talk about the "non-negative" numbers, and what 
 that means is all the numbers that aren't negative, in other words 
 all the positive numbers and zero. So the only difference between 
 the set of positive numbers and the set of non-negative numbers is 
 that zero isn't in the first set, but it is in the second. 
 Similarly, the "non-positive" numbers are the negative numbers 
 together with zero.

Source: http://mathforum.org/library/drmath/view/58735.html 

In theory.