Nothing those numbers don't exist
edit:
actually it may refer to the variation in a set of data. If, in a set of data, all the numbers are the same any calculations give will have an error of 0. Since the data is usually given in the form of mean plus minus error, it would be written as the number plus minus zero
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False - if the sentence is meant to be exhaustive. Integers can be positive or negative OR ZERO.
Zero is not negative. It is not positive either.Zero is not negative. It is not positive either.Zero is not negative. It is not positive either.Zero is not negative. It is not positive either.
Zero is neither positive or negative.
Neither. It is in between positive and negative but it is still an integer.
There can't be a negative zero. zero is neither negative nor positive.