Yes. 0 is the only number that is neither a positive number nor a negative number.
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Yes. In general, real numbers include negative numbers; they also include numbers that have decimals.
It is false. It does not include negative fractional numbers.
Yes, real numbers include both positive and negative numbers. They also include whole numbers and fractional numbers, as well as irrational numbers (numbers that can't be expressed as the ratio of two whole numbers).
Yes. Real numbers include positive and negative numbers, integers and fractions, rational and irrational numbers.
Yes. ...-3,-2,-1,0,1,2,3... are all whole numbers. Whole numbers are any numbers that aren't a fraction and that includes negative numbers.