Any set that contains it! It belongs to {0}, or {45, sqrt(2), 0, pi, -3/7}, or all whole numbers between -43 and 53,
or multiples of 5, or integers,
or rational numbers, or rational numbers smaller than 6.3,or real numbers,
or complex numbers, etc.
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negative 8
No, they are disjoint sets. Both are subsets of the Real numbers.
Not necessarily. There are series over all kinds of subsets and supersets of the set of real numbers.
The two main DISJOINT subsets of the Real numbers are the rational numbers and the irrational numbers.
It would be a bit stupid to call a system the real number system if real numbers were not a part of it!