To any set that contains it!
It belongs to {-5},
or {45, sqrt(2), -5, pi, -3/7},
or all whole numbers between -43 and 53,
or multiples of 5,
or integers,
or rational numbers,
or real numbers,
etc.
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Irrational Numbers, Rational Numbers, Integers, Whole numbers, Natural numbers
It belongs to the rational numbers which is a subset of the real numbers. The reals, in turn, is a subset of complex numbers.
Yes.
The subset consisting of the one number, 7.5 : {7.5}
No. Natural numbers are a very small subset of real numbers.