To any set that contains it!
It belongs to {14},
or {14, sqrt(2), pi, -3/7},
or all whole numbers between 3 and 53,
or multiples of 7,
or composite numbers,
or counting numbers,
or integers,
or rational numbers,
or real numbers,
etc.
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No because natural numbers are a subset of real numbers
Integers are a subset of rational numbers which are a subset of real numbers which are a subset of complex numbers ...
The complex numbers.
It belongs to any set that contains it: for example, {4.75, -12, pi, sqrt(5), 29}. It belongs to the set of integers which is a proper subset of rational numbers which is a proper subset of real numbers which is a proper subset of complex numbers. So -12 belongs to all the above sets.
No. But all whole numbers are in the set of rational numbers. Natural numbers (ℕ) are a subset of Integers (ℤ), which are a subset of Rational numbers (ℚ), which are a subset of Real numbers (ℝ),which is a subset of the Complex numbers (ℂ).