The number -18 does not belong to the subset of irrational numbers.
To clarify:
- Rational numbers are numbers that can be expressed as a fraction of two integers (e.g., -18 can be written as \(-18/1\)).
- Integers are whole numbers that can be positive, negative, or zero (e.g., -18 is an integer).
- Irrational numbers are numbers that cannot be expressed as a simple fraction, such as \(\sqrt{2}\) or \(\pi\).
Since -18 can be expressed as a fraction and is a whole number, it does not belong to the subset of irrational numbers.
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