Natural (counting) numbers; integers; rational numbers; real numbers; complex numbers. And any other set that you choose to define, that happens to include the number 4 - for example, the set of square numbers, or even numbers, the set of the numbers {3, 4, 5, 7, 14, 48}, etc, the set of numbers containing the letter o in their English name.
Chat with our AI personalities
4 belongs to any set that contains it. So {1, pi, 4, -37.5689, sqrt(2)} is a possible answer.
Irrational numbers.
mixed numbers
composite
It belongs to any set that contains it!It belongs to {-4},or {-4, sqrt(2), pi, -3/7},or all whole numbers between -43 and 53,or multiples of 2,or even numbers,or composite numbers,or integers,or rational numbers,or negative rational numbers,or real numbers,or complex numbers,etc.