Yes real numbers describes all the number is the world.
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-5 to a set number is -5
It is a real but an irrational number
It is a negative integer. It is a rational number, a real number.
Basically 1, 2, 3, 4, 5 are all real numbers, but as a real number doesn't only limit of integers, it can be 2/5, √2, or even π.
Yes.