yeah ma.
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Yes.
The difference is that rational numbers can be expressed as fractions whereas irrational numbers can not be expressed as fractions.
It could be either.
No, it is always irrational.
The difference can be rational or irrational.5 + sqrt(3) and 2 + sqrt(3) are both irrational numbers but their difference is[5 + sqrt(3)] - [2 + sqrt(3)] = 3, which is rational.