Rational numbers are those that can be expressed as a ratio of two integers. So 2, which can be expressed in such a way, for example, (-2) / 1 or 2 / (-1) is a rational number.
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No, they can be rational or irrational. The sign of a number has nothing to do with it.
No, it is an imaginary number which is a complex number.
No.
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No.