-42 is rational.
All integers are rational numbers as they can be expressed as the number over 1 which, being one integer over another integer, is the form of a rational number.
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Irrational.
No. A rational plus an irrational is always an irrational.
rational
It is always irrational.
The product of a rational and irrational number can be rational if the rational is 0. Otherwise it is always irrational.