Irrational.
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It is a rational number because it can be expressed as an improper fraction in the form of -80/1
No, it is neither rational nor irrational. It is a complex number.
The negative square root of 49 is -7. -7 is whole, integer, and rational number. It's not a natural or irrational number.
Neither. (It is a complex number.)
It is all of them except for irrational.