Yes. Real numbers can be added, subtracted , multiplied and divided by nonzero numbers in an ordered way. x, for example, is not a real number.
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Practically all numbers are real numbers. ten is one of them
No. In general, the square root of a negative number is an imaginary number, which is not a real number.
No, it is not, because real numbers include negative numbers. The square root of a negative number is an imaginary number
It is a negative integer, a negative rational integer, a negative real number.
A negative number times a negative number gives you a POSITIVE number, not a negative number.