Rational
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-23 is rational.It is rational because we can write it as a fraction (one integer divided by another) where the denominator is not equal to 0. For example, -23/1. This makes it rational.
No. Square root of 23 is irrational.
Rational numbers can be written in the ratio p/q where p and q are integers and q is not zero. 5.75 can be written as 575/100 or 23/4 in its simplest form. Since 23 and 4 are integers and 4 is not zero, 23/4 is rational.
Yes.
They need not be. You can have sqrt(23)% which would be irrational.