Yes because it can't be expressed as a fraction.
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sqrt(18) = 3*sqrt(2) is an irrational number.
It is irrational.
Yes. It would be 21/2 * 91/2, or "three root two". Root two is an irrational number, so it's products - such as root 18, will be as well.
As √10 is irrational, 18 + √10 is irrational.
Sqrt(18/2) =Sqrt(9) =3 which is rational.