No, it cannot. The product of a rational and irrational is always irrational. And half a number is equivalent to multiplication by 0.5
no
The sum of the three can be rational or irrational.
The square root of nine is three, and that is not an irrational number.
No, it is rational.
No, it is rational.
Integers are rational. In the set of real numbers, every number is either rational or irrational; a number can't be both or neither.
Because 3 is a prime number and as such its square root is irrational
no
Yes.
no
No. It can be written as a fraction, so it is rational.