Rational
Yes. Any rational number divided by another rational number is also rational.
4.8
41/9 is a rational number because all fractions are rational numbers
Any addition, subtraction, multiplication, or division of rational numbers gives you a rational result. You can consider 8 over 9 as the division of 8 by 9, so the result is rational.
Yes, it is.
Yes.
Yes
No. 9/46 is an irrational number as it has no definite end.
489 is an integer, and so there is not a sensible way of representing it as a mixed number.
Yes.
Yes.