yes
-1/9 is rational because it can be expressed as a fraction (ratio).
Yes.
It's rational. It's the ratio of -1 to 9 .
Yes.
Yes, it is.
Yes and it is 1/3
Yes.
9 is a rational number
9/16
41/9 is a rational number because all fractions are rational numbers
Rational
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.