No, it is rational.
-9 is a rational number
It is all of them except for irrational.
If it says "negative irrational", then obviously it is irrational.
If you have any positive irrational number, then its negative is also irrational.
Irrational
Not necessarily. Irrational numbers can be negative or positive.
No, the cube root of -9 is an irrational number.
A negative irrational number can be thought of as an irrational number multiplied by -1, or an irrational number with a minus sign in front of it.
The negative of a rational number is also rational.
Not necessarily. Negatives can be rational or irrational - each one is the same as its positive counterpart.
No. Irrational and rational numbers can be non-negative.
Oh, dude, negative square roots are actually considered irrational numbers. I know, right? It's like, they're not rational because they can't be expressed as a simple fraction. So yeah, negative square roots are definitely in the irrational club. Cool, right?