Hello.
A rational number can be expressed as a fraction.
Let's check if we can express the given numbers as fractions.
The first number is √5.
Can we express √5 as a fraction? No.
Why? Because √5=2.236...
We cannot express this number as a fraction.
Thus, √5 is irrational.
Let's check the other 3 numbers.
The second number is -2.
Can we express -2 as a fraction? Sure!
[tex]\displaystyle-\frac{2}{1}[/tex]
Thus, -2 is rational.
What about the third number?
Well, it's already a fraction.
Seems like Option A is the right option, huh? Well, let's check the last one as well.
The last one is √9.
9 does have a square root, unlike 5.
It equals 3:
√9=3
Let's express 3 as a fraction:
[tex]\displaystyle\frac{3}{1}[/tex]
Therefore, Option A is the right option ;)
I hope it helps.
Have a great day.
[tex]\boxed{imperturbability}[/tex]
