Q: Is the square root of -9 a rational number?

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The square root of 9 is 3 which is rational.

The square root of 9 is 3 which is a rational number

It is rational.The square root of 9 is 3 and it is a rational number

Yes. The square root of 81 is 9, which is a rational number.

The square root of 9 is rational.

The square root of 81 is 9 which is a rational number

The square root of 9 is 3 which is a rational number

It is none of those because the square root of -9 is an imaginary number but the square root of 9 is 3 which is a rational integer or whole number

Yes 3 is a rational number

The square root of 9 is 3 which is a rational number

yes

Yes, because the answer is 3/2 which is a rational number.

No. The square root of 81 is 9, which is a rational number.

Because 9 is a perfect square - which means that its square root is an integer. 3 is not a perfect square.

The square root of 9/16 is 3/4 which is a rational number

Yes. It's +9 and -9. They're both rational.

Yes. The square root of 81 is 9 - a natural number and all natural numbers are rational numbers.

Yes.

The square root of any perfect square, or a ratio of perfect squares. eg sqrt(9/25) = 3/5, is rational.

It could be either. For example, √9 is a rational number, whereas √2 is not.

Yes: the square root of 9 is 3.

It depends. If a number is a perfect square or a ratio of perfect squares then its square root is rational. If not, the square root is irrational.For example,Consider 9/4. Since 9 and 4 are both perfect squares, the square root of their ratio is rational. sqrt(9/4) = 3/2 or 1.5. But this is less obvious if the number is presented to you as sqrt(2.25)

square root of 9 = 3 but 2, 17 and 23 are irrational numbers

It is not a real number.

No, in fact unless an integer has an integral square root, the square root is always irrational. Note that some rational fractions can have rational square roots, though. Example: sqrt(4/9) = sqrt(4)/sqrt(9) = 2/3, which is rational. Or sqrt(9/16) = 3/4