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There are infinitely many rational numbers between them.

One example is 9.00000000000246064000000002

Q: What is a rational number between 9 and 9.1?

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Both of them are rational numbers

Yes. Any rational number divided by another rational number is also rational.

41/9 is a rational number because all fractions are rational numbers

If you mean 4/9 as a fraction then it is a rational number

The square root of 91 is between 9 and 10

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Both of them are rational numbers

An infinite number

Rational. A rational number, z, is any number that can represented in the formx/y = z

There are an infinite number of rational numbers between any two rational numbers. And 2 and 7 are rational numbers. Here's an example. Take 2 and 7 and find the number halfway between them: (2 + 7)/2 = 9/2, which is rational. Then you can take 9/2 and 2 and find a rational number halfway: 2 + 9/2 = 13/2, then divide by 2 = 13/4. No matter how close the rational numbers become, you can add them together and divide by 2, and the new number will be rational, and be in between the other 2.

9 is a rational number

It would depend on where you put the parentheses. 7/9 - 9 is a rational number 7/(9-9) is not even a number at all - surely not a rational number.

Yes. Any rational number divided by another rational number is also rational.

-9 is a rational number

9 is a rational number

97 is a rational number.

It is a whole number so it is rational.

It is 9, though if you must have it in the form of a ratio, you could try 9/1.