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Take the average of the two. The average of two rational numbers is (a) rational, and (b) between the two numbers.
Yes. For example, if you take any truncated equivalent of pi then it will be rational.
Yes. Take the average of the two numbers. Since those two numbers are rational, their average will also be rational.
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.
Well, let's take a moment to appreciate the number 94. It is a rational number because it can be expressed as a simple fraction, in this case, 94/1. Remember, every number is special in its own way, just like every brushstroke adds beauty to a painting.