Well, honey, a rational number is any number that can be expressed as a fraction where the numerator and denominator are integers and the denominator is not zero. So, if you can write 4.343434 as a fraction, then it's a rational number. Spoiler alert: you can write it as 4343434/1000000, so yes, 4.343434 is a rational number.
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Oh, dude, a rational number is any number that can be expressed as a fraction where the numerator and denominator are integers. So, if you can write 4.343434 as a fraction, then it's rational. And guess what? You can totally do that! Just express it as 433434/100000 and voilà, you've got yourself a rational number. Cool, right?
As much as, in these days of uncertainty, anything can be anything. As long as the constraints of a rational number are kept to, a rational number will always remain a rational number.
Yes.
Yes, but only if the rational number is 0.
Only if the rational number is 0.
A rational number which is an integer can be simplified to a form in which the denominator is 1. That is not possible for a rational number which is not an integer.