Well, honey, a rational number is any number that can be expressed as a fraction where the numerator and denominator are both integers. So, if you can write 3.95 as a fraction (like 395/100), then yes, it's a rational number. But if you're too lazy to do the math, just remember that rational numbers include decimals that either terminate or repeat.
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Yes.
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It must be a generalised rational number. Otherwise, if you select a rational number to multiply, then you will only prove it for that number.
Yes. Any rational number divided by another rational number is also rational.