All rational numbers are those than can be expressed as one whole number over another.
3.87655 = 387655/100000 = 77531/2000 which is of this form, so it is a rational number.
The decimal representation of a rational number either terminated or ends with a repeating sequence of digits.
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No, 3.87655 is not a rational number. Rational numbers can be expressed as a fraction of two integers, but 3.87655 is a decimal that does not terminate or repeat, so it is an irrational number.
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.