Yes, an number that can be written as a ratio of integers is rational.
.7 is 7/10
.71 is 71/100
.714 is 714/1000
.7142 is 7142/10000
etc.
Can you see how .7142857 must be rational?
However, if you allow the 7 at the end to repeat, then that changes things.
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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.