There is not enough information in the question to answer the question. It depends on what happens in the ellipsis. If the number of fours keeps increasing forever then it is not a rational number, but if it settles at three 4s, or goes one 4, two 4s, three 4s (and maybe four 4s, five 4s) and then back to one 4 then it is.
yes
Yes.
yes
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.
It is a rational number. It can be written as a fraction.
yes
Is 12.05 a rational number or irrational number?
1.96 is a rational number
It is a rational number, as it can be written as a fraction.
Yes, the sum is always rational.
There is no such thing as a number that is both rational and irrational. By definition, every number is either rational or irrational.
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, it is.
It is a rational number.
10.01 is a rational number
Since it can be written as a fraction (9.0 = 90/10), then it 9.0 is a rational number.