4.7 is already a rational number. If you mean as a mixed number, this is equal to 4 7/10 or four and seven tenths.
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The square root of 47 is an irrational number.
Yes.
It is a decimal representation of a negative rational number. It also belongs to any superset that contains the set of negative rational numbers.
Yes because if need be it can be expressed as a fraction in the form of 47/10
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.