The answer depends on what you mean by a mixed number. A mixed fraction, for example, is always a rational number - without exception.
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Because they can be expressed as a fraction
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.
A mixed number is either less than -1 or greater than +1.
8.57 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its equivalent, in rational form, is 857/100. You can simplify this rational fraction if you require. As a mixed number, it is 8 57/100.
no but if you are not considering 1/pi or any other irrational number then the answer is yes