4.212121... = 4 21/99 = 4 7/33
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-4.21 = -421/100 (as a mixed number) = -421/100 (as an improper fraction)
If that is repeating 2 then as an improper fraction it is 20/9 or 2 and 2/9 as a mixed number
9 and 7/11
If that is a terminating decimal, it is 2 535353/1000000 (as a mixed number) = 2535353/1000000 (as an improper fraction) If that is a repeating decimal 2.535353... with the 53 repeating, it is 2 53/99 = 251/99
There are infinitely many possible answers.Let A be any number such that 0 < A