9 repeating = infinity.
If you mean 0.9999... repeating as a fraction, that is equal to 1.
Proof:
1/3 = 0.3 repeating (0.3333...)
2/3 = 0.6 repeating (0.6666...)
1/3 + 2/3 = 3/3 = 1
0.3333... + 0.6666... = 0.9999...
0.9999... = 1
End of Proof:
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1/9
Assuming you mean 0.81818181...repeating; the answer is 9/11.
23/9
It is: 88/9
*The trick with .1 repeating is it always will be divided by 9. 11.1 = 100/9