5.29
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1.55555555555555
5.5555555... you can see this because 5/9 is 5 ninths, so 5.5/9.9 is 5 ninths, so 5.55/9.99 is 5 ninths, so 5.5555... / 9.999... is 5 ninths, but 9.99999999... = 10, so 5.5555555.../10 is 5 ninths.
It is -2.
Yes
5 ninths. (5/9)