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The format 9-9 indicates that you want to extract the 9th root of 9.

9-9= 2.58 x 10-9 or in non-scientific notation 0.00000000258

Extending the precision of the value in the scientific notation beyond 2.58 is not warrentedas the accuracy expressed in the question is only 9 not 9.00 or better

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16y ago

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