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The rules for significant figures basically is used to weed out any unnecessary zeros in a number. For example: 31.0100, where the last 2 zeros aren't needed. The answer is E.
The best and most correct answer among the choices provided by your question is the third choice or letter C. When we subtract 15.54 from 508.9538 using the rules for significant figures, the answer would be 493.41.

The rule for adding and subtracting numbers is that the lowest decimal places should be followed for the answer to be in a significant figure.


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