Hi!
The answer to your problem is A)0.0310 and D)1.01
A significant figure is any number that is not a stand-alone zero which means any zero in the middle of a sequence of numbers or at the end of a sequence of numbers is counted as significant, for example:
these zeros are significant (1, 2, 3, and 4 is significant as well)
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0000123004
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these zeros are nonsignificant
