14.5870
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31.5
The first 3 significant digits of a number are the first 3 digits starting from the left ignoring any leading zeros. So 31456 = 31500 (3 significant digits) The 5 in the "56" rounds the 4 up.
14.587020 rounded to four significant digits is 14.59
2.005
14.587020 has eight significant digits. If you were going to round it off to four, the answer would be 14.59