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Any number that is not zero is significant. However, zeros that appear between non-zeros are significant. Even more confusing is that leading zeros are not significant while trailing zeros are. So, it really depends on what you are looking at. And where the zeros are.
3 significant figures..the zeros are non-significant
When it is between non-zero digits, e.g.: 504 or 2005When there is one or more zeros after the last non-zero digit AFTER the decimal point, e.g.: 3.40 When there are zeros after the last non-zero digit in a whole number, one or more zeros MAY be significant, e.g.: 500. But if you have to guess, you should consider such zeros to be non-significant.
Yes.
Only one of them is significant. The leading zero (zero to the left) is not significant. The trailing zero (rightmost) is significant. To recap, only the zero following the seven is significant. See the related links for a really good article on significant digits.