it could be 2 or 3 or 4
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5,100 in 3 significant figures is still 5,100.
3 in A+
All of the digits are significant:Any digit after the decimal point is significant.A zero is significant if it comes between other significant digits.
Every digit in 40.725 is significant, so there are 5
It has 4. Every 0 after a decimal and after a significant digit is significant.