4.
The trailing zero in the number in question (0.00120) is of no consequence: whether it exists or not, the value of the number does not change.
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Five. All nonzero digits are significant and zeros in between significant digits are always significant.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
There are 4 significant digits in 5600.
The answer is five. All the digits are significant.
There are three significant digits in 3.56.