All 5 of them
All of them.
All the digits are significant, so there are 5 significant digits.
Total number of digits = 5
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.
5 has 1 sig fig.
3 to 5 digits
There are 5 significant digits in 18.0140.
There are 4 digits in 1024
9
1