89999
All 5 of them
All of the digits are significant digits in this case. A zero between other (non-zero) digits is considered significant.
Just one, the first 5. * * * * * No. All three digits are significant.
5 digits
4*5*5*5 = 500
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.
There are three digits: 4, 5, and 1.
99999
3 to 5 digits
There are 4 digits in 1024