4
Four.
4 of them.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
4
Four
5.
There are 5 significant figures (number) in 0.00909.
7.405 has four significant figures.
7.107 has four significant figures.
There are four significant figures in the number 5280.
There is one significant digit in the number 10, as written.