10 significant figures.
0.0310 has 3 significant figures.
3
4
10800 meters has 3 significant figures.
2 of them.
4 significant figures.
10 significant figures.
3 significant figures.
It has five significant figures.
7 significant figures.
3 significant figures.
There are 5 significant figures.
Two significant figures.
Four significant figures.
Four significant figures.
Three significant figures.