79,900
It has three significant figures.
3 significant figures
The answer is 9,513 moles carbon.
Three - all nonzero digits are not significant.
This number has 4 significant figures.
0.0034088 in three significant figures would be 0.00341
130
31,500
201
It is: 1040
21.3
0.990
0.00241
The number 10.989 rounded to 3 significant figures is 11.0
It's already there.
6.71 is 6.7050 is rounded to three significant figures.
2.540x10^4