Yes, because the zero is between two other significant figures, it is significant.
3 significant figures.
6040 has 3 significant figures.
7 significant figures.
3 significant figures.
To 3 significant figures, it is -59.8.
3 significant figures.
3 significant figures.
3 significant figures.
It is then 3650 to 3 significant figures
9.999 to 3 significant figures is 10.00
34.02 to 3 significant figures is 34.0
12,345 to 3 significant figures is 12,300.