I think this is right, but I’m not certain what it means by 3 significant figures AND 3 decimal places, so I just did it to 3 significant figures:
1. 2.78
2. 0.157
3. 3.21
4. 0.073
5. 0.150
6. 0.020
7. 0.781
8. 3.30
9. 254
10. 0.000926
11. 7.82
12. 0.00964
Please mark brainliest if correct