[ngreen]

Yeah the addition one are wrong.

Answers:

1. 1317.47 , 6 sig figs
2. 120 , 2 sig figs
3. 1.4 , 2 sig figs
4. 30.8 , 3 sig figs
5. 7.2, 2 sig figs
6. 4.9, 2 sig figs

For addition the sig figs are determined by the least amount of decimal places.
For multiplication they are determined by term with lowest amount of sig figs.