Simplify the radicals.
2. √25 =

3. √121 =

4. √169 =

5. √225 =

6. √8

7. √64 3
=

8. √64 =

9. √400 =

10. √1000 3
=

11.√100 =

12.√49 =

13.√−16 =

14. √−8
3
=

15. √−216 3
=

16. √27 3
=

17. √−343 3
=

18. √−1
3
=

19.√−36 =

20.√0 =