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Answer:
4. 16, 25
7. 49, 64
1. √4 = 2
8. √49=7
11. √121=11
16. √196=14
5. 23-16=7
12. 136-121=15
17. 220-196=24
2. 9-4=5
13. 144-121=23
18. 225-196=29
6. 4 4/5
9. 7 1/2
14. 11 3/5
19. 14 4/5
3. 2.83
10. 7.84
15. 11.66
20. 14.83