Answer:
21. -37
22. 0
23. -16
24. 60
25. 12
26. -23
27. I do not know
28. 12
29. I do not know
30. -5
Explanation:
(21) -57 (22) -58
(23) -16 (24) 60
(25) -76 (26) -23
(27) 21 (28) 8
(29) 3 (30) 21
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