Answer:
11. 30, 39, 48 d= 9
12. -7, -12, -17 d= -5
13. 26, 33, 40 d= 7
14. 29, 38, 47 d= 9
15. 4, 0, -4 d= -4
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Answers & Comments
Answer:
11. 30, 39, 48 d= 9
12. -7, -12, -17 d= -5
13. 26, 33, 40 d= 7
14. 29, 38, 47 d= 9
15. 4, 0, -4 d= -4