Maths homework, can't do it
Can someone PLEASE give me the answer to the nth term of these:
1) 9, 12, 17, 24, 33, 44
2) -4, -1, 4, 11, 20, 31
3) -3, 3, 13, 27, 45, 67
4) 0, 3, 8, 15, 24, 35
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