Which ones are arithmetic, geometric, or neither sequences?

1, 2 , 4 , 7
0, 2 , 4 , 6
-3, 0, 3, 6
6, 12, 24, 48
20, 22.5 ,25, 27.5
-4, 5, -6, 7
7, 9 , 12 , 14
18, 10 ,2 ,-6
100, 50, 25, 12.5
-1, 3, -9, 27

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