Identify which of the following is an
arithmetic sequence then find each
common difference.
1. 1, 4, 7, 10, ...
2. 2.-10, 50, -250, ...
3. 2, 6, 10, 14, ...
4. 7, 12, 17, 22, ...
5. 1, 3, 9, 27, ...
6. 9, 12, 15, 18,...
7. 5, 10, 20, 40, ...
8. 3, 12, 48, 192, ...
9. 4, 11, 18, 25, ...
10.1, 4, 16, 64, ...
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