activity1. which of the following is an arithmetic sequence? mark check if it is an arithmetic sequence and X if it is not on the space provided before the number.
1. 5, 10, 15, 20,
2. 4 7 10 13
3. 4, 9, 14, 19
4. 10, 5, 0, -5, -10, -15
5. 3, 6, 12, 24,
6. 1, 2, 4, 8, 16, 32
7. 1, ½, ⅓, ¼,
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