A. Determine whether the sequence is arithmetic or not. if it is, find the common difference and the next three terms.

1. 2, 5, 8, 11,...
2. 2, -4, 6, -8, 10,...
3. -6, -10, -14, -18,...
4. 40, 42, 44, -18,...
5. 1.2, 1.8, 2.4,...
6. 1, 5, 9, 13,...
7. 1/2, 1/3, 1/4, 1/5,...
8. √5, √6, √7, √8,...
9. 98, 95, 92, 89,...
10. 1, 4/3, 5/3, 2,...

B. find the term indicated in each of the following arithmetic sequences.

1. 2, 4, 6,...
2. 13, 16, 19, 22,...
3. 99, 88, 77, 66,...
4. 99, 87, 75, 63,...
5. 1/8, 1/4, 3/8, 1/2,...

15th term
25th term
18th term
12th term
20th term​