**Station F Answers**

1. It is arithmetic because there is a common difference of 1.

2. It is geometric because there is a common ratio of -2.

3. It is neither because it does not have a common difference or a common ratio.

4. It is geometric because there is a common ratio of 3.

5. It is neither because it does not have a common difference or a common ratio.

6. It is arithmetic because there is a common difference of -4.

7. common diff. = 5; 29, 34, 39

8. common diff = -2; -13, -15, -17

9. common diff = -10; -28, -38, -48

10. common ratio = 10; 20,000, 200,000, 2,000,000

11. common ratio = 1/2; 5, 5/2, 5/4

12. common ratio = 1/3; 1/162, 1/486, 1/1458