**determine if the following sequences are arithmetic, find d, geometric,find r or neither.1. 0,-5,-10,-12,-20 2. 2,- 5,-12,-19,-26 3. 5,10,20,40,80**

**Answer:**

- The first one is neither an arithmetic progression nor a geometric progression.
- This is an arithmetic progression with d = -7.(You keep on adding -7 to get the next number)
- This is a geometric progression with r = 2(You keep on multiplying 2 to get the next number)