Find the common ratio ‘r’ for each geometric sequence and use ‘r’ to find the next three terms. (Please show work. Also, you don’t have to answer all)

1. 5, 15, 45, 135...

2. -2, 6, -18, 54...

3. 4, 20, 100, 500,...

4. 8, 4, 2, 1,...

5. 72, -36, 18, -9,...

6. 200, -80, 32, -12.8,...

7. 10, 30, 90, 270,...

8. 5, 3, 1.8, 1.08,...