Question

Which sequences are geometric? Select three options.

–2.7, –9, –30, –100, ...
–1, 2.5, –6.25, 15.625, ...
9.1, 9.2, 9.3, 9.4, ...
8, 0.8, 0.08, 0.008, ...
4, –4, –12, –20, ...

Answer 1

The geometric sequences are:

- –2.7, –9, –30, –100, ... (common ratio 10/3)
- –1, 2.5, –6.25, 15.625, ... (common ratio −2.5)
- 8, 0.8, 0.08, 0.008, ... (common ratio 0.1)