Which sequences are geometric? Check all that apply.



–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, ...