Question

Which best describes the relationship between the successive terms in the sequence shown?

2.4, –4.8, 9.6, –19.2

The common difference is –7.2.
The common difference is –2.4.
The common ratio is –2.0.
The common ratio is –0.5.

Answer 1

The common ratio is −2.0.

Each term is obtained by multiplying the previous term by −2 (2.4×−2 = −4.8, −4.8×−2 = 9.6, etc.).