Consider this sequence: -81.-54, 36, -24.... The sequence is The common ratio of the sequence is The sum of the first five terms of the sequence is

Question

asked Jul 11, 2020 39.8k views

2 Answers

Lkolbly · Answer 1 · 2020-07-18T05:18:34+0000

Answer:

See below in bold.

Explanation:

It looks like the third term should be -36.

The sequence is geometric.

The common ratio is -54/-81 = -36/-54 = -24/-36 = 2/3 .

The sum of the first 5 terms is

(-81) * (1 - (2/3)^5) / (1 - 2/3)

= -81 * 211/243 * 3

= -211.