Question

Look at the following sequence. 128, 320, 800, 2000, . . . If it is a geometric sequence, choose the common ratio. If it is not a geometric sequence, choose “not geometric.” 4 not geometric 2.5 1200

Answer 1

2.5!!

Explanation:

100% correct

Answer 2

It is a geometric sequence en the common ratio is:
`r=(5)/(2)`.

Explanation:

1. By definition, a geometric sequence is a sequence in which you obtain a term by multiplying the previous one by a common ratio.

2. The common ratio is obtained by dividing a term by its preceding term.

3. Keeping this on mind, you have:

`(320)/(128)=(5)/(2)\\`

`(800)/(320)=(5)/(2)`

`(2000)/(800)=(5)/(2)`

4. As you can see, the common ratio is
`(5)/(2)`