Which sets of numbers represent geometric sequences? check all that apply.

2/5,2/10,2/20,2/

11/12,8/12,5/12,2/12

25, 19, 13, 7,

4, 12, 36, 108,

–5, 5, –5, 5,

–3, 0, 3, 6,

–8, –2,1/2.1/

2/5,2/10,2/20,2/40...

4, 12, 36, 108, ...

–5, 5, –5, 5, ...

Step-by-step explanation:

These 3 sets represent a geometric sequence.

A geometric sequence is a series of numbers where each number is obtained by MULTIPLYING the same fixed number to the previous number.

So, in the first sequence: 2/5,2/10,2/20,2/40...

The multiplying factor is 1/2.

In the second sequence: 4, 12, 36, 108, ...

The multiplying factor is 3

In the 3rd sequence: –5, 5, –5, 5, ...

The multiplying factor is -1.

Most of the other sequences are not geometric sequences, but arithmetic sequences (where the next term is obtained by ADDITION).

$8

step-by-step explanation:

it is pretty much backwards.

you take the 4x2 multiply that, and that is = $8