For the geometric sequence, find the common ratio, r.
-2, 0.8, 0.32, 0.128, . . .
A)4
B)0.04
C)0.4
D)0.8

Question

Quizplus · Accepted Answer

To find the common ratio, we divide any term in the sequence by the previous term. For example: 
0.8/2 = 0.4 
0.32/0.8 = 0.4 
0.128/0.32 = 0.4 
So the common ratio is 0.4, which is Choice C. To find the common ratio, we divide any term by the previous term. For example, 0.8/2 = 0.4, 0.32/0.8 = 0.4, and so on. Therefore, the common ratio is 0.4, which is choice C.

For the Geometric Sequence, Find the Common Ratio, R