Question

What is the common ratio of this geometric sequence? 5, 10, 20, 40, 80.
A. -40
B. 0.5
C. 2
D. 40

Answer 1

Note that multip. 10 by 2 results in 20; mult. 20 by 2 results in 40, and so on.  So the common ratio is 2.

Answer 2

Answer:

its -2

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