Question

What is the common ratio of this geometric sequence?
1 80
2 40
3 20
4 10
5 5
A. -40
B. 0.5
C. 2
D. 40

Answer 1

common ratio = (second term)/(first term) = 40/80 = 1/2 = 0.5

this means you multiply each term by 0.5 to get the next term

Answer 2

80 times 0.5 = 40

40 times 0.5 = 20

etc etc