Question

algerbra 1..questions and anwsers..help please.
If the sequence is geometric, what is the common ratio?
500, 100, 20, 4,...
5
125
1/5
not geometric
Which of the following is the formula for the geometric sequence?
2, 6, 18, 54, ...

an = 3(2)n-1
an = 2(4)n-1
an = 2(3)n-1
Which of the following is the formula for the geometric sequence?
320, 80, 20, 5,...

an = 320(1/4)n-1
an = 320(4)n-1
an = 4(320)n-1

Answer 1

1. 1/5

Answer 2

first
500/100=100/20=20/4=5
second
an = 2(3)n-1
third
an = 320(1/4)n-1

Answer 3

oh first is 1/5