Question

Which of the following is the formula for the geometric sequence? 320, 80, 20, 5,...

Answer 1

Give the answer

Answer 2

320 time 1/4 gives 80 times 1/4 gives 20
ratio=1/4
intial value = a
summation: sigma a / 1-r = 320/.75

Answer 3

or if you want terms,
1/4b = c
1/4c = d etc..

Answer 4

hope that helps!