Question

write and explicit formula for the geometric sequence
25,5,1,1/5

Answer 1

i know An=A*r^n-1

Answer 2

@whpalmer4

Answer 3

The ratio is 1/5.
r = ratio
and you are given the first term
(which is A)
so
\[A_n = 25 * (\frac{ 1 }{ 5 })^{n-1}\]

Answer 4

wow can you explain that alittle more.. your really smart and still alittle lost @shamil98

Answer 5

im still alittle lost lol

Answer 6

The formula is
\[A_n = A_1 * r^{n-1}\]
Right?

Answer 7

So you are given the first four terms

Answer 8

yes i just got it i had to work it out on my calculator. thank you for your help i get it.

Answer 9

Okay