SOLUTION: Find A sub n for this geometric sequence. a sub 1=2,400, r=1/4, n=7 I knew how to do this.. but now i am totally lost about finding a sub n.. I know the equation and stuf

Algebra ->  Sequences-and-series -> SOLUTION: Find A sub n for this geometric sequence. a sub 1=2,400, r=1/4, n=7 I knew how to do this.. but now i am totally lost about finding a sub n.. I know the equation and stuf      Log On


   

Question 491008: Find A sub n for this geometric sequence.
a sub 1=2,400, r=1/4, n=7
I knew how to do this.. but now i am totally lost about finding a sub n..
I know the equation and stuff----> An=A1 x r^n-1
but for some reason I can't figure it out....
help me please :)
Answer by ccs2011(207) About Me  (Show Source):
You can put this solution on YOUR website!
Using the formula given:
--> An+=+A1%2Ar%5E%28n-1%29
--> A7+=+2400%2A%281%2F4%29%5E6
--> A7+=+2400%2A%281%2F4%5E6%29
--> A7+=+2400%2F4%5E6
--> A7+=+0.5859