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

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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)   (Show Source): You can put this solution on YOUR website!
Using the formula given:
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