SOLUTION: I need help. Really don't understand this. Choose the correct eighth term of the sequence A(n)=1/2(-3)^(n-1). Then there's: A)364.5 B)-1093.5 C)-121.5 D)3280.5 Can I have somewh

Algebra ->  Sequences-and-series -> SOLUTION: I need help. Really don't understand this. Choose the correct eighth term of the sequence A(n)=1/2(-3)^(n-1). Then there's: A)364.5 B)-1093.5 C)-121.5 D)3280.5 Can I have somewh      Log On


   

Question 881022: I need help. Really don't understand this.
Choose the correct eighth term of the sequence A(n)=1/2(-3)^(n-1).
Then there's: A)364.5 B)-1093.5 C)-121.5 D)3280.5
Can I have somewhat of an example on how to do this? Please?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
A%28n%29+=+%281%2F2%29%28-3%29%5E%28n-1%29

A%288%29+=+%281%2F2%29%28-3%29%5E%288-1%29 Plug in n+=+8

A%288%29+=+%281%2F2%29%28-3%29%5E7

A%288%29+=+%281%2F2%29%28-2187%29

A%288%29+=+-1093.5 So it's choice B)