Answer:
First, find the common ratio
400/500=0.8
r=0.8
f(8)=f(1)r^n-1
f(8)=500(.8)^8-1
f(8)=500(.8)^7
f(8)=104.86
Explanation:
104.8576
I’m doing this to so I’m not sure but if you find the common ratio I got 4/5 you then multiply it by 320 to get f(4) then multiply 4/5 by the next number until you hit 8. Once I did that I got 104.8576.
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