Posted by Joe on Wednesday, July 27, 2011 at 6:25pm.
A ball is dropped from a height of 20 ft and always rebounds 1/4 of the distance fallen.
A. write a sequence for the first 3 rebound heights
B. How high is the 6th rebound?
C. Find the sum of all possible rebounds.
I keep getting numbers that are too high. I don't think I have the correct geometric sequence.

PreCalc  Sequence  Anonymous, Wednesday, July 27, 2011 at 8:53pm
1st rebound 20*1/4
2nd 20*(1/4)^2
3rd 20*(1/4)^3
6th 20*(1/4)^6
The sum=20*(1/4+(1/4)^2+(1/4)^3+...)=
20*(1/4)/(11/4)=20/3