Posted by Neil on Wednesday, May 23, 2012 at 10:13pm.
Write a rule for the nth term of the geometric sequence. Then find a7.
1. 7, 4.2, 2.52, 1.512, ...

Math  MathMate, Wednesday, May 23, 2012 at 10:37pm
7, 4.2, 2.52, 1.512, ...
Divide successive terms,
4.2/7=0.6
2.52/4.2=0.6
1.512/2.52=0.6
So the common ratio is r=3/5
T(1)=7
T(n)=7r^n
T(7)=7(3/5)^7
=15309/78125
=0.196 approx.

Math  prustam, Thursday, May 24, 2012 at 12:53am
how do you
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