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, ...

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**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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