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OpenStudy (anonymous):
HEEEELPPP!!! Find the sum for the geometric series. S7 for 972 + 324 + 108 + ...
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Directrix (directrix):
What is this: S7 ? Do you want the sum of 7 terms?
OpenStudy (anonymous):
It says to find the indicated sum for just S7....
OpenStudy (anonymous):
The answer on the book is 4372/3
Directrix (directrix):
We'll need the formula to find the first 7 terms of the series. Do you know it?
Directrix (directrix):
972 + 324 + 108 + ... Each term is the previous term divided by 3 so you could just write out the first seven terms and add them.
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OpenStudy (anonymous):
|dw:1387254125417:dw|
Directrix (directrix):
What is the value of r in this problem?
OpenStudy (anonymous):
1/3
OpenStudy (anonymous):
a = 972 , r = 1/3 , n = 7
Directrix (directrix):
We need to crank this out: |dw:1387254102267:dw|
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