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OpenStudy (anonymous):
Find the sum of the first 5 terms of the geometric sequence 5, 15, 45, 135
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OpenStudy (anonymous):
do you have choices
OpenStudy (anonymous):
no:(
OpenStudy (texaschic101):
In a geometric sequence, you find the next number by multiplying. So 5 x what is 15 ? 15 x what is 45 ? We need to find the common ratio
OpenStudy (anonymous):
so its 3?
OpenStudy (anonymous):
its 405
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OpenStudy (texaschic101):
3 is the common ratio. So to find the next number, you multiply by 3. The next number would be 135 x 3 ?
OpenStudy (texaschic101):
yes...its 405
OpenStudy (texaschic101):
and if you needed the next number, it would be 405 x 3
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