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OpenStudy (anonymous):
algebra 2
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OpenStudy (anonymous):
OpenStudy (anonymous):
@agent0smith
OpenStudy (agent0smith):
Looks geometric. First: Find the common ratio by dividing a term by the one before it.
OpenStudy (anonymous):
what?
OpenStudy (anonymous):
ooooh
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OpenStudy (anonymous):
-4
OpenStudy (agent0smith):
Yep. S7 means you need the first 7 terms. Just keep multiplying by 4, till you have 7 terms (they already gave you four)
OpenStudy (anonymous):
ooooh
OpenStudy (anonymous):
okay, it's the first one
OpenStudy (agent0smith):
Then you just add or subtract them all together till you got the sum
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