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OpenStudy (anonymous):
Help please??? Find S5 for the series -2 + -10 + -50 + -250 +...
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OpenStudy (anonymous):
what's the r?
OpenStudy (anonymous):
I think its 5?
OpenStudy (anonymous):
yes it is 5. you have the first 4 terms. What's the 5th?
OpenStudy (anonymous):
-1250?
OpenStudy (anonymous):
right. S5 is the first 5 terms added together
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OpenStudy (anonymous):
so is -1250 the answer? if not could you explain how to get it?
OpenStudy (anonymous):
-1250 is the first term. S5 means the sum of the first 5 terms, so S5 = -2 + -10 + -50 + -250 + -1250
OpenStudy (anonymous):
so I just need to add them together?
OpenStudy (anonymous):
yes
OpenStudy (anonymous):
okay I got -1562. Is that right?
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OpenStudy (anonymous):
yes
OpenStudy (anonymous):
Thank you <3
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