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OpenStudy (anonymous):
find Sn for the given arithmetic series. a1=10, d=-9, n=15
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OpenStudy (anonymous):
what is the formula for s(n) ??
OpenStudy (anonymous):
idk :( but the answer choices are: 1020, -1590, -795, and -870
OpenStudy (lacypennelll):
here let me see if i can solve this
OpenStudy (anonymous):
okay :)
OpenStudy (anonymous):
if you dunno, then go study .. !! study what the formula is!
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OpenStudy (anonymous):
I never learned this though...
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