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Mathematics 7 Online
OpenStudy (anonymous):

find Sn for the given arithmetic series. a1=10, d=-9, n=15

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!

OpenStudy (anonymous):

I never learned this though...

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