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OpenStudy (anonymous):
Find the indicated sum for the arithmetic series. S16 for 12 + 7 + 2 + (-3) + ...
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OpenStudy (cwrw238):
what is the common difference for this series?
OpenStudy (anonymous):
5
OpenStudy (cwrw238):
not quite - notice that the numbers decrease
OpenStudy (anonymous):
-5?
OpenStudy (cwrw238):
yes and Sn = (n/2)[2a1 + (n-1)d] where n = no. of terms, a1 = first term and d = common difference
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OpenStudy (cwrw238):
so pug in your values and work it out
OpenStudy (cwrw238):
* plug
OpenStudy (anonymous):
Thank yoou (:
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