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OpenStudy (rainbow_dash):
Find the sum of the given arithmetic series. 26 + 19 + 12 + 5 + ... + (–37)
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OpenStudy (lgbasallote):
find the number of terms first
OpenStudy (rainbow_dash):
10 terms
OpenStudy (lgbasallote):
starting from 26?
OpenStudy (lgbasallote):
right 10 terms
OpenStudy (lgbasallote):
\[\huge S_n = \frac{n(a_1 + a_n)}{2}\] you know what to do
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OpenStudy (rainbow_dash):
alright thanks
OpenStudy (lgbasallote):
welcome
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