SOLUTION: Find the sum of the first 12 terms of the arithmetic series.
-5 + 0 + 5 +10 + ...
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Question 142143: Find the sum of the first 12 terms of the arithmetic series.
-5 + 0 + 5 +10 + ...
Answer by nabla(475) (Show Source): You can put this solution on YOUR website!
The sum of the first n terms of an arithmetic progression is .
n=12 <--- # of terms
a=-5 <--starting term
r=5 <--- common difference between terms
s=
=
We can check by iterating every term:
-5+0+5+10+15+20+25+30+35+40+45+50=270.
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