SOLUTION: Find the sum of the first 22 terms in the arithmetic series -6 - 12 - 18 - ...
-1,260
-1,518
-1,386
-1,584
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Question 1035874: Find the sum of the first 22 terms in the arithmetic series -6 - 12 - 18 - ...
-1,260
-1,518
-1,386
-1,584
Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website!
Find the sum of the first 22 terms in the arithmetic series -6 - 12 - 18 - ...
-1,260
-1,518
-1,386
-1,584
~~~~~~~~~~~~~~~~~~~~~~~~~
Use the formula for the sum of the first n terms of an arithmetic progression
= =
where is the first term, d is the common difference and n is the number of terms (see the lesson Arithmetic progressions in this site).
In your case = -6, d = -6, n = 22.
Plug in this data in the formula and get
= .
Make calculations.
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