SOLUTION: The question asks to find the sum 8+14+20+...+278

Question 1168814: The question asks to find the sum
8+14+20+...+278
Found 2 solutions by Boreal, ikleyn:
Answer by Boreal(15235)   (Show Source): You can put this solution on YOUR website!
some of an arithmetic series
Sn=(n/2)(2a+(n-1)d)
a=8
d=6
the range is 270, so n=46, n-1=45
=23(16+270)
=23(286)=6578
Answer by ikleyn(52788)   (Show Source): You can put this solution on YOUR website!
.

For introductory lessons on arithmetic progressions see
    - Arithmetic progressions
    - The proofs of the formulas for arithmetic progressions
    - Problems on arithmetic progressions
    - Word problems on arithmetic progressions
in this site.

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    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic "Arithmetic progressions".

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Free of charge online textbook in ALGEBRA-II
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