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What is the sum of a 17-term arithmetic sequence,the first term is 7 & the last term is -105?

0 votes

1) -833

2) -893

3) -913

4) -943

arithmetic-sequence
sequence-series

asked Feb 28, 2014 in ALGEBRA 2 by johnkelly Apprentice

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1 Answer

0 votes

In arithmetic sequence sum .

Given first term is .

Last term is -------------->( 1 )

Substitute in (1).

Subtract 7 from each side.

Divide each side by 16.

Substitute the values , , and in formula.

Now sum of 17 term arithmetic sequence .

.

The sum of a 17 term arithmetic sequence is .

answered Mar 1, 2014 by dozey Mentor

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