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find the arithmetic sum 76 + 71 + 66 + … + (−104).

0 votes

find the arithmetic sum 76 + 71 + 66 + … + (−104).

asked Jun 11, 2014 in PRECALCULUS by bilqis Pupil

1 Answer

0 votes

The arithmeic sequence

Formula for n th term in arithmeic sequence

Where = Common difference , = first term

In this case

 a  = 76

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Substitute a = 76 , d = -5, image  values in n th term.

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Formula for arthmetic sum image

Where a = First term , l = last term .

Substitute the values of a = -5, l  = -104 and n  = 37.

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Arthmetic sum of is -518.

 

answered Jun 11, 2014 by david Expert

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