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what is the sum of the first 29 terms of the arithmetic sequence? -43,-35,-27,-19,...

 Apr 9, 2019
 #1
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The 29th term  is given by :

 

1st term  + common difference * ( 29 - 1)  =

 

-43 + 8*(28)  =    181

 

The sum is given by

 

[ 1st  term + 29th term ]   * number of terms  / 2     =

 

[ -43 + 181 ] * 29  / 2    =

 

[ 138 ] * 29  /  2   =

 

2001  

 

 

cool cool  cool

 Apr 9, 2019

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