Mathematics, 27.07.2019 23:30 destanybrunson
What is the sum of the first 14 terms of the sequence? -11+ (-18) + (-25) + (-32) +
Answers: 1
, of our sequence. Remember that in an arithmetic sequence 
, so:
![S_{n}= \frac{n}{2} [2a_{1}+(n-1)d]](/tpl/images/0928/9340/cf4a5.png)
is the number of terms we want to add
, 
. So lets replace those values in our formula:![S_{n}= \frac{14}{2} [2(-11)+(14-1)(-7)]](/tpl/images/0928/9340/92f5b.png)
![S_{n}=7[-22+(13)(-7)]](/tpl/images/0928/9340/47701.png)
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What is the sum of the first 14 terms of the sequence? -11+ (-18) + (-25) + (-32) +...
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