Mathematics, 27.06.2019 14:50 carnations
Ineed with this question someone and explain. find the sum of the first twenty-seven terms of an arithmetic series whose first term is -8 and the sum of the first seven-term is 28.
Answers: 3
![S=\frac{n}{2}[2a1+(n-1)d]](/tpl/images/0023/6863/00d41.png)
![28=\frac{7}{2}[2(-8)+(7-1)d]](/tpl/images/0023/6863/b7fb1.png)
![28=\frac{7}{2}[-16+(6)d]](/tpl/images/0023/6863/9e9ee.png)
![8=[-16+(6)d]](/tpl/images/0023/6863/1f6a9.png)
![S=\frac{27}{2}[2(-8)+(27-1)(4)]](/tpl/images/0023/6863/215f1.png)
![S=\frac{27}{2}[(-16)+(104)]](/tpl/images/0023/6863/8e5e1.png)
![S=\frac{27}{2}88]](/tpl/images/0023/6863/cfbaa.png)
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Ineed with this question someone and explain. find the sum of the first twenty-seven terms of an...
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