Mathematics, 08.01.2020 06:31 stephb1369
The third term of an arithmetic sequence is equal to 9 and the sum of the first 8 term is 42. find the first term and the common difference
Answers: 3
----> equation A![S=\frac{n}{2} [2a_1+(n-1)d]](/tpl/images/0446/7049/d6740.png)
![42=\frac{8}{2} [2a_1+(8-1)d]](/tpl/images/0446/7049/1fe1d.png)
![42=4[2a_1+7d]](/tpl/images/0446/7049/950d0.png)
----> equation B
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The third term of an arithmetic sequence is equal to 9 and the sum of the first 8 term is 42. find t...
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