Mathematics, 27.06.2019 02:30 limitbreak7897
The first term if an arithmetic sequence is -5 and the tenth term is 13. find the common difference.
Answers: 1
![\bf n^{th}\textit{ term of an arithmetic sequence} \\\\ a_n=a_1+(n-1)d\qquad \begin{cases} n=n^{th}\ term\\ a_1=\textit{first term's value}\\ d=\textit{common difference}\\[-0.5em] \hrulefill\\ a_1=-5\\ n=10\\ a_{10}=13 \end{cases} \\\\\\ a_{10}=a_1+(10-1)d\implies 13=-5+(10-1)d \\\\\\ 13=-5+9d\implies 18=9d\implies \cfrac{18}{9}=d\implies 2=d](/tpl/images/0021/7148/5050c.png)
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The first term if an arithmetic sequence is -5 and the tenth term is 13. find the common difference....
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