Question
Find the indicated part of each arithmetic sequence.Find a formula for $a_{n},$ given that $a_{5}=30$ and $a_{10}=-5$
Step 1
We can write these terms in the standard form of an arithmetic sequence, which is $a_{n}=a_{1}+(n-1)d$, where $a_{1}$ is the first term and $d$ is the common difference. So, we have: $a_{5}=a_{1}+4d=30$ ...(1) $a_{10}=a_{1}+9d=-5$ ...(2) Show more…
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