Question
For each arithmetic sequence described, find $a_{1}$ and $d$ and construct the sequence by stating the general, or $n$ th, term.The 9 th term is -19 and the 21 st term is -55
Step 1
We can use the formula for the nth term of an arithmetic sequence, which is $a_n = a_1 + (n-1)d$, where $a_n$ is the nth term, $a_1$ is the first term, $d$ is the common difference, and $n$ is the term number. Show more…
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