1 Answer

Guapolo · Answer 1 · 2021-06-22T09:10:01+0000

Answer:

$\boxed{\sf -2n+20}$

Explanation:

Let’s find the common difference.

The common difference can be found by subtracting a term in the sequence with the previous term.

$\sf d=16-18\\d=-2$

Apply formula for the
$\sf n^(th)$ term of an arithmetic sequence.

$\sf a_n=a_1+dn-d$

$\sf a_1$ is the first term of the sequence.

$\sf d$ is the common difference.

$\sf a_n=18+-2n-(-2)$

$\sf a_n=18+-2n+2$

$\sf a_n=-2n+20$

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