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Nasaralla · Answer 1 · 2023-09-18T21:23:52+0000

Answer:
$\sum^(7)_(n=1) (-2+9n)$

Explanation:

This is an arithmetic series with first term 7 and common difference 9, so the general formula for the nth term of the sequence is
7+9(n-1)=7+9n-9=-2+9n .

The sequence has 7 terms, so the sigma notation is:

$\sum^(7)_(n=1) (-2+9n)$

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