Answer
$\displaystyle\sum_{i=1}^{7}[6+(i-1)(-4)]$
Work Step by Step
Using the summation symbol, the expression $
6+2+(-2)+(-6)+(-10)+(-14)+(-18)
$ can be written as
\begin{array}{l}
\displaystyle\sum_{i=1}^{7}[6+(i-1)(-4)]
\end{array}
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