Find the sum of the first eight terms of the sequence described.
(a) Arithmetic with $a_{1}=23$ and $d=-4$.
(b) Geometric with $a_{1}=4$ and $r=3$.

Name: Find the sum of the first eight terms of the sequence described. (a) Arithmetic with $a_{1}=23$ and $d=-4$. (b) Geometric with $a_{1}=4$ and $r=3$.
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The Answer of Find the sum of the first eight terms of the sequence described.
(a) Arithmetic with $a_{1}=23$ and $d=-4$.
(b) Geometric with $a_{1}=4$ and $r=3$.

Find the Sum of the First Eight Terms of the Sequence