Find the sum of the first seven terms of the sequence described.
(a) Arithmetic with $a_{1}=11$ and $d=2$.
(b) Geometric with $a_{1}=7$ and $r=-3$.

Name: Find the sum of the first seven terms of the sequence described. (a) Arithmetic with $a_{1}=11$ and $d=2$. (b) Geometric with $a_{1}=7$ and $r=-3$.
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The Answer of Find the sum of the first seven terms of the sequence described.
(a) Arithmetic with $a_{1}=11$ and $d=2$.
(b) Geometric with $a_{1}=7$ and $r=-3$.

Find the Sum of the First Seven Terms of the Sequence