For an arithmetic sequence $(a_n)$: $$\begin{gathered}
a _ { 2 } = 2 a _ { 1 } + 1 \\
a _ { 6 } + a _ { 22 } = 34
\end{gathered}$$ equalities are given. Accordingly, what is $a _ { 7 }$? A) $61^3$ B) 7 C) 8 D) 9 E) 10
For an arithmetic sequence $(a_n)$:
$$\begin{gathered}
a _ { 2 } = 2 a _ { 1 } + 1 \\
a _ { 6 } + a _ { 22 } = 34
\end{gathered}$$
equalities are given.
Accordingly, what is $a _ { 7 }$?\\
A) $61^3$\\
B) 7\\
C) 8\\
D) 9\\
E) 10