The sequence \( \{x_n\} \) satisfies the relation \[ \begin{array} &x_1 = 5,&x_{n+1} = x_n + 5 &(n = 1, 2, 3, \ldots). \end{array} \] What is the value of \( x_{20}? \)

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The sequence \( \{x_n\} \) satisfies the relation
\[ \begin{array} &x_1 = 2, &x_{n+1} = 2 x_n + 1 &(n = 1, 2, 3, \ldots). \end{array} \]
What is the value of \( x_{5}? \)

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The sequence \( \{x_n\} \) satisfies the relation
\[\begin{array} &x_1 = 4, &x_{n+1} = x_n + 3n - 2 &(n = 1, 2, 3, \ldots). \end{array} \]
What is the value of \( x_{12}? \)

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