Answer
$(\neg r \vee \neg c) \longrightarrow \neg v$
Work Step by Step
Let
$r$ = I am registered
$c$ = I am a citizen
$v$ = I vote
Then
$\neg r$ = I am not registered
$\neg c$ = I am not a citizen
$\sim v$ = I do not vote
Thus,
The given statement is translates to:
$(\neg r \vee \neg c) \longrightarrow \neg v$