Verified Answer :

Benjamin16

\(\begin{cases} 4+13 \ \textgreater \ n \\ 4+n \ \textgreater \ 13 \\ 13+n \ \textgreater \ 4 \end{cases} \\ \\ \begin{cases}17 \ \textgreater \ n \\ n \ \textgreater \ 9 \\ n \ \textgreater \ -9 \end{cases} \\ \\ n\in (9,17)\)

kingdom80

Answer:

it is 9 < n < 17 that's the answer

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