Question

Solve the compound inequality 9 + 3n >= 6 or 5n < 25.

Answer 1

$9+3n \geq 6 \ \lor \ 5n\ \textless \ 25 \\ 3n \geq 6-9 \ \lor \ n \ \textless \ \frac{25}{5} \\ 3n \geq -3 \ \lor \ n \ \textless \ 5 \\ n \geq \frac{-3}{3} \\ n \geq -1 \\ \\ \boxed{n \geq -1 \hbox{ or } n\ \textless \ 5} \\ \\ \hbox{answer C}$