Translate the following inference to logic notation: For all x, if x_9 plays squash, then x_9 is poor. For all x, x_9 is poor. For all x, if x_9 were poor, then x_9 is playing squash. Therefore for all x, x_9 will play squash or x_9 will listen to a song.
forall x: P(x) -> Q(x). forall x: Q(x). forall x: Q(x) -> P(x). Therefore forall x: P(x) or R(x).