Translate the following inference to logic notation: For all x, z_4 will play squash or z_4 will not listen to a song. For all x, if z_4 plays squash, then z_4 is listening to a song. Therefore for all x, if z_4 plays squash, then z_4 is listening to a song.
forall x: P(x) or ~Q(x). forall x: P(x) -> Q(x). Therefore forall x: P(x) -> Q(x).