Translate the following inference to logic notation: For all x, if z were rich, then z is an electrician. For all x, z is a cashier if and only if z is rich. For all x, if z reads a book, then z is an electrician. For all x, z is a cashier or z will read a book. Therefore for all x, z is an electrician.
forall x: P(x) -> Q(x). forall x: R(x) <-> P(x). forall x: S(x) -> Q(x). forall x: R(x) or S(x). Therefore forall x: Q(x).