Consider the following premises. exists x_2: Q_2(x_2) -> T_4(x_2). forall x_2: T_4(x_2) -> Q_2(x_2). Can we infer exists x_2: Q_2(x_2) -> T_4(x_2) from them? If possible, name the inference rules being used at each step.
That is one of the premises. Therefore, the answer is yes.