Consider the following premises. If it snows, then it is overcast. It is late or it is snowing. For all x_9, x_9 is a politician. If it is late, then it is overcast. Can we infer the following from them? If we can, name the inference rule being used: It is overcast and William is a politician.
 From the fact that if it is late, then it is overcast, that if it snows, then it is overcast, and that it is late or it is snowing we can infer that it is overcast via disjunction elimination. From the fact that for all x_9, x_9 is a politician we can infer that William is a politician via universal instantiation. Finally, from the fact that it is overcast, and that William is a politician we can infer that it is overcast and William is a politician via conjunction. Therefore, the answer is yes.