Consider the following premises. It is raining. If Karen were a nurse, then it is snowing. Karen is a nurse and Robert is excited. Can we infer the following from them? If we can, name the inference rule being used: It is snowing and it is raining.
 From the fact that Karen is a nurse and Robert is excited we can infer that Karen is a nurse via simplification. From the fact that if Karen were a nurse, then it is snowing, and that Karen is a nurse we can infer that it is snowing via modus ponens. Finally, from the fact that it is snowing, and that it is raining we can infer that it is snowing and it is raining via conjunction. Therefore, the answer is yes.