Consider the following premises. If it rains, then it is snowing. If Jessica sleeps, then it is raining. Sarah is driving a car if and only if it is snowing. Can we infer the following from them? If Jessica sleeps, then Sarah is driving a car.
 From the fact that Sarah is driving a car if and only if it is snowing we can infer that if it snows, then Sarah is driving a car. From the fact that if it rains, then it is snowing, and that if it snows, then Sarah is driving a car we can infer that if it rains, then Sarah is driving a car. Finally, from the fact that if Jessica sleeps, then it is raining, and that if it rains, then Sarah is driving a car we can infer that if Jessica sleeps, then Sarah is driving a car. Therefore, the answer is yes.