Consider the following premises. Jessica is poor if and only if Karen is not a musician. If Karen were a musician, then Karen is not sad. For all x_23, x_23 is sad. Can we infer the following from them? Jessica is poor.
 From the fact that for all x_23, x_23 is sad we can infer that Karen is sad. From the fact that if Karen were a musician, then Karen is not sad, and that Karen is sad we can infer that Karen is not a musician. From the fact that Jessica is poor if and only if Karen is not a musician we can infer that if Karen were not a musician, then Jessica is poor. Finally, from the fact that if Karen were not a musician, then Jessica is poor, and that Karen is not a musician we can infer that Jessica is poor. Therefore, the answer is yes.