Consider the following premises. For all x_7, if x_7 were a cashier, then x_7 is not working. For all x_7, x_7 will work. If it is windy, then William is a cashier. Can we infer the following from them? If we can, name the inference rule being used: It is windy.
 From the fact that for all x_7, if x_7 were a cashier, then x_7 is not working, and that for all x_7, x_7 will work we can infer that for all x_7, x_7 is not a cashier via universal modus tollens. From the fact that for all x_7, x_7 is not a cashier we can infer that William is not a cashier via universal instantiation. Finally, from the fact that if it is windy, then William is a cashier, and that William is not a cashier we can infer that it is not windy via modus tollens, which contradicts that It is windy. Therefore, the answer is no.