Consider the following premises. For all x, x is a sailor or x will play tennis. If Jessica plays tennis, then Richard is taking a plane. If Jessica were a sailor, then Richard is taking a plane. Can we infer the following from them? If we can, name the inference rule being used: Richard is taking a plane.
 From the fact that for all x, x is a sailor or x will play tennis we can infer that Jessica is a sailor or Jessica is playing tennis via universal instantiation. Finally, from the fact that if Jessica were a sailor, then Richard is taking a plane, that if Jessica plays tennis, then Richard is taking a plane, and that Jessica is a sailor or Jessica is playing tennis we can infer that Richard is taking a plane via disjunction elimination. Therefore, the answer is yes.