Consider the following premises. For all x_7, x_7 will read a book or x_7 will listen to a song. For all x_7, if x_7 reads a book, then x_7 is climbing a mountain. There is at least one x_7 for which x_7 is an artist. For all x_7, x_7 will listen to a song if and only if x_7 will climb a mountain. Can we infer the following from them? There is at least one x_7 for which x_7 is an artist and x_7 will climb a mountain.
 From the fact that for all x_7, x_7 will listen to a song if and only if x_7 will climb a mountain we can infer that for all x_7, if x_7 listens to a song, then x_7 is climbing a mountain. From the fact that for all x_7, if x_7 reads a book, then x_7 is climbing a mountain, that for all x_7, if x_7 listens to a song, then x_7 is climbing a mountain, and that for all x_7, x_7 will read a book or x_7 will listen to a song we can infer that for all x_7, x_7 will climb a mountain. Finally, from the fact that there is at least one x_7 for which x_7 is an artist, and that for all x_7, x_7 will climb a mountain we can infer that there is at least one x_7 for which x_7 is an artist and x_7 will climb a mountain. Therefore, the answer is yes.