Answer:
{r,z}
Explanation:
U = {r,s,t,u,v,w,x,y,z}
P = {s,t,u,v,w}
Q = {u,v,x,y}
P' means elements in the universe,U, that are not in P.
P'={r,x,y,z}.
Q' means elements in the universe,U, that are not in Q.
Q'={r,s,t,w,z}.
P' intersect Q' means what elements are in common in both lists.
{r,z}