Question

Find the indicated intersection or union {q, s, u, v, w, x, y, z} ∪ {q, s, y, z}

Answer 1

The union of two sets combines the members of both sets. The elements $q,s,y,z$ already belong to the first set, so the intersection is just

$\{q,s,u,v,w,x,y,z\}$