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Verified Answer :

The vertices of a rectangle are always: (x₁,y₁),(x₁,y₂),(x₂,y₂) and (x₂,y₁)
we have:
(x₁,y₁)=(3,3) ;   x₁=3; y₁=3
(x₁,y₂)=(3,6);    x₁=3; y₂=6
(x₂,y₂)=(7,6);    x₂=7,  y₂=6

The fourth vertex will be (x₂,y₁)=(7,3)


Answer:the fourth vertex of this rectanble will be:  (7,3)
        
                 B(3,6)                    C(7,6)


                 A(3,3)                    D(7,3)