$0$ It is a scalar.
Work Step by Step
$(u+v)⋅0=[⟨3,3⟩+⟨-4,2⟩]⋅⟨0,0⟩=⟨3-4,3+2⟩⋅⟨0,0⟩=⟨-1,5⟩⋅⟨0,0⟩=-1(0)+5(0)=0$ This is a scalar as it only has a magnitude.
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