Please help answer this

Why did david smith burnish the surface of his work cubi xix?

Ar 5)when providing general information about an artwork, how is the title indicated? a)"title of artwork" b)title of artwork c)title of artwork d)title of artwork 6)select the term that refers to what the artwork is made of. a)iconography b)medium c)form d)context

1× 10×10×10+2×30×30=[tex]1 \times 10(4) + 2 \times 10(3) = \\ [/tex]