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Simplify. $\sqrt{72x^8 y^3}$
 A $$\displaystyle{36x^4\sqrt{ y^3}}$$ B $$\displaystyle{6x^4\sqrt{2y^3}}$$ C $$\displaystyle{9xy^3}$$ D $$\displaystyle{36x^4y\sqrt{y}}$$ E $$\displaystyle{6x^4 y\sqrt{2y}}$$
Simplify. $\sqrt{48 x^9 y^2}$
 A $$\displaystyle{4x^4 y\sqrt{3x}}$$ B $$\displaystyle{24x^3 y}$$ C $$\displaystyle{2x^3 y\sqrt{12}}$$ D $$\displaystyle{4y\sqrt{3x^9}}$$ E $$\displaystyle{4x^3y\sqrt{3}}$$