Answer
(a) $\frac{1}{4y^{2}}$
(b) $\frac{1}{u^{4/3}v^{2}}$
Work Step by Step
(a) $(8y^{3})^{-2/3}=8^{-2/3}y^{3*-2/3}=\frac{1}{4y^{2}}$
(b) $(u^{4}v^{6})^{-1/3}=u^{4*-1/3}v^{6*-1/3}=\frac{1}{u^{4/3}v^{2}}$
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