Answer
$\frac{1}{1000y^{3}}$
Work Step by Step
The given expression is
$=(10y)^{-3}$
Use the definition of negative-exponent.
$=\frac{1}{(10y)^{3}}$
Use the power of a product property.
$=\frac{1}{(10)^{3}y^{3}}$
Simplify.
$=\frac{1}{1000y^{3}}$.
