Simplify each expression. Answers should contain only positive exponents.
(-5n)(-n^{4})
(6cd^{3})(2c^{4}d)
\frac{-30x^{3}}{5x^{5}}
(-x^{9}y^{2})(10y^{5})(3x^{-3}y^{-8})
4cd^{7}(3c^{4}d^{-3})
(\frac{8a^{4}t}{25at^{7}})^{-2}
\frac{-2x^{-5}}{-6x^{-2}}
\frac{18x^{-5}}{-3x^{-3}}
(xy)^{-3}(-x^{7}y^{2})(30x^{2})
5n^{3}\cdot n^{2}
(\frac{4a^{3}t^{2}}{9at^{6}})^{-3}
\frac{4x^{-1}}{12x^{2}}
