Find the following definite integrals by using substitution, including changing the limits of integration appropriately.

$3.{\displaystyle \underset{1}{\overset{6}{}}}\sqrt[\phantom{2}]{x3}dx$

$4.{\displaystyle \underset{0}{\overset{2}{}}}\frac{xdx}{(x^{2}1{)}^3}$

$5.{\displaystyle \underset{-2}{\overset{4}{}}}(x^{2}5x{)}^4(6x15)dx$