Find the general indefinite integral:

a$.{\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}3\sqrt[4]{x^5}dx$

${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}(u+4)(2u+1)du$

b$.$

${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\sqrt[\phantom{2}]{t}(t^2+3t+2)dx$

d$.$

Please help with all parts