Simplify the following monomials pls

Answer:
1.) [tex]a^4b[/tex]
2.) [tex]p^3q^4[/tex]
3.) [tex]2n^4[/tex][tex]2n^4[/tex]
4.) [tex]5xy^2z[/tex]
5.) [tex]2a^3b^5[/tex]
I hope this helps: