Helppppp with alll the problems asap!! Show your work
17) [tex]x+2x+1+3x=\boxed{6x+1}[/tex]
18) [tex]17-a+5a-1+4ab=\boxed{4ab+4a+16}[/tex]
19) [tex]2(3y-5+y+2)=\boxed{8y-6}[/tex]
20) [tex]k^2 +k+k^2 -9k+23+k^2 +k+2k^2 -17=\boxed{5k^2 -7k+6}[/tex]