I need help on this one too
Will give 100 points!

[tex]\\ \sf\longmapsto 11x+13x+10<150[/tex]
So
[tex]\\ \sf\longmapsto -150<11x+13x+10<150[/tex]
Add them on all sides
[tex]\\ \sf\longmapsto 150<23x+310<450[/tex]
Done