Answer:
15x^3y+6x^2y^2+9xy^3
here (I need 20 characters in order to send this so don't mind this text)
m=20
Step-by-step explanation:
x = 111
126+158+120+125+121+139 = 789
900-789 = 111
(n-2)*180
5*180 = 900
