Answer:
X= 55
Step-by-step explanation:
So since this is a polynomial, and it has 4 sides, 2x+15 and its opposite ide must equal 180, but since this isn't given we must add 2x=15 to x
2x+15+x= 180 =>
3x= 165=>
165/3= 55
Plugged in= 2(55)+15+ (55)= 180
