Answer:
x=58
Step-by-step explanation:
angles in a quadrilateral add up to 360.
1) form an equation
2x+x+50+x+x+20=360
2) collect the like terms
5x+70=360
3) solve the equation
5x=360-70
5x=290
Sum of all angles of quadrilateral is 360
x + 2x + x + 50 + x + 20 = 360
Bring together the like terms
x + 2x + x + x + 50 + 20 = 360
5x + 70 = 360
5x = 360 - 70
5x = 290
x = 290/5
x = 58°
