Answer:
Ok, so x=4 if you set the two equations equal to each other. Therefore, you sub in 4 to one of the equations, (so 5(4)+20 = 40) so since the angles with the two angles are the same, they both have 40 degrees. So 80 degrees in total is known. Since a full circle is 360 degrees, do 360 - 80 = 280. Then do 280/2 = 140. Therefore the top and bottom angles are 140 degrees each, and left and right angles are 40 degrees each
