Since the measure of a straight angle is 180º, 180 - 60 is 120, the measure of the angle. Now solve for x. 4x + 20 = 120 Subtract 20 from each side to get 4x = 100. Divide each side by 4 to get x = 25. The answer is the second one. Hope this helps!
These two angles are on a straight line meaning they add up to 180 60 + 4x + 20 = 180 combine like terms 80 + 4x = 180 subtract 80 from both sides 4x = 100 divide both sides by 4 x = 25
now to solve for the angle 4x + 20 4(24) + 20 100 + 20 120 is the angle
