Answer: Choice 3
Explanation:
Oof, this is a tough one. But anyways
Angle 19 + Angle 20 = 180
So Angle 20 = 180 - Angle 19
As l and m are parallel, Angle 20 = Angle 6 from the z rule
So Angle 6 = 180 - Angle 19
Substitute the information given at the start into the equation
2x - 4 = 180 - (5x - 8)
180 - 5x + 8 = 2x - 4
7x = 192
x = 27.42
From what we have found earlier, Angle 20 = Angle 6 so
Angle 20 = 2x - 4 = 2 * 27.42 - 4 = 50.85 rounding it to 50.9
So the answer is 50.9 or Choice 3