Answer:
C) 140
Explanation:
You will need to find angles 1, 2 and 3 to get 4
Angle 3 is on the same line as 6 and supplementary, forming 180.
Therefore, substract angle 6 from 180 to get 3
180 = Angle 6 + Angle 3
180 - 120 = Angle 3
60 = Angle 3
Angle 2 is the same concept
180 - 100 = 80
80 = Angle 2
Angle 1
All angles in the triangle are 180, therefore, angle 1 is found using
180 - Angle 2 -Angle 3 = Angle 1
180 - 80 - 60 = Angle 1
40 = Angle 1
And since Angle 1 and 4 are on the same line, supplemantary and forming 180, substract angle 1 from 180 to get angle 4
180 = Angle 1 + Angle 4
180 - 40 = Angle 4
140 = Angle 4