Answer:
The correct answer is option B. 140
Step-by-step explanation:
From the figure we can see that,
AB ║ CD
<u>To find the value of x</u>
From the figure we can see that,
<CFE = <BEF [Alternate interior angles are equal]
4x + 20 = 5x - 10
5x - 4x = 20 + 10
x = 30
<u>To find the measure of <BEF</u>
m<BEF = 5x - 10
= (5*30) - 10
= 150 - 10
= 140°
Therefore the correct answer is option B. 140
