I can’t give you a answer as not enough is provided to but I can show you how
To find the measure of angle BEC, we can use the fact that angles on a straight line add up to 180 degrees.
Given that angle AEB is 30 degrees, and angle AEC is 100 degrees, we can find angle BEC as follows:
Angle BEC = 180 degrees - (angle AEB + angle AEC)
= 180 degrees - (30 degrees + 100 degrees)
= 180 degrees - 130 degrees
= 50 degrees
Therefore, the measure of angle BEC is 50 degrees.
Hope this helps!