Respuesta :

Angle CBA and CBE create a straight angle so they add up to 180.

CBA + CBE = 180
155 + CBE = 180
CBE = 25

Hope this helps :)
The angles ∠ABC and ∠CBE together should equal 180º. 
∠ABC is 155º. 
180 - 155 = 25 
So, ∠CBE = 25º. 
Hope this helps!