Question

If angle abf=7b-24 and angle abe = 2b find angle ebf

Answer 1

< ABE is the whole angle=measures 2b. 
< ABF is a portion of <ABE = measure 7b - 24. 

 measure of the whole angle and a part of the angle

Angle EBF = Angle ABE - Angle ABF 
=7b - 24-2b
=6b-24
hope this helps