For the first one, dab is 50 degrees and ac bisects it so angle a is 25 degrees. Then do 180-90-25 which is 65. 65 degrees is acb. Now look at the 180 degree line and subtract 180-65 which is 115. So measure BCE is 115 degrees.
For the second one, try it yourself. Just try to find all angles until you get the one you’re looking for
