Answer:
34
Step-by-step explanation:
Points B,C,D, and E are points on the edge of the circle.
and
are in the same segment.
We have that: 
We want find 
Recall that angles in the same segment are congruent.

So the answer is 34
The percent error is 29%. I posted the equation for percent error on your other question.
A.) y= 5/4x+16
B.) 1.25 hours a day