Find the value of x in each case. Give reasons to justify your solutions!
B, C ∈ AD

Step-by-step explanation:
DCF is 90°
so to find BCE
BCE+64+90=180
BCE=26°
CBE is (180-3x)
taking triangle BEC
(180-3x)+x+26=180
180-3x+x+26=180
-2x+26=0
-2x=-26
x=13