Answer:
21°
Step-by-step explanation:
You've given two angles, and that BC and DE are parallel.
We know that ∠CAB, ∠BAD, and ∠DAF have to equal 180° because they're supplementary.
We also know that ∠BAD must equal 54° since ∠CBA and ∠BAD are alternate interior angles. (because BC and De are parallel.)
So we use the fact that ∠CAB(105), ∠BAD(54), and ∠DAF(or ∠x) =180
105°+54°+∠x=180
∠x= 21°
Hope that helps!
