Answer:
30 degrees
Step-by-step explanation:
∠BAC= ∠DAE (vert. opp. ∠s)
(x +10)°= (2x -10)°
x +10= 2x -10
Bring constants to 1 side, x terms to the other:
2x -x= 10 +10
x= 20 (simplify)
∠BAC= (x +10)°
∠BAC= (20 +10)° (substitute x=20)
∠BAC= 30°
<bac=30°
<bac=<ead (being vertically oppoaite angles)
(x+10)=(2x-10)
10+10= 2x-x
20°=x
now
<bac=(x+10)°
<bac=(20+10)°
so,<bac=30°
