Option D is the correct answer
3x+12+5x+5=25
8x+17=25
8x=8
x=1
Answer x=63
Step-by-step explanation:
Answer:
m∠1=103°
Step-by-step explanation:
see the attached figure to better understand the problem
we know that
An exterior angle of a triangle is equal to the sum of the opposite interior angles
so
In this problem
m∠1=m∠2+m∠3
substitute the given values
m∠1=31°+72°=103°