Respuesta :

The angles are vertical angles therefore they are equal to each other .
Then set up the equation...
x+16 = 4x-5         and solve

x+16 = 4x-5 
-x         -x
16= 3x -5 
+5      +5
21 = 3x 
x= 7

So your answer would be the multiple choice D or x=7