9514 1404 393
Answer:
A. 9
Step-by-step explanation:
The exterior angle is equal to the sum of the remote interior angles.
10x -19 = (3x +2) +(5x -3)
2x = 18 . . . . . . . . . . . . . . . add 19-8x to both sides, simplfy
x = 9 . . . . . . . . . . . divide by 2
