Answer:
x = 11
Step-by-step explanation:
The two angles form a straight line so they add to 180
4x+15 + 11x = 180
Combine like terms
15x+15 = 180
Subtract 15 from each side
15x+15-15 = 180-15
15x = 165
Divide by 15
15x/15 =165/15
