Answer is C) x = 50
Step by step
We know the straight angle will equal to 180 degrees.
We know the straight angle includes two angles (76) and (2x + 4)
So our equation is 76 + 2x + 4 = 180
Combine like terms
80 + 2x = 180
Subtract 80 from both sides to isolate variable
80 - 80 + 2x = 180 - 80
Combine like terms
2x = 100
Divide both sides by 2 to solve
2/2 x = 100/2
x = 50