Answer:
x=56
Step-by-step explanation:
There are 3 angles in the triangle
x, 60 and the unknown angle we will call y
y and 2x+4 make a straight line, so that adds to 180
y + 2x+4 = 180
Solve for y
y = 180 - (2x+4)
y = 180 -2x-4
y = 176 -2x
The three angles in a triangle add to 180
x + 60 + y = 180
Substitute in for y
x + 60 + 176 -2x = 180
Combine like terms
-x +236 = 180
Subtract 236 from each side
-x+236-236 = 180-236
-x = -56
Multiply by -1
x = 56
