Answer:
C. 28
Explanation:
Because the two lines are parallel, according to the law of co-interior angles, they will add together to 180 degrees. (Because if you slide the 4x angle down past line g, they lie on the same line on either side of g).
Therefore we can write an equation to solve for x:
4x+(2x+12) = 180
Take out of brackets:
4x+2x+12 = 180
Combine terms and move 12 to other side:
6x + 12 - 12 = 180-12
6x = 168
Divide both sides by 6:
6x/6 = 168/6
x=28
Hope this helped!