Answer:
x=30, and angle A equals 132°.
Explanation:
Since the angles are alternate-interior, both angles A and B equal the same amount. To figure out the value of x, you'd need to set up your equation like this:
5x-18°=3x+42°
You would need to solve for x, which should equal to 30.
Once you get your x, you need to plug it in into the equation of angle A, which is 5x-18°:
5(30)-18°
150-18°
Angle A = 132°.