Answer:
The expression that can be used to determine the reference angle for an angle, x, measuring 150° is A) 180 - X.
The reference angle is the acute angle between the terminal side of an angle and the x-axis in standard position. To find the reference angle for an angle greater than 90 degrees, we subtract the angle from 180 degrees.
In this case, the angle is x = 150 degrees. So, the reference angle would be:
180 - x = 180 - 150 = 30 degrees.
Therefore, the reference angle for an angle measuring 150 degrees is 30 degrees.