which expression can be used to determine the reference angle for an angle, x, measuring 150°?\n180° - x\nx…

Explanation:

Step1: Recall reference - angle rules

For an angle (x) in the second - quadrant ((90^{\circ}<x < 180^{\circ})), the reference angle is given by (180^{\circ}-x). Since (x = 150^{\circ}) and (90^{\circ}<150^{\circ}<180^{\circ}), the angle (150^{\circ}) is in the second - quadrant.

Answer:

A. (180^{\circ}-x)