Answer:
x = 30°
Step-by-step explanation:
If line m is parallel to line n (m || n), then we know that the 54° angle and (x+24)° angle are corresponding angles.
If these angles are corresponding, it means that they are equal to one another due to their location being the same on each lines m and n.
If this is true, then so is the following:
54° = x° + 24°
Solve for x:
x° = 54° - 24° = 30°