Final answer:
Without additional context or a diagram, it is impossible to determine if angle 4 can be 55 degrees with angle 8 being 125 degrees if m and n are not parallel. The relationship between angles depends on their location and the geometric properties involved.
Step-by-step explanation:
If m and n are not parallel, and angle 8 = 125 degrees, can angle 4 = 55 degrees? Without additional context or a diagram, it is impossible to provide a definitive answer to whether angle 4 can be 55 degrees with angle 8 being 125 degrees if lines m and n are not parallel.
Angles within geometrical figures can have various relationships, depending on their position and the properties of the shapes involved. For example, if the angles are interior angles on the same side of a transversal intersecting two non-parallel lines, their sum should be less than 180 degrees.
In such a case, if angle 8 is 125 degrees, angle 4 cannot be 55 degrees, because their sum would be equal to 180 degrees, which corresponds to parallel lines. However, if angles 8 and 4 are in different locations or belong to different intersecting lines, angle 4 could possibly be 55 degrees.
Without more information, we cannot confirm the exact relationship between angle 8 and angle 4. Therefore, the answer to whether angle 4 can be 55 degrees given that angle 8 is 125 degrees is uncertain.