Final answer:
The length of segment FE is 12 units.
Step-by-step explanation:
The length of segment FE can be found by subtracting the x-coordinates of the endpoints.
Given that the x-coordinate of point F is 4 and the x-coordinate of point E is -8, we can find the length of segment FE as:
Length of FE = |x-coordinate of F - x-coordinate of E| = |4 - (-8)| = 12 units.