Vertical angles are the angles that are opposite each other when two lines intersect. Without a specific diagram indicating the positions of angles 2, 5, 6, 7, and 8, I can't definitively say which angle is the vertical angle to ∠7. However, if you have a specific intersection where angle 7 is located, you can identify its vertical angle as the angle that is directly across from it.
If you can provide additional information about the arrangement of the angles, I can help you determine which one is the vertical angle to ∠7.