Subtract. (-w+0.4)-(-w-0.4)

0.8

Step-by-step explanation:

(-w+0.4)+(w+0.4)

=0.8

1. Distribute the negative
(-w+0.4) - (-w-0.4)
-w+0.4+w+0.4
2. Combine like terms
-w+w+0.4+0.4
=0.8

The answer would be A and C. Because the definition of a vertical angle is when 2 pairs of non-adjacent angles caused by intersecting lines, are congruent. These two angles are not adjacent and both angles are congruent. Since the angles are under that criteria, it is vertical.