Answer:
On this number line:
A is at -6, B is at -2, C is at 0, and D is at 4.
AB = |-2 - (-6)| = |-2 + 6| = |4| = 4
AC = |0 - (-6)| = |0 + 6| = |6| = 6
AD = |4 - (-6)| = |4 + 6| = |10| = 10
BC = |0 - (-2)| = |0 + 2| = |2| = 2
BD = |4 - (-2)| = |4 + 2| = |6| = 6