Answer:
6
Step-by-step explanation:
Coordinate of point D = -6
Coordinate of point A = 18
The coordinate of the midpoint of DA = the coordinate of the point that is half the distance from D to A.
Distance of DA = |18 -(-6)| = |18 + 6| = 24
Midpoint = ½ the distance of DA = ½*24 = 12
Coordinate of the midpoint of DA = coordinate of D + 12 = -6 + 12 = 6
Or,
Coordinate of A - 12 = 18 - 12 = 6
Therefore, coordinate of the midpoint of DA = 6.
