Answer:
x-coordinates of point B = 3
Explanation:
If the extreme ends of a segment are
and
, coordinates of the midpoint of the given segment will be =

Coordinates of the extreme ends of segment AC are A(-2, -3) and C(8, -3).
Since B is a point that bisects the segment AC, coordinates of point B will be,
=

= (3, -3)
Therefore, x-coordinates of the point B will be = 3