We cannot connect the 74ls138 straight with a seven segment display; for that we need a 7447(7 segment driver).
There is no specific name.
not what those guys said
With a straight-edge and a compass:Swing arcs from each end of the segment with the compass (without changing the settings)Connect the intersections of these arcs.The resultant is a perpendicular bisector of the segment.
7
13
Take a compass, extend it about 3/4 of the length of the segment. Then from one end of the segment, draw a 180 degree arc. From the other end draw another arc. Connect the points where the arcs intersect. Where the line intersects with the segment is the midpoint of the segment. That is how you bisect a segment to find the midpoint - geometrically.
If you mean that the line segment endpoints are (-4, 0) and (7, 0) then the midpoint is (1.5, 0)
no
A chord.
A line segment would connect two points on a plane.
-4.5
The midpoint of the line segment of (-4, -3) and (7, -5) is at (1.5, -4)