To draw a line segment with a length of six units and one endpoint located at eight on the number line, we can start at point 8 and move six units to the right.
The line segment would extend from point 8 to point 14 on the number line.
To indicate the midpoint of the line segment, we can find the halfway point between the endpoints. In this case, the midpoint would be at point 11, which is exactly halfway between points 8 and 14.
So, the marked feature would be placed at point 11 to indicate the midpoint of the line segment.