Given:
The coordinate of point A is -6.
Length of line segmebt AB is 20.
Step-by-step explanation:
The length of line segment AB is 20, which means that point B lies at a distance of 20 units from the point A. So if point B lies 20 units to the left of point A, then coordinate of point B is,

And if point B lies 20 units to the right of point A then coordinate of point B is,

So two possible coordinates of point B are -26 and 14.