It is given in the question that line from negative 10 to 10. point j at negative 8. point k at 4.
We have to find the distance between j and k.
To find the distance between two points, we have to perform subtraction.
So here, to find the distance between j and k, we have to subtract position of point j from position of point k. That is

So the distance between point J and K is 12 units .