Find the value of a, if the distance between the points A (-3, -14) and B (a, -5) is 9 units.

Find the distance between the following pair of points :

(0, 0), (36, 15)

Find the distance between the following pair of points :

(a, b), (-a, -b)

A is a point on y-axis whose ordinate is 4 and B is a point on x-axis whose abscissa is -3. Find the length of the line segment AB.