If $A(6, 5)$ and $B(4, 3)$,then the midpoint of $\overline{AB}$ is..........

$P(3, 2)$ and $Q(7, k)$ are the given points. If $d(P, Q) = 5$,then $k = \dots \dots \dots$

The distance between the points $(6, 8)$ and $(3, 4)$ is .........

If $A(4, 3)$ and $B(8, 9)$,then the midpoint of $\overline{AB}$ is $\ldots \ldots \ldots \ldots .$

If $A (4, 7)$ and $B (7, 3),$ then $AB = .............$

State whether the following statement is true or false. Justify your answer.
The point $A (2,7)$ lies on the perpendicular bisector of the line segment joining the points $P (6,5)$ and $Q (0,-4)$.