I have a few more questions that are giving me a hard time...

1

What is the equation of the perpendicular bisector of the line between the points (2,2) an (6,6)?

2

What is the equation of a parabola with vertex (0,0) and focus (0,4)

3

Given that the equation of a circle is $\displaystyle x^2+y^2-10x+4y+13=0$,

find it's center and it's radius.