Find the distance between (-3,-1) and (-2,3)

There is a line with slope 1/a going through the point (a, a²). find the equation of the line perpendicular to this line at this point. (don’t let this problem intimidate you! solve the problem as you would if i’d given you specific values. just use variables instead.)

3. find the radius of circle p.4. find y.

Can someone me with my hwplz(only the circled ones)