Do anyone good at probabilty and statistcs? but college level

Line l passes through points (0,4) and (3,6) what is the slope of a line that is parallel to line l -2/3 -3/2 2/3 3/2

The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)