Question is attached​

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

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

Qrst is a parallelogram. determine the measure of ∠q pls