Find the area of the figure. Please help on number five!

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

Can someone me with this problem i don't understand i need

Ateacher noticed 5/8 of the students were wearing either blue shorts or white shorts. write two different ways this could be done.