Which of the following represents a coefficient from the expression given?

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

Empty box + box + empty box fill in the box is equal to 30 how

In the diagram below? p is circumscribed about quadrilateral abcd. what is the value of x