What are the rational numbers in those

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

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)