Please help me with this please!

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 is the solution to the division problem below x3+x2-11x+4/x+4

Acircle has a radius of 12.6cm what is the exact length of an arc formed by a central angle measuring 120