I'm having a bit of trouble with this question- will give brainliest if correct

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

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?