Can someone help me with this math homework 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

Factor the expression using the gcf. the expression 21m−49n factored using the gcf

How to find the exponential function y=ca^x, with points (1,2) and (2,1)