Pls tell me the correct answer and how you got your answer (step by step)

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

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Simplify the expression. -2/5(10+15m-20n)