It costs $4.50 for 25 fluid ounces of detergent Brand A. It costs $13.50 for 90 fluid ounces of detergent Brand B. What is the difference between the unit rates of the two detergents?

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