6300/90? PLS help

If x = 12 and y = 3, what is the value of x - y 2? 81 6 3 18

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

Find the unit rate for: 75% high-fiber chimp food to 25% high -protein chimp food.