Help me plz :)) tyy if you do

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

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?