the square below represents one whole express the shaded area as a fraction a decimal and a percent of the whole. PLS HELP ASAP

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

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

Answer for 10 points show work you guys in advanced < 3