Find the area bounded by the curves x = y2 - 4y and x = 2y - y2. your work must include an integral in one variable.

The curves x = y^2 - 4y and x = 2y - y^2 are two parabolas with vertices (-4,2) and (1,1), respectively.

The solutions (0,0) and (-3,3) of system give the common points of these parabolas.
The area is calculated in the image.

These are the multiples of 15 but what you are probably asking or what are the factors of 15