How do you source this problem

Y=x-5
4x +y = 20

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g