Does (8, -2) have no solution or infinite solutions?

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

When y’all answer can y’all explain too !

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).