Cartesian Coordinate System app for iPhone and iPad

Learning Cartesian Coordinate System is easy.
Get a nice tutorial right now!
This is a TabBar application with five Views: Info, Demo, Tasks, Pictures, and Results.
Info View will give you some historical information about the development of the Coordinate System.
Demo View will provide an explanation of the Cartesian Coordinate System using a few examples.
Tasks View will randomly generate points on Coordinate Plane. Students should write the abscissa and ordinate of the generated point.
Pictures View will guide the students to draw pictures using points on the coordinate plane.
Results View will show the students progress in the learning Coordinate System.
See screenshots below!