http://www.newdesignworld.com Liftoff for the latest information at NewDesignWorld.com http://www.newdesignworld.com/detail-graphing_calculator_to_graph_equations-4565.html 2007-05-03 06:20:44 Providing graphing calculators for teachers, students, parents and engineers. They are useful for teaching and studying algebra, calculus, geometry, complex variable function, data visualization, stats, fractal etc.