Limited time offer from Texas Instruments on two popular apps to improve math and science teaching and learning. Regular price is $29.99. On sale now for $4.99. UPDATE: Sale has ended.
TI-Nspire App for iPad
TI-Nspire CAS (Computer Algebra System) for iPad
From the descriptions on the iTunes Store:
comprehensive graphing, data entry and analysis, statistical modeling and calculating functionality
observe how equations change in real time by interacting with shapes and graphs on the screen
graph functions, inequalities, conic sections, scatter plots, statistical plots, 3D graphs and more
Learn more about these apps at the TI website. If you purchase either of these apps using the links below, I will get a small commission on the sale. Thanks for supporting my work.