I saw an app a couple years ago that was an interactive equation editor/solver. You could type in an equation, move stuff around, etc, and it would solve for variables you may have in the equation.

Excel can solve equations through several of its mathematical functions, but the single Excel tool that works on the largest variety of equations is the program's Solver Add-in. This tool reads an ...

Grade school math students are likely familiar with teachers admonishing them not to just guess the answer to a problem. But a new proof establishes that, in fact, the right kind of guessing is ...