The app is based on a mathematics editor (instead of the usual text editor), which is why you can write any kind of numeric expression similar to how you would write it out by hand. Additionally, it allows you to have several documents open at the same time, allowing you to work simultaneously on all of them.
What is very interesting is the ability to plot complicated graphs in two and three dimensions. While the process isn't very simple, you will have a tutorial available so you can learn how to do in a relatively short amount of time.
Math Mechanixs is an excellent option for beginners in mathematics who will find complete support with each of its multiple features.