There are also many YouTube videos that can show you how to Find rank of matrix.
This app is the best. Helps with math, lays out the steps beautifully. Has thousands of options to solve one type of questions, the menu is simple, the option to take pictures of your problems is flawless and really time saving, it acts as a refresher by breaking down each step of how to solve various equations.
But there's one thing that should be fixed it has problems with solving word problems if they can solve word problems that will be excellent, the app tells you how to solve the equation and shows you and explains in a simple manner for such a dumb person like me.
The camera was able to read all of my math problems despite the horrible quality on my phone. I have a few hours to complete 19 assignments before the trimester ends and I have already completed 9! Its a little hard to understand at first, but soon it gets easier. The best way to solve problems for math homework or the such, just use the camera for easy and quick problem solving.