Terrible app A 6 year old could develop a better app. Nothing works the way it is supposed to and that makes it impossible to learn anything.
Tutor The way the formula is writen makes no sense how u plug it in other than that its good
Perfect! Provides the simple understanding I needed. Great app! Xperia Play
Error upgrading will not refund will not download PLEASE REFUND MY MONEY... THE UPGRADE WILL NOT DL DUE TO ERROR 941.... WILL NOT ALLOW ME TO REFUND TRIED OVER AND OVER.....
Improved instructions and tutoring messages