Quadratic equation solver
·It will give you the exact answer (as square root) and an approximation
·It supports imaginary numbers
·It has a random option so you can practice doing it by hand
Pythagorean Theorem
·It will give you the exact answer (as square root) and an approximation
·It has a random option so you can practice doing it by hand
Two variables system of equations
·It will give you the exact answer (as fraction) and an approximation
·It has a random option so you can practice doing it by hand
Three variables system of equations
·It will give you the exact answer (as fraction) and an approximation
·It has a random option so you can practice doing it by hand
N variables system of equations
·You can choose between one and seven variables
·It has a random option so you can practice doing it by hand
·It uses the Cramer's Rule and Laplace Expansion Theorem (yeah I know it can be improved)
Matrix
·It calculates the determinant
·You can get the inverse matrix
·You can choose the degree of the square matrix between 2 and 7
·It has a random option so you can practice doing it by hand
·It uses Laplace Expansion Theorem
Mental Calculation
·You can choose the limit between 5 and 200 and the operations (addition subtraction multiplication and/or division)
·You can choose the time limit between 10 second and 3 minutes
·You have one minute to answer the questions the next one will appear automatically if you answered correctly

Suggestions
If you have any suggestions please let me know. If you want to translate this app just contact me my email is [email protected]