Casio fx-991EX

Casio fx-991EX is a scientific calculator made by Casio. It has 552 functions and 12 modes.
Modes.
1: Calculate.
This mode allows you for basic calculations.
2: Complex.
This mode allows you for complex calculations.
3: Base-N.
This mode allows you for calculations in base 2, 8, 10 or 16.
4: Matrix.
This mode allows you for matrices up to 4x4.
5: Vector.
This mode allows you for vector calculations.
6: Statistics.
This mode allows you for statistics.
7: Distribution.
This mode allows you for distribution calculations.
8: Spreadsheet.
This mode allows you for spreadsheets (up to 45 rows, 5 columns).
9: Table.
This mode allows you for listing calculations up to 45 (f(x)) or 30 (f(x) and g(x)) rows.
A: Equation/Func.
This mode allows you for simulatmous equations and polynomials.
B: Inequality.
This mode allows you for inequality polynomials.
C: Ratio.
This mode allows you for rational calculations.