The TI-30X IIS scientific calculator performs practical and advanced mathematical functions, which is ideal for high school and college-level coursework. This Texas Instruments TI-30X IIS comes with a case, so it's easy to place in your bag or backpack. 2-line display helps you view data easily. 300 functions include general and trigonometric math and science functions, fractions, combinations and permutations, statistics and 5-variable memories. 1- and 2-variable statistics include results for linear regressions and trend line analysis. Slide case can be taken off or placed on quickly. Requires a CR-2025 lithium battery (included). Backed by the manufacturer's 1-year limited .