TI-30 Xa Scientific Calculator by Texas Instruments. $10.00. Performs basic scientific and trigonometric functions. Ideal for general math, pre-algebra, algebra 1 and 2, trigonometry and biology. Features conversions and fraction calculations. Power Source(s): Battery; Display Notation: Numeric; Number of Display Digits: N/A; Display Characters x Display Lines: 10 x 1.. Save 72%!