The EL-W516TB-SL model is perfect for students studying general math and science pre-algebra algebra geometry trigonometry statistics biology and chemistry. This calculator performs 640 advanced scientific math and statistics functions. The EL-W516TB-SL utilizes a 4-line display featuring an exponent symbol. WriteView display allows users to view their input and results as they would appear in a textbook. The home key allows users to start fresh from any screen. This calculator has eight temporary memories three definable memories one independent memory and one last answer memory. This calculator also allows equation editing & playback 1 & 2 variable statistics normal stat and drill modes seven regression types and N-BASE calculations: HEX BIN DEC OCT PEN. Other functions include: logarithms reciprocals powers roots factorials trigs and hyperbolic trigs. Includes a protective hard case and operates on twin-power (solar with battery backup).