Scientific calculator performs more than 169 advanced functions to help students quickly work through their math problems. Direct Algebraic Logic (D.A.L.) display allows your calculations to be displayed as if they're written on paper. Playback functionality makes scientific equations easier for students to edit and run multiple simulations. Extra-large, 11-digit LCD provides a clear view of each digit to help prevent reading errors. Twin-power operation runs on solar energy with a battery backup to provide consistent, reliable performance in any environment. Hard case protects the display and keys for safe storage and transportation. Scientific calculator is perfect for students studying general math, algebra, geometry and trigonometry.