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Scientific Calculator with a Graphing Function - This is a scientific calculator capable of showing formula graphs. With a large enough screen to be able to display graphs and equations simultaneously to facilitate calculations and corrections in high detail. Its 7x3.3 size ensures comfortable wearing. Programmable System - has a programmable system for all levels of courses and promotes learning of student concepts rather than button memorization for more efficient learning. 280+ functions including fractions, statistics, complex number calculations, linear regression, standard deviation, permutations, and variable resolution Perfect for advanced and beginner courses including pre-algebra, algebra I, algebra II, geometry, trigonometry, calculus, AP calculus, AP statistics, biology, chemistry, physics, finance, and business. If you can't turn on the calculator, press the reset button on the back. If you still have any other issues, we offer a 365-day limited warranty. Please contact us and we will give you an answer within 24 hours.