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PBS LearningMedia is a dynamic platform offering the best of public media content and produced specifically for PreK-16 teachers. With free access to over 14,000 high-quality resources tied to national standards, teachers can download, save and share exactly what they need for an inspired classroom experience. Sign up is 

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Math Verisioin of Who Wants To Be A Millionaire

Maxima is a system for the manipulation of symbolic and numerical expressions, including differentiation, integration, Taylor series, Laplace transforms, ordinary differential equations, systems of linear equations, polynomials, and sets, lists, vectors, matrices, and tensors. Maxima yields high precision numeric results by using exact fractions, arbitrary precision integers, and variable precision floating point numbers. Maxima can plot functions and data in two and three dimensions.