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Struggling with evolution, ecosystems, or the human body? Master key biology concepts with clear explanations that make learning easier.

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New to chemistry? Atoms, elements, and reactions are broken down into simple steps to build a strong foundation for success in class and labs.

Introduction to Chemistry

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Macroeconomics

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Nutrition

Learn how medical terms are built and what they mean by breaking them into simple parts. This course helps you understand and use the language of healthcare with confidence.

Medical Terminology

Explore how human societies are organized, how social relationships shape behavior, and how cultural, economic, and political forces influence everyday life.

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Learn the toughest concepts covered in Beginning Algebra with step-by-step video tutorials and practice problems by world-class tutors 

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Beginning & Intermediate Algebra

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Introductory Biology

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Human Biology

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Algebra & Trigonometry

From logic and problem solving to voting systems, personal finance, and statistics, liberal arts math topics are explained step-by-step to build confidence with real-world mathematical thinking and strong preparation for quizzes and exams.

Liberal Arts Math

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Quantitative Reasoning

Learn the type of accounting that focuses on providing financial information to internal stakeholders within an organization

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Learn the guidelines that govern how financial transactions are recorded and reported

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From whole numbers and integers to equations and graphing, develop a strong understanding of foundational math concepts with clear, step-by-step support every step of the way.

Prealgebra

Master the fundamentals of algebra as you solve equations, analyze patterns, and work with mathematical relationships through guided, step-by-step instruction.

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A rechargeable battery is made up of two Au/Au3+ half-cells. The initial concentrations of Au3+ in each half-cell are 1.50 M and 1.25×10–3 M, respectively, and each cell has a volume of 2.50 L. Calculate the time it will take to redissolve 1.25×102 g of gold charging at a current of 11.5 amps?