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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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Organic Chemistry

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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.

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From probability to hypothesis testing, statistics concepts are explained step-by-step to build problem-solving skills and exam readiness.

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Statistics for Business

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Macroeconomics

Learn topics such as nutrition, physical activity, mental health, stress management and healthy lifestyle choices.

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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.

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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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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.

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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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What is the pH and [H+] of a 0.24 M H3A (Ka1 = 6.3x10-3, Ka2 = 5.9x10-8, Ka3 = 2.2x10-12) polyprotic acid solution?

What is the pH and [H⁺] of a 0.24 M H₃A (K_a1 = 6.3x10^-3, K_a2 = 5.9x10^-8, K_a3 = 2.2x10^-12) polyprotic acid solution?