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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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GOB Chemistry

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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Microbiology

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Cell Biology

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Analytical Chemistry

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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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Algebra & Trigonometry

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Principles of Accounting

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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In this course you will learn what blockchain and cryptocurrency are, how they work, and how these technologies are being applied. The course explains what smart contracts are and how they work, the rise of new funding mechanisms.

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A gas is compressed and the work done on the gas is -5000 J as illustrated in the diagram below. What is the pressure pa of the gas?

A gas is compressed and the work done on the gas is -5000 J as illustrated in the diagram below. What is the pressure p_a of the gas?