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Beginning & Intermediate Algebra

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Introductory Biology

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Algebra & Trigonometry

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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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Given the electron configuration 1s2 2s2 2p6 3s2 3p6 4s1, identify the number of valence electrons.

Given the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹, identify the number of valence electrons.