Basics of evaluating an expression

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Adding Rational Expressions Example 2

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Vampires and math students want to know: How many red blood cells are in the a human body? We can find the answer using scientific notation. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/exponents-radicals/computing-scientific-notation/e/computing-in-scientific-notation?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra Watch the next lesson: https://www.khanacademy.org/math/pre-algebra/order-of-operations/place_value/v/place-value-1?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra Missed the previous lesson? https://www.khanacademy.org/math/pre-algebra/exponents-radicals/computing-scientific-notation/v/simplifying-a-complicated-expression-into-scientific-notation?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra Pre-Algebra on Khan Academy: No way, this isn’t your run…