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# Algebra foundations

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Origins of algebraAbstract-nessThe beauty of algebraIntro to the coordinate planeWhy all the letters in algebra?

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What is a variable?Why aren't we using the multiplication sign?Evaluating an expression with one variableEvaluating expressions with one variable

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Evaluating expressions with one variableGet 5 of 7 questions to level up!

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Evaluating expressions with two variablesEvaluating expressions with two variablesEvaluating expressions with two variables: fractions & decimalsEvaluating expressions with two variables: fractions & decimals

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Evaluating expressions with multiple variablesGet 3 of 4 questions to level up!

Evaluating expressions with multiple variables: fractions & decimalsGet 3 of 4 questions to level up!

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Intro to combining like termsSimplifying expressionsCombining like terms challenge problemSimplifying expressions with rational numbers

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Combining like terms with negative coefficientsGet 5 of 7 questions to level up!

Combining like terms with negative coefficients & distributionGet 3 of 4 questions to level up!

Combining like terms with rational coefficientsGet 3 of 4 questions to level up!

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Equivalent expressions

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Equivalent expressionsGet 5 of 7 questions to level up!

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Why dividing by zero is undefinedThe problem with dividing zero by zeroUndefined & indeterminate expressions