This video introduces the notion of congruence modulo n with several examples. In addition, congruence modulo n is shown to be an equivalence relation on the set of integers and the equivalence classes are described.

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Learn how to evaluate expressions that have two different variables in them by using a technique called substitution (or “plugging in”). Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-expressions-and-variables/cc-6th-substitution/e/evaluating-expressions-in-two-variables-2?utm_source=YT&utm_medium=Desc&utm_campaign=6thgrade Watch the next lesson: https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-expressions-and-variables/cc-6th-substitution/v/expression-value-change-examples?utm_source=YT&utm_medium=Desc&utm_campaign=6thgrade Missed the previous lesson? https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-expressions-and-variables/cc-6th-substitution/v/evaluating-expressions-in-two-variables?utm_source=YT&utm_medium=Desc&utm_campaign=6thgrade Grade 6th on Khan Academy: By the 6th grade, you’re becoming a sophisticated mathemagician. You’ll…

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Good day students welcome to the accuplacer elementary algebra sample question review to get a copy of this document you can just go to the www.collegeboard.com website they have these questions and a lot of support materials to help you get ready for the test okay lets go ahead and take a look question 1…