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IN GRADE 8, INSTRUCTIONAL TIME SHOULD FOCUS ON THREE CRITICAL AREAS: (1) FORMULATING AND REASONING ABOUT EXPRESSIONS AND EQUATIONS, INCLUDING MODELING AN ASSOCIATION IN BIVARIATE DATA WITH A LINEAR EQUATION, AND SOLVING LINEAR EQUATIONS AND SYSTEMS OF LINEAR EQUATIONS; (2) GRASPING THE CONCEPT OF A FUNCTION AND USING FUNCTIONS TO DESCRIBE QUANTITATIVE RELATIONSHIPS; (3) ANALYZING TWO- AND THREE-DIMENSIONAL SPACE AND FIGURES USING DISTANCE, ANGLE, SIMILARITY, AND CONGRUENCE, AND UNDERSTANDING AND APPLYING THE PYTHAGOREAN THEOREM.
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