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Lesson 3 Problem-solving Practice Adding Linear Expressions 2. Heather was building a scale model of the Pentagon for her history class. 7" P= (246) 3. A mailing st mailing env a variety of 4 centimete Write and the perime (2x + 3) in a. Write and simplify an expression to represent the perimeter of Heather's scale model. 4. Find the perimete b. Find the perimeter of the model if x = 2:
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