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Illustrative Math: Grade 6, Unit 6, Lessons 16 & 17: Two Related Quantities, Part 1 and Part 2
Illustrative Math: Grade 7, Unit 6, Lesson 11: Using Equations to Solve Problems
Illustrative Math: Grade 8, Unit 7, Lesson 3: Powers of Powers of Ten
Illustrative Math: Algebra 1, Unit 7, Lesson 8: Solving Quadratic Expressions in Factored Form (Part 3)
National Parks: America's Best Idea: The Last Refuge (1890-1915)