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In the fall of 2024, Citizen Math released updated versions of every lesson in our library, plus a few new ones! We know you may have already prepped an earlier version or planned a repeat of last year, so we're continuing to make these earlier versions available through Thursday December 5, 2024.

You can find the new lessons through the regular search, and we hope you love them as much as we do. You can read more about these updates in Our Community.

How should Arlington National Cemetery plan for its future? Established in 1864, Arlington National Cemetery is the final resting place for thousands of American soldiers. Unfortunately, the Cemetery is running out of room, and there’s no simple solution for what it should do.

In this lesson, students write and solve linear equations to estimate when Arlington National Cemetery will reach capacity, evaluate various proposals to prolong its lifespan, and debate the best way for Arlington to honor soldiers and their families.

- Arlington National Cemetery is an important and historic burial ground for members of the U.S. Military.
- In 2020, the cemetery was expected to run out of space within 20-30 years. In order to extend the cemetery’s ability to accept new burials, the U.S. government considered various proposals to expand the size of the cemetery and/or limit who could be buried there.

- Interpret linear and non-linear graphs
- Create tables, equations, and graphs to model linear relationships in the real-world
- Solve systems of linear equations and interpret the meaning of the intersection in a real-world context