More than 4,000 years ago, people in ancient Babylonia used math to calculate how much land to use for farming and how much of each crop they harvested. They also used math to calculate how much tax to charge people. Today, we use algebraic tools such as writing and solving equations, systems of equations, inequalities, and systems of inequalities to help us measure and interpret real-world scenarios. What twenty-first century tasks do these tools help us manage?