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How dangerous are heat and humidity? A hot day can feel uncomfortable. But if there’s enough humidity in the air, a hot day can be deadly. The head index describes the "feels like" temperature that combines air temperature and humidity.

In this lesson, students use polynomial functions to explore the heat index and discuss the life-and-death consequences that cities around the world will face in the coming years.

- The heat index describes how hot it feels and is a function of temperature and relative humidity.
- In very hot temperatures, an increase in relative humidity raises the heat index more than it would at moderate temps.
- When the heat index reaches high levels, it is dangerous for humans to go outside. Heat indexes are expected to reach dangerous levels in various places over the next century.

- Evaluate and simplify polynomial expressions
- Graph and compare quadratic equations, and interpret those graphs in a real-world context