As dry air moves upward, it expands. In so doing, it cools at a rate of about 1°C for every 100 m rise, up to about 12 km.

If the ground temperature is 18°C, write a formula for the temperature at height x km. T(x) =

What range of temperature will a plane be exposed to if it takes off and reaches a maximum height of 6 km?

Write answer in interval notation. The range is