As dry air moves upward, it expands and cools. If the ground temperature is 20°C and
the temperature at a height of 1 km is 10°C, express the temperature T (in °C) as a function
of the height h (in kilometers), assuming that a linear model is appropriate. Draw the graph of
the function. What does the slope represent? What is the temperature at a height of 2.5 km?