Dry air is moving upward. If the ground temperature is 20⁰ and the temperature at a height of 1km is 10⁰ C, express the temperature T in ⁰C as a function of the height h (in kilometers), assuming that a linear model is appropriate. (b)Draw the graph of the function in part (a). What does the slope represent? (c) What is the temperature at a height of 2km?