4. The residents of Quietville, a little town 9 km from the San Francisco Airport, insist that any plane flying over their town disturbs them if it is lower than 3 km. Will a plane that took off at a 210 angle disturb them? Why? 5. You are an air pollution inspector, checking that factories in your city have chimneys at least 65 m tall. Standing 50 m from the Ore Smelting Company's chimney, you find the angle from the ground to the chimney top is 510. Can the company use that chimney legally? Explain