They observe it, run tests on many different things, and do expirments
No if it is squared it is a parabola. To be linear it has to be. A straight line
Answer:
It discusses Pollution levels in the Air
Explanation: Air can be hazardous to those lungs that are weak. They have something called an Air Quality Alert to warn those with weak lungs to take precautions. Hope this helped!
It is defined as well idk you gotta give me options man