A class measured the radius and circumference of various circular objects. The results are plotted on the graph. Why might the measured radii and circumferences not be exactly proportional?

Find the missing dimension! need asap! tiny square is a =3025 in ²

Astudy was interested in determining if eating milk chocolate lowered someone's cholesterol levels.ten people's cholesterol was measured. then, each of these individuals were told to eat 100g of milk chocolate every day and to eat as they normally did. after two weeks, their cholesterol levels were measured again. is there evidence to support that their cholesterol levels went down? how should we write the alternative hypothesis? (mud = the population mean difference= before - after)a. ha: mud = 0b. ha: mud > 0c. ha: mud < 0d. ha: mud does not equal 0

David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?