If a car goes around a turn too quickly, it can leave tracks that form an arc of a circle. by finding the radius of the circle, accident investigators can estimate the speed of the car. to find the radius, accident investigators choose points a and b on the tire marks. then, the investigators find the midpoint c of ab. use the diagram to find the radius r of the circle. round your answer to the nearest tenth.

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