a b and c are points on the circumference of a circle. XY is a tangent to the circle at the point a. angle bay = 72 ame angle ABC = 54. prove that triangle ABC is an isosceles triangle. you must give a reason for any statement that you make or any calculation that you carry out.

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