Figure abcd is plotted on a coordinate plane. the figure transforms to create figure a'b'c'd'. which transformation took place?
a counterclockwise rotation through 90° about the origin
b reflection across the origin
c reflection across the y-axis
d clockwise rotation through 180° about the origin
e reflection across the x-axis

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