Two different age groups were surveyed about the amount of time they spend on social media the results are shown on the two frequency polygons the same time intervals were used for both graphs. how many more 18 year old students and 12-year-old student spend between 25 and 35 minutes on social media?

Which of the following system of equation is not equal to the system of equations is not equal to the system of equations shown below

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 + 4x + 5 = 0

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