Arock breaks loose from a cliff and plunges towards the ground 400 feet below. the distance 'd' that the rock falls in 't' seconds is given by the equation d=16t^2 (d equals 16 t squared). how long does it take the rock to hit the ground? (show all work)

Ben bowled 124 and 188 in his first two games. what must he bowl in his third game to have an average of at least 160?

8. kelly wants to buy a magazine that is $25. later the magazine was marked up an additional 20%. what is the new price?

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