Cho hình thang vuông ABCD có góc A bằng góc D (=90 độ), đường chéo BD vuông góc với cạnh bên BC và BD=BC a) Tính các góc của hình thang
b) AB=3cm. Tính độ dài các cạnh BC, CD

What expression is equivalent to 1/2(2+3x-6)

The height of a flare fired from the deck of a ship in distress can be modeled by h(t)= -2(8t^2-52t-28), where h is the height of the flare above water and t is the time in seconds. a. find the time it takes the flare to hit the water.

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