An object falls from a height of 400 feet. its height, h, in feet is given by the equation h=-16t^2+400 , where t is the time in seconds the object has fallen. how many seconds will it take for the object to reach the ground?

a.
1/5
b.
5
c.
20
d.
25

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

Use δjkl and δmpn to determine whether don's claim is true or false. which of the following should don use to prove the triangles are similar? sss sas aas aa

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