In the diagram of ∆def, the altitude from right angle dfe has been drawn to de. if dg = 4 and ge = 8, then which of the following is the length of fg?

1)4√2
2)3√10
3)12
4)6

Yvaries inversely as x. y =12 when x=5. find y when x=4

Michael gose to a theme park and rides two different roller coasters that both begin on a raised platform his height while on the first roller coaster measured in feet from the platform height can be modeled by the following graph where t is the number of seconds since the ride began

Me get the answer and explain to me the steps to solve it would be greatly appreciated : )