Help me do this assignment. My grade depends on it!! *Cure a high schooler's anxiety*

fphysicsclass

See, my derived equation allows me to neglect time! :D
I found it by myself... so proud.

However, I think I neglected to add 2 m to .4 m because it asks for with respect to the floor. Look:

8. A marble rolls down a ramp that sits on table. The marble leaves the base of the ramp with a horizontal velocity. The base of the ramp is 2 meters above the floor. The marble strikes the floor at a distance of 1.8 meters from where it left the ramp. Give the height of the ramp with respect to the floor.
Choose one answer.
2.4 m
0.4 m
4.4 m
1.4 m
2.2 m

Pengwuino

Yup, so remember they want the height from the floor so the answer should be 2.4m