If this is the dance position you are describing, then the arm and the leg of the dancer both make "right" angles (90º angles) to the floor.
Answer:

Step-by-step explanation:

I don’t know it’s hard tho
(2.34/ 7.89) times 100 = ˜29.65%
I’m not exactly sure what you mean by “write it in math,” however I can tell you what I think.
4y=x
(It says that x is 4 times the value of y which means that y times 4 is x.)