If u can do this your a real mathematics like OMG

z+x x y

2 4/5 + (3/5 × 1/3) use BODMAS

14/5 + 1/5

15/5

3

Step-by-step explanation:

If you wanna create something with the shape of a rollercoaster you've got to use equations with sinus and cosinus, since their shape varies from K to -K throughout time.

You should use something with this shape:
y = K·sin (x+n)
y = K·cos (x+n)

Sample equations would be:
y = 2·sin (x+1)
y = 5·sin 2x
y = cos (x-3)