Check the picture below.
surely you know how much that is.
To rewrite as a function of x (f(x)), write the equation so that y is by itself on one side of the equal sign and an expression involving only x is on the other side.
f (x) = - x^4
The coin should land on heads around 50 times
I would say the amount used would be at least 50 gallons because it makes most sense. Hope I helped :))