i need help with these equations

1.Suppose

y = f(x)

is a curve that always lies above the x-axis and never has a horizontal tangent, where f is differentiable everywhere. For what value of y is the rate of change of

y⁴

with respect to x thirty-two times the rate of change of y with respect to x?

2.Find the 80th derivative of

y = cos 3x.

3.If

F(x) = f(xf(xf(x))),

where

f(1) = 2, f(2) = 3, f ‘(1) = 3, f ‘(2) = 4,

and

f ‘(3) = 5,

find

F ‘(1).

F ‘(1) = 1