function of the domain help thanks for all the help its greatly appreciated?

Question

what is the domain of the following functions

g(x) = 1 - 2x^2

s(y) = 3y/ y+5

f(t) = cubed root of t + 4

f(x)= x-4/square root of x

Answer 1

g(x) = 1 - 2x^2 All the reals

s(y) = 3y/ (y+5) All the reals except -5

f(t) = cubed root of t + 4 All the reals

f(x)= x-4/square root of x [x>0]