Calculus

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Find the functions a) f o g, b) g o f, c) f o f, d) g o g, and their domains.

f(x)= square root of x, g(x)= cube root of 1-x

These are my answers, but I am not sure about them and I only figured out one domain... that is the part that really confuses me. Help please!

a) 5th root of 1-x
Domain?

b) The cube root of (1 minus the square root of x)
Domain?

c) Fourth root of x
Domain= [0, infinity]

d) The cube root of (1 minus the cube root of 1 minus x)
Domain?

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