Could someone please explain how to find the composition of a function.

Using this one as an example.

f(x)=x^3 and g(x)=3square root x. find g(f(x))

You are cycling around europe with friends. you book into a hostel and you ask the owner what the ratio of men to women is currently staying there. there are 24 men and 6 women. what is the ratio of men to women in its simplest form?

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.

What is the radical expression that is equivalent to the expression 27 1 over 5?