Help please any question u can answer is okay :)

Name the most appropriate metric unit for each measurement like a length of an carrot

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?

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)