an fm radio station signal travels in a 40-mile radius. an am radio station signal travels in a 4-mile radius. how much more area does the fm station cover than the am station

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

I'm confused on this could anyone me and show me what i need to do to solve it.

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.