I need help with 4 questions

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

Adrawer contains 12 identical white socks, 18 identical black socks and 14 identical brown socks. what is the least number of socks you must choose, without looking, to be certain that you have chosen two socks of the same colour?

Describe the domain and range of y=2(3)^x-2+5