Tell me everything I need to know and please work out the problems

Simplify.7x + 3y - 2 + 6x + 1 + y squared 2 you! ; )

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?

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)