Find the remainder when 2x^3-3x^2+4x+1 is divided by -x-2

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

Ineed someone to me answer my question i have to have this done and knocked out

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?