Us Use cubic regression to find a function
that fits the following points.
(-3, -28) (0, -4) (4, 168) (-5, -174)

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?