1) What is the value of the expression

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

Iam at home. /: i am playing video games. translate the following statement into symbolic form.

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?