Select all of the words that represent the answer to a quadratic equation (there are 4 answers).
-x intercepts
-y intercepts
-solutions
-intersections
-roots
-zeros

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?