Simplify the expression. 1/x^2+2/y / 5/x-6/y^2 show your work. this is all one fraction the first half of 1/x^2+2/y is the top and 5/x-6/y^2 is the bottom, someone .

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?