What type of problems can be solved by using the greatest common factor?

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?

What is the solution of the equation? 35√(x+2)3+3=27

How do i i solve this equation? -18 = x/3 + 3