394174837803 x 441870879=?

Solve 2x+y=3 x+y=5 in substitution method

Joanie watched 1 out of three of a movie in the morning

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?