The russo-japanese war was a conflict between russia and japan that started in the year 1904. let x represent any year. write an inequality in terms of x and 1904 that is true only for values of x that represent years before the start of the russo-japanese war.

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?