This video uses a real world scenario to demonstrate how to solve inequalities. We will begin to solve the problem of: Do cows pollute?

Originally released by Apperson, 2013. Streaming video file encoded with permission for digital streaming by Infobase on April 30, 2015.

What We Know vs. What We Need to Know (5:39); --How Much Methane Gas is Emitted by Cows in the US? (9:09); -- Are There Other Sources of Methane Gas From Cows? (10:28); -- What Part of Total Methane Gas comes from Cows? (3:30); -- Solving the Big Question (5:55); .