So I did a problem like this last week that I got right, but I'm not understanding exactly what to plug into the equation. Is this like linear regression? If so, I would set the equation equal to 2.000001 correct? This exceeds the 2 mil mark, but the answer is the same as what the professor solved. For my answer I say it's between 2013-14, but that gives the same value for x once it's rounded that was previously solved.