In the physics textual lesson on displacement, "What is Displacement," just before four example problems, I believe I have found an error. It says, "they accidentally subtract the final position from the initial position rather than the initial position from the final position." I believe this should actually be reversed. I've read it several times and am curious as to if I'm not get something obvious or if it is in fact a mistake. Would love a confermation on this. Thank you so much for all that you guys do! Y'all are amazing!