Safari Live - Day 129 | National Geographic

So in the last couple videos I talked about partial derivatives of multivariable functions, and here I want to talk about second partial derivatives. So, I’m going to write some kind of multivariable function. Let’s say it’s, um, I don’t know, sin of x * …

Hello and welcome back to Khan Academy live SAT. I’m Eric, I’m an SAT tutor and one of the SAT experts here at Khan Academy. Today is our third and final class as a part of this series. We’ve covered SAT Math two weeks ago, last week we covered SAT Readin…

In this video, I want to talk about the system of Jim Crow segregation, which was common in the United States from about 1877 to approximately 1954, although it goes a little bit further than that. Now, you’re probably familiar with some of the aspects of…

The United States is, shockingly, a bunch of states that are united. It was just 13 to start with, but as time marched on, the border marked west, bringing us to today and the 48 contiguous states plus Alaska and Hawaii. They’re usually drawn in these lit…

Hello and welcome to Ed Talks with Khan Academy. I’m Kristin Disarro, the Chief Learning Officer at Khan Academy, and I am excited today to talk to Mike Flanagan, the CEO of the Mastery Transcript Consortium. We’ll find out what that is and what it means …

Hi, this is Kim from Khan Academy. Today we’re learning more about the landmark Supreme Court case Dred Scott versus Sanford, decided in 1857. The ruling in the Dred Scott case inflamed sectional tensions over slavery, which had been growing ever more hea…