You can see your questions by clicking on "Profile" on the lower left side of your home page. Then, click on "View All" next to your discussion section.   A brief overview of your questions, comm...

1. Közösség
2. General Khan Academy Questions
3. I cant find the question I asked

You got the general formula right, but you got confused on step 1 or 2. Slope is definitely delta y/delta x, but, to make it easier, it is also y₂ - y₁/x₂ - x₁ You can plug in the coordinate values...

1. Közösség
2. Study Group
3. Slope calculation

Companies use Red, Green (not really), and White hat hackers to prevent cyber attacks and can actually get into contact with the bad hackers.

1. Közösség
2. Content Requests and Feedback
3. Can you add a course on hacking?

It's right under the "Community" label. You can click "all news"

1. Közösség
2. General Khan Academy Questions
3. "Retired" Speed badges?

Hey! No problem. New badges and competitions are announced here on KA's Zendesk.

1. Közösség
2. General Khan Academy Questions
3. "Retired" Speed badges?

Hi Richard, You are correct that the Sub-Light Speed and 299, 792, 458 Meters per Second were recently retired. I don't know if they will be returned though.   

1. Közösség
2. General Khan Academy Questions
3. "Retired" Speed badges?

Artemis and Atlas are currently deemed "impossible" to attain due to the fact (which I can neither confirm nor deny) that there are less skills on KA than the required.   EDIT:  According to the KA...

1. Közösség
2. General Khan Academy Questions
3. How do I get the "Is Sal" Black hole Badge

It could be that they're using their parent's or an older person's account.

1. Közösség
2. General Khan Academy Questions
3. Reporting child accounts

That's up to your jurisdiction.

1. Közösség
2. General Khan Academy Questions
3. Reporting child accounts

The "Is Sal" badge is also retired now

1. Közösség
2. General Khan Academy Questions
3. How do I get the "Is Sal" Black hole Badge