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3. Missing lesson on floor and roof function

If you are asking about the Computer Programming course, those functions are covered in the Documentation.

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3. Linear Algebra track

If you are not confident in your current skills, I would consider taking Pre-Algebra and Algebra Basics.  If you feel good about your basic skills, I would suggest taking Algebra 1, Algebra 2, Coll...

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3. Mathematics for data and forecasting - course suggestions

You are very welcome!

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3. Calculus C

The College Board, the organization which develops and administers the AP exams, does not offer a "C-only" exam.  Their website doesn't state it outright, but, generally, depending on the college, ...

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2. General Khan Academy Questions
3. How long will it take to complete al courses ranging from algebra 1 to calculus 1?

It is hard to say because not everyone works at the same rate.  The way I see it you want to complete about 5 courses: Algebra 1, Geometry, Algebra 2 (or Integrated Math 1, 2 and 3), Trigonometry, ...

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3. New teacher... where to start??

This resource page may help you: https://support.khanacademy.org/hc/en-us/categories/200175820-For-Teachers

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2. Computing Platform Community Discussions
3. Stuck in Intro to JS

You are so close. Remember that the syntax (or rules) of the line() function is line(x1, y1, x2, y2) In the first for loop, you used lineY to define the y-coordinates of the endpoints of the line...

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3. More Advanced SQL - Karaoke Song Selector

Just clarification for others having issues with the Karaoke Song Selector Challenge: There are three steps in this challenge.  At the end, you should have three SELECT statements. In Step 1, we ar...

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3. Khan Academy's HTML environment is messed up

I am not having any issues with the RGB color picker.  If you are still having a problem, you may want to open a ticket with the Help Center.

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3. How do I solve this equivalent expression?

3^-5 is not equal to 1/3^-5.  Remember that the sign of the exponent changes when you create a fraction. 3^-5 is equal to 1/3^5. Can you get to the next step from there?