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2. News and Updates from Khan Academy
3. News: Khan Academy hits 7 million YouTube subscribers!

that's awesome, congratulations!

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2. General Khan Academy Questions
3. Calculus

Hello ammar400.jamb! To complete the entire section of Calculus deals with the average time you have for the course during studying, which is about 3 - 4 weeks to complete - if only you work on it ...

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3. Atomic Mass of different isotopes?

Hello gregorygoulenko! So, according to what I understand, the relative atomic mass of chlorine is 35.5 rather than a whole number; this is because chlorine contains two different isotopes, and chl...

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3. Word problem

Hello Jennifer Svoboda Bangert! That problem could be quite unexplained, but according to what I've worked through, the answer for the *mass of the empty bottle* could be  *mass of the empty bottle...

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2. Feature Requests and General Site Feedback
3. KA Guardian system--improvements

Apologies to say as I have read so far; I was never aware, but I do agree to what the rest of the others said,. And as for the rules quite more as strict; as well as reporting about a user was once...

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3. Simplifying Square Roots

Hello scorpmann44!  I can understand your situation, let me work you through my understanding and steps I have lean't so far,  A square root of a number is one of two equal factors of the number, w...

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3. Math Question

Hello carmen.williams!  Sorry for your problems! but then first of all:  Collinear simply means "Lying on the same line" This are said to bethree or more points if they lie on a single straight lin...

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3. surface area of cylinders

Hi Joe! Well to find the surface area of a cylinder, you have to combine the radius and pi, which is the diameter , as the area of a circle is pi.r^2 : diameter ×radius square, depending the given ...

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3. Classes

Hello Christian!   11th Grade comes with variations of course options, which depends on the individual's choice to partake.  However, the most common courses for an 11th Grade student is English la...

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2. General Khan Academy Questions
3. Difference between Biology Library & High school biology + AP®︎/College Biology

Hello philiplp.school!  Well, it's your choice on whichever biology you'd like to study at University requirement and your level of understanding. In my opinion, it isn't necessary to revise the en...