Okapi

1. Hamjamiyat
2. News and Updates from Khan Academy
3. News: Windows KA app to be removed from app store

Why couldn't you just leave the old app in the store? As a Windows Phone user one is used to get an app with less functions than the other platforms so the expectations weren't as high. I just disc...

1. Hamjamiyat
2. Study Group
3. Permutation and Combinations Practice [Arranging the reindeer]

Hello marcelolandaverde, In 2) all the counted combinations are with Glopin and Lancer together. Your explanation is the approach to determine a probability by calculating its counter-probability. ...

1. Hamjamiyat
2. News and Updates from Khan Academy
3. Update: NEW Support Center Design!

Well, I think it would look quite beautiful if it was displayed correctly. But unfortunately half of this post is covered by the menu ("Our mission is to provide..."), the title of this post is mes...

1. Hamjamiyat
2. Study Group
3. Probability Question

Hello Tajeshwar Khara, Let me write it down in a more clear way: p (early and football) = 0.1 p (early and not football) = 0,05 p (not early and not football) = 0.65 as you see, there is one possib...

1. Hamjamiyat
2. Study Group
3. Chemistry Ozone

Hello Vashaanth,I hope the picture above helps. As you see ozone is very unstable and constantly oscillating between the two structures shown above. A line at an O represents two dots (imagine the...

1. Hamjamiyat
2. Study Group
3. Calculus

Hi bildnera, I think it depends very much on which function you have. I think it will have an other impact on f(x) = x² than on f(x) = 2x+1/x + 7x, for example. If you are interested in a special t...

1. Hamjamiyat
2. Study Group
3. having a problem in trigonometry

Hi Abdellah Elayou, I see from your question that you already see that it isn't as easy as with sin(x) or cos(x). I think you mean the sign (+ or -) in front of the sin or cos? The minus sign in fr...

1. Hamjamiyat
2. Study Group
3. Statistics: T-Test vs. Z-Test and 1 tailed vs 2 tailed test

Hello Parkerha, we learned only binomial and normal distribution so I am not sure what a t and z test is, but I think you are talking about statistical hypothesis test, right? I think I can only tr...

1. Hamjamiyat
2. Study Group
3. Instantaneous Speed/Velocity

Hello Natalia C,   The instantaneous speed (the same applies to velocity) is like the average speed, but just for one instant of time. If you want to know the average speed (is it called so in Engl...

1. Hamjamiyat
2. News and Updates from Khan Academy
3. Update: NEW Support Center Design!

Hello Rufus, Thank you for your answer and that you made a support ticket! I didn't expect such a fast response... should one create every time a support ticket an error occurs?