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# von luger

Votes on activity by von luger
• Hi Christine, If you mean to ask what the difference is between the two courses, then the normal Biology course is a lot more thorough and extensive, while the High School Biology course is more se...

• Hi Dekin, I found a content page for special relativity (https://www.khanacademy.org/science/physics/special-relativity), but not general relativity, as you wanted. Unfortunately, I don't think we ...

• I've noticed that Khan Academy's Electrical Engineering section is a bit underdeveloped, and your request is completely understandable. I've escalated your concern about the limited content to high...

• To my knowledge, teachers can only assign mastery goals for the whole course, not for units. However, your idea seems quite helpful; I'll escalate it further so it can be made a future possibility....

• Here's the solution: 7cos(9x) -1 = 1 cos(9x) = 2/7           like you said 9/x = cos^-1(2/7) 9/x = 73.40 x = 9/73.40 x = 0.1226 I used cos^-1 to solve the problem, which you should be able to find ...

• These videos worked for me, since I don't think that KA has proofs for more advanced trig derivatives like those. Feel free to check these out, and let me know if they help. If not, I can try to fi...

• Here's how I would solve this question; that might clear up some confusion.  12x - 39 < 9 12x < 48 x < 4 and  -4x + 3 < -6 -4x < -9 x > (9/4) So, 9/4 < x < 4 If you need any clarification in terms ...

• The AP Chemistry course on KA can be used to prepare for the AP Chemistry Exam, which is administered by the College Board and is used to gain university credits in many countries, but is most comm...

• Hi Bonnie,  Here's the structure of 1,3-difluorocyclopentane, with one of its chiral carbons notes as the black C. When looking at whether an atom has the four different groups that make it chiral,...

• Firstly, it's wrong to use the excess reagent because how much of it will actually be used in the reaction is completely unknown. Using the limiting reagent is necessary, because that is the one th...

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