Jump to content

Ducky Havok

Senior Members
  • Posts

    141
  • Joined

  • Last visited

Everything posted by Ducky Havok

  1. it would be 3^24... instead of just thinking of 4! as just 4*3*2*1, think of it as (4*3*2*1)
  2. On the absolute power thing, just make the number positive and raise it to that power. Like your question, abs[3]^3 is the same as 3^3, which is 27. If it was abs[-3]^3 then you would make it positive and have 3^3 again.
  3. It's right. The derivative of what you typed is [math]2xsin(x)+x^2cos(x)+2cos(x)-2xsin(x)-2cos(x)[/math] Then everything but [math]x^{2}cos(x)[/math] cancles out.
  4. I've always heard r referred to as the radius, not the vertex. Are they the same thing essentially?
  5. On the downside to all who couldn't get this puzzle, I remember doing this back in elementry school. I couldn't get it then, but a lot of other people did. Maybe now that we're all so much smarter we think to much into it.
  6. Okay, there aren't many steps to show for this one. You just have to realize that the derivative of Sec(x) is Sec(x)Tan(x), so your answer is just Sec(x)+C
  7. I don't think so because that adds a division sign... whereas there is no sign need to raise something to a power
  8. I didn't really have much trouble and I didn't squint my eyes. I've seen this a couple times before though, it got me the first time.
  9. I love penguins this much http://www.ebaumsworld.com/penguinswing.html
  10. I thought every AP Calc test had to be taken today so nobody could give out questions illegally (since every test is the same)? And what do you mean what section? If you were referring to my previous post that's for the whole test
  11. For the first one, just foil it out and rewrite [math]cot^{2}(x)[/math] as [math]\frac{cos^{2}(x)}{sin^{2}(x)}[/math]. You get [math]sin^{2}(x)+cos^{2}(x)=1[/math] which is a common identity. For the second, rewrite it as [math]\frac{sin(x)}{cos(x)}+\frac{cos(x)}{sin(x)}[/math]. After you cross multiply and add them together, you get [math]\frac{sin^{2}(x)+cos^{2}(x)}{cos(x)sin(x)}[/math]. The top is equal to 1 (the identity in your first problem), and when you break apart the bottom and rewrite it it is [math]sec(x)csc(x)[/math]
  12. On the scoring guide I have its 0-24 is a 1, 25-39 is a 2, 40-57 is a 3, 58-74 is a 4, and 75-108 is a 5. Each free response is worth 9 points (totaling 54), and for multiple choice you do [number correct - (1/4 * number guessed wrong)]*1.2, meaning there is a max 54 points.
  13. I finished everything with a little time to spare, but I really hate it when as soon as I finish and can't go back I figure something out and realize I did it wrong. I only left one question blank on the whole test
  14. Are you guys taking any other AP tests too? I also have AP Chem, that's not til next Tuesday though
  15. I'm taking it tomorrow too, AB. What year are you ecoli? I'm 11th. I'm a little nervous, but I've done really well on all the practice tests I've taken so far so I should be fine. Good luck to you
  16. (This came right from The Simpsons) What's so funny about the derivative of [math]\frac{r^{3}}{3}[/math]? It's [math]r^{2}dr[/math] or r*dr*r (hardy-har-har) ... lame I know.
  17. Like matt grime said, it depends on the function. You can check a few things though. If you want it to be differentiable at every real x then it has to be continous at every real x. Also, make sure there are no sharp points, like in the absolute value function at 0.
  18. Well if I hadn't read the question so fast I should have realized it wasn't that simple. I did get it after rereading it though
  19. Just a guess.... [hide]Man C, because he saw that men A and B both had on red ones, so he knew his had to be white[/hide]
  20. No, you used the numbers 1 and 2. You have to think single digits
  21. dan, maybe you could use spoilers so others can try without accidently seeing it? Also, want the rest of them up?
  22. 4! means 4 factorial, which is 4 times 3 times 2 times 1.
  23. on numbers 6 and 7 you are only allowed to use one number. Example, five numbers to make 100. 111-11=100. Good job on 2 and 5 dan19 83
  24. Yes you are only allowed to use that one digit, like three 3's to make 729, [math]3^{3+3}=729[/math]
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.