IB Smacher Glau Posted May 1, 2012 Report Share Posted May 1, 2012 This Q is For P2 Math Hl .. in the image below the last Q how can we do it using the GDC ?http://img594.imageshack.us/img594/6620/photo2rr.jpg Reply Link to post Share on other sites More sharing options...
dessskris Posted May 1, 2012 Author Report Share Posted May 1, 2012 Just tabulate the data in your calculator. There will be an option for probability stuff. Which TI do you have? Would be best to ask somebody who has the same type of calculator. Reply Link to post Share on other sites More sharing options...
IB Smacher Glau Posted May 1, 2012 Report Share Posted May 1, 2012 Just tabulate the data in your calculator. There will be an option for probability stuff. Which TI do you have? Would be best to ask somebody who has the same type of calculator.Ti-84 ! the problem is that I dont know what values I need to input the upper values or the down values from the table ? Reply Link to post Share on other sites More sharing options...
dessskris Posted May 1, 2012 Author Report Share Posted May 1, 2012 Oh. Mid value. 1 Reply Link to post Share on other sites More sharing options...
IB Smacher Glau Posted May 2, 2012 Report Share Posted May 2, 2012 Any Idea !! this might come 2moroP(BIA)=1/3P(BIA')=3/4P(A)=3/5find P(B') and P(AIB) ?any Ided how to tackle this Q the final answer is P(B')=0.5and P(AIB)=2/5 Reply Link to post Share on other sites More sharing options...
Smile44 Posted May 2, 2012 Report Share Posted May 2, 2012 Any tips for the math SL exam tomorrow? Easy? Hard? Reply Link to post Share on other sites More sharing options...
MariusIBDP Posted May 2, 2012 Report Share Posted May 2, 2012 My question is 5 in the following link: http://failai.in/sho...Exercise_2A.jpg Wait 10 s., push 'Pirmyn' (the green button). Trust me, no virus Have no idea how to do anything in that exercise, except that Period is 2p-240. Reply Link to post Share on other sites More sharing options...
BG1 Posted May 5, 2012 Report Share Posted May 5, 2012 Do I have to wait til July to know what my IA grade was in Math Studies? Reply Link to post Share on other sites More sharing options...
Where Love Died Laughing Posted May 5, 2012 Report Share Posted May 5, 2012 Do I have to wait til July to know what my IA grade was in Math Studies?Yes. As far as I know we get our final point grades on the 6th and a few days later our exact grades for each section (IAs, papers, etc)... Not sure if that's true, but I recall the teacher mentioning that. However, your teacher probably told you what he gave you? This might be moderated, but it's usually about 2 points or so, nothing drastic... Reply Link to post Share on other sites More sharing options...
LikeA'13OSS Posted May 25, 2012 Report Share Posted May 25, 2012 What is the integration of x2/(x2+1) Reply Link to post Share on other sites More sharing options...
The Economist Posted May 25, 2012 Report Share Posted May 25, 2012 What is the integration of x2/(x2+1) 3 Reply Link to post Share on other sites More sharing options...
LikeA'13OSS Posted May 25, 2012 Report Share Posted May 25, 2012 What happened to the x2 in the numerator? where did it go? Reply Link to post Share on other sites More sharing options...
The Economist Posted May 25, 2012 Report Share Posted May 25, 2012 What happened to the x2 in the numerator? where did it go?Don't you see I added +1 and -1? Then split the fraction. One fraction is x^2+1/x^2+1 and the other is -1/x^2+1 1 Reply Link to post Share on other sites More sharing options...
LikeA'13OSS Posted May 25, 2012 Report Share Posted May 25, 2012 ohh yes i got it How would you solve this: FInd the integration of ex/(e2x+9) Reply Link to post Share on other sites More sharing options...
Drake Glau Posted May 25, 2012 Report Share Posted May 25, 2012 (edited) using | for integral sign |(ex)/(e2x+9)dx Let u=ex therefore du=exdx so dx=1/ex Plug stuff in and you get |1/(u2+9) Quickly notice that it's ALMOST arctan and actually is a form of it. You just need to get that 9 out of there somehow. Now it might just be too early for me but I checked my answer with Wolframalpha and got something different but I don't know what they are doing. Factor that nine out of the bottom so you have (1/9)|1/(u/9)2+1 That gives you an answer of (1/9)arctan(u/9) or (1/9)arctan(ex/9) Wolfram alpha got (1/3)arctan(u/3) which didn't seem right, take the derivative and I didn't get the integrant you posted *Derivative of (1/3)arctan(u/3) is 1/(u2/3)+3 isn't it? O.o Yep, too early for me to do calc at the time, refer to post under me... Edited June 4, 2012 by Drake Glau 1 Reply Link to post Share on other sites More sharing options...
CocoPop Posted June 4, 2012 Report Share Posted June 4, 2012 using | for integral sign |(ex)/(e2x+9)dx Let u=ex therefore du=exdx so dx=1/ex Plug stuff in and you get |1/(u2+9) Quickly notice that it's ALMOST arctan and actually is a form of it. You just need to get that 9 out of there somehow. Now it might just be too early for me but I checked my answer with Wolframalpha and got something different but I don't know what they are doing. Factor that nine out of the bottom so you have (1/9)|1/(u/9)2+1 That gives you an answer of (1/9)arctan(u/9) or (1/9)arctan(ex/9) Wolfram alpha got (1/3)arctan(u/3) which didn't seem right, take the derivative and I didn't get the integrant you posted *Derivative of (1/3)arctan(u/3) is 1/(u2/3)+3 isn't it? O.o You're close, but if you differentiate (1/3)arctan(u/3) you get (1/3) * 1/((u/3)^2 + 1) * (1/3) = 1/(u^2 + 9) - use the chain rule. If you'd like to know where arctan comes from in the integration, you need to substitute u/3 = tan(theta). Can't be bothered to write it out in text, so I've done it on Word and screenshotted: 3 Reply Link to post Share on other sites More sharing options...
mayank06090 Posted July 13, 2012 Report Share Posted July 13, 2012 (edited) EDITGot the answer Edited July 28, 2012 by mayank06090 Reply Link to post Share on other sites More sharing options...
MariusIBDP Posted August 7, 2012 Report Share Posted August 7, 2012 How to find a domain and/or range of a reciprocal (or any other) function using only a calculator? My calc. is TI-84+ SE. Reply Link to post Share on other sites More sharing options...
eelnedross Posted August 8, 2012 Report Share Posted August 8, 2012 Need help with this: The cost C of ordering and storing x unites of a product is C(x) = x + (10000/x). A delivery truck can deliver at most 200 units per order. Find the order size that will minimize the cost.Thank you! I think you have to use the first and the second derivative.... Reply Link to post Share on other sites More sharing options...
Peanut Butter Jelly Posted August 8, 2012 Report Share Posted August 8, 2012 ^I'm not sure if this is right since I havent done math in a long time.C'(x) = 1 - (10000/x2)(Note 1/x = x-1)We wish to minimize the cost, so set C'(x) = 00 = 1 - (10000/x2)x=100 Reply Link to post Share on other sites More sharing options...
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