91Jacob Posted May 5, 2010 Report Share Posted May 5, 2010 (edited) Hi, this thread is for everyone who is in the MATHS SL MAY 2010 session.If you remember any answers to Paper 1 of the exam that just passed a while ago please give feedback, or simply ask questions, one of us might remember them. Edited May 6, 2010 by Sandwich You may not discuss Paper 2 or give away information about it, even in a poll, until the time is up. Reply Link to post Share on other sites More sharing options...
alexno Posted May 6, 2010 Report Share Posted May 6, 2010 So what did u guys get for the area of the shaded region in the last question? Where you had to express it in terms of pi?I got 9pi Reply Link to post Share on other sites More sharing options...
Cesc Posted May 6, 2010 Report Share Posted May 6, 2010 Paper 1 TZ2 was really hard hopefully not worse than 5 though! what did you guys get on the log question? I ended up with 4. Reply Link to post Share on other sites More sharing options...
alexno Posted May 6, 2010 Report Share Posted May 6, 2010 Paper 1 TZ2 was really hard hopefully not worse than 5 though! what did you guys get on the log question? I ended up with 4.Yep i can confirm a 4, wut about question one where we had to find the p p(x-q)(x-r) i got 1/2 for p. Reply Link to post Share on other sites More sharing options...
Cesc Posted May 6, 2010 Report Share Posted May 6, 2010 yeah, that's correct.. I'm pretty confident about that one! how did you do on the probability question? Reply Link to post Share on other sites More sharing options...
alexno Posted May 6, 2010 Report Share Posted May 6, 2010 yeah, that's correct.. I'm pretty confident about that one! how did you do on the probability question?Wasn't too difficult, the box we had to complete was the hardest for me. 3 means that he missed the bus ones and didn't the other day, and 6 means that he got on the bus both times tight? Reply Link to post Share on other sites More sharing options...
luiz Posted May 6, 2010 Report Share Posted May 6, 2010 (edited) yeah, that's correct.. I'm pretty confident about that one! how did you do on the probability question?I'm pretty sure that the IB made a mistake in that question, and it got me stuck and I lost around 20 minutes (causing me not to have enough time for the exam)...It said that Jose misses the bus 2/3 times, and 1/3 times he obviously catches it. But then, in that table you had to copy and complete, under 0 euros, it should have been:(probability of missing the bus) * (probability of missing the bus)= 2/3 * 2/3= 4/9when they put that it was 1/9...Can anyone confirm this? I'm thinking about going to talk to my teacher... Edited May 6, 2010 by luiz Reply Link to post Share on other sites More sharing options...
alexno Posted May 6, 2010 Report Share Posted May 6, 2010 yeah, that's correct.. I'm pretty confident about that one! how did you do on the probability question?I'm pretty sure that the IB made a mistake in that question, and it got me stuck and I lost around 20 minutes (causing me not to have enough time for the exam)...It said that Jose misses the bus 2/3 times, and 1/3 times he obviously catches it. But then, in that table you had to copy and complete, under 0 euros, it should have been:(probability of missing the bus) * (probability of missing the bus)= 2/3 * 2/3= 4/9when they put that it was 1/9...Can anyone confirm this? I'm thinking about going to talk to my teacher...Hmm I think they did make a mistake Coz im pretty sure the probability he misses the bus was 2/3 so if he pays 0 euros mean he doesn't get on the bus at all (2/3)*(2/3)That means i screwd up my 6 euro box..... the probability he gets on the bus is (1/3) so if he pays 6 euro he gets on the bus both days (1/3)*(1/3)... damn Reply Link to post Share on other sites More sharing options...
Cesc Posted May 6, 2010 Report Share Posted May 6, 2010 the probability that he misses the bus was 1/3 I think.. 1/3 * 1/3 equals 1/9 so I don't think they made a mistake.. Reply Link to post Share on other sites More sharing options...
luiz Posted May 6, 2010 Report Share Posted May 6, 2010 (edited) the probability that he misses the bus was 1/3 I think.. 1/3 * 1/3 equals 1/9 so I don't think they made a mistake..Are you sure? I seem to remember that it was 2/3 he would miss it, and one third he would catch it...Anyway, in the end I gave up, and just put 0 3 61/9 4/9 4/9 Edited May 6, 2010 by luiz Reply Link to post Share on other sites More sharing options...
alexno Posted May 6, 2010 Report Share Posted May 6, 2010 the probability that he misses the bus was 1/3 I think.. 1/3 * 1/3 equals 1/9 so I don't think they made a mistake..Are you sure? I seem to remember that it was 2/3 he would miss it, and one third he would catch it...Anyway, in the end I gave up, and just put 0 3 61/9 4/9 4/9isn't 3 supposed to be 2/9? Reply Link to post Share on other sites More sharing options...
luiz Posted May 6, 2010 Report Share Posted May 6, 2010 the probability that he misses the bus was 1/3 I think.. 1/3 * 1/3 equals 1/9 so I don't think they made a mistake..Are you sure? I seem to remember that it was 2/3 he would miss it, and one third he would catch it...Anyway, in the end I gave up, and just put 0 3 61/9 4/9 4/9isn't 3 supposed to be 2/9?Nope, because it's the probability that he misses it on Monday and catches it on Tuesday (1/3 * 2/3) PLUS the probability that he misses it on Tuesday and catches it on Monday (again 1/3 * 2/3) Reply Link to post Share on other sites More sharing options...
alexno Posted May 6, 2010 Report Share Posted May 6, 2010 So could someone give me the answer for the area of the shaded region in question 10? the one where you had to express it in terms of pi Reply Link to post Share on other sites More sharing options...
luiz Posted May 6, 2010 Report Share Posted May 6, 2010 So could someone give me the answer for the area of the shaded region in question 10? the one where you had to express it in terms of piSorry I don't remember that question! :/ can you explain it more? Reply Link to post Share on other sites More sharing options...
alexno Posted May 6, 2010 Report Share Posted May 6, 2010 it gave you the function and the graph, you had to find some points on the graph,as well as the derivative. Then it asked to find the x intercept, i got 3pi/2. It then asked to find the area of the shaded region between 0 and 3pi/2. Oh and if i recall the function was f(x)= 6+6sinx. I got an asnwer of 9pi for the area of the shaded region Reply Link to post Share on other sites More sharing options...
luiz Posted May 6, 2010 Report Share Posted May 6, 2010 it gave you the function and the graph, you had to find some points on the graph,as well as the derivative. Then it asked to find the x intercept, i got 3pi/2. It then asked to find the area of the shaded region between 0 and 3pi/2. Oh and if i recall the function was f(x)= 6+6sinx. I got an asnwer of 9pi for the area of the shaded regionAh sorry I can't help with that one, didn't have enough time to do the integration... But I also got 3pi/2 as the x-intercept! Reply Link to post Share on other sites More sharing options...
alexno Posted May 6, 2010 Report Share Posted May 6, 2010 What about the question where it gave you the equation of a line parallel to the normal y=-1/8x i think, and you had to find k. What did you get for k? Reply Link to post Share on other sites More sharing options...
luiz Posted May 6, 2010 Report Share Posted May 6, 2010 What about the question where it gave you the equation of a line parallel to the normal y=-1/8x i think, and you had to find k. What did you get for k?Hmm. I remember doing it but I don't remember my answer, sorry! I just remember, it was like:the normal had gradient of -1/8, that * gradient of line at that point must equal -1, so the gradient at that point was 8.I don't remember any more. Sorry :/ Reply Link to post Share on other sites More sharing options...
alexno Posted May 6, 2010 Report Share Posted May 6, 2010 I think my k was 2 Reply Link to post Share on other sites More sharing options...
Cesc Posted May 6, 2010 Report Share Posted May 6, 2010 Oh and if i recall the function was f(x)= 6+6sinx. how did you do the "6+6sinx= 6" and "6+6sinx=0".. think I messed that one up Reply Link to post Share on other sites More sharing options...
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