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astonky last won the day on November 8 2016

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  1. Hi, For my homework, I need to solve the following question: Given that cos a = 4/5 and cos b = 7/25, find the possible values of cos (a+b). What I have done so far is this: Using compound angle identites: cos (a+b) = cos a cos b - sin a sin b Therefore: cos (a+b) = (4/5)*(7/25) - sin a sin b I now used a calculator to find the values of cos a and cos b to find the values of sin a and sin b. Thus: sin a = 3/5 and sin b = 24/25 Then substituted back into compound angle formula: cos (a+b) = (4/5)*(7/25) - (3/5)*(24/25) Simplifying gives me 28/125 - 72/125, and thus cos (a+b)= -44/125. Then I found the angle cos (a+b) using a calculator: 111° And used that to find the second possible angle: 180°-111°= 69° Then I did took cos (69°) to get the second value of cos (a+b), which according to the calculator is 0.351. But according to my textbook answers, the second value of cos (a+b) is 4/5. Can you help explain where I made a mistake, and even more is there a shorter way to solve this type of question? Thanks for you help.
  2. Hi, even though I'm still in the first year of the IB, I'll try to give you some advice. Geography is my favourite subject, so I spend pretty much 30% of my overall study time revising it. The first thing I would do (if you haven't already) is to find the geography syllabus and identify all the sections you're being tested on (ie. Core themes, HL extension and the 3 options that you are doing). Each of these are divided into different sections that have fairly clear requirements on what you need to know. If you're aiming for a 7, you will want to ensure that you know the demands of each of the sections. - if you are lacking materials to study from I can recommend, or this site specifically for IB HL Changing Space - the Shrinking World. Ok, assuming you've got all the necessary material for your revision I would suggest that you condense all the information in the shortest form possible (but without comprosing the quality of the information). Then, there are two study strategies I can recommend (both are about equally effective). The first involves lecturing the information from your notes to an imaginary class (ie. repeating it out loud). The second method is rewriting 2-4 pages of your notes in 20 minutes. The lecturing method can be faster and is less harmful to the environment - you save paper - but if you're not the type of person who likes to speak out loud, or you're revising in a quiet place such as the library, you'll prefer the second method. Both of these methods work because you're forced to recall all the information without any stimulus material, so don't go peaking at your notes while you do this. Finally, I recommend that you practise your exam skills and timing using past papers, as particularly in Paper 3 where you need to write 2 essays in 1 hour, you need to be able to manage your time well to score the maximum number of marks. If you've got any other questions, don't hesitate to ask, I'll answer them as best as I can. Greetings.
  3. Yes I understand what you say about paper 1, but getting exposure to as much new vocabulary as possible should help. And in the exam you have the line numbers given to you for guidance, so even if you don't understand much of the text you should know where you can look. For paper 2 choosing two of the optional topics could work, but if you really want to maximise your potential to score high, I recommend that you study all of them (at least briefly, but you can focus on health and free time more intensely) so you can be sure to find one in the six questions that you like and write a text type you enjoy.
  4. Aside from doing past paper 1 and 2 questions and having your teacher correct them, I suggest you do the vocabulary and grammar exercises on I also use this site for practicing vocabulary and grammar and it helps me a lot. Also the site has "anuncios", "telediarios" and "traileres de películas" for you to practise understanding and applying vocabulary and grammar. If you struggle on Paper 2 it is best to practise writing a variety of text types (eg. 1 text a week, maybe a newspaper article this week, then a blog post, and then a letter) and having your teacher go over all the mistakes with you.
  5. Or for part (b) you can also start solving it algebraically: u1*rn = 40 (establish equation using the formula for geometric equations in the formula booklet) Rearrange the equation: rn = 40/u1 Substitute for u1: rn =40/(1/81) So: rn= 40*81 which is 3240 Using logarithms: log3 3240 = n On a non-calculator find out 3 to the power of what number is greater than 3240 using trial and error: eg. 35 = 243 36 = 729 37 = 2187 38 = 6561 On a calculator just use the log solver to find that n = 8
  6. Dear Amrutha, It is definitely possible to do an internal assessment on migration (or another topic from Populations in Transition). It may however be that the IB does not encourage this, because of: inappropriate assignments submitted by other candidates in the years before the difficulty of collecting primary data for this topic These are the reasons I suspect, so they may be different from what your teacher finds out for you. Both of these reasons, however, do not rule out doing an internal assessment on the Populations section (though I believe that this section has been overdone, so you may want to find an interesting angle to your investigation that is unlikely to have been previously investigated). Nevertheless, you should be able to select an appropriate subtopic , explore relevant theories studied in your course (eg. Lee model of pull and push factors, Zipf's inverse distance law of migration, Earnst ravenstein Pattern of migration, and Stouffer model of intervening opportunities) and find a suitable method of investigation. BTW, what options are you studying? As you're from Brunei, you may be able to do an IA on the options: coastal margins, extreme environments, hazards and disasters, or you could do something related to urban environments, which should be possible in most places no matter the geographical limitations.
  7. According to my Geography teacher, the current syllabus should be valid as well for 2018, as else one should have been published by latest June 2016. But she also said that the IB may be running late this year, so to be 100% sure, I would wait till February 2017. If by then no new syllabus has been published, you should be tested on the current syllabus.
  8. Yes my teacher says that leisure sport and tourism and urban environments are the two easiest topics
  9. Yes, and urban environments.
  10. I'm the type of persom who thinks that Geography is easy (but only if you know how to study for it). The key in this subject is to look closely at the syllabus and make your own notes that cover each bullet point in the syllabus. Notes This may sound easy at first (and it is easy provided your teacher gives you great notes) but else you may struggle to find information online. Some helpful websites include: You'll probably need to consult other websites for your research, and in particular for the case studies (though I'll talk about case studies later in this post). The idea is for you to create comprehensive notes on all syllabus topics, including relevant and annotated diagrams - you'll need these for the long-responsive questions in the exams. Studying After you have a set of notes, there are two main ways for you to practise from these materials. The first way involves reciting everything you remember from your notes out loud, then go back to your notes and look over what you forgotnto mention. Take a short break and recite everything you remember now. Then look over your notes again. Repeat this process until everything is commited to memory (but don't learn your notes verbatim excluding definitions). This step works for up to 4-6 pages or up to 30 minutes at a time, depending on your experience with this method. If you're not fond of reviewing out loud, you try to reproduce your notes from memory, including the annotated diagrams. Then review your initial set of notes to see what you missed. Repeat on a different occasion (different day, or a few hours later). Finally, you should train your exam skills by doing past years papers (you can get them from your teachers) and reviewing them with the mark schemes (also from your teachers, or ask your teachers or me to correct them for you). Ideally you may have access to subject reports, these are documents which describe common student mistakes in the subject, and thus pinpoint as to what you should avoid. Case Studies Contrary to popular belief, you don't need to know insane levels of detail. 2-3 stats on each subtopic should suffice provided you can relate them tomthe argument and analyse them in the context of the essay question. Exams In the SL exam, you'll be taking two papers: Core themes and Options. As for Paper 1 Core Themes you'll have 4 large questions with subsections that require short-answer responses. The first question of each subsection asks you to interpret a diagram for which you should state the general trend, the anomalies and use evidence (figures) to back up your claims. The next questions are based on the theory, and the final question tests your case study knowledge as well as the theory. In these questions you should apply the theory to a suitable example, and then use a statistic to substantiate your claims. After these four large questions (one on each of the themes), there is one last large question in Paper 1 worth 15 marks. This question not only tests your theoretical knowledge but alsomyour essay writing skills. Aim for 1.5 to 2 sides of writing including a labelled diagram. First define the key vocabulary in the question, and then relate it to the argument of your text. In the body paragraph discuss evidence for your argument and evaluate counter-claims. Include a diagram to impress an examiner. In your conclusion restate your argument and the majn evidence supporting it. If possible link it to a recent issue (end using recent stats). In the options paper you'll have theory questions along a similar format of those in Paper 1, followed by a 10 mark essay (same strucutre as 15 mark just more condensed). Then you'll also have to do a 15 mark essay, as in Paper 1 (I think please correct me if I am mistaken as I do HL). I hope that covers it.
  11. Hey everyone, Could you please help me on the following question? Solve the following system of equations. logx+1y = 2 logy+1x = 1/4 I understand how to start ie. (x+1)2=y (y+1)=x4 Then, (x+1)2= x4-1 Can you explain the steps I need to do next to solve the equation. I found the answers, but I don't understand how anyone would procede from where I stopped. x = −1, not possible x =1.70, y = 7.27 Thanks for your help
  12. List of Useful Websites for IB Geography SL and HL View File I've gathered the best geography resources I could find for IB students. Greenfieldgeography and The Geographer Online have materials for all the topics, while IGCSE Geography and Budding Geographers are still developing fresh content. IGCSE Geography has just released a great online course on time-space convergence. Submitter astonky Submitted 10/14/2016 Category Geography  
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    I've gathered the best geography resources I could find for IB students. Greenfieldgeography and The Geographer Online have materials for all the topics, while IGCSE Geography and Budding Geographers are still developing fresh content. IGCSE Geography has just released a great online course on time-space convergence.
  14. A blog post will have a catchy title about your topic (think advertising/leaflet style), for example: The Ultimate Guide to Acing the English IGCSE Motivation and Success: An Interview with Ramit Sethi The title is followed by the date and the name of the author. Then you usually have a title image (often a photo) related to the topic. Your blog text should be informal and familiar. Blogs often use really short paragraphs, but about 20-40 words each (1-3 sentences). For the IB, you conclude the written task with a "link" to your blog, eg. Source:
  15. Hi everyone, Our TOK teacher has given us a practise essay (1,100 words) on the topic "Who am I?" Would you answer the question "Who am I?" in response to your personal life, or would you analyse the question and try to find a common "I"/ define or describe your perception of "I" ? Your feedback would be of tremendous value. Thanks.