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Re: International Baccalaureate Marathon I thought it was a typo in the book.

Re: International Baccalaureate Marathon Well I tried subbing in Un=4882.8125, then tried Un=8215 both didn't get me the answer which was n=7/ This was my working out: u_n=u_{1} r^{n-1} 4882.8125=20 \ (\frac{5}{2})^{n-1} 244.140625 =(\frac{5}{2})^{n-1} $ Taking logs of...

Re: International Baccalaureate Marathon Came across this question this morning, Maths SL Cambridge EX 6E, Q 2 (ii), I think there is a typo in the question or something. The answer for (ii) is n=7 u_n=u_1 \ r^{n-1} $ In this question $, u_{1}=20, r=\frac{5}{2}, u_n=4882.8125...

Re: International Baccalaureate Marathon I guess my thinking is why wouldn't you have a \pm sign for the worked example as well?

Re: International Baccalaureate Marathon Came across this question tonight in the Maths textbook Eg 11.7 , part(b): Can anyone give some confirmation as to whether there is a mistake in the solutions for Q 10 (a)? As you can see the questions are the exact same as the Worked...

Re: International Baccalaureate Marathon There are 15 schools in NSW that offer the IB. I would be keen to know which Options, as part of the Maths HL. Would be keen to know which Options each of the 15 schools offer?

which schools teach which options? I take it Rebeccazhong learned the Calculus Option.

Confirming there is a mistake with this question for Cambridge Year 10 EX 1D Q8. $ (a) Area= $ 66m^{2} $ (b) Two bags of cement $ = 5m^{2} \frac{2 \ bags \ of \ cement}{x}=\frac{5}{66} x=26.4 bags $ I then rounded the answer up to 27 bags, as the required amount for...

My thinking is if they say 'Hence, prove AE||CD' , if they use those words specifically , you have to refer to 'corresponding angles' in your answer.

Question 7B OK with this question tonight, I thought for the life of me it was an alternate angle reasoning. The books answer is: \angle EAB=\angle DCB $ (corresponding angles in congruent triangles ) $ \therefore AE || CD $ (alternate angles equal) $ I understand the last line but...

Re: International Baccalaureate Marathon Also if anyone has an IB past exam papers or tests from their schools, it would be great if you could share it whether it be a school in NSW, Australia wide or internationally. Cheers

I was also surprised to know that there is a Campion bookstore franchise here in NSW, its based in Artarmon. I thought Campion was a WA based company only having operations over there.

I brought over a couple of A.J Sadler books from WA to NSW. Love the good old Sadler books but sadly the standards of those books are alot lower compared to the ones in NSW. ( Just used to hate the Rossmoyne kids bragging about how they had good resources/the best teachers in the state there...

After going through all the majority of the chapter, on "Properties of Geometrical figures" in Cambridge for 5.3 Year 9 , I will look to do one of a similar chapters in Signpost or New Century.It's the only topic that I need more brushing up on. (plus I also enjoy it)

My bad , I should have said CA=CE (given) angle ABC= angle EDC (alternate angles, AB||DE)

Re: Year 9 & 10 Maths Discussion Thread 2017 I didn't see much congruency of triangles in IB maths so I am slightly behind in that aspect. I was having a quick look at the SL and HL textbooks, they don't have many congruency triangles and/or circle geometry. Like with any topic you have to put...

Re: Year 9 & 10 Maths Discussion Thread 2017 I know this is a stupid thing to say but when you go back through the Year 9 and 10 NSW maths books, especially with the curriculum here, you pick up and learn little notations, ways of writing of triangles (in relation to congruent triangles) that I...

Re: Year 9 & 10 Maths Discussion Thread 2017 ^^^ I have an assumption in this question, they they have done parts (a) and (d) for us already. But if someone wants to correct me, do so.

Re: Year 9 & 10 Maths Discussion Thread 2017 I was a bit confused by the wording of parts (c) and parts (d) and (e). I also don't get how you can use a compass to see the two points where they can be at two different places. I was thinking it could only be 1 point for each triangle...

Re: Year 9 & 10 Maths Discussion Thread 2017 Speaking of the Cambridge maths book, there is a slight error in EX 7D Q7. \triangle PBR \equiv \triangle FDE $ is wrong as they are missing the double strike for $ \triangle FDE $ in the answer. $