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First, let me start with an apology that this process has taken much longer than expected. Second, here are the distributions of answers for the MCQ: The most difficult questions, based on the rate at which the question was answered correctly, were questions 5, 14, 11, and 2. The easiest...

I came across this question as an MCQ and don't agree with any of the answers, so I'd like to hear what you think would be the answer. A student wishes to determine the concentration of a solution of lead(II) cations by using a precipitation titration. A 25.00 mL sample of the solution is...

Excerpts from Ocean Vuong's On Earth We're Briefly Gorgeous made an appearance in English Paper 1. In The Guardian today, there is an article about Vuong bombarded on social media and some of his responses to comments made. This is not the first time that an author whose work is used in an HSC...

As many of you are probably aware, I have begun a discussion of the 2021 BoS chemistry exam, and I thought I'd start one for the MX2 paper as well. For those who have not seen the paper, Trebla has posted it at...

The 2021 BoS Chemistry Trial is now publicly available - Trebla posted a link in the thread in the general discussion forum: https://boredofstudies.org/threads/bos-trials-maths-and-chemistry-2021.397055/page-2#post-7399485 As the person who wrote it, I'm interested in any feedback, either...

News article https://www.smh.com.au/national/nsw/hsc-may-be-delayed-until-november-with-fewer-exams-20210825-p58lwx.html from the Sydney Morning Herald, posted online at 6:21 pm on 25 August. Note that there is not yet any official decision ... HSC may be delayed until November, with fewer...

An article in The Guardian today: Alternatives to the ATAR: "Most kids don't know about them" Certainly worth a read, in my opinion. The ATAR is not the only way into University study, nor is an ATAR below your goal and end to the chance of studying your chosen course or at your chosen...

I encourage all MX2 students to have a look at the following thread in the MX1 forum: https://boredofstudies.org/threads/vector-projections-qs-help-plz-ugrent.394192/ The third question sounds simple but I believe it has been set in error as there is no simple solution. The posts in the...

I know that \overrightarrow can be used to produce a vector like \overrightarrow{AB}, but I can't find a way to represent vectors like \overrightarrow{i} and \overrightarrow{j} using the tilde notation. Is there a way to do this within forum posts? Thanks.

Does anyone recall seeing a Trial or HSC question that dealt with the inverses of sec, cosec, or cot? I saw one recently on sec-1x and am wondering if it was a one-off or if there are more that have appeared in past exams. Thanks

Prove that if M \notin \mathbb{Z} but M + \cfrac{1}{M} = \cfrac{M^2 + 1}{M} \in \mathbb{Z}, then M^n + \cfrac{1}{M^n} \in \mathbb{Z} for all n \in \mathbb{Z}^+. I am curious as to how Extension 2 students would approach this as a proof problem, and wondering if there are other approaches beyond...

At the end of the help section at https://community.boredofstudies.org/help/bb-codes/ there is help for latex codes that contains int_{1}^{2} x^{2} - 1 I think is meant to be an integral, and thus something like \int_{1}^{2} {x^2 - 1} dx Perhaps this could be fixed? Also, is there are a...

I was asked to post some more questions. The following are in no particular order, and focus on no particular topic, and vary in standard... 1. ABC is any triangle. Show that (a) tan A + tan B + tan C = tan A * tan B * tan C (b) sin A + sin B + sin C = 4cos(A / 2)cos(B / 2)cos(C / 2)...

for the snow for a week's holiday this weekend. :) So, the last time I'll be around before going will probably be Sat AM, and I won't be back until late on Sun 18th. If there are any things people want to ask about before I go, please post here. Also, if things come up while I'm away...

1. Consider the sequence a₀, a₁, a₂, ... which is an increasing sequence of real numbers (ie a_n < a_n+1 for all non-negative integers n), defined by a_n+1 = 2ⁿ - 3a_n, for n = 0, 1, 2, ... (a) If the first...

In another thread, nike33 asked for some more interesting parametrics questions, so here we go... 1. P(2ap, ap²) and Q(2aq, aq²) are two points on the parabola x² = 4ay. The tangent at P and the line through Q parallel to the axis of the parabola meet at R...

Before I post any questions, I would like to make a couple of introductory comments about conics. Most students don't like conics, saying it is hard. I disagree. This is (conceptual) a relatively straight-forward topic, based mostly in simple co-ordinate geometry and calculus. What makes...

There has been a discussion of some of the harder stuff that can turn up at the ends of papers, so I thought I'd post some stuff from later questions of some 4u half-yearlies I have. I've skipped the motion, as people probably haven't done it yet, but please advise if I'm wrong... 1. (For...

Why do the subscript codes < sub > < /sub > (but without the spaces) not seem to work in some parts of the Chemistry forum. I just wrote a post using them in the Acidic Environment part of the forum, but they aren't working (thread on "Chemical Salts????????"). Can someone please have a look...

I thought I might post a few pieces of advice that might benefit you all. Anybody with Uni experience, feel free to add add in some more hard won lessons. Lecturers know You might think that you are essentially anonymous in a lecture theatre of 150 people - unless you draw attention to...