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Here is the paper. https://www.educationstandards.nsw.edu.au/wps/portal/nesa/resource-finder/hsc-exam-papers/2022/mathematics-extension-1-2022-hsc-exam-pack

Yes. I think pc misunderstood the question. The question didn't say equate the two formulae and solve for n. It said when will the value of the machine be equal to the salvage value found in part (a) (ii) using the straight-line method. You don't have to use the method that teacher did. You...

Having said that though there seems to be a discrepancy in solutions to 27b teacher solutions: pc solutions EDIT: This discrepancy has now been fixed. Go back to post#4 at https://community.boredofstudies.org/threads/standard-maths.401643/#post-7440848 and re-download for corrected version.

Thanks. It's good to have alternative versions of solutions.

The Standard 1 and 2 papers are at https://www.educationstandards.nsw.edu.au/wps/portal/nesa/resource-finder/hsc-exam-papers/2022/mathematics-standard-2022-hsc-exam-pack I haven't seen any Standard 1 solutions yet but those solutions will eventually go up at...

I think they should have mentioned positive correlation in Q35. Some were common with Advanced and if you look at the solutions previously posted for the Advanced paper Q24 by 2xq, John Drake and romeo you see they all mentioned positive correlation

Some of you may have seen that the Standard 2 paper was in this post: https://community.boredofstudies.org/threads/advanced-maths-predictions.401530/#post-7440329 But now there are solutions as well. They are attached here. They are by "teacher".

Well if you look back at Lkc36's solutions from a previous post it is explained why it is indeed B

Oh yes so v changes direction and hence so too does -0.1v. So I think we can concur now that 39.1 is the correct answer.

For 16b, with resistive force acting in the same direction as when it goes up as it goes down you get 39.1 as has previously been demonstrated. However if you assume the direction of resistance changes when it goes down you would expect the value will have to increase slightly in order for it to...

There is a new article on it at https://www.smh.com.au/national/nsw/is-this-one-of-the-toughest-hsc-maths-questions-yet-20221021-p5brpl.html but they didn’t acknowledge their old video had to be replaced. Seems like they are just trying to save face.

Well that's much better. I've attached a screenshot again

BOS has defeated SMH. The errors spoken about previously here on BOS have embarrassed them enough to remove the video. If you click on the link now you get

It is in this post: https://community.boredofstudies.org/threads/advanced-maths-predictions.401530/#post-7440329

Yeah. It is going to be interesting to see what matrix eduction, Terry Lee and itute do now. Let's hope they don't just copy the Sydney Morning Herald's answer.

On the other hand the solution to 16b that the Sydney Morning Herald put up last night has a different answer 33.6 m/s but I reckon she is wrong. https://www.smh.com.au/politics/nsw/the-hardest-2022-maths-extension-2-exam-question-explained-20221020-p5brm4.html To save you the agony of...

Looks like Lkc36's solution concurs with your answer.

Here is another set of solutions by MOK - slightly incomplete as it did not have a serious attempt at 16b, but that is done in Lkc36's solutions who got 39.1m/s.

Now we have the 2022 Ext 2 HSC paper we can add some more proofs questions to the list. I would say add Q2, 3, 7, 12a, 13a, 13b, 14b, 16c And for now can find the paper in this post: https://community.boredofstudies.org/threads/maths-extension-2-thoughts-and-feelings.401616/page-2#post-7440412...

Here is the solution by Lkc36 who has beaten Terry Lee to it