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I got y2 = 20 - x2 (Did I do something wrong?) Unfortunately that doesn't work. From that, you get: (1/2x)(x) [rectangle] + 1/2xy [triangle] = 1/2x(x+y) [trapezium] i.e. 1/2(x+y) = 1/2(x+y)

Thanks for the answer. I notice now that you can get the same answer by doing 8P5 / 5 for one table (since 8P5 gives you the number of possible arrangements in a straight line, which can be divided by 5 seats to get the number of arrangements for a circle) multiplied by 2! (or 3!/3) for the...

e.g. How many ways can 8 people be seated at two tables with 5 and 3 seats each? How do I approach this problem? Also, my teacher used this question as an example to say that we should always learn the formula as n!/n and not (n-1)!. I don't understand that, can anyone figure out why he...

1. Temperature - higher temperature means more kinetic energy, so molecules collide faster and more often (also more of them will have the required activation energy), therefore increasing RoR. 2. Surface area - higher surface area means more particles are exposed to collisions, so collisions...

Hi all, I'm going into Year 12 and I plan to study English Adv., 4U Maths, Chemistry and SDD. I attend a top 10 school - approximately how would I need to perform relative to my cohort to get a mid-high Band 5 in English? Also, is it likely that I can get a mid-90s ATAR or more if I get...

if you meant that literally, that's not quite true. If you look at the UAC scaling report for 2016 (table A3), Genny Maths always gets scaled (down), so the kid who gets 100 in Genny isn't put on the same level as the kid who gets 100 in 4U. The table suggests that a maximum HSC mark of 50.0 in...

what are some essential qualities of a biopolymer? Biopolymers are polymers that are produced by living things. As well as that, they need to fit the definition of a polymer (a large molecule made from the chaining of one or more repeating smaller units called monomers. why will biopolymers...

You can find the new HSC Chemistry syllabus here. https://syllabus.nesa.nsw.edu.au/assets/chemistry/chemistry-stage-6-syllabus-2017.pdf

1. I'm not sure about mercury since we didn't ever talk about it in class. Mercury is a metal so it should exist as a metallic lattice, not as molecules. Perhaps the forces holding the metal cations together are weaker than they are in other metals. 3. Nitrogen's valency is 3, and oxygen's is...

Boiling and melting point is determined by intermolecular forces between molecules. e.g. between water molecules exist hydrogen "bonds". When substances change states from liquid to gas, all the molecules break away from each other. Stronger intermolecular forces make it harder for this to...

For all my subjects I made typed notes. For Physics (and Chemistry) I also structured my notes around the syllabus dot points. For Maths I did exercises in a book but I typed out important formulae and concepts in a document.

how is that a waste of time? 3 units of work = 3 units for HSC. And it's not like 3U maths scales poorly or anything. also many uni degrees require or assume knowledge of 3U maths, so if you wanted to do one of those, 3U would be better than 2U.

I'll have a go at the question: 1 mol CH4 + 2 mol O2 -> 1 mol CO2 (the water isn't relevant here so I'll leave it out for simplicity) Because of Avogadro's Law (equal volumes = equal moles at same temp/pressure) we can treat volumes like moles here. So let's replace 1 mol with 50 mL. 50 mL...

I messed up in Maths HYs. I did technically get ~40% but it's probably not as bad as it sounds. The student-made memes that teachers hung up in a Maths classroom are a testament to how jarring the test was; I think our class average was below 50% as well and the best marks in the year topped out...

Screwups in Year 11 usually don't carry over to Year 12 so it's not a huge deal. It happens all the time, including to people in selective schools (it happened to me too in the HYs). The important thing is that you make an effort to improve so you don't have a repeat in the HSC (where it does...

Yep I go SBHS. :) I didn't find the 2U content hard to remember, but applying it was a bit harder for me. I think I'm getting average marks so far. How does the 2U mark not counting in 4U work? A few people told me that the 3rd and 4th units of 4U count as 2 units each; is this true?

Alright then. Thanks a lot for the help.

What's this then? https://www.futurestudents.unsw.edu.au/degreetool/engineering/computer-scienceengineering-hons Anyway, won't the physics taught in uni require parts of HSC Physics as a foundation? Specifically the formulae and the concepts in electricity.

I want to do Comp Eng + Comp Sci at UNSW. The course says 3U Maths and Physics are assumed knowledge.

My other subjects are SDD, Chemistry and Physics. Physics is the one I'm doing least well in, but it's assumed knowledge for the uni course; SDD and Chemistry are my two best subjects so I don't want to drop them either.