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Re: HSC 2015 4U Marathon I think this belongs in the advanced marathon. I'm not sure of the difficulty because I haven't tried it, but the wording and notation are going to confuse people, and it is not the sort of question you will see in an HSC exam.

Re: Announcement from BOSTES - significant change to calculus courses Two positives about a formula sheet: (1) There will be less questions involving just subbing into a formula, and more that require actual thinking (2) It tells students what formulae they can't quote (eg. sums to products)

Re: Announcement from BOSTES - significant change to calculus courses Last I heard, the new syllabus was due to be in place for yr 12 2018. But given that this would mean it would need to be finalised by the end of 2016, I think that might be a little ambitious. But I guess a formula sheet...

Re: Announcement from BOSTES - significant change to calculus courses Other possibilities based on discussion that has gone on: (1) Extension 1 does only one exam (as was the case when I was at school) (2) The number of topics in each course to be reduced, with more emphasis placed on...

Restating that: If you are in an ellipsoid (not just an elliptical prism), if no radiated heat is lost to convection or other forms of dissipation, if the fire is located at a focus, and you are located at the other focus, then every ray of infrared light from the fire would hit you. The only...

It depends. Firstly, I'm not sure how much heat from a fire is transmitted by radiation and how much is transmitted by convection. My suspicion is that at any reasonable distance from the fire, most heat comes from convection. Only radiated heat reflects (it is infrared radiation) - convected...

Re: Announcement from BOSTES - significant change to calculus courses The formula sheet idea has been known for some time now. It gets mentioned regularly at in-service courses. I suspect it might be something more significant than that.

"Categorical" seems to have different meanings depending on who you read. Sometimes it seems to be synonymous with "qualitative" (rather than "quantitative"). Other times it seems to be a more general "discrete" (rather than continuous). Using the first definition, it would mean "nominal"...

Re: HSC 2015 2U Marathon The person you are referring to IS a 2015er.

Re: MX2 2015 Integration Marathon That would depend on how you define an asymptote. I believe some sources actually define it as the limiting tangent.

For a start, if the question does say "find the number of years", there is no need to round. It is not asking for a whole number of years. The exception is if something is increasing on a specific date every year. But then it is not exponential growth because the growth is not continuous - it is...

I don't know. Someone once suggested that to me - that is all.

Will your little sister beat you up if you distribute the paper?

Is he really a "he" ? I had heard otherwise.

So when I look at the state rankings, how will I know if this person is on the list?

I think I finally figured out your name. I'm guessing you won't be doing any study after 5:45 this afternoon?

Ahhh .... so no-one can tell you've been visiting the Neighbours and Home and Away forums?

Just wondering why the little light next to your name never comes on to indicate you are logged in?

I think it's simpler to think of it as coming from l=rθ The area of a thin annular sector is approximately equal to the arc length times the change in radius.

Check out this link: https://www.youtube.com/watch?v=nqNzKeVCYBU But ... you will need to understand double integrals and polar coordinates.