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You can break it up into two parts. 1 - The time t0 taken for the pebble to drop down to a distance h. 2 - The time taken t1 for the sound to reach the observer from a distance h. For the first part you can get the equation h = \dfrac{1}{2}at_0^2 For the second part you can get the equation h...

This is from the 2014 4U hsc..

It’s from the 2018 4U hsc. Answers are up there.

Yeah just let it out. We’ve all done this at some point. I used to think and still do think there is no reason to have compulsory English in year 11 and 12.

Oh wow that’s absurd. One cannot even imagine what the Jews went through.

Yep. I suggest you get an app called Desmos since it’s quite useful in many scenarios like this one.

You need to graph cosx and the absolute value function separately and then find points where they cross each other in order to find when they’re equal. You don’t need to graph the whole thing as one function.

cos2x = 1-2sin^2(x) However as x -> 0 sinx approaches x. So you have -2x^2/(x^3 - x^2) Cancel out the x^2 from the top and bottom. = 2

Depends quite a lot on the subject. I don’t think I’ve ever seen a major tutoring centre that’s known to be good for everything. If you need a tutor for your needs as you suggested I would probably recommend not going with a tutoring centre. In my experience they are pretty fast paced and...

Yeah my 4U teacher was absolutely crap and taught us absolutely nothing. Literally no one would show up to class on time including me, however I can’t even make a good excuse for why I’m late because she’s my neighbour.

The students on here tend to be skewed towards the upper end.

Dam I had no idea it was that serious! Do you use sunscreen?

How does a sunburn feel? Does it feel like a normal burn say if you were to accidentally touch something very hot. I’ve never had a sunburn due to the fact that my skin tone is brown.

Happy Australia Day to you too. No idea how you can go to the beach at 40 degrees. Especially here in Australia where the sun is piercing.

Nice job! You should attend the BOS trials this year because you seem to really like Maths.

My go to excuse was I left the book I did it in at home, and obviously the teacher would forget about it the next day.

Last 10 years?? Maybe 2010? 2010 had a pretty nice final question.

Bruh. A gang literally has one of their chapters in Blacktown.

I know some but what Ive found is it sounds funny when interpreted literally in that language for the people that understand it. Translating it to English makes it lose it humour.