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Re: HSC 2015 3U Marathon ohhh, since we're assuming that for n=k, fk[x] has roots -1,-2,....-k, we can put 'a' as anything? For example a = 2 , because it still has roots -1,-2,...-k. Is this what you're saying?

was that the one where you got to compare the coeff of x^2 and, the coeff of the RHS was 1 +n/2 C something ??? so you had to discuss odd/even?

done

Re: HSC 2015 3U Marathon Helppp, my method requires me to prove a= 1/k! , from the pattern I know that a = 1/k! , but can someone help me prove it? Is it enough proof to assume a = 1/k! http://imgur.com/hTxQZ4s

Re: HSC 2015 3U Marathon sorry if my working is dodgy, I didn't expand S(x) due to no space http://puu.sh/kWGGs/97b30cbbe8.jpg

Re: HSC 2015 3U Marathon i] if you choose one ball, there are two possibilities, a red ball or a blue ball if you choose two balls, there are three possibilities, 2 reds, 2 blues, or 1 red 1 blue if you choose three balls, there are four possibilities, 3 reds, 3 blues, 2 red 1 blue, or two...

eat a banana before the exam, refills your brain

I have them if you still want them

Re: HSC 2015 3U Marathon yes

Re: HSC 2015 3U Marathon A stone is thrown so that it will hit a bird at the top of a pole. However, at the instant the stone is thrown, the bird flies away in a horizontal straight line at a speed of 10 m/s. The stone reaches double the height of the pole and, in its descent touches the bird...

Re: HSC 2015 3U Marathon EDIT: already been done above, I took too slow Is it a = 2 metres? 120/15*4 = 2

Re: HSC 2015 3U Marathon Do the under the ceiling condition first, you found max height in part i], so let the max height = 8 solve for theta and you will get 76*39' because the angle has to be acute (in first quad), secondly you need it to be over y = 3 when x = 3, therefore let x = 3, y =...

what aligned mark do you need in 4u to beat a 99 in 2u ?

Are you allowed to use the world similarly? for example, you're using the same proof twice in circle geo for different angles, are you allowed to just write 'similarly' <PRQ = <RMO + <ROM

Re: HSC 2015 3U Marathon How did you integrate the LHS, I tried substitution but it got ugly

what would a 97, 98, or 99 align to? raw

If you're doing 4u next year, what happens if your 4u aligned is scaled less than your 2u? Are you allowed to choose your 2u mark over your 4u mark?

for 15 c) ii] and iii] , I simplified 80/0.5 to be 40 instead of 160 would I get 1/2 for ii] and 0/1 for iii] or since the concept was right, would it be 1/2 for ii] and 1/1 for iii]?

I wrote 100% working out on every question due to paranoia haha, used AAA similarity cause the top and base of a cylinder is parallel

+1