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owned!

Is that not assumed?

Oh yeh actually, i agree, it should have said if they pick n-r blue and red balls, and r white balls

It is one of the easiest

I'm not going to worry about predicting, because that means I may not prepare for all topics(although, hopefully i am prepared by now :s), you never know, they could chuck a graphical question in their or a rate of change trig one.

it depends on how your cohort goes, if the people ranked above you perform in accordance their rank, and you perform in accordance to your rank, your final HSC mark should be 95~.

a square root cannot be negative, it is just 9

No, because on day 12 there were 55296 members, but on day 11 there were 27648 and so on. So for each day they earn 0.5 c for each member, so you are earning more than 0.5c for a member that joined on the first day, so you have to take the sum of the members from day 1-12 and you get $553 :)

It said "per person per day", so you had to find the sum of the members up to day 12.

No i don't think that is right. You never get your scaled marks anyway, only your aligned marks, and you do not have to sit english for you raw marks to be aligned, so i'd be pretty sure that 72 is what you got sorry :(

someone has already posted it on here

The answer is -2, not 2

it said to nearest dollar :)

I got that as well, but then i realised after the exam that the increase for each time the intensity doubles is not linear. so it doesn't increase by a fixed percentage, rather a fixed amount of decibels, so the answer is 10ln2 not 2.5% increase

1:2

120 lol jk

Square roots are only positive or negative if stated, or when you evaluate them from taking the square root of a square. if there is a number, e.g. sqrt 100, it is only equal to 10, NOT -10

88~

and hence the ratio was 1:2??