Hard maths questions for higher maths GCSE

Is this correct? I skipped some steps as it isn't an exam.

Yep, that's fine - what I'd have done though would be to use the difference of two squares: $a^2 - b^2 = (a-b)(a+b)$, to get:

$(x+7)^2 - (x-3)^3 = (x+7 - x + 3)(x+7 + x - 3) = 10(2x + 4) = 20(x +2)$ but your method is entirely correct and is likely the intended method at GCSE, well done!

This

This calculator paper question

Yep. All correct.

lol that's supposed to be an N² also i hate this question i still don't know how to do this... it was on my GCSE ;/

lol that's supposed to be an N² also i hate this question i still don't know how to do this... it was on my GCSE ;/

I don't get where you got the 10 from, have a look at mine, the number 100 or 10 doesn't come up but the answer is correct?

I don't really know how to use latex so apologies for the mess...

6/n * 5/n-1 = 1/3

30/(n^2-n) = 1/3

30 = (n^2-n)/3

90 = n^2 - n

n^2 - n - 90 = 0

it was that easy?...

FK this shiz, i drew a bloody huge tree diagram for this bull and i didn't get **** from it >.>

You could do the tree but would only need to branch off for orange x orange. Knowing that you could trial and error a few simple cases and very swiftly arrive at N = 10. No idea how many marks that would get you but I would assume at least one method mark and possibly the answer mark

When I was taking GCSE papers a few days ago I think the probability questions were easier than this one as a tree yielded a reasonably simple answer, and that is the method I assume they teach in school (I never did GCSEs in school).

Oh well. No point dwelling on it now!

stupid tree o.o cost me a few marks, i always did them my way and they always worked and i decided to experiment in the actual thing >.>
at least i still came out with an A*

Well it's all good then

i'm gonna slap me in the face, i filled the whole page with stuff and didn't get an answer -.-

I'm curious. Can you post your working?