Math Advanced Prediction/Thoughts (2 Viewers)

[stupidpersonlol]

omg theres hope i pass!!

 

[notme123]

cant wait for the 3u exam to be filled with perms and combs

dont jinx it man but at this rate all of q14 will be perms and combs

 

[stupidpersonlol]

dont jinx it man but at this rate all of q14 will be perms and combs

babes im screwed for ext 1 as well...if its like today

 

[CM_Tutor]

I got 0.066

As did I, but I'd like to check it again

 

[CopperPike]

I don't know if this was mentioned previously...but as the question asks for height above ground level, shouldn't the answer be 445m (so 345+100 above ground level)?

 

[stupidpersonlol]

View attachment 33772

I don't know if this was mentioned previously...but as the question asks for height above ground level, shouldn't the answer be 445m (so 345+100 above ground level)?

PLEASE NO

 

[RedNalick]

View attachment 33772

I don't know if this was mentioned previously...but as the question asks for height above ground level, shouldn't the answer be 445m (so 345+100 above ground level)?

I think because the equation already has the 100 in it, you don't need to add the 100.

 

[Jerryclover]

View attachment 33772

I don't know if this was mentioned previously...but as the question asks for height above ground level, shouldn't the answer be 445m (so 345+100 above ground level)?

No. The +100 in the equation y(t) accounts for that. But this question is fk'd up for advanced honestly, it's more of an ext1 question

 

[stupidpersonlol]

No. The +100 in the equation y(t) accounts for that. But this question is fk'd up for advanced honestly, it's more of an ext1 question

yea projectile motion came in handy

 

[Jerryclover]

As did I, but I'd like to check it again

sir, if you don't mind. Can you post your solutions to this problem(q33d)?

 

[Jerryclover]

what wait, i just differentiated it to find max turning point lol

I think that's the long way to do it... Since it's a concave down parabola, it will only have one maximum point which is the vertex..

 

[CopperPike]

No. The +100 in the equation y(t) accounts for that. But this question is fk'd up for advanced honestly, it's more of an ext1 question

Ah yes makes sense when I look at the eqn lol. That's a sneaky one I guess

 

[zbolland]

I think that's the long way to do it... Since it's a concave down parabola, it will only have one maximum point which is the vertex..

100% correct, 100 is already accounted for as well.

 

[CopperPike]

Raw mean mark for last year's exam was 38.1/50 and scaled was 28.4/50. I wonder how our cohort's stats will look like .

 

[Jerryclover]

oh i didnt see that, i was more so wondering why u thought it was difficult for adv

ah, ok. I was more so referring to the entirety of q26. If i hadn't doen extension 1, i would never make the connection to substiute y(t)= 0 for 26b. This is very similar to ext1 projectile motion questions, so yeah

 

[CM_Tutor]

sir, if you don't mind. Can you post your solutions to this problem(q33d)?

​

...using the -score of +2 (above the middle 95%) to mean top 2.5% and that 80% of them solve in under 2 h

 

[Jerryclover]

​

...using the -score of +2 (above the middle 95%) to mean top 2.5% and that 80% of them solve in under 2 h

Thanks for this

 

[zbolland]

Raw mean mark for last year's exam was 38.1/50 and scaled was 28.4/50. I wonder how our cohort's stats will look like .

Honest estimation, a 77-81 raw will amount to an 89-92 scaled this year. Last year the examination wasn't too bad, with the exception of the cricket question (which wasn't even bad at all). 2021, comparatively, will have a greater spread of results and a smaller percentage of those in the top 1-0.001%. The raw mean mark will be a lot lower.

 

[5uckerberg]

I know some of the solutions are wrong in this pdf I agree with CM_Tutor and Trebla.

View attachment 33772

I don't know if this was mentioned previously...but as the question asks for height above ground level, shouldn't the answer be 445m (so 345+100 above ground level)?

I find the second part is extremely questionable. I mean can you remove a factor of 5 from the question?

 

[5uckerberg]

could you check q25?

Q25's solution is very messed up. I mean what were they thinking.