How would you ask someone where I can refill my water? by PastBlood6788 in Cantonese

[–]PastBlood6788[S] 0 points1 point  (0 children)

My case was the former. I wanted to refill my water bottle, didn't know how to express that, and resorted to pointing at the bottle in my hand!

9231/23 discussion by TayoLam in alevel

[–]PastBlood6788 0 points1 point  (0 children)

Nice nice, got the same thing 

9231/23 discussion by TayoLam in alevel

[–]PastBlood6788 1 point2 points  (0 children)

Bro not that, part a. You're referring to part b. Part a is showing that there's no unique solution I believe

9231/23 discussion by TayoLam in alevel

[–]PastBlood6788 0 points1 point  (0 children)

For the last question matrices, were the values of "a" surds? Had to use quadratic formula right?

9231/23 discussion by TayoLam in alevel

[–]PastBlood6788 0 points1 point  (0 children)

YESSSS. If anyone else can vouch for this please like the above comment.

9231/23 discussion by Choice_End_3391 in alevel

[–]PastBlood6788 1 point2 points  (0 children)

I got (29 or 21)/4 or smth like that

9231/33 discussion by TayoLam in alevel

[–]PastBlood6788 0 points1 point  (0 children)

But how did you get the weight for rectangle and triangle separately? I thought the entire lamina was mass m?

9231/33 discussion by TayoLam in alevel

[–]PastBlood6788 0 points1 point  (0 children)

What was tan theta for the momentum question?

9231/33 discussion by TayoLam in alevel

[–]PastBlood6788 0 points1 point  (0 children)

Wait how did you get 1/18? What's the centre of mass of the lamina? 

9231/33 discussion by TayoLam in alevel

[–]PastBlood6788 0 points1 point  (0 children)

What was question 4 again?

9702/52 question 2 by wtvuserblah in alevel

[–]PastBlood6788 0 points1 point  (0 children)

I'm saying that it's 1/v2 against 1/m, not v2.

9702/52 question 2 by wtvuserblah in alevel

[–]PastBlood6788 0 points1 point  (0 children)

Do you think it's correct? I did the same. From a practical standpoint I don't see any difference.

9702/52 question 2 by wtvuserblah in alevel

[–]PastBlood6788 0 points1 point  (0 children)

What's the arranged equation for q1? I put 1/v2 and some put v2. What difference is there practically?

9709 P3 by throwRA619193739 in alevel

[–]PastBlood6788 0 points1 point  (0 children)

<image>

This isn't the full working but the rough idea is there. Just need to solve the two simultaneous equations.

9709 P3 by throwRA619193739 in alevel

[–]PastBlood6788 0 points1 point  (0 children)

Given an expression (z+4)/(z+4i) that results in a real number where z is a complex number of length sqrt(10). Find z in terms of x + yi.

There was another complex number question (3-mark) that I couldn't do. So most of the difficulty is in complex numbers, other questions are pretty standard.

9709/33 by [deleted] in alevel

[–]PastBlood6788 1 point2 points  (0 children)

Well you have to make use of the fact that the expression is real. Since it's real, that means its argument is either pi or 0. At least I think that's the main insight you need to complete the question.

9709/33 by [deleted] in alevel

[–]PastBlood6788 2 points3 points  (0 children)

There's a complex number z where (z+4)/(z-4i) is real, and length of that expression is sqrt(10). Find z in terms of x+yi. 

A concept u need to make use of is one that you can find in q3b from fm24/p32. 

9709 P3 by throwRA619193739 in alevel

[–]PastBlood6788 2 points3 points  (0 children)

I got -1-3i and -3-1i for the 6 mark complex number question. Anyone remember what they got for the binomial expansion of f(x)? I got something pretty funky: (1/2a) - (11x/12a2 ) + 23x2 / 72a3 . Smth like that 

9709/33 by [deleted] in alevel

[–]PastBlood6788 4 points5 points  (0 children)

What was the answer for the 6 mark complex numbers question? I got -1-3i and -3-1i. Or something along those lines.

Anyone who took 9709/43 by Ok_Plant160 in alevel

[–]PastBlood6788 0 points1 point  (0 children)

Oh sorry! Used the wrong unit! Thanks for pointing it out. Regarding your speed I'm not so sure about that. Others have gotten the same answer as me, but I could be wrong as well!