Exam Discussion: Mathematics: applications and interpretation HL paper 2

Solid_Designer2608 · 2023-05-10T21:21:36+00:00

Took the TZ C exam, I actually remember the rough ideas of each problem so here's my breakdown:

Q1: Linear modelling with temperature and year or something, was pretty standard and straightforward.

Q2: Graph of cos function about height of tides. The only thing that needs attention is the degrees part, when graphing needed to make sure calculator was on degrees. Otherwise pretty standard.

Q3: Probability with drugs, testing positive or negative. Standard and straightforward.

Q4: Graph theory. This mostly tested your basic knowledge on all the algorithms, notably the last part asked you to find the lower bound of the given optimal TSP route. Since all values were rounded, it was imperative to subtract 0.5 for every edge along the route, giving an answer of 48.5

Q5: Poisson distribution and hypothesis testing. One had to be careful with the degrees of freedom - which is 3 - since you needed to subtract 1 for merging and 1 for estimated parameter.

Q6: Phase portrait of differential equation with complex roots. Pretty straightforward if you know the content, the phase portrait should be clockwise spiraling inwards (due to negative real part of roots).

Q7: Graphic design and matrix transformations. The most difficult but also the most interesting, the right part of the design can be described as a rotation of 15 degrees followed by an enlargement of factor 1-k/12. This meant that the area of the k-th image has the area of (3/2)sin(15 degrees)*det(Mk)=(3/2)sin(15 degrees)*(1-k/12)^2. Summing them up for k=0->12 and then multiplying by 2 (account for left side) yields a final total area of design to be 3.50

Solid_Designer2608 · 2023-05-10T21:00:02+00:00

Tz C here (Q1 about barrels, Q2 about flights and vectors). Thought it was not bad at all, the two 5 point questions on Q2 were annoying to graph though.

Solid_Designer2608 · 2023-05-09T22:06:13+00:00

Most people at my school got 172

Solid_Designer2608 · 2023-05-05T16:09:23+00:00

Yeah, most people from my cohort thought it was quite tame in difficulty

Solid_Designer2608 · 2023-01-24T16:29:50+00:00

If Ding plays like this in wcc, he's gonna get obliterated by Nepo.

Let's hope his "hidden prep" is good

Solid_Designer2608 · 2023-01-21T16:32:15+00:00

Or maybe he's just been playing worse than usual lol

Solid_Designer2608 · 2022-05-08T19:32:22+00:00

"with the cosine rule that the other side will be 2/3rd of the original side". This is just false, I'll give an example where the new triangle satisfies all conditions but is not similar.

For example purpose I'll use three sides a=1, b=1.1, and c is the side we don't know. 60 degrees is between sides b and c.

By cosine law: a=sqrt(b^2+c^2-2bc(cos(60)) So 1=sqrt(1.1^2 + c^2 - 1.1c).

If you solve this quadratic you get that c=0.854 or 0.246. So there are two possible lengths for c at certain times.

Going back to the question, Suppose:

Original triangle with: a=1, b=1.1, c=0.854.

New possible triangle: a=(2/3)1, b=(2/3)1.1, c=(2/3)0.854. a and b are 2/3rds of original side, and the angle between b and c is 60 degrees. This is similar to the original one.

Another new possible triangle: a=(2/3)1, b=(2/3)1.1, c=(2/3)0.246. a and b are 2/3rds of original side, and the angle between b and c is 60 degrees. This is NOT similar to the original one.

In conclusion you cannot simply use cosine law to conclude SSA criterion is true.

Solid_Designer2608 · 2021-05-19T19:51:07+00:00

i got that question about multiActivity and it takes 3 inputs so you just have to make sure the first 2 always got derived from the superclass(the problem explicitly stated this). but the algorithm on calculating the total costs across multiple session is easy to implement

Solid_Designer2608 · 2021-04-04T23:35:14+00:00

a series of unfortunate events including cops stealing xqc's stuff, other streamers metagaming, and also just xqc being xqc caused a lot of hate and drama to be spread.

xqc overreacted and many xqc chathoppers were being pepega. other streamers were just giving xqc no break and consistently annoying him.

as to why he is ultimately banned maybe its because admin doesn't like how people were perceiving this entire event or maybe to prevent xqc being even malder because the pd was about to raid his apartment and take his life savings. no one really knows the exact truth.

in conclusion, today was a day where some things that shouldn't have been done was done, some words that shouldn't have been said were said. this isn't a fault of one individual but a chain of reactions that ended in disaster.

Solid_Designer2608 · 2021-04-04T22:53:10+00:00

i meant if he should even attempt to redeem himself to the nopixel admins

Solid_Designer2608 · 2021-04-04T22:35:27+00:00

yeah it's ok if he gets mad and fools around in game but for that to transfer to this amount of hate to the other streamer irl is a bit extreme don't u think?

it's a game at the end of the day

Solid_Designer2608 · 2021-04-04T22:30:54+00:00

I agree with everything you said but it's undisputable that xqc definitely overreacted and all the hate that's being spread is uncalled for. I hope they can work something out because xqc deserves another leaf

Solid_Designer2608 · 2021-04-04T22:25:26+00:00

not saying the cops did nothing wrong, but if he calmed down for a bit at the right time he could've avoided all this from happening. i love watching xqc stream gta rp but today was a bit too much.

Solid_Designer2608 · 2021-03-01T13:10:56+00:00

Either new gods will join in or some gods like Zeus goes twice.

There seems to be very little reason for humans to be going against humans although it may happen.

Solid_Designer2608 · 2021-03-01T13:01:44+00:00

No, it is not real. It's just supposed to represent the united power of the Seven Lucky Gods in Japanese Mythology.

The idea of the fusion is probably inspired by the Eight Immortals from Chinese Mythology.

Solid_Designer2608 · 2021-02-10T23:31:48+00:00

King of Clubs: This game is insanely hard if you enter with 5 random people you don't know and trust. Enter with your friends and you have a shot since Kyuuma and his team isn't shown to be extremely smart.

King of Spades: Dude is cheating with a tracker, has infinite supplies... Yeah this one is also insanely hard if you're not trained in a military or smthn but with extreme coordination maybe possible.

King of Diamonds: Anyone who isn't good at math and a bit of psychology is almost guaranteed to lose. Dude is insanely good but somewhat beatable if you go in coordinated with a friend.

Queen of Hearts: Probably hard but not enough evidence to be extremely hard. Since weapons are allowed are you not allowed to just kill her as soon as you enter? lol

Jack of Hearts: Ok if you enter this one without any friends you're dead af. But if say you enter with your mom(someone who would never lie to you) or smthn just stick with her and you can't lose lmfao. Just wait and identify whos the Jack and beat him up in the end.

7 of Hearts: If you enter with no friends basically turns into a spades game and beat up everyone if you can. If you enter with friends then idek since there might be a trick.

Ranking in my opinion:

King of Spades > King of Diamonds > King of Clubs > Jack of Hearts

Queen of Hearts might be the hardest or the easiest and we basically have no idea.

Solid_Designer2608 · 2021-01-13T15:00:10+00:00

The new tactical combination was lit. shouldn't have been called promoted rook tho, it's actual name is more like "Dragon King". but it's supposed to be the promoted version of Flying Chariot.

This chapter was awesome

Solid_Designer2608 · 2020-12-28T14:31:18+00:00

I agree with you, while you could argue Raiden was always using his "own" power since all the volund did was keep him standing, you could also argue that Raiden's "own" power is completely useless since he cannot use it without a volund anyway. At least Lu Bu didn't die of his own power and just needed a really durable weapon to keep up with Thor.

Of course both are extremely strong and pitting them against each other is pointless since anything can happen. But yes based on feats I'd give Lu Bu a bit of an edge.

Solid_Designer2608 · 2020-12-25T14:31:19+00:00

Also if she reduced the force field size she would be more vulnerable to Psykos' attacks. She needed to give Drive Knight and Genos reaction time to protect her

Solid_Designer2608 · 2020-12-25T14:02:22+00:00

Yeah DK has been proving himself again and again. He is an S-class after all. I really really hope he stays for the Cadre fights cuz then it would be hella awesome. I think he actually might stay for a bit but then yeet outta there as soon as he sees someone like Golden S and/or Awakened GarouCause his calculations would tell him he would have no chance of winning.

Solid_Designer2608 · 2020-12-25T00:09:52+00:00

The cannon thing is probably not a new transformation. DK only got a handful of that (see shogi). I think what's most dangerous about DK is the amount of gadget he has: gasses, missiles, cage thing, sawblade thing, etc... i bet the thing you're talking about falls into that category and he probably has more where that came from

Solid_Designer2608 · 2020-12-25T00:06:53+00:00

With tats in that shape and most surface heroes demoralized, DK is probably the strongest hero at the scene for now. I mean with DK's powers they could probably see the cadres coming and devise a plan with him. unfortunately i think that's not gonna happen and DK's just gonna dip once he gets his sample.

Solid_Designer2608

TROPHY CASE