# Mathematics: Post your doubts here!

#### Ebrahim12

Yeah how was it? Fine paper but not enough time. Still did well enough to get an A* - best case scenario would be 71, worst case scenario would be 68 so I'll lose 5-6 marks I'm guessing.
Forgot about the constant in differential equation so one mark lost there, didn't attempt the expand sin(3x+x) and sin(3x-x) part at all as I ran out of time. So losing 4 marks and I could lose 3 more potentially for method marks in AB=2rcosx proof and differential equation part(ii) which was one mark(differential equation question was a repeat from march 2016 question 7 and the mark scheme only says 'justify statement' for part ii which is very vague).

Overall, everyone had problem with timing so threshold would be about 57-59 for an A in p3 and A* in maths will be about 228-230.
Yeah time was tight for me too
Don't know/think I did anything wrong and I just need to lose less than 8 marks for a star even with high grade boundaries

Hate it when they pull the vague answers in the ms, why even bother at that point

#### PhantomFlash

Spaced out mid exam.
Couldn't finish in time.
Would've landed an A if I had better concentration.

Can anyone type in the answers if you remember them?

#### hellodjfos;s'ff

Spaced out mid exam.
Couldn't finish in time.
Would've landed an A if I had better concentration.

Can anyone type in the answers if you remember them?
I am so exhausted that I remember very few answers. Usually I'll remember all the answers but this exam has drained the life out of me.
1. Coefficient was 6 maybe(don't remember properly)
2. Log question: x=0.126 - don't remember properly
5. Complex number roots question: k=2
7. Refer for m16 paper for answer, answer is complicated and c=0 - differential equation
Plane question: Equation of plane M was 4x-2y-4z=5(signs maybe off as i don't recall this one properly)
Shaded region= 9/16, value of stationary point's x-coordinate=1.3
Iteration was the easiest of the last few questions so don't remember it at all.

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#### A*****

I am so exhausted that I remember very few answers. Usually I'll remember all the answers but this exam has drained the life out of me.
1. Coefficient was 6 maybe(don't remember properly)
2. Log question: x=0.126 - don't remember properly
5. Complex number roots question: k=2
7. Refer for m16 paper for answer, answer is complicated and c=0 - differential equation
Plane question: Equation of plane M was 4x-2y-4z=5(signs maybe off as i don't recall this one properly)
Shaded region= 9/16, value of stationary point's x-coordinate=0.13
Iteration was the easiest of the last few questions so don't remember it at all.
X coordinate in the last part wasn't this, it was greater then 1...the diagram clearly showed that it had to be between π/3 (the upper boumdary calculated for area in the previous part ) and π/2

#### hellodjfos;s'ff

X coordinate in the last part wasn't this, it was greater then 1...the diagram clearly showed that it had to be between π/3 (the upper boumdary calculated for area in the previous part ) and π/2
Thank you for refreshing my memory. Yes it was 1.3(i mean that's what I got).

I got 1.2 something, it said write down your answer to 2 decimal places

#### hellodjfos;s'ff

I got 1.2 something, it said write down your answer to 2 decimal places
Yeah yeah I remember, I wrote 1.30.

#### BQRS01

Yeah how was it? Fine paper but not enough time. Still did well enough to get an A* - best case scenario would be 71, worst case scenario would be 68 so I'll lose 5-6 marks I'm guessing.
Forgot about the constant in differential equation so one mark lost there, didn't attempt the expand sin(3x+x) and sin(3x-x) part at all as I ran out of time. So losing 4 marks and I could lose 3 more potentially for method marks in AB=2rcosx proof and differential equation part(ii) which was one mark(differential equation question was a repeat from march 2016 question 7 and the mark scheme only says 'justify statement' for part ii which is very vague).

Overall, everyone had problem with timing so threshold would be about 57-59 for an A in p3 and A* in maths will be about 228-230.
Grade boundaries for A* might be lower like 225-227 because of Paper 12 as well. What do you think?

#### hellodjfos;s'ff

Grade boundaries for A* might be lower like 225-227 because of Paper 12 as well. What do you think?
Unlikely that they will go below 227 for those that gave AS and A2 separately and not below 229 for those that gave AS and A2 together.

#### BQRS01

Unlikely that they will go below 227 for those that gave AS and A2 separately and not below 229 for those that gave AS and A2 together.
In that case let’s hope for a 227 Grade boundary for those that did AS and A2 separately. Fingers crossed...

#### FarGang

Any idea regarding the grade boundary for A? I did AS and A level separately?

#### ThePacifics

FREE HELP PROVIDED
Hi sorry to be a bother but if anybody needs help with any physics or maths topic im giving free help be it past paper questions or conceptual. Just email me on [email protected] and i'll reply asap good luck for exams yall

#### Thought blocker

Greetings to all members,

As we were getting a lot of requests to start our YouTube channel, our academy is finally planning to start one related to A level maths for now. I request you all to feel up the form linked below which will really help us know the actual need of a YouTube channel. Feel free to suggest us ideas on videos you will like to see on our channel (It cannot include videos of chapters or topics, it should be something new which is not readily available to all of A level students).

Please share this as much as you can to everyone who is about to appear or preparing for AL mathematics (Any boards are allowed like CAIE, IB, Edexcel, Zimsec, AQA and many more). We will start our channel right away if we got the response of at least 100 students.

Thank You.

Best wishes,

#### bibliophile

Can anyone help me solve this mechanics problem?
A lion is watching a zebra from 35 m behind it. Both are stationary. The lion then chasing by accelerating at a constant rate of 3 m s⁻² for 5 s. Once at top speed the lion decelerates at 0.5 m s⁻². The zebra starts moving 1 s after the lion started, accelerating at a constant rate of 2 m s⁻² for 7 s before maintaining a constant speed.
Show that the gap between them at time t s, for t > 8, after the start of the lion's motion is given by 0.25t² - 5t + 25.5

#### Shemyaa

Greetings to all members,

As we were getting a lot of requests to start our YouTube channel, our academy is finally planning to start one related to A level maths for now. I request you all to feel up the form linked below which will really help us know the actual need of a YouTube channel. Feel free to suggest us ideas on videos you will like to see on our channel (It cannot include videos of chapters or topics, it should be something new which is not readily available to all of A level students).

Please share this as much as you can to everyone who is about to appear or preparing for AL mathematics (Any boards are allowed like CAIE, IB, Edexcel, Zimsec, AQA and many more). We will start our channel right away if we got the response of at least 100 students.

Thank You.

Best wishes,
I suggest solving pastpaper questions maybe? We don't get the explanation of the answers always,
especially things like stats and mechanics.

#### Thought blocker

Sure
I suggest solving pastpaper questions maybe? We don't get the explanation of the answers always,
especially things like stats and mechanics.

#### Shubham dorah

Hello can you plz figure out why a gradient of a curve is never negative ?

#### Shubham dorah

can you figure out why the gradient of a curve is never negative ?

#### PlanetMaster

can you figure out why the gradient of a curve is never negative ?
Can you please provide the question?

Generally, if a question is asking why the gradient of a curve is never negative, you need to find the derivative of y (gradient) and you'll get an equation which can never be negative for e.g.:
$$(3x-2)^2,\text{ which is always}>0$$

#### KashishV

STATISTICS HELP NEEDED
I got the first two parts but I am so confused about solving (iii). Can anyone help me out by providing a good explanation so that I can, too, develop that way of thinking.

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