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# Arsey's S15 C1 Model Answers (attached to 1st post) watch

1. (Original post by particlestudent)
He got the same inequalities as me but he wrote them separately. I'm asking you why we had to write them separately?
Even i got same ineq. But from graph see the shaded region its not together but seperate so had to write it seperately.

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2. (Original post by Krollo)
You mean you used d=0?
There's nothing wrong with that at all, and I'm sure you'd get the marks if you got 80

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yes, thats what I mean. I just thought it might be a "silly" method.
3. (Original post by usmanzubair)
Even i got same ineq. But from graph see the shaded region its not together but seperate so had to write it seperately.

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Oh crap.

I guess that's an answer mark gone.
4. (Original post by usmanzubair)
70/75 happy
MashaAllah

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I got the same, hopefully it will be over 90% and then I'll only need a B in stats haha-Stat's is the worst module out of m1,C2,C1,d1,d2 and fp1
5. (Original post by Arsey)
Here are my solutions.

I didn't think it was an 'easy' paper, quite a few questions with tricky parts.

Expect average(ish) boundaries.
Could I have done x=log(base2)(1/8)?
And do you think these boundaries will be higher/lower than last year?

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6. (Original post by Mutleybm1996)
Could I have done x=log(base2)(1/8)?
And do you think these boundaries will be higher/lower than last year?

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Yes. Nothing wrong with that.

Grade boundaries will probably be a bit lower.

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7. On Q7b, how many marks would one lose for not doing anything after finding the two values for y?
8. (Original post by particlestudent)
Oh crap.

I guess that's an answer mark gone.
Same here

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9. (Original post by Jack Xerxes)
On Q7b, how many marks would one lose for not doing anything after finding the two values for y?
Probably two.

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10. Check assisttutor.com for unofficial mark scheme

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11. (Original post by Krollo)
Yes. Nothing wrong with that.

Grade boundaries will probably be a bit lower.

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whats you predictions?
60 - A
54 - B are mine
yours?
12. (Original post by naxiv)
whats you predictions?
60 - A
54 - B are mine
yours?
Marginally higher. I'm saying 61-62 for an A. You look about right with the B though imo.

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13. (Original post by usmanzubair)
Same here

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Hopefully 74/75 is 100UMS
14. Wouldn't it be k=12 if n=11
15. (Original post by particlestudent)
I don't understand, my inequalities are exactly the same as Arsey's just together.

3-2sqrt2>p>3+2sqrt2

Isn't that the same as p<3-2sqrt2 and p>3+2sqrt2????
I tried to draw it to kinda explain. Don't worry you probably lost a mark at most.
16. (Original post by NotNotBatman)
Same, I'm really disappointed since I accidentally missed one of the questions (lost 4 marks) and made silly mistakes that I wouldn't normally make.
exactly
17. DAM for the factorising question i multiplied by - to get a positive 4xsquared, to make it easer to factorise and then used all those values for drawing the graphs!!!! HOW MANY MARKS WILL I LOSE!?!?!?!?
18. (Original post by Krollo)
Marginally higher. I'm saying 61-62 for an A. You look about right with the B though imo.

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The way i think i got 61 or 62....
19. In Q6 in the differentiation, I wrote the first term as 2x^3/x then said it is 2x^-3 instead of 1/2x^-3... This led to me doing all of the 10 mark question wrong due to this one little mistake. Will I lose many marks? Will I get follow through marks if my method is right? ((
20. (Original post by Yousf)
DAM for the factorising question i multiplied by - to get a positive 4xsquared, to make it easer to factorise and then used all those values for drawing the graphs!!!! HOW MANY MARKS WILL I LOSE!?!?!?!?
I use to do that a lot but then i realised it has to be equal to something for that to work :/ you'll get all the marks up until that error

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