C3 ocr mei june 21st 2012

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Does that include coursework? I got 14/18 for that but think I got 100% in exam what UMS would that get?

No it doesn't include coursework. Though seriously, if you did get 86/90 I don't think it would be anything less than an A*.

Reply 161

themath

[QUOTE="cemead1;38257951"]

Original post by themath

Just did this quickly now so excuse the scruffy writing please!

Question 5 part 1: when t=0,
P=7-2e^-(kx0)

So P=7-2 (because anything e^0 =1) so shouldn't P be 5?

It is 5

Long term is 7

This was posted from The Student Room's iPhone/iPad App

Reply 162

cemead1

[QUOTE="themath;38258074"]

Original post by cemead1

It is 5

Long term is 7

This was posted from The Student Room's iPhone/iPad App

Oh yeah i didn't see that! My mistake :P Still got the right answer anyway :smile:

Reply 163

Jam'

Original post by SS*

Hopefully only 2 marks gone :tongue:

I wrote "let f(x)= x^3 - x and g(x)= x^3 - x".

When you add these together, s(x) is odd.

And when you multiply, p(x) is even.

I just couldnt think of an algebraic way to prove it, and seeing it didn't say that they were different odd functions, I did it this way.

By proof they were looking for a general case. If f(x)=g(x) then f(x)g(x) = f²(x) so you haven't proven much tbh and your conclusions cannot be extended to a general case; what if f(x) =/= g(x); does it still work?

Reply 164

Jam'

Original post by DylanLJG

No it doesn't include coursework. Though seriously, if you did get 86/90 I don't think it would be anything less than an A*.

Thanks ... But probably not 100UMS?

Reply 165

Tedfoo25

Original post by Jam'

Thanks ... But probably not 100UMS?

I would say that a 68 in the written paper and 17 in the Coursework would be full marks, so 85/90 for full marks, which is still - on average - a very harsh mark.

Reply 166

Polioz

Im an idiot, i did the implicit differentiation correctly but when putting in my values in the calculator I didnt do it properly so my gradient came out at 1/2 . How many marks was that question out of and how many would I lose ?

Reply 167

ralph243

Original post by NoFunnyBusiness

It doesn't matter now, but in my book it says x not 1...and x is the right one.

That's odd; I have two text books, I just checked them and one has x printed and one has 1 printed. Obviously a mistake somewhere then
Hope the exam went well anyway (:

Reply 168

Harry.Messenger

Thought it was ok, except I got confused on q1... :L
And then had to times by 4 randomly in a question.
But it was all good :-)

Reply 169

sophie_94

Original post by Polioz

From what i can remember i think i got 1/2 as well, cant remember for sure, but i know i got 1/2 for a gradient somewhere, so we may be right! :biggrin:

Reply 170

najd5

Original post by helpme12345

you'll probably get the mark for your values but not for the answer, it can't be greater than 3/2 and less than -5/2

You can, if you try any value between the ones -5/3>x>3/2 the modulus function doesn't work. The way other people have written it, like x<-5/3 and x>3/2 means the same thing. what my inequality says is that x can be less than -5/3 so more negative values, or more than 3/2, more possitive values.

(edited 11 years ago)

Reply 171

fayola1337

Original post by myfriendSQRT(-1)

Sorry I was a bit unclear :tongue:

what I meant was that as it was the translation of the graph 1unit to the right, your limits needed to each be increased by 1 to give the equivalent area of f(x).
I think it was probably worth 2/3 marks max so don't worry :smile:

I know it was a translation, but somehow I got the original limits as -1 and 0 so the translated ones as 0 and 1. :-/ oh well.

Reply 172

verello12

Exam was easy as pie..someone post the exam paper please

Reply 173

myfriendSQRT(-1)

Original post by verello12

Exam was easy as pie..someone post the exam paper please

Easy as 3.14169265...? :wink:

I'm so sorry :frown:

Reply 174

ray_charlene

BTW, what did you guys get for the coursework?
I got 16/18, made me feel a bit relieved after C4 exam because I left a few answers in section B blank, the coursework might not be helping too much but better than nothing.

Reply 175

Jam'

Original post by ray_charlene

I wasn't bothered when we did it lol and got 14/18 ... But predicted A* by some miracle ^^ congrats on the 16

Reply 176

helpme12345

Original post by najd5

the inequality doesn't make sense, it's impossible for a number to be greater than 3/2 and less than -2/5

Reply 177

a.ayman

for the range question i saw someone wrote f(x) was between 0 and 1 but i just put f(x) was less than or equal to 1. Is this wrong?

Reply 178

sophie_94

Original post by hprmc

i got 1.5 but i dont think its right :frown:

otheer people got ln2 something :/

i got 1.5 for the area under the curve, but i think that you then had to take this area away from the area under the tangent which led me to get yeah ln2 something.

Sorry if this isnt the queston you're talking about! :biggrin:

Reply 179

sophie_94

Original post by Tedfoo25

No, sadly, as it was 0 and 1 for f(x-1), remember?
Therefore, you add 1 to each - for f(x) - to get 1 and 2, so the answer was ln(16)-1/2, which is the same as 4ln(2)-1/2, which is what most people got.