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OCR C1 Mark Scheme 16/05/12 (NOT MEI)

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Reply 40

KoalaKim

Unofficial mark scheme @

http://www.thestudentroom.co.uk/showthread.php?t=2002389&p=37573319

Reply 41

jameslad

7/5<x<24/5 IS WHAT I Got for part nine ii

Reply 42

Namige

Wasn't a bad paper but definitely harder than average

Reply 43

Venomilys

Original post by benex381

would i lose a mark for having it as -4x + 6y + 29?

No you dumb ass. if the answer was 4, would I lose a mark for writing -(-2^2)?

apply some common sense.

Reply 44

Oliver94

Original post by As_Dust_Dances_

The total perimeter was 10y+3 and it had to be between 20 and 54 right?
so 20<10y+3<54
17<10y<51
1.7<y<5.1

No the total perimeter was 10y+6 as there was an extra 3 which you'd forgotten on the right hand side of the shape.
so 20<10y+6<54
so 14<10y<48
so 1.4<y<4.8

Reply 45

PhysicsMan

Original post by jameslad

7/5<x<24/5 IS WHAT I Got for part nine ii

Correct.

Reply 46

benex381

Original post by Ilyas

No you dumb ass. if the answer was 4, would I lose a mark for writing -(-2^2)?

apply some common sense.

You're a ****, exclaiming about getting 100 percent

Reply 47

PhysicsMan

Original post by Ilyas

No you dumb ass. if the answer was 4, would I lose a mark for writing -(-2^2)?

Yes, you would lose marks because -(-2^2) = -4 not 4.

Reply 48

Venomilys

Original post by PhysicsMan

Yes, you would lose marks because -(-2^2) = -4 not 4.

Oh dear oh dear oh dear.

Reply 49

As_Dust_Dances_

For the midpoint question, did people get (10/3, -2)?

Reply 50

benex381

Original post by As_Dust_Dances_

For the midpoint question, did people get (10/3, -2)?

i did, got x co-ordinate as 6 and 2/3 so midpoint must be 10/3

Reply 51

icy elemental

Original post by Ilyas

Oh dear oh dear oh dear.

The way you wrote it is unclear... -(-2^2) seems to be -4... had you put -(-(2^2) then you would have been clearer. As it is you appear to be squaring -2 to get 4, and then must apply the - outside the brackets.

(edited 11 years ago)

Reply 52

PhysicsMan

Original post by Ilyas

Oh dear oh dear oh dear.

Yes, that is an appropriate response to your mistake- if you are going to try to call somebody a dumbass, then at least get your own calculations correct.

Reply 53

icy elemental

Technically using BIDMAS he is correct, though he wrote it down in a very unclear way. The power on the 2 would square it prior to its - sign being taken into account, so you'd basically have -(-4), which would be correct. However, it wasn't clear at all what he was saying.

Reply 54

Venomilys

Original post by PhysicsMan

Yes, you would lose marks because -(-2^2) = -4 not 4.

Original post by icy elemental

The way you wrote it is incorrect... -(-2^2) is -4... had you put -(-(2^2) then you would have been correct. As it is you are squaring -2 to get 4, and then must apply the - outside the brackets.

Oh dear oh dear oh dear oh dear.

The only way I could possibly be wrong is if I wrote: -((-2)^2).

But what I wrote is -(-2^2) which basically says -(-1x2^2).

For two people to get this wrong in a row... it's highly unusual I must tell you. I suppose you two will be retaking C1?

Reply 55

PhysicsMan

Original post by Ilyas

Basic mathematics is evidently not your fortè, minus 2 squared is? Yes, that's right it's 4: squaring a minus number gives you a positive number.

Thus, -(-2^2) = -(4) = -4

Quod Erat Demonstrandum.

Reply 56

icy elemental

Nice to know it took you some 7 minutes to come up with such a witty response after I changed my post :smile:

Anyway, I'm sure you can undoubtedly see what we're both saying even though we both know what you meant, so essentially you're just trying to be annoying and cocky.

And no, if the unofficial mark scheme's anything to go by I have 100%.

Reply 57

BabyMaths

Original post by PhysicsMan

Basic mathematics is evidently not your fortè, minus 2 squared is? Yes, that's right it's 4: squaring a minus number gives you a positive number.

Thus, -(-2^2) = -(4) = -4

Quod Erat Demonstrandum.

Sadly -2^2=-(2^2)=-4.

But why wouldn't he just write 4 if that was the answer?