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# Edexcel C4 June 2016 - Unofficial Markscheme

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1. (Original post by NotNotBatman)
For the volume on 7b I got something like
'Twas 544pi - 1024(pi)/5 = 1696(pi)/5
2. (Original post by NotNotBatman)
For the volume on 7b I got something like
I got same as you.
3. Hi guys i really need some help with this, i'm panicing so hard..

for question 4 i accidently put the x on the top instead of the bottom so differentiated and got -x^2 / 5 = t + c

then everything else i did was from this. So i think i got both of the questions wrong. My methodology was correct but i got the wrong equation because I made this silly error.

I ended up getting 640 as t and did 640x24x60 to get the minutes

How many marks would i lose for this? Would i get any marks carried forward?

for the very last vector question i used 1/2absinC to get the area but used 1/2(2route5)(2route5)(3/5) instead of using 2route2 so i got 6 instead of 12/5 for the area.

For the very last section I used P +/- linda(direction vector of l2) to work out the two points of B but worked out linda as 1 which is wrong.

How many marks in total would i lose for these errors? Any help would be very appreciated!
4. was the parametric x = 4 tant and y = 5root(3)sin2t
5. Anyone know how many marks would be lost for misreading the volume question as an area? I'm thinking all 4 lost.
6. I differentiated -cos (piy) wrong , didnt take the pi out. If my whole dy/dx is correct expect im missing the pi how much marks should i lose ... it was a 6 marks question i guess
7. (Original post by Don Pedro K.)
'Twas 544pi - 1024(pi)/5 = 1696(pi)/5
The 544 looks right, I can't remember the fraction though, what was the curve equation?
8. Wasn't the area of the whole rectangle thing 512 pi?
9. (Original post by edothero)
Let E be a general point on the line

So

Find PE:

So

Now we know that

Therefore the lengths are the same, as the length of

You know that

Then use this lambda with the general point equation
Lol, lost all 5 marks on that question...shame
Also for the value of lambda that I obtained was 32, I know this is wrong know but everything else I got was correct.
Do you think the error will be carried forward to the next question.
10. (Original post by Aruba852)
I differentiated -cos (piy) wrong , didnt take the pi out. If my whole dy/dx is correct expect im missing the pi how much marks should i lose ... it was a 6 marks question i guess
It was 5 marks for the dy/dx and 4 marks for the coordinates. I also got the dy/dx wrong but I reckon we will definitely get some method marks!
11. (Original post by NotNotBatman)
The 544 looks right, I can't remember the fraction though, what was the curve equation?
Y = (2x-1)^(3/4) I believe?
13. (Original post by coolguy123456)
Wasn't the area of the whole rectangle thing 512 pi?
We wanted volume not area
14. OH GOD YES! After doing misreably in C3, I made up for it in c4!!!! 71-73/75. FEELSGOODMAN
15. Any idea how many marks 6. b), c), d), & 8. a) were worth?
16. Hi guys
On Q3 I forgot the minus 2 and got an answer of 6/22+π instead of 8/22+π. This lead to my next part being wrong also. Bow many marks do you think I'll loose. All of them?

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17. (Original post by edothero)
Spoiler:
Show
Let E be a general point on the line

So

Find PE:

So

Now we know that

Therefore the lengths are the same, as the length of

You know that

Then use this lambda with the general point equation
Interesting.

I wrote because mod l2's direction = 5sqrt2 and we want lengths of +-2sqrt2, then we must multiply the line equation direction by factors of +-2/5
18. (Original post by MrPooey)
Anyone know how many marks would be lost for misreading the volume question as an area? I'm thinking all 4 lost.
I did thr same mistake lol. I even had to integrate that function again. Hope i read it right that time altho pretty sure area is correct. I think we can get 2 if area is correct :/

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19. For 7b, I rushed the last part and wrote 1024pi(/5) -544pi instead of 544pi -1024pi/5 :/

How many marks lost on this?
20. how many marks was question 3 and the last part of 7 worth?

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