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C2 unofficial answers

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Reply 160
Avatar for civ1
civ1
2
Original post by AstarAstarA
Geometric:
b) 256
c) 1.602

Binomial:
A = 16
k = 7/2
B = 936

Integration:
S = 24.3

Trapezium:
a) 7
b) 20.75
c) R = 5.75

Factor theorem:
a) 5
c) (x + 2)(3x + 2)(2x - 1)

Differentiation(Q10):
a) 1/3PIx^2
d) Minimum = 120m
c) x = 16.63... => f''(x) = 0.437 > 0

Trig identities:
a) Theta = 8/15Pi , -2/15Pi
b) x = 194.5, 345.5

Circle:
a) root(34)
c) 3x + 5x - 95 = 0

Log:
i) (a - 5)/9
ii) -2.19

Likely UMS:

68 - A
57 - B
49 - C
41 - D
36 - E
U


these grade boundaries are way to high
Reply 161
Avatar for imran_
imran_
2
Original post by civ1
these grade boundaries are way to high


for an A id say 62-64
Reply 162
Avatar for civ1
civ1
2
Original post by imran_
for an A id say 62-64


yeah about right for 90 ums about 71
How many marks was the first logs question?
how many marks was question 8b, anyone remember ???? the log qustions
Can anyone explain how its 120 for the minimum value of P? I got x to be 16.7 or something close and then put that back in to the original equation to get 65m
EDIT- i think i know now, i divided the coefficient of x by 12 twice.
(edited 7 years ago)
Original post by Accountantlolks
Would I loose any marks for not putting it in radians..??


This question had no answers in radians
Original post by AstarAstarA
This question had no answers in radians


No the last question , number one i area of the sector i put 120x instead of radians? thanks
Original post by richpanda
i got -2.19.

anyone get 9b+5 for a in terms of b?


it asked for b in terms of a. it was: b=a/9-5/9
Original post by isaac_wood_
Can anyone explain how its 120 for the minimum value of P? I got x to be 16.7 or something close and then put that back in to the original equation to get 65m


yeah, you'll only have dropped one mark for that, just put it in wrong possibly
Original post by isaac_wood_
Can anyone explain how its 120 for the minimum value of P? I got x to be 16.7 or something close and then put that back in to the original equation to get 65m


If you put 16.633... Back into the equation you got 120.something
Reply 171
Avatar for oinkk
oinkk
3
Original post by Jkylhyd
You had to do 1944-1008 or -1008+1944 to get B as 936.


Could've sworn there wasn't any other x^2 terms. That 1944 rings a bell though. Oh well!
when you recognise that for the tangent question you did 10-7=2 :angry::frown::colonhash:
Original post by AstarAstarA
Geometric:
b) 256
c) 1.602

Binomial:
A = 16
k = 7/2
B = 936

Integration:
S = 24.3

Trapezium:
a) 7
b) 20.75
c) R = 5.75

Factor theorem:
a) 5
c) (x + 2)(3x + 2)(2x - 1)

Differentiation(Q10):
a) 1/3PIx^2
d) Minimum = 120m
c) x = 16.63... => f''(x) = 0.437 > 0

Trig identities:
a) Theta = 8/15Pi , -2/15Pi
b) x = 194.5, 345.5

Circle:
a) root(34)
c) 3x + 5x - 95 = 0

Log:
i) (a - 5)/9
ii) -2.19

Likely UMS:

68 - A
57 - B
49 - C
41 - D
36 - E
U


The UMS is scaring me.
Original post by Accountantlolks
No the last question , number one i area of the sector i put 120x instead of radians? thanks


1/2(x^2)(120) is wrong because the area of a sector equations only work with radians. I think you have lost BOTH marks if you wrote JUST that. If you had stated the general formula and theta then you may get M1 but we're just speculating
Original post by AstarAstarA
1/2(x^2)(120) is wrong because the area of a sector equations only work with radians. I think you have lost BOTH marks if you wrote JUST that. If you had stated the general formula and theta then you may get M1 but we're just speculating


well thanjks
Original post by oinkk
Could've sworn there wasn't any other x^2 terms. That 1944 rings a bell though. Oh well!


If you multiply (1 + kx) by the x term you get another x^2 term!
Original post by FakeDumbledore
Unlucky mate I've seen the official mark scheme and a few of these are wrong :/
Better luck next year in your resit...


Does anyone have the official mark scheme?
Original post by Isabellagoodwinx
Does anyone have the official mark scheme?


The official mark scheme doesn't get released for over a year
Original post by AstarAstarA
The official mark scheme doesn't get released for over a year


That's weird because I got the c1 mark scheme the day of the exam, I don't mean the actual mark scheme I mean one a teacher has done

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