Answers that I have. I might have copied some wrong so be wary of that
1) 3
2B) 0.236
3A) A = 10 N - 3
B) X < -1
4A) (1/2) + (1/16)x + (3/256)x^2
4Bi) -14 ii) (-1,2)
5A ) 2(x+1)^2 + 7
5C) Moves by (2, -3) ii) Range Y<=3
6A) 18.4, -18.4, 161.57, -161.57 but to 1dp
6B) 6.6
7A) 20000(0.8)^t
7B) 2147.5 which is close to 2000 so accurate to 10%
11C) 165 minutes 57 seconds. I did 24 + 20000(0.8)^t 16 times. I'll work it out on excel to make sure what the answer was.
12B) 3.18
13C) A = -1 B = 9/10. I think A is wrong, if someone can give me the question I'll work it out
14A) 1/8
14B) Y = x / 8 so the line was a tangent to the curve at (0,0)

Reply 985

Dr.Straw

7

I’m going to jump the gun right now and say
A* =85
A=65
B=50

Original post by JordanStewart

Grade boundary predictions for this paper:
A*=88
A= 70
B=58

Reply 986

YellowYellow2

16

Original post by solark

Its correct

Oh cool, spent too long on it

Reply 987

Heidi-Heather

12

I think I got 3.something for this too.

Original post by _gcx

The one with |10e^(-0.25x) sin(x)|. You wanted the second maxima wihch was

\pi + \arctan 4

, giving a maximum height of about 3.175m? Can't quite remember the numbers.

Do you want to set this up in a new thread so that people can see the answers a little easier? Please let me know adn we can set up an unofficial markscheme and promote it for you guys!

Original post by UrBusted

Answers that I have. I might have copied some wrong so be wary of that
1) 3
2B) 0.236
3A) A = 10 N - 3
B) X < -1
4A) (1/2) + (1/16)x + (3/256)x^2
4Bi) -14 ii) (-1,2)
5A ) 2(x+1)^2 + 7
5C) Moves by (2, -3) ii) Range Y<=3
6A) 18.4, -18.4, 161.57, -161.57 but to 1dp
6B) 6.6
7A) 20000(0.8)^t
7B) 2147.5 which is close to 2000 so accurate to 10%
11C) 165 minutes 57 seconds. I did 24 + 20000(0.8)^t 16 times. I'll work it out on excel to make sure what the answer was.
12B) 3.18
13C) A = -1 B = 9/10. I think A is wrong, if someone can give me the question I'll work it out
14A) 1/8
14B) Y = x / 8 so the line was a tangent to the curve at (0,0)

Reply 989

robthedon42

2

model question i did: V = 20000xr^t
16000 = 20000r^1
r=0.8

= V=20000x0.8^t

- model is reliable as 20000x0.8^10 = 2147 which is close to the true value

- for car B keep the model the same apart from increase the value of 0.8 to something like 0.9 for a slower decrease.

running question:

first 6km = 6+6+6+6+(6x1.05)+((6x1.05)x1.05)
= 36 mins 55 secs

time for total = 24 mins (first 4 km) + 6(1-1.05^16)/-0.05
= 24 mins + 141.9445 mins
= 165 mins + 0.9445 x 60 seconds
= 165 mins and 57 seconds

Reply 990

lijuli

12

can someone post the working out to the integration question :/

Reply 991

haleemam

7

ohhhh lmao im dumb, thank you though

Original post by Lucallah

9/5 and -12/5 were partial fractions, -24/5 and 33/10 were the answers to ln coefficients

Reply 992

JosephCiderBwoy

16

Well that was... interesting

Reply 993

Nath Cu11er

6

Out of all 3 a B was 155, which is just under 52 per paper and C was 126/300 so 42 per paper. If I get EVERYTHING I did right (which I wont), I'll have just have a C, based on Last years boundaries obvs. They would have to bring it down. I mean ffs, a guy in my school got an offer from Camebridge and 1) Found it quite difficult and 2) Didnt finish the last question. If that doesnt tell you they need to be lowered, I dont know what will

Original post by student 0_0

What were last year's grade boundaries?

(edited 4 years ago)

Reply 994

Ahhshsnsn

8

Lmao are you mad. It was 77% last year and this years paper was so much harder. Stop chatting

Original post by JordanStewart

Grade boundary predictions for this paper:
A*=88
A= 70
B=58

Reply 995

i-hate-examsss

4

I got that too!

Original post by Toli123

i got 159 and 55 sec

Reply 996

slily

7

What the hell was that exam? :frown:

Reply 997

strachanso

6

Can guarantee is wont be this high

Original post by JordanStewart

Grade boundary predictions for this paper:
A*=88
A= 70
B=58

Reply 998

Dr.Straw

7

I set I set it all up and got the range then went to integrate is and yea just didn’t have the time will still get like 2 marks though hopefully

Original post by 4572dk

feel the exact same way man. Found A and B but didn't integrate. Did whatever working I could for the last 2. Im not sure what to feel because I found it ok just couldn't finish.