Intermediate 2 Maths 2010 Thread Watch

Quintro
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#41
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#41
Here is paper 2, I'm sorry but I never lifted paper one I'm afraid ...

[Page 1]
[Page 2]
[Page 3]
[Page 4]
[Page 5]
[Page 6]

These photos were took with my phone and edited so you can read them as my scanner is at my other house.
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minsyb
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#42
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#42
Here are my answers (I know some of them are wrong!!)

Paper 1

1. Y=-4/3 +8
2. b) 7, 6 and 8
3. 37.68cm3 (Total nonsense I know!!!!)
4. a) (x-2) (x+3)
b) 3x3 + 17x2 + 7x - 2
5. -9
6. Can't remember but think I said something like 4cm!!
7. p(-18)
8a) -11
b) Can't find the roots of a minus number
9. 45 degrees
10. a) -5
b) 8,0
c) -20

Paper 2

1. £155,000
2. Pasta - 150 degrees Baked potato 200 degrees Salad - 10 degrees
3. £8
4. a) 49
b) 3.96
5. Y = -12.32 and X = -18.8
6. 3s/2
7. L=p/2 - B
8. 6 square root 2
9. 1342.56 cm2
10. b) 2
11. 25.3cm
12. 126.48m
13. 3.45m
14. a) 8.69
b) 48 degrees
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Danny1994
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#43
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#43
Q6 =
1/2 *12 = 2 cm
1/3
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Lscott22
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#44
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@minsyb

Paper 2

Q3. I got £11
Q4. (a) I got 7

Some others I can't remember.
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Danny1994
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#45
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@Lscott22
That is the same as i got
Q14b) i got 48 degrees and 228 degrees because it was tan and you used x and 180+x
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Lscott22
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#46
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#46
@Danny1994

I got thoose answers as well, but I got 228 degrees and I did not put it down because that would mean the building was hanging/bending over the surveyor?
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Danny1994
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#47
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Paper 1
1) y=-4/3x+8
2) Got it wrong
3)113.04cm^3
4)(x-2)(x+3)
4b)3x^3+17x^2+7x-2
5)Missed out
6) I wrote 2 down at first but it didnt look right so i put 4 :P
7)p^9
8)-11
8b) Cannot find the roots of a negative number
9)45 degrees
10)-5
10b)(8,0)
10c)5

Paper 2

1)Got completly wrong
2)Pasta-150 Baked potato-200 salad-10
3)£11
4)Mean=7 s.d = 3.96
4b)the s.d is more spread out and the mean is <27
5)x=7 y=7.6 y is wrong i know
6)3t
8)4 root 7
9)1342.36 cm
11)25.33
12)67.44 m
13)3.45
14)8.7
14b) 48.17 and 228.17
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CJN
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#48
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Solutions:

1) 0.9575 * 0.9575 * 0.9575 * 176500 = £155000

2)

Pasta - 150 deg
Potato - 200 deg
Salad - 10 deg

3) p = 2 + 1.5m = 2 + 1.5*6 = £11

4) a) i) 7
ii) 3.958

b) SD is lower so less spread with the new coach. Mean is higher so better score.

8)

2x - 5y = 24
7x + 8y = 33

14x - 35y = 168
14x + 16y = 66

14x - 14x - 35y - 16y =168 - 66
-51y = 102
y = -2

2x - 5y = 24
2x + 10 = 24
2x = 14
x = 7

So x=7 and y =-2

6)

(s^2)*3t / t*2s

= 3s / 2

7)

P = 2(L+B)

P/2 = L+B

L = P/2 - B

8) sqrt(63) + sqrt(28) - sqrt(7) = 5 root 7 - root 7 = 4 root 7

9) Front and back:

Area = pi*r^2 = pi*14^2 = 615.75 for whole area.

65 deg. 65 / 360 = 18.06% of the area.

So front is 0.1806 * 615.75 = 111.18 cm^2 * 2 (for back) 222.36 cm^2

Sides:

Recentangle sides 14 and 40 so for two = 14 * 40 * 2 = 1120 cm^2

Answer = 1120 + 222.36 = 1342.36 cm^2

10)

a) A = (x+3)(x+7) = x^2 +3x +7x +21 = x^2 + 10x + 21

b) x^2 + 10x + 21 = 45
x^2 + 10x - 24 = 0

(x-2)(x+12) = 0

x-2 = 0 -> x = 2
x+12 = 0 -> x=-12

x can't be -12 or sides would have a negative length, so x=2

11) A of top = pi*r^2 = 128.7 cm^2

V = AL

L = V/A = 3260 / 128.7 = 25.3 cm

12) Angle SRQ = 180 - 90 - 42 = 48 deg
Angle PRS = 63 deg
So Angle PRQ = 111 deg

Side RQ = (350 / sin111)*sin27 = 170 m

Side SQ = (170/sin90)*sin48 = 126m

126m

13) Heigh below =

1.95^2 - 1.25^2 = 2.24

sqrt(2.24) = 1.5

1.5 + 1.95 = 3.45 m

14) a)15*tan25 + 1.7 = 6.99 + 1.7 = 8.7m

b) tanx = (h - 1.7)/15 = (18.4 - 1.7)/15 = 16.7/15 = 1.11
x = arctan(1.11) = 48 deg
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mad-s
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#49
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#49
I thought paper 1 was easy then I BOMBED paper 2 so badly and I don't know why when I think about it now it was easy. I got a B for my prelim and an A for my extended unit test so heres hoping im O.K. for paper 2 i've counted 27 guaranteed marks and i'm needing 3 for using formulas so can someone tell me if I got the marks for these.

For 4(b) I wrote: The coach got earned more points in less games

For 9 I didn't get the full thing but I did use the formula at first and get an answer: I used the A of S/ A of C formula then got an answer and timesed it by 2 cause theres 2 sides

For 14 I got the answer wrong again but for (a) I wrote out h= 15*tan25 + 1.7 and for (b) 18.6 = 15*tanX + 1.7

are any of these worth anything? cause im DESPERATE to pick up marks I dont know why I didnt just to 12 and 14 right cause I know how to I literally had a bad day, im terrified :eek3:
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mad-s
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#50
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also does it matter if I get say a C in paper 2 and an A in paper 1 as long as both marks out of 80 add up to 60% then I have achieved a B? and could I get into higher with it even though I got a C in paper 2, if I do fail surely I can appeal as well
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andid1
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#51
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#51
(Original post by mad-s)
also does it matter if I get say a C in paper 2 and an A in paper 1 as long as both marks out of 80 add up to 60% then I have achieved a B? and could I get into higher with it even though I got a C in paper 2, if I do fail surely I can appeal as well
Higher is a massive step up from Int 2. I got 100% in my prelim last year for INT 2 and only got 72% in higher. If you work hard you will manage but don't expect that it is going to be easy.
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CJN
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#52
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(Original post by mad-s)
I thought paper 1 was easy then I BOMBED paper 2 so badly and I don't know why when I think about it now it was easy. I got a B for my prelim and an A for my extended unit test so heres hoping im O.K. for paper 2 i've counted 27 guaranteed marks and i'm needing 3 for using formulas so can someone tell me if I got the marks for these.

For 4(b) I wrote: The coach got earned more points in less games

For 9 I didn't get the full thing but I did use the formula at first and get an answer: I used the A of S/ A of C formula then got an answer and timesed it by 2 cause theres 2 sides

For 14 I got the answer wrong again but for (a) I wrote out h= 15*tan25 + 1.7 and for (b) 18.6 = 15*tanX + 1.7

are any of these worth anything? cause im DESPERATE to pick up marks I dont know why I didnt just to 12 and 14 right cause I know how to I literally had a bad day, im terrified :eek3:
In 4 (b) it is not strictly true that they played less games - the SD just shows that when they did play they got closer scores together (like instead of playing two games and getting 10 and 50, they played two and got 30 and 40).

In 9 you needed to use the Sine rule A/sinA = B/sinb - it is correct to times it by two but then you also need to work out the area of the rectangle bits and add that on.

You might get a mark or two for 14.
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rachiesy
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#53
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I will post my answers to paper 1 later if anyone wants them (though I doubt anyone's really that bothered )

Paper 2

1. £155000
2. 150, 200, 10
3. 11
4. a) i) 7
ii) 4
b) Better, more consistent (i did expand of course)
5. y=-2, x=7
6. 3s/2
7. p/2 - B
8. 4 root 7
9. 8894 cm squared
10. a) (x+7)(x+3) -> x squared + 7x + 3x + 21 -> x squared + 10x + 21
b) -3 or -7
11. 25.33
12. 126.48
13. 3.45
14. a) 8.69
b) 48.07 degrees

Is anyone's answers definitely right?
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CJN
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#54
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(Original post by rachiesy)
I will post my answers to paper 1 later if anyone wants them (though I doubt anyone's really that bothered )

Paper 2

1. £155000
2. 150, 200, 10
3. 11
4. a) i) 7
ii) 4
b) Better, more consistent (i did expand of course)
5. y=-2, x=7
6. 3s/2
7. p/2 - B
8. 4 root 7
9. 8894 cm squared
10. a) (x+7)(x+3) -> x squared + 7x + 3x + 21 -> x squared + 10x + 21
b) -3 or -7
11. 25.33
12. 126.48
13. 3.45
14. a) 8.69
b) 48.07 degrees

Is anyone's answers definitely right?
9 and 10 b are the only ones you got wrong.
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mad-s
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#55
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#55
@ CJN

thanks for helping but for 9 it actually is A of S/A of S..well I think lol cause it actually mentions a sector and a radius and there is an angle in the centre of it, and I actually made a mistake I have 26 guaranteed marks so I need 4...im hoping I get about 2 for Q9 2 for Q14 and maybe one for Q4(b) but even if I get a C my paper one was so good I think I might get an overall B...i'm like literally praying haha
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mad-s
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#56
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#56
A of S/A of C*
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CJN
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#57
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(Original post by mad-s)
@ CJN

thanks for helping but for 9 it actually is A of S/A of S..well I think lol cause it actually mentions a sector and a radius and there is an angle in the centre of it, and I actually made a mistake I have 26 guaranteed marks so I need 4...im hoping I get about 2 for Q9 2 for Q14 and maybe one for Q4(b) but even if I get a C my paper one was so good I think I might get an overall B...i'm like literally praying haha
No its definitely right.

the area of the whole circle can be calculated. The whole circle is 360 deg / 2pi radians.

65 deg is 18% of the whole circle, so it is just 18% of the area.
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rachiesy
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#58
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(Original post by CJN)
9 and 10 b are the only ones you got wrong.
Oh wow, that's not bad at all
I'm potentially looking at an A then?
Thank you!!!
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CJN
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#59
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(Original post by rachiesy)
Oh wow, that's not bad at all
I'm potentially looking at an A then?
Thank you!!!
I guess do I dunno what the cut offs are for int 2 and you will get marks for correct working done in those questions as well.

If you have paper 1 I can give you answers for that as well
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rachiesy
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#60
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I could scan and upload paper 1, but my answers are scrawled all over it :/
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