Maths, Addmaths and Statistics: Post your doubts here!

[DaniyalK]

explain it plz???View attachment 43534

a) 4/(4+5)

b) There are a total of 7 'units' (3+4). The unit of girls is 1 more than boys. That means 1 unit represents 120.
1 : 120
7 : x
cross multiply and solve.

 

[Mahnoorfatima]

Angle B is 53.4 correct to the nearest tenth of a degree (0.1)

0.1/2 = 0.05
53.4 + 0.05 = 53.45 --> UB
53.4 - 0.05 = 53.35 --> LB

Upper Bound of Angle C so Angles A and B must be smallest (LB) to get highest C.
Upper bound of C = 180 - LB of A - LB of B
UBC = 180 - 53.35 - 61.5 => 65.15

Nearest tenth of a degree? Isn't it supposed to be 10? :/

 

[DaniyalK]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w10_qp_12.pdf
Question 25 part a? .?

D = 0.5 * 20 * u
= 10u
2D = 20u
we already have 10u so we need to know the time by after which it travels another 10u
from the graph, it's t = 30s ( area of rectangle = 10 * u)

 

[DaniyalK]

Nearest tenth of a degree? Isn't it supposed to be 10? :/

Nearest ten degrees = 10
Nearest tenTH of a degree = 1/10

 

[kirann]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w10_qp_12.pdf
Question 25 part a? .?

distance travelled in the first 20 sec
1/2 (20)(u) =10u (area under the graph)
D=10u.....> eq 1
the car has travelled 2D meters at time t seconds from the start.
i.e distance travelled in the first t seconds =area under trapezium
2D= 1/2 (u)(t+t-20)
substitute the value of D from eq 1 and solve ull get the answer

 

[funky brat]

http://papers.xtremepapers.com/CIE/...(Calculator Version) (4024)/4024_w04_qp_1.pdf
Question 11 b part.
Question 24, can anyone construct the locus please?

 

[funky brat]

Can somebody tell that f- common difference formula, I just forgot. :/

 

[mohammad ahmed]

Q25
http://papers.xtremepapers.com/CIE/...Calculator Version) (4024)/4024_w10_qp_12.pdf

 

[DaniyalK]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w04_qp_1.pdf
Question 11 b part.
Question 24, can anyone construct the locus please?

0 = x^2 + x -12
solve to get 2 values for x. Negative one will be l and positive one will be m.
For 24, draw a circle of radius 5 cm, center C then the angle bisector of B. P will be the point where the angle bisector cuts the circle inside the triangle.

 

[funky brat]

Pattern/nth term formula?

Yeah.

 

[FLRNAB]

Yeah.

https://sites.google.com/site/urbangeekclassroomsg/emath-classroom/number-sequences

 

[funky brat]

0 = x^2 + x -12
solve to get 2 values for x. Negative one will be l and positive one will be m.
For 24, draw a circle of radius 5 cm, center C then the angle bisector of B. P will be the point where the angle bisector cuts the circle inside the triangle.

Thanks a lot.

 

[funky brat]

https://sites.google.com/site/urbangeekclassroomsg/emath-classroom/number-sequences

Thanks.

 

[DaniyalK]

Q25
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w10_qp_12.pdf

part a is solved above.
b) Acceleration from t 0 to 20 = u/20
Deceleration = (u/20)/2 = u/40
a = (final velocity - initial velocity)/time
- u/40 = (u/4 - u)/t
-ut = 10u - 40u
-ut = -30u
t = 30
That's 30 seconds since deceleration started so total time = 60 + 30 = 90s

 

[asadalam]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w04_qp_1.pdf
Question 11 b part.
Question 24, can anyone construct the locus please?

Q24:

At first i thought to make a bisector of A,but before uploading i reread it....you can see for yourself.

 

[kirann]

heres a question with its m.s i dont know where m i making mistake but in the last part of the question i dont think so 4 would be included but it is here in the marking scheme
can anybody solve the last part only ?? plz

 

[asadalam]

Can someone post all the matrix of transformations; how to sketch matrices etc etc. Not the Matrices chapter - just the matrix part of transformations

 

[funky brat]

http://papers.xtremepapers.com/CIE/...(Calculator Version) (4024)/4024_w04_qp_1.pdf
Question 17 b part, anyone?

 

[Muhammad_Hamza]

???

 

[***amd***]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w04_qp_1.pdf
Question 17 b part, anyone?

"g (0)" means the value of x = 0
g (0) = 15 means, when the value of x is "0", (2x – 3) (x + k)= 15
do it this way, by putting 0 instead of variable x.

Once u find value of k, as u see g (x)=0
(2x – 3) (2x – 3)= 0 now.
so we say either (2x – 3) = 0, or (2x – 3)= 0
thats it. do it urself