Mathematics: Post your doubts here!

[Kumkum]

if u dont mind cud u plz do it..coz thats wat i did but wasnt getting the ans

sure just wait

 

[Kumkum]

if u dont mind cud u plz do it..coz thats wat i did but wasnt getting the ans n that other question in the other post q10(iii)

eqn of curve:
y= 4x - (x^2 / 2) + 3
eqn of normal :
y = -x/2 + 10
so,
-x/2 + 10 = 4x - x^2 / 2 + 3 , multiply everything by 2
-x + 20 = 8x - x^2 + 6
x^2 - 9x +14 =0
x^2 - 7x -2x + 14 =0
x(x-7) - 2(x-7) = 0
(x-2)(x-7) = 0
x= 2 or 7
when x =7
y= -7/2 +10 = 6.5 , hence Q (7,6.5)
when x=2
y = -2/2 +10 = 9, hence P (2,9)

 

[19islandprincess96]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w12_qp_33.pdf

I don't get how to do Q7, Q8 ii, Q9 ii or 10... Basically last half of the paper... This paper kills...
Someone please help? Please?

 

[Iffat]

eqn of curve:
y= 4x - (x^2 / 2) + 3
eqn of normal :
y = -x/2 + 10
so,
-x/2 + 10 = 4x - x^2 / 2 + 3 , multiply everything by 2
-x + 20 = 8x - x^2 + 6
x^2 - 9x +14 =0
x^2 - 7x -2x + 14 =0
x(x-7) - 2(x-7) = 0
(x-2)(x-7) = 0
x= 2 or 7
when x =7
y= -7/2 +10 = 6.5 , hence Q (7,6.5)
when x=2
y = -2/2 +10 = 9, hence P (2,9)

k thanx

 

[Kumkum]

Iffat
i hope this answers ur question for number 10 on the other ppr. where c is the x co-ordinate of the vertex.

 

[syed1995]

can somebody help me with this
special request to @daredevils

Assume B is 100.

A is 40% more than B .. so A = 140

B is 20% less than C.
B = 80/100 * C
100 = 80/100 *C

C = 125

A:C
140:125
A:C = 28:25

 

[asexamskillme111]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s10_qp_43.pdf

Can someone do Q7? I think I've asked a question like this before. I don't get why only box A is involved in the calculation for part ii. I also don't get how to go along solving for part iii. Thank you.

 

[A star]

http://papers.xtremepapers.com/CIE/...AS Level/Mathematics (9709)/9709_s06_qp_6.pdf Q2 part (ii) i dont get this

 

[syed1995]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s06_qp_6.pdf Q2 part (ii) i dont get this

P(S given B) = P(S|B) / [P(S|B)+P(S`|B)]

= (0.2*0.75) / (0.2*0.75+0.8*0.4375)
= 0.15 / (0.15+0.35)
= 0.15 / 0.5
= 0.3 Answer

 

[parthrocks]

I have almost tried this several times but then I give up..Help me

Can someone please help me out with this problem!
syed1995
littlecloud11
wajiman
@kKumkum

 

[parthrocks]

this is the problem!

 

[syed1995]

I have almost tried this several times but then I give up..Help me

This question is for a cricket fan you need to know that only those innings get counted in which a batsmen bats and gets out.

65 Total matches..

Innings he got to bat .. 65-16 = 49

Innings in which he got out = 49 - 9 = 40

His old average was 47 .. so he scored 47*40 runs = 1880 runs

he got out on 129 in his next inning (41st Out) .. (1880+129)/41 = 49

His new average is 49.

Check the answer

 

[syed1995]

this is the problem!

Solved above.

 

[parthrocks]

This question is for a cricket fan you need to know that only those innings get counted in which a batsmen bats and gets out.

65 Total matches..

Innings he got to bat .. 65-16 = 49

Innings in which he got out = 49 - 9 = 40

His old average was 47 .. so he scored 47*40 runs = 1880 runs

he got out on 129 in his next inning (41st Out) .. (1880+129)/41 = 49

His new average is 49.

Check the answer

The answer for this one is absolutely correct and Igot how u did it!!thanks a ton friend!!I forgot to take -9....

 

[Fatima18]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s10_qp_11.pdf
Hello!Number 6 guys?

 

[parthrocks]

One more:-
If the price of rice is raised by 100/3 % then by what percentage must a person reduce his consumption of rice so as not to increase his expenditure!
I understood it but how should I start with it.....can anyone plz tell me how to check and wat statement should i look first which is catch and then how to solve it?

 

[parthrocks]

One more:-
If the price of rice is raised by 100/3 % then by what percentage must a person reduce his consumption of rice so as not to increase his expenditure!
I understood it but how should I start with it.....can anyone plz tell me how to check and wat statement should i look first which is catch and then how to solve it?

daredevil
syed1995

 

[Fatima18]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematicsat (9709)/9709_s10_qp_11.pdf
Hello!Number 6 guys?

Also, I wanted to ask, I've covered the chapter of differentiation bt havent done extending differentiation yet...We will be doing that next term..So which topic is this question related to?

 

[parthrocks]

This one!AM is aritmetic mean and gm is geometric mean anyone?

 

[parthrocks]

Also, I wanted to ask, I've covered the chapter of differentiation bt havent done extending differentiation yet...We will be doing that next term..So which topic is this question related to?

Its extending differntiation of more but common basic of differentitaion will help you out!