Maths, Addmaths and Statistics: Post your doubts here!

[usama321]

by the way what issue do you have with my caps lock

using caps lock is against the forum rules A moderator might warn you, so do try abstain from it

 

[Snowysangel]

(a)total score:9*3=27
the middle score is 8 so the other two total 19
difference of 7 between them: x+x+7=19
2x=12
x=6
scores 6,8,13

(b)total score:11*4=44
difference is the score 4 fourth game:44-27=17

Why is the total score 27? I know it's because 9 is the mean but I still don't get it

 

[TheStallion-Reborn]

http://freeexampapers.com/#O Level/Mathematics D (Calculator)/CIE/2007 Jun
sum1 please help me with question 8 (paper 1) and the concepts applied..danial 234

 

[chocolate_girl]

Can some1 please tell me which is the hardest math syllabus D paper 1, i want to try it

 

[danial 234]

Why is the total score 27? I know it's because 9 is the mean but I still don't get it

bcoz mean=sum/no of things or games
then sum = mean*no of games

 

[chocolate_girl]

Also please tell me the formula for expression when the diff between sequences is same and formula to find determinant |a| and lastly to find length from given cocodinates

 

[areela hassan]

1/1-x +2/1+x +2x/x2 -1 I know it's an easy question but someone please tell me how to simplify these types of questions

 

[danial 234]

F

http://freeexampapers.com/#O Level/Mathematics D (Calculator)/CIE/2007 Jun
sum1 please help me with question 8 (paper 1) and the concepts applied..danial 234

It might be a bit unclear but hope that it is of usep

 

[TheStallion-Reborn]

F
It might be a bit unclear but hope that it is of usep

yea i saw the same thing in a topical...but HOW??

 

[danial 234]

Also please tell me the formula for expression when the diff between sequences is same and formula to find determinant |a| and lastly to find length from given cocodinates

matrix is =(a b)
( c d)
then find determinant =(a*d)-(c*b)
Length frm coordinates
e.g.
A(2,3) b(4,6)
length= underroot( (4-2)^2 +(6-2)^2)

 

[TheStallion-Reborn]

F
It might be a bit unclear but hope that it is of usep

and what i knw about vectors is tht p-q will mean a line from q to p.....with arrows towards p....

 

[danial 234]

yea i saw the same thing in a topical...but HOW?? [/q
you have to find OR then OR=OP+PR
in this case OP is p
as per ques OR=p-q
so this indicates that PR= -q
find q
then draw -q taking P as origin
B)
OS=OQ+QS
OS=q+hp
so
QS=hp
remember that hp and p are parallel and they hv a relation
just find p and hp and then find h

 

[Amnaa]

can anyone please explain me the concept pf upper and lower bound....!!! please

 

[Tulaib]

I understood the part that to make cubic number which 2 is already in cubic form.... But I dont get that part of k (3)(5^2), how r these made into cube numbers and u took 5^2??

look, in the factors of 360 we have 3^2 n 5^1 other than 2, to make each of 3 n 5 a cubic no. we must multiply it with 3^1 so it will become 3^3 n with 5^2 so it will become 5^3

 

[danial 234]

can anyone please explain me the concept pf upper and lower bound....!!! please

suppose u have a value of length of rope 98 cm rounded to the nearest 1 cm
to find its upper bound
98+(1/2)=98.5
lower bound
98-(1/2)=97.5
take another example
length of rectangle is 100 cm rounded to nearest 10 cm
breadth of rect is 55 cm rounded to nearest 5 cm
then upper bound for area= (100+10/2)*(55+5/2)
look to d4 for more help

 

[farhan141]

an easier way would be to just make pairs of arcs from corresponding vertices of the triangle, and make the perpendicular bisectors that way. There is lesser chance of error, and less time wasted

And what shud be the length of the arcs?

 

[danial 234]

And what shud be the length of the arcs?

any length can be taken but it should be same for the corresponding vertices

 

[chocolate_girl]

matrix is =(a b)
( c d)
then find determinant =(a*d)-(c*b)
Length frm coordinates
e.g.
A(2,3) b(4,6)
length= underroot( (4-2)^2 +(6-2)^2)

Thankyou could you please tell me the formula for finding expression in terms of n in number sequence questions when the difference between sequence is same and also the determinant formula for a vector like (1,2)

 

[danial 234]

Thankyou could you please tell me the formula for finding expression in terms of n in number sequence questions when the difference between sequence is same and also the determinant formula for a vector like (1,2)

this might be helpful for number sequences
https://www.xtremepapers.com/community/threads/mathematics.4806/
i think that determinant is only for square matrices

 

[farhan141]

I'll

any length can be taken but it should be same for the corresponding vertices

try it