Mathematics: Post your doubts here!

[Mai(M4!)]

Hey i need help in this x_X
The ratios of teachers : male students : female students in a school are 2:17:18
The total number of students is 665
find the number of teachers

teachers:male students:female students=2:17:18
total ratio of students =17+18=35
35 represents 665 students
so 2 represents (2*665)/35=38

 

[Layla..]

dubi2pro
Mai(M4!)
Can you guys help explain Q 3 part b ii) From 2013 May/june P41? Thanks

 

[Mai(M4!)]

It's actually 128, not 288 but thanks for your help! I appreciate it.

u r right
sorry i haven't read the question properly i forgot that 62.5% is of the remaining pages
here is the right one
100%-25%=75%
62.5% of 75=46.875%of the total number of pages in the magazine
75%-46.875%=28.125%
28.125% represents 36 pages
so 100% represents (100*36)/28.125%=128
128 pages = the total number of pages in the magazine

 

[Mai(M4!)]

dubi2pro
Mai(M4!)
Can you guys help explain Q 3 part b ii) From 2013 May/june P41? Thanks

please copy the url next time u ask
u have 200 students
then the probability will be number of students/200
0.3=3/10
number of students/200=3/10
f0r 10 to be 200 it is multiplied by 20
so multiply 3 by 20 to find number of students
3*20=60
then when the frequency is 60
he mentioned that it is greater than m so 60 from the end not from the start
200-60=140
140 from start
which is the last one in 2<m<=4
so M=4

 

[Mai(M4!)]

"JACKPOT" How to solve? I'm terrible at sequences... O/N 2012 - 43 View attachment 41681

the first one is reduced by 2 so 6th term =1
-2n+13
the second one is n^2 so the 6th term is 6^2=36
if u noticed that the third sequence is =b+n as when you add to 1+1=2, 16+4=20
so (n^2)+n
6th term =6^2+6=36+2=38
the forth one so the 6th term = 3^6=729
the fifth = the forth-the third, as 3-2=1, 81-20=61
so nth term=(3^n)-((n^2)+n)
the 6th term=729-38=691

 

[pyaparus]

what do u need in transformation

I need the thing abt shear strech also rotation..plz help exam tomorrow

 

[dubi2pro]

(a)u need to find the other two angles first
angle BDC=BAC=28
DXC=180-DXA =180-52=128(as they are on a straight line)
sum of interior angles of triangle =180
than 180-128-28=XCD=24

(b)angle QPS=22x/2=11x
as PQRS is a cyclic then sum of opposite angles=180
s0 11x+25x=180
36x=180
x=180/36
x=5

really helped! thanks a bunch!

 

[The Chill Master]

Help nedded
Awesome12
ahmadumar
Mai(M4!)
Thought blocker
shoaib672002
***amd***
Emadthegreat

 

[Bilal ashraf]

teachers:male students:female students=2:17:18
total ratio of students =17+18=35
35 represents 665 students
so 2 represents (2*665)/35=38

THANK YOU SO MUCH

 

[The Chill Master]

help can anyone please explain m/j/2010/41 0580 question 8 part c
Awesome12
ahmadumar
shoaib672002
Thought blocker
***amd***
Emadthegreat

 

[Awesome12]

help can anyone please explain m/j/2010/41 0580
Awesome12
ahmadumar
shoaib672002
Thought blocker

Which question?

 

[The Chill Master]

Which question?

question 8 last part

 

[Awesome12]

question 8 last part

Find the inverse of the equation : y = f (x)
And then substitute 1.7 in x. Draw the line and then solve it like you did before

 

[The Chill Master]

Find the inverse of the equation : y = f (x)
And then substitute 1.7 in x. Draw the line and then solve it like you did before

how can i find inverse of x f(x)=2^x please Awesome12

 

[QatarOwnz]

need help on this one
11b) http://puu.sh/8GoK4.png

 

[Awesome12]

need help on this one
11b) http://puu.sh/8GoK4.png

 

[Emadthegreat]

The Chill Master draw it on a graph, plot values of x(3 min) draw a line x=y.
Then reflect the line u made 2^x pn the line x=y. check where it meets 1.7 answer!

 

[The Chill Master]

The Chill Master draw it on a graph, plot values of x(3 min) draw a line x=y.
Then reflect the line u made 2^x pn the line x=y. check where it meets 1.7 answer!

but the answer given is 3.2 to 3.4

 

[Emadthegreat]

when it meets 1.7, asnwer!

but the answer given is 3.2 to 3.4

 

[Mavilda Bucket]

whats center of enlargement?