Mathematics: Post your doubts here!

[chum1234]

Guys how did u show that quadratic eq thing ?? 600/x+20 -1.5 ??

 

[masterex567]

Guys how did u show that quadratic eq thing ?? 600/x+20 -1.5 ??

that took me time! but i got it
600/x - 600/x+20 = 1.5 then simplify forward and divide by 1.5

 

[chum1234]

hmmm ok seems so easy now ;( i didnt have enough time

 

[LE DON 007]

so

a=-5, b=-1, c=12
Ratio for men to women, Idk I wrote 11:15
Lighthouse closest distance question was sine rule straight line from L to the path of the ship B angle was given
what about probability??

sorry but ur a,b and c afre wrong brother ,because you has to draw a line and get value of x where that line touches the graph right hand side you get value of x=1.8 and then substitute it in the equation .

 

[Tozu Fofo]

Guys what answers did you write for the probability question (in the last question) please explain with steps

 

[Tozu Fofo]

thanks in advance

 

[Ahmed Elsiddig]

How was the Maths 42 exam? , nearly everyone at school said it was hard. What do you people think? does the A* deserve to be lowered this year or is it only my classmaates that found it difficult

 

[masterex567]

so

sorry but ur a,b and c afre wrong brother ,because you has to draw a line and get value of x where that line touches the graph right hand side you get value of x=1.8 and then substitute it in the equation .

how would you get three values of a b and c from substituting. I've never seen something like that in a past paper
Normally, algebraic rearranging always does the job for such questions, if you check previous years too they retain that format.

 

[masterex567]

What was really hard in this paper? Everyone is overrating it so much even though it was just a bit tricky..

 

[Abdurrahmanmuhammed]

so anything above 166 was A* in 2013 and that paper was really easy i tried it ....

may june 14 42 and 22

 

[Abdurrahmanmuhammed]

O,S,O or S,O,O or O,O,S = (4/8 * 1/7 * 3/6) + (1/8 * 4/7 * 3/6) + (4/8 * 3/7 * 1/6) = 3/28.

how does the denominator reduce ? they did not mention without replacement or with

 

[masterex567]

exactly, a,b,c values were supposed to be integers, not decimal values from the graph.

do you remember the function of the graph? Something like x2 - 12/x or something?

 

[UsamaFTW]

do you remember the function of the graph? Something like x2 - 12/x or something?

It was x^2 - 2x + 12/x. and the line was y=3x+1

 

[masterex567]

It was x^2 - 2x + 12/x. and the line was y=3x+1

Thanks!
So did you get a as -5, b as -1 and c as 12?

 

[UsamaFTW]

Thanks!
So did you get a as -5, b as -1 and c as 12?

yup

 

[Tozu Fofo]

Rule of math (paper 4) hahaha

 

[masterex567]

The whole paper 4 is here: http://justpastpapers.com/wp-content/uploads/2015/05/Untitled1.pdf :O

 

[AnonymousX9]

The whole paper 4 is here: http://justpastpapers.com/wp-content/uploads/2015/05/Untitled1.pdf :O

so was our abc answer correct? for the graph???

 

[masterex567]

so was our abc answer correct? for the graph???

Yup, looks like!
Can't believe i failed bearings, the paper looks so much easier now that i'm seeing it. :/

 

[XxChampXx]

Anyone doing add maths on 9th June and 11th June?