IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => IGCSE/ GCSE => Math => Topic started by: theigstudent on May 12, 2009, 08:11:01 am

Title: urgent help maths p 2 may 04
Post by: theigstudent on May 12, 2009, 08:11:01 am
Q 15 how do u solve it ???
Q18 b
Q19 b
Q 20 b 2
Q 22 c
plz help me because i m really bad at maths
reali worried abt tom maths pap :(


Title: Re: urgent help maths p 2 may 04
Post by: astarmathsandphysics on May 12, 2009, 08:31:25 am
Quote from: theigstudent on May 12, 2009, 08:11:01 am
Q 15 how do u solve it ???
Q18 b
Q19 b
Q 20 b 2
Q 22 c
plz help me because i m really bad at maths
reali worried abt tom maths pap :(




15aii)rhombus
bii)2

18b)800*1.12^0.25 since there are 4 periods of 3 months in a year

19b)Because the determinant is 10*3--2*-15=o
Title: Re: urgent help maths p 2 may 04
Post by: astarmathsandphysics on May 12, 2009, 08:36:44 am
20b)\frac{x^2-5x}{2x^2-11x+5}=\frac{x(x-5)}{(2x-1)(x-5)}=\frac{x}{2x-1}

22.a)y=0.5x+3

y>0.5x+3, y<7 and x>=2
Title: Re: urgent help maths p 2 may 04
Post by: theigstudent on May 12, 2009, 02:18:14 pm
thankyou
astarmathsandphysics


could u plz tell me which pap are these answers for
i wanted ans 4
pap2  may04
Q 15 how do u solve it
Q18 b
Q19 b
Q 20 b 2
Q 22 c
Title: Re: urgent help maths p 2 may 04
Post by: angell on May 12, 2009, 04:00:17 pm
Q15 is the similarity question...

so

(A1/a2)2=(l1/l2)
144/x2=99/11
99x2=1584
x2=16
x=4

Q18b) x= tan-1(78/83)? I think? :S

Q19b)
f(x)=x+1/2
g(x+1)/2= s(x+1/2)+1
=2x+2+2/2
=2x+4/2
=2(x-2)/2
=x+2

q20b) distance travelled = area under graph
= 1/2bh + lb
=1/2X10X18 + 20X18
=450

and q22c

BC = 38  0
       0   38
    = 38 ( 1 0
             0 1)
    = 38I

B X 1/38, C=I

Inverse of B is 1/38
 c= 1/38( 4   6
             5   -2)
B-1= (2/19  3/19
                      5/38   -1/19)