Mathematics - 21 October 2007

Q1 If A= list the elements of the following subsets of A.

1) {Number divisible by 6}
2) {Number divisible by 7}
3) {Number divisible by 4}

Q2 The universal set E is the set of all triangles. Given that
A = {isosceles triangles}
B = {equilateral triangles}
C= {obtuse – angled triangles}

Q3 Using the set identities prove that the distributivity of union over intersection
i.e. A U (B ∩ C) = (A U B) ∩ (A U C)

2007-10-21 03:53:07 · 2 answers · asked by sameerg 1

(x-10)(x-2)=-2
I'm not sure if I am doing this right. anyone who can show me how to do this please. Thankyou

2007-10-21 03:19:54 · 7 answers · asked by sumguy 1

I am given the equation x(x^2-3), x=2
I have already fond the gradient (m). I found first the derivative F'(x) which is f'(x)= 3x^2-3, and later on I found the F'(2), which gave me 9, so the gradient is 9
Now I must find the equation of the tangent, for the time being I have
Y= mx+b
So
Y= 9x+b <-- I have tried but I can't find the value of B, do you know how to find it?

Thank you very much!
Any help is much appreciated! =)

2007-10-21 03:17:57 · 4 answers · asked by Blue Skies 1

When V = we^(w/10)

What is dV/dw?

(I am getting confused as to whether i should use the chain or product rule)

2007-10-21 03:17:04 · 2 answers · asked by C4 Snake 3

2007-10-21 03:08:24 · 10 answers · asked by nature walker 2

f(x)=x^4-4x^3+2

2007-10-21 03:01:10 · 4 answers · asked by nala 1

i just need a basic answer

2007-10-21 02:23:02 · 3 answers · asked by pebbles. 3

Dy/dx + xy = xy2 when x=0, y=2

(1-x2)*Dy/dx – xy = xy2

(Dy/dx)^2 = (x+1)/(x+2)2

Ln (Dy/dx) = x+y; when x=0, y=0

2007-10-21 01:45:49 · 4 answers · asked by Sajith R 1

(d^2y/dx^2) + 7(dy/dx) +12y=0,
y(0)=1,
dy/dx(0)=3.

Find lim(x->infinity) y(x)

2007-10-21 00:56:09 · 4 answers · asked by Anonymous

In my quest to better understand trigonometry, It would be cool for someone to manually (dont use a calculator) calculate cos(256) and show me how they did it, include every step :)

Don't explain to me what cos does, just work it out and show me every step, I'll try to figure it out on my own.

Thanks

2007-10-21 00:54:49 · 5 answers · asked by Anonymous

if we climb the stairs steps 2 at a time then there will be 1 step remaining ,,, if we climb 3 steps at a time then there will be 2 steps left , if we climb 4 steps at a time then there will be 3 steps left , if we climb 5 steps at a time then there will be 4 steps left , if we climb 6 steps at a time then there will be 5 steps left ,, if we climb 7 steps at a time no steps are left ,,,ok the question is what is the total number of steps and write me the equation or how did u figure it out ,,,, hint ,,, the number of stair steps is 119 ,,, just tell me how u got it ?? pls write the equation ,,,, thank u

2007-10-21 00:49:51 · 2 answers · asked by k k 72 2

Find the solution y(x) to the initial value problem

(d^2y/dx^2) + 7(dy/dx) +12y=0,
y(0)=1,
dy/dx(0)=3.

Find lim(x->infinity) y(x)

2007-10-21 00:12:02 · 1 answers · asked by Anonymous

what is the set of relation of xy=6 if the set of answers are all integers?

2007-10-21 00:08:57 · 3 answers · asked by austere 1

how do u expand the equation: (x+1)(x-1)(x-3)?

2007-10-21 00:08:20 · 3 answers · asked by Anonymous