Mathematics - 3 June 2007

solve for x

1. x(2x+1)-2(x+1)=2(X-1)

2. (x+2)(2x-1)=2x(x+3)

3. x^2-3=(2+x)(3+x)


Thanks!

2007-06-03 23:18:57 · 7 answers · asked by Jane 1

2007-06-03 23:12:53 · 7 answers · asked by vivek k 1

2007-06-03 23:10:29 · 19 answers · asked by team r 1

This is the problem.
Today a boy is twice as old as he was 4 years ago.

Let b = the boy's age today

b = 2 (b - 4 years)
b = 2b - 8 years
b = 8 years

My question is how did 2b-8 become 8?? Shouldn't it have been figured

b = 2b - 8 (move the b to the other side)
2b - b = -8
b = -8


I know I'm wrong and he can't be a negative 8 yrs old but in the equation, isn't negative 8 the right answer and not 8?

2007-06-03 23:10:19 · 13 answers · asked by Anonymous

maths.

2007-06-03 22:13:29 · 2 answers · asked by cookies_rule_91 3

Hi, can anybody help me solving this integeration ?
Using this substitution:
x = p - t
Integerate
I = ∫(x.sin(x).dx)/(1+cos(x)^2)
From 0 to p.

2007-06-03 21:52:15 · 5 answers · asked by Anonymous

prove that
p(x,y) <= d(x,y) <= (sqrt(n)) p(x,y) holds in Rn
where
p=square metric define by p(x,y)=max{|x1-y1|, ..., |xn-yn|}
d=euclidean metric define by d(x,y)=sqrt( (x1-y1)^2 + ... + (xn-yn)^2 )
x=(x1,x2,x3,...,xn)
y=(y1,y2,y3,...,yn)

2007-06-03 21:33:15 · 2 answers · asked by nuts 1

In how many ways can 15 gifts be distributed equally :
a) among Ada, Beda and Ceda
b)into three parcels of five gifts each

2007-06-03 21:13:46 · 4 answers · asked by Anonymous

Could someone please help me with this question, and tell me how to do it. Exam today at 2 O'clock !!!!!!!!

http://www.gcsemathspastpapers.com/images/p5j01q52.gif

2007-06-03 21:11:47 · 5 answers · asked by Anonymous

if i take ln to both sides, does it turn into lny=lnx^10-ln3?

2007-06-03 21:09:47 · 3 answers · asked by Shukie L 1

sin x - cos x = 0
I dont get it. What do i do?

2007-06-03 20:23:43 · 10 answers · asked by pretty shy 3

What is $458.69 divided by 4? (In money)

2007-06-03 20:19:11 · 7 answers · asked by Anonymous

Should be in general form and how to determine the roots algebraically

2007-06-03 19:58:53 · 2 answers · asked by khan gee 1

Still helping the children! Thankgoodness this is these last few questions posted are the last questions that I need help with to help them! If you can, I would really appreciate it if you look at my other questions! The stuff they have to learn today makes my eyes cross! Please put all of the work and any formula you had to do as part of your answer, I need it to understand and then further explain it to him! Thankyou for all of the help.
(I had to create this account because my other one isnt working very well, Thanks!)


Determine the angle that makes the following statement true.

sin 45° = cos________

2007-06-03 19:53:49 · 10 answers · asked by Anonymous

Still helping the children! Thankgoodness this is these last few questions posted are the last questions that I need help with to help them! If you can, I would really appreciate it if you look at my other questions! The stuff they have to learn today makes my eyes cross! Please put all of the work and any formula you had to do as part of your answer, I need it to understand and then further explain it to him! Thankyou for all of the help.
(I had to create this account because my other one isnt working very well, Thanks)

The point ( - 6, 8 ) lies on the terminal arm of ∠A in standard position. Find sin A and cos A.

Best explained (and hopefully correct!) answer gets the points.

2007-06-03 19:42:30 · 4 answers · asked by Anonymous

2007-06-03 19:38:22 · 7 answers · asked by Tas Chowdhury 2

Need help with these:
Factorise the following:

x^3+8

and

(x^4-27x)

Thanks

2007-06-03 19:15:12 · 3 answers · asked by Anonymous

if Pr(A|B) = 0.3 and Pr(B) = 0.6, find Pr(A n B)

2007-06-03 18:54:51 · 3 answers · asked by Anonymous

Solve each equation (write the general solution)

1/2 sec x -1 = 0

the book has a bunch of formulas and stuff but i have no idea what they're talking about. Can you help me find the answer?

2007-06-03 18:50:04 · 7 answers · asked by pretty shy 3

1. (x cubed-2x-5x+6)/(x-3)
2. (x cubed - 5x squared-x+5)/(x-5)
3. (2x cubed-5xsuqared-4x+3)/(x+1)
4. (2xcubed-3xsquared-3x+2)/(x-2)
5. (a to the fourth power - 1)/ (a-1)
Can you explain how to do them cuz i dont get it.

2007-06-03 18:46:10 · 2 answers · asked by cfishot 2

It says write a polar equation of a conic with the focus at the origin and the given data.

It is an ellipse, eccentricity = 1/2, and directrix r= 4secθ

I don't get how to use the given directrix, can anyone help?

2007-06-03 18:45:23 · 2 answers · asked by Secret 2

Still helping the children! Thankgoodness this is these last 5 questions posted are the last questions that I need help with to help them! If you can I would appreciate it if you looked at the other four! The stuff they have to learn today makes my eyes cross! Please put all of the work and any formula you had to do as part of your answer, I need it to understand and then further explain it to him! Thankyou for all of the help!


What is the smallest angle in a triangle with sides 3 cm, 5 cm, and 7 cm? Round your answer to the nearest tenth.


Best explained answer gets the points.

2007-06-03 18:44:40 · 4 answers · asked by Anonymous

Still helping the children! Thankgoodness this is these last 5 questions posted are the last questions that I need help with to help them! The stuff they have to learn today makes my eyes cross! Please put all of the work and any formula you had to do as part of your answer, I need it to understand and then further explain it to him! Thankyou for all of the help!

An aircraft flying at an altitude of 2000 m is approaching an airport. If the angle of depression of the airport is 5°, what is the distance from the plane to the airport measured along the ground? Round your answer to the nearest tenth of a kilometre.

2007-06-03 18:30:43 · 5 answers · asked by Anonymous

2007-06-03 18:04:59 · 3 answers · asked by Anonymous

In a test for the breaking strength of concrete slabs for freeway construction, 3 of the 200 slabs tested did not meet the safety requirements. What percent of the slabs tested met the safety requirements?

2007-06-03 18:01:05 · 13 answers · asked by Transformers20 2

many questions like angles,area of triangle use lines.we even need to underline stuff with lines.

2007-06-03 17:59:43 · 3 answers · asked by pro 1

i have a trigonometry word problem its asking ( Steve wants to find out the height of a pole that is sitting on the roof of a nearby building. The angle of elevation from the ground to the top of pole is 40 degrees. The angle of elevation from the ground to the bottom of the pole is 28 degrees. The distance on the ground between Steve and the building is 30 metres. How tall is the pole? ) Can someone who me how to do this thank you very much!

2007-06-03 17:57:43 · 2 answers · asked by crocop49 1

2007-06-03 17:52:44 · 8 answers · asked by Anonymous

2007-06-03 17:49:42 · 5 answers · asked by Anonymous

The strength of gravity on Earth relative to the moon is 6:1. How much would a person weigh on the moon if they weigh 150 pounds on Earth?

2007-06-03 17:44:47 · 13 answers · asked by vanessandavid 1