Mathematics - 18 October 2007

Solve for x

2007-10-18 22:48:36 · 5 answers · asked by zyntax24 1

Same question for all the odd permutations with an odd number of plus signs.
Are both numbers equal ?

2007-10-18 22:46:53 · 1 answers · asked by Anonymous

2007-10-18 22:38:45 · 15 answers · asked by kelvi 1

2007-10-18 22:35:30 · 9 answers · asked by ʌ_ʍ ʍr.smile 6

2007-10-18 21:52:51 · 2 answers · asked by Anonymous

2007-10-18 21:18:48 · 2 answers · asked by Anonymous

for example the item is based 700 and you sell it for 3500.

2007-10-18 21:16:50 · 6 answers · asked by II 1

What is anti log of 3?

2007-10-18 21:15:02 · 6 answers · asked by sathish p 1

2007-10-18 21:13:15 · 2 answers · asked by stanleynickarz 2

Prove that if you pick 10 numbers from 1 to 1000, then there exists a pair where the larger of the pair is at most twice the other.

I'm imagining this has to deal with either a proof by contrapositive or contradiction. In the case of contradiction I would assume that there exists a set of 10 numbers from 1 to 1000 then for all pairs the larger of the pair is greater than twice the smaller. But I cant seem to find a flaw with that. I also tried creating a set of 10 where the numbers were evenly spaced out as far as possible (100, 200, 300) but it holds.

Any help would be great, thanks.

2007-10-18 21:06:48 · 6 answers · asked by David 2

1.Transform y=(3x+1)(x-2)+(x-3)squared in the vertex form...
2.Find the two positive integers whose sum is 19 & whose product is greater than or equal to 48 but less than 90. How many pairs of numbers will satisfy the conditions?
3.Find the value of k so that g(x)=kxsquared +3x -2 will have two real zeros.

...and please if you can, answer my first questions too. thanks!

2007-10-18 20:56:14 · 1 answers · asked by Anonymous

the area of a square is 45 more than the perimeter. find the length of a side.

and

the product of two positive consecutive even integers is 224. find the integers.

2007-10-18 20:28:02 · 11 answers · asked by abad9147 1

if 6 is added to the square of a number, the result is 22. find all such numbers.

and

The product of the page numbers on two facing pages of a book is 600. find the page numbers.

2007-10-18 20:18:01 · 3 answers · asked by abad9147 1

2007-10-18 20:15:54 · 9 answers · asked by Anonymous

2007-10-18 19:40:41 · 1 answers · asked by stanleynickarz 2

1. In each case, determine whether * is associative, whether * has an identity element and, if the latter is the case, whether each element of S has an inverse (with regards to *), ie whether S is a group:
(a) S={1,-1}, * ordinary multiplication of integers
(b) S= the subset of Q consisting of all positive rationals that have a rational square roots, *=ordinary multiplication of rationals
(c) S=R\{0}, the set of all non-zero reals with a*b=|ab|

2. From examples above that are groups, which are abelian?

3. Consider groups Z(subscript n) with binary operation being addition modulo n. Write down operation tables for
(a) n=4,5
(b) n=6

4.Prove that if G=, then G=

5. Let G be a finite group, and let g,x∈ G
(a) prove that x and g^-1xg have the same order
(b) Let a,b∈G. Prove that ab and ba have the same order

This is exam revision. I really appreciate the help. if possible i need full working out and explinations.

Thanks

Don

2007-10-18 19:15:33 · 1 answers · asked by Anonymous

my questions are 5question

2007-10-18 18:53:10 · 3 answers · asked by Anonymous

the - is takeaway not minus...

I think the answer is = 12y^2 -8y

but ime not quite sure, please tell me where i went wrong

thankyou maths experts!

2007-10-18 18:50:48 · 3 answers · asked by Anonymous

Two LORAN stations are placed 150 miles apart along a straight shore and act as the foci of a hyperbola. A ship records a time difference of 0.0005 second between the LORAN signals. Set up a rectangular coordinate system to determine where the ship would reach shore if it were to follow the hyperbola corresponding to this time difference. The speed of radio-signals is 186000 miles per second.










What is the equation of the hyperbola?



##6 (20 points). For the hyperbola 4x2 - 25y2=100, answer the following:


(a) What are the coordinates of the left vertex?



What are the coordinates of the right focus?




Write the equations for both asymptotes.

2007-10-18 18:49:21 · 2 answers · asked by Anonymous

2007-10-18 18:40:16 · 3 answers · asked by glamour girl 1

Minimize Q = x2 + 2ysquared subject to x+y = 5. Answer to 2 decimal places.

2007-10-18 18:31:58 · 1 answers · asked by Liz C 1

2007-10-18 18:30:42 · 8 answers · asked by fuzzy19 3

A 90% confidence interval around the variance was calculated. For n=27, the confidence interval was 35.0-88.4. Give the variance of the sample.

2007-10-18 18:20:32 · 1 answers · asked by scrappy1 1

Solve using systems of equations using elimination.

2007-10-18 18:17:07 · 12 answers · asked by Anonymous

(2x-2) / ( (x-1)(x²+x-12) )

becomes

(2x-2) / (x³-13x-12)

becomes

(2x-2) / ( x(x-1)(x-12)

giving me vertical asymptotes at x= -1 and -12??

2007-10-18 18:10:40 · 2 answers · asked by iSmile 2

Two cars travel the same distance. The first car travels at a rate of 40 miles per hour and reaches its destination in t hours. The second car travels at a rate of 55 miles per hour and reaches its destination 3 hours earlier than the first car. How long does it take for the first car to reach its destination?

2007-10-18 18:09:36 · 6 answers · asked by Anonymous

you have:a+b=90
Prove:
cos(a-b)=2sin(a)*sin(b)

2007-10-18 18:02:27 · 5 answers · asked by Amir B 1

8/6 is a fraction.

2007-10-18 17:54:22 · 5 answers · asked by Anonymous

find the limit x--> -infinity (e^x-e^(-x))/(e^x+e^(-x))

2007-10-18 17:09:48 · 4 answers · asked by kris 1

So I'm unable to get past these three problems at the end of my review. Please answer and explain them. First correct answer will surely get 10 points.
1. g(x)= x+b, x<0; -cos(x), x>= 0. Now is there a value that will make g(x) continuous at x=0. Is there a value for g(x) that makes it diffrentiable at 0. why/why not? give reasons.
2. y=lnx and y=e^x are inverse functions. the graph of y=lnx looks like it may be approaching a horizontal asymptote. write an argument based on the graph of e^x to explain why it does not.
3. find the points on the graph of y=sec x, 0= Thanks a lot guys.

2007-10-18 16:59:46 · 7 answers · asked by Crashovdr 4