Mathematics - 23 September 2007

the 1st cow gives 1 litre of milk
the 2nd cow gives 2 litres of milk
the 3d cow gives 3 litres of milk- - - - - - - - -so on- - - - - - - - - - - - -
the 99th cow gives 99 litres of milk

now divide the cows in such a way that each man gets equal share of milk
(hint-arithematic progressions)

2007-09-23 23:44:52 · 5 answers · asked by angel 2

5x-6 <= 3(2+3x)
5x-6 <= 6+18x --- drop 5x from both sides
-6 <= 6+13x --- subtract 6 from both sides
-12 <= 13x

-12/13 <= 13x/13

.923 <= x
did i do this correctly?

2007-09-23 23:44:40 · 9 answers · asked by cjay_cjay 2

make a solution where the disinfectant fluid is to be diluted with water to make a 20%solution you have 100ml of the disinfectant fluid . How much water should you add to the 100 ml of the disinfectant fluid to make a 20 % total solution? show calculations

2007-09-23 22:28:50 · 8 answers · asked by Anonymous

2007-09-23 22:14:52 · 2 answers · asked by Azalu 1

2007-09-23 21:57:39 · 3 answers · asked by shank622 1

Two pipes are bound tightly together with a very thin wire as in the diagram. The radii of the pieces are 2in and 6in. Neglecting any practical allowance for security (meaning only wrapped once), determine the minimal length of the wire.

i tried my best to do the diagram and upload it here, its rough but i think you can get the general idea. could someone please help me with it?

http://www.imagehosting.com/show.php/1174338_circle2.GIF.html

2007-09-23 19:51:37 · 3 answers · asked by Dancerx 4

our professory wants us to use ((x+h) -f(x))/h but anything will help

2007-09-23 19:21:53 · 6 answers · asked by stefankims 1

4GB (GB = 10^9 bytes)
MP3 player dimensions: 32mm X 24mm X 2.1mm

how many bytes of memory are stored in a cube whose sides are 100 micrometers?


so i understand that there is a total of 4.0X10^9 bytes in the entire mp3 player. there is also 10X10^6 micrometers cubed for each cube. i believe i should convert the total volume to micrometers, then divide the total volume by the volume of 1 cube. once i have that value, it should provide the total number of boxes. if that's correct, then i should be able to divide that value by the total number of bytes... but it's not workin' out.

someone please help me =)

2007-09-23 19:06:58 · 2 answers · asked by dBug 2

Given the curve with parametric equations x= t^2 - 1, y= 1-t^3, z=1-2t+t^2

Does it pass through the point A(3,-7,1)?

2007-09-23 19:04:52 · 5 answers · asked by km1988 1

Let L:R^2 ------> R^2 be a linear transformation such that
L(i+2j) = -2i+3j and L(i - j) = 5i+2j
a)Determine the matrix representing the linear transformation
b) Determine the value of L(7i+5j)

please help me :(

2007-09-23 19:02:32 · 2 answers · asked by Anonymous

I have these numbers for x axis
1.077
1.155
1.328
1.440
1.562
1.691
1.841

These for y axis
17.5
21.53
23.10
26.56
28.79
31.23
33.81
36.82

I got a slope of 26.56 is this right?

2007-09-23 18:47:38 · 1 answers · asked by Anonymous

–6x = 6

2007-09-23 18:31:17 · 6 answers · asked by too_b2000 1

Well this practice problem in my AP Calculus practice book has a strange problem giving me a hard time. It says:
"Each limit represents the derivate of some function f at some number a. State such an f and a in each case".

and the problem is...
lim h---> o of...
(1+h)^10 - 1
---------------- [divided by]
h

I tried using the definition of a derivative and also the alternate definition of a derivative [aka: derivative at a point] and I didn't quite get the answer from the answer key. So, how is this actually done?

2007-09-23 18:25:10 · 2 answers · asked by gatortheone 1

Enhance this diagram to include a circle that is circumscribed about the outer most figure - that means it touches (or is as close as possible to) all the vertices.

http://img227.imageshack.us/img227/5834/verticesey9.jpg

2007-09-23 18:13:25 · 2 answers · asked by ryan_macalinao5472 3

Hi, I'm stuck on a question about square matrices for quite a long time. Any help would be greatly appreciated!

1. Let A and B be square matrices with the same size.
a) Give an example in which (A+B)^2 =/ (does not equal to) A^2 + 2AB + B^2
b) Fill in the blank to create a matrix identity that is valid for all choices of A and B. (A+B)^2 = A^2 + B^2 + _______.

2. Let A and B be square matrices with the same size.
a) Give an example in which (A+B)(A-B) =/ (does not equal to) A^2 - B^2
b) Fill in the blank to create a matrix identity that is valid for all choices of A and B. (A+B)(A-B) = ____________.

Thanks!

2007-09-23 17:31:44 · 3 answers · asked by Mike S 1

(2) Scrooge decided to write a will. The will said that one fifth of his money would go to his nephew Fred. The rest would would be divided equally among the six Cratchit children. If Scrooge had $105,270 when he died, how much would Tiny Tim get?
(3)Frank Duryea and his brother Charles formed the Duryea Motor Wago Company and in 1896 produced 13 cars. When Henry Ford set up the first moving assembly line, workers were able to produce a car in 1 hour and 38 minutes. At that rate, how cars could be assembled in thirty-nine hours?
(4)One crisp autumn morning, Ethan and his friend decided to do some inline skating. There are nine boys and ten girls in the group. What is the ratio of the boys to the total number of friends going skating? Epress your answer as a fraction and as a percent.

2007-09-23 17:13:59 · 4 answers · asked by rosemariestewart64 1

The perimeter of a triangle is 51 cm. The measure of the smallest side is 4 less than the middle side. The measure of the longest side is equal to one less than the sum of the other sides. Find the lengths of the sides.


THANK YOU SO MUCH FOR YOUR HELP!

2007-09-23 17:06:01 · 6 answers · asked by DoWHATiDO 3

2007-09-23 17:01:01 · 3 answers · asked by fabulous! 1

Can you guys help me with this ?

find the horizontal and vertical asymptote of this curve

y = (x^2 + 1)/ (2x^2 - 3x -2)

2007-09-23 16:41:43 · 1 answers · asked by sylviaeldon 1

How do you multiply( -1 5/9) x(-2 1/7)
i've tried so many times to get the answer but i always get it wrong

2007-09-23 16:31:10 · 6 answers · asked by Angel 1

Take the derivative with respect to x: r(x) = sin (x)

take the derivative wth respect to x and smplify completely: fx)=x^1/3(4x^3-sqrt(2x))
please explain with positve exponents.

2007-09-23 16:30:05 · 2 answers · asked by fvsdf s 2

2007-09-23 16:27:03 · 2 answers · asked by Robert 1

yeah just wondering..

2007-09-23 16:25:30 · 3 answers · asked by Anonymous

2007-09-23 16:10:00 · 3 answers · asked by abcdefghijk 4

The square measures 90 feet on a side.

2007-09-23 16:08:49 · 2 answers · asked by Jen 4

suppose vector u dot v= w dot v for all v. Is it necessarily true that u=w? justify ur answer.

note: u,w,v are vectors.
dot= dot product

2007-09-23 16:05:48 · 2 answers · asked by blueangel 2

find functions f(x) and g(x) such that the lim f(x) as x approaches a does not exist for every a
the lim g(x) as x approaches a does not exist for every a
but the lim f(x) + g(x) does exist for every a

2007-09-23 15:37:50 · 2 answers · asked by BrokenSentences 2

Preform the indicated operation : Simplify if possible.

1) (x / x^2 + 2x +1) + ( 1 / x^2 + 5x +4)

2) ( x / x^2 +15x +56) - ( 1 / x^2 + 13x + 42)

2007-09-23 15:36:38 · 3 answers · asked by Anonymous

These problems have been driving me crazy for a while and I am still clueless of how to work them out.

Here are the problems:
http://img477.imageshack.us/img477/4169/help1dw1.png

There are only 3.

I'm not expecting nor asking you to directly give me the answer, (I hope you won't!)
I just want to know what steps I would need to make in order to get the answer. Like how exactly do I solve the problem?

2007-09-23 15:10:06 · 6 answers · asked by Anonymous

Can someone validate this problem for me:

1. Write the product in standard form: (5x-9y) (5x+9y)

---Well, i know that you have to square both the first and last terms seperately, so: First term = 5x, Last term = 9y.

(5x-9y) (5x+9y) = (first term)^2 and (last term) ^2.
= (5x)^2 and (-9y)^2
= 25x^2 + 81y^2

......Is my answer correct, if not please tell me where my mistake was. I would really appreciate it.

2007-09-23 15:06:43 · 5 answers · asked by dana c 1