Mathematics - 26 September 2006

2006-09-26 06:14:22 · 9 answers · asked by Swati a 1

hey guys i know this is super easy but i havent done in such a long time i forgot
-2 1/2 converted to an improper fraction is it -5/2?

2006-09-26 06:11:13 · 10 answers · asked by Fries 4

2006-09-26 05:39:39 · 7 answers · asked by praveena k 1

Method 1:
Now cos²x = (cosx)², and integrating normally I get (-cos³x)/(3sinx).

Method 2:
Using identities:
cos²x + sin²x = 1 and
cos²x - sin²x = cos(2x) we get
2cos²x = 1 + cos (2x) and
cos²x = 1/2 (1+cos(2x))
which upon integrating gives x/2 - (sin(2x))/4.

These two answers are clearly different, but why?
I think I must have made some silly error the first way, but I don't know where.

2006-09-26 05:29:00 · 3 answers · asked by Anonymous

9^x = 3^x+3

remember without using logs please

2006-09-26 05:26:51 · 3 answers · asked by Jamie B 1

3 10/11+2 1/101 choose 4 or 5 or 6 or 7

5 2/47 - 2 1/35 choose 2 or 3 or 4 or 5

6 17/19 x 7 3/290 choose 42 or 49 or 63 or 213

2006-09-26 05:08:17 · 5 answers · asked by buzzybeans 1

2006-09-26 04:51:22 · 7 answers · asked by yofra2pasquale 1

The lethal dose of fluoride is estimated to be 75 mg F- per kilogram body mass for humans. How many tubes of toothpaste would a 70kg adult have to consume to reach this level? A typical tube holds x g of toothpaste containing 0.24% w/w of sodium flouride

2006-09-26 04:48:16 · 8 answers · asked by Anonymous

2006-09-26 04:32:53 · 0 answers · asked by donnie r 2

2006-09-26 04:19:33 · 2 answers · asked by donnie r 2

2006-09-26 04:17:19 · 11 answers · asked by warren t 1

let G be the Abelian group.
Prove that G is abelian group iff (ab)^2 = a^2*b^2, where a,b belongs to G.

2006-09-26 03:55:01 · 5 answers · asked by David F 2

x'y'+ xy'z + xyz'

The answer is supposed to have 3 terms and 7 literals.

2006-09-26 03:48:44 · 1 answers · asked by Sean H 2

So if enough people speculate where Bin Laden is maybe he can be found.

I think he is still in the mountains of Afganistan with a Taliban militia.

What is your opinion?

2006-09-26 03:41:17 · 4 answers · asked by Anonymous

Solve this equation please

2006-09-26 03:34:35 · 6 answers · asked by Social animal 1

I have a general idea how it works, but sure would like some imput. Go to this site--it's the magic gopher.
http://www.learnenglish.org.uk/games/magic-gopher-central.swf

2006-09-26 03:17:28 · 8 answers · asked by clear_skyzz 2

a.10 b.9 c.6 d.13

2006-09-26 03:15:24 · 4 answers · asked by Tony R 1

2006-09-26 03:12:34 · 29 answers · asked by aaroncarm 1

Can you give a reason that justifies the following equation:

(a/b)/(c/d) = a/b * d/c

* is times

The equation you see is supposed to be a fraction, but I can only put it on one line with the keyboard.

Can you give a reason to justifies this equation? Do it step by step. Write out reasons for each step.
Thank you!

2006-09-26 03:06:32 · 13 answers · asked by Anonymous

6x cubed=5x-7

2006-09-26 02:58:29 · 10 answers · asked by alyssa g 1

Using the six basic laws of arithmetic (associative, commutative, distributive) one at a time, explain why each real number of the following is true:

(a) for all real numbers x, y, z, and w, (x+y) + (z+w) = (w+x) + (z+y)

(b) for all real numbers x and y, (x+1) 6 + y * (x+1) = (y+6) * ( x+1)

(c) (x+4) * 6 + y * x + (x+4) + 4 * y = (x+4) * (y+7) for all x and y

(d) (x*y + v*x) + (v*y + x^2) = (x+y) * (x+y) for all x, y, and v

(e) for all real numbers x, y, a, & b, (x+y)(a+b) = xa + xb + ya + yb


Where the *, is times (multiplication)
If someone could write these out and explain why they are true, it would be greatly appreciated!

2006-09-26 02:54:52 · 2 answers · asked by Anonymous

Two mathematicians were walking down the street. They had not seen each other for a while, One asks the other.
" Say, how are your three kids? How old are they now?"
The other mathematicain answers.
"The product of their ages is 72. The sum of their ages is..."
He points to a number on a nearby street sign.
The first mathematician answers.
"That is not enough information for me to solve the problem!"
To which the first replies.
"You're right...my youngest daughter likes strawberry shortcake."

How old are the 3 children?

2006-09-26 02:45:06 · 6 answers · asked by runningman022003 7

2006-09-26 01:42:55 · 17 answers · asked by david d 1

A statistician and a mathematician saw a car number and couldn't recall it later.
But the former did remember that the first two digits were identical just as the last two digits too were repetitive. The mathematician could recall that he had noted the number to be a whole square. And then it took him seconds to work out the car number without any doubt whatsoever.
You are the mathematician - please show how to work out.

2006-09-26 01:09:01 · 3 answers · asked by small 7

For example the rule for divisibility by 9 is that if the sum of the digits of a number is divisible by 9, then the number itself is divisible by 9.

2006-09-26 00:42:29 · 7 answers · asked by small 7

Consider the equation 15x + 14y = 7. Find the largest four-digit intyeger x for which there is an integer y so that the pair (x, y) is a solution.

2006-09-26 00:21:19 · 6 answers · asked by Sasha 2