Mathematics - 14 October 2007

This is just a puzzle, I know the answer but just for general amusement or annoyance.

When you take any three digit number, not a reverse of itself (e.g 787).
Reverse it and subtract the smaller of the two from the larger.
(if left with a two digit number a zero must be placed in front of it, e.g 098)
Take the answer to this and its reverse and add them together.

Show why, in anyway you choose, why the answer will always be 1089.

E.G
765
-567
- - -
198
+891
- - -
1089

(A university lecturer did this trick on me and I was annoyed for the next few days trying to work out why.)

2007-10-14 06:37:41 · 1 answers · asked by Enericoy 1

2007-10-14 06:25:21 · 11 answers · asked by Fire R 1

I need help in proving the SAS postulate in geometry. If someone could prove it and help me please?
and no, I'm not trying to make you do my homework. my geometry book just isn't any good.

2007-10-14 06:25:05 · 1 answers · asked by hurricane 3

2007-10-14 06:24:48 · 9 answers · asked by babydivabrat@sbcglobal.net 1

get A

please

2007-10-14 06:22:14 · 3 answers · asked by Janson C 1

Could you guys show the workings

2007-10-14 05:59:32 · 6 answers · asked by Napster 2

a+b=c
Tricky huh?
Good luck figuring this one out!

2007-10-14 05:55:12 · 6 answers · asked by Anonymous

step by step

2007-10-14 05:50:02 · 4 answers · asked by Anonymous

Solve the following system of linear inequalities by graphing
x – y <= 3
x + 2y >= 6
How do i do this

2007-10-14 05:42:28 · 2 answers · asked by Jessica B 1

Please show all the steps, thanks

2007-10-14 05:42:15 · 5 answers · asked by teendeviant 3

please help, urgent!

2007-10-14 05:26:05 · 5 answers · asked by slash_rocks s 2

...f⁡(x) = (x)⁢sin⁡(4⁢x) has a horizontal tangent line at x=a. Answers correct to three decimal places.

2007-10-14 05:12:36 · 2 answers · asked by eclipsegt_01_03 2

2x^2 - x - 3 = 0

2007-10-14 04:58:33 · 11 answers · asked by Horsecraz4eva 2

P(x)=2x^3-5x^2-4x+3

find that complete factorization of P

i want to make sure if i did it right please answer it so i can check my answer with yours to see if i did it right please

2007-10-14 04:55:12 · 2 answers · asked by star baller 360 5

2007-10-14 04:51:36 · 9 answers · asked by Anonymous

2007-10-14 04:46:51 · 8 answers · asked by chelsea b 1

Can you please tell me how to do this problem in STEPS, because when I did it on the calculator I don't understand how it could be the answer that they gave me.
So please help me.

39.8 divided by 0.02

2007-10-14 04:21:44 · 14 answers · asked by ? 2

how do i simplify
√6/√7 x √14/√3

2007-10-14 04:14:14 · 4 answers · asked by sumguy 1

x^-2=4

2007-10-14 03:49:46 · 4 answers · asked by sumguy 1

2007-10-14 03:43:47 · 5 answers · asked by crystal_clear_girl238 1

2007-10-14 03:27:16 · 1 answers · asked by LisaE 1

2007-10-14 02:42:43 · 2 answers · asked by The Fresh Prince 4

2007-10-14 02:40:37 · 8 answers · asked by Dylan Rose 1

2007-10-14 02:18:27 · 5 answers · asked by snickernikki727 1

a resource centre has 4 copies of a particular film for rental over 1 week perod the demand by borrowers per week is a poisson distribution with mean 3
A) find the expected number of copies that will be rented out in a week

2007-10-14 01:39:17 · 2 answers · asked by ice i 1

2007-10-14 01:36:24 · 10 answers · asked by Anonymous

2007-10-14 01:33:04 · 7 answers · asked by Emma S 1

Please HELP!

2007-10-14 01:24:09 · 10 answers · asked by snickernikki727 1

Matrices-calc project please please help?
any form of help is appreciated!
note: i dont know how to make matrices on computer so each of these is a 2 by 2 matrix...just in one set of brackets. numbers before comma are top row, after comma are bottom row

1. Consider matrix M= [2 0 , 0 2] calculate M^n for n= 2, 3, 4, 5, 10, 20, 50. Describe in workds any pattern observed. use pattern to find general expression for matrix M^n in terms of n

2. Consider matrices P=[3 1, 1 3] and S= [4 2, 2 4]
P^2=[3 1, 1 3]^2 =[10 6, 6 10] = 2[5 3, 3 5] ; S^2= same type of thing as P
Calculate P^n and S^n for other values of n and describe any observed patterns

3. Consider [k+1 k-1, k-1 k+1]
steps 1 and 2 contain examples of these matrices for k=1, 2, and 3. consider other values of k and describe any patterns you observe. generalize these results in terms of k and n

4. use technology to investigate what happens when further values of k & n. state scope of limitations of k and n

2007-10-14 00:59:11 · 6 answers · asked by suryakant p 1

Hi There, Can anyone solve this problem? you can also email me your answers. qaviliom@yahoo.com
Any comments is extremely appreciated.
Regards,
Qaviliom.


Why for m greater than 7 we have:

2^m=< LCM(1,2,3,4,...,m)=< e^m

2007-10-14 00:51:01 · 4 answers · asked by Curious 1