Mathematics - 3 August 2007

its leftmost digit is removed and written again as the rightmost digit. the number thus obtained is twice x. find the decimal representations of all such numbers x

thanks guys

2007-08-03 15:18:48 · 4 answers · asked by Anonymous

x²+2ax=b
work:
(x+a)²-2a=b

This would make sense, we would have to complete the square by mutiplying "2" and then squaring it.
(x+a)²-4a²=b
(x+a)²=4a²+b
x+a=√4a²+b
x+a=2a√b
then..
x=a√b

How would it make sense skiping by mutiplying "2", and replacing it by ² to get -a² instead of just 4a²?
(x+a)²-a²=b

see?

2007-08-03 14:50:34 · 5 answers · asked by Anonymous

In R^n (with respect to the Lebesgue measure) without using the Axiom of Choice? All the examples I've seen, like Vitali's set, are constructed resorting to the Axiom of Choice. If AC is mandatory, then does this mean non measurable sets have a, say, virtual but not actual existence?
Thank you.

2007-08-03 14:47:14 · 1 answers · asked by Steiner 7

x²+2ax=b
work:
(x+a)²-2a=b

This would make sense, we would have to complete the square by mutiplying "2" and then squaring it.
(x+a)²-4a²=b
(x+a)²=4a²+b
x+a=√4a²+b
x+a=2a√b
then..
x=a√b

How would it make sense skiping by mutiplying "2", and replacing it by ² to get -a² instead of just 4a²?
(x+a)²-a²=b

see?

2007-08-03 14:36:09 · 3 answers · asked by Anonymous

find the slope of the line passing through the points (-1,3) and (7,3)

is it 0,1,8 or undefined?

2007-08-03 14:14:57 · 7 answers · asked by busy me 2

I AM IN 7TH GRADE SO PLEASE TRY TO SPEAK NORMALLY, NOT SOPHISTICATED, SO THAT I CAN ACTUALLY UNDERSTAND YOU!! thx1lol

2007-08-03 14:07:45 · 4 answers · asked by superstarr. 1

an employee who produces x units per hour earns an hourly wade of y=0.7x+7 (in dollars) find the hourly wage for an employee who produces 17 units per hour.

2007-08-03 14:02:06 · 11 answers · asked by busy me 2

2007-08-03 14:01:41 · 4 answers · asked by booboobear_619 1

1) 5x-y=5
3x-5y=-63

2) how do i solve for all three variables
a-b+3c=-8
2b-c=15
3a+2c=-7

Also what are the two methosd of solvuing systems of equations algebracially?

2007-08-03 13:54:36 · 4 answers · asked by Anonymous

Work.
3x²-5x-8=0
(x-5/6)²-25/36=8/3
(x-5/6)²=8/3+25/36
...................
96/36+25/36=121/36
right?
If it is possible for me...Then I would do it in a formula, but I have to do the other way cause of my teach.
...............
(x-5/6)²=121/36
x-5/6=+/- 11/6
x=-6/6,16/6
x=-1,6

help, why do I suck at math?
And why must we *2 and square it anyways?
How is this suppose to help us in the real world, everything in quad. equations would always =o, then why would we solve it when we already know the equation ='s "0"?

2007-08-03 13:29:53 · 6 answers · asked by Anonymous

A={-1,0}
{0, 5}

B= {3 0 2}

C={1 6 0}
{-5 0 -3}
{0 4 -1}

D={8}
{9}

1) Name an element in matrix A
2)Name a coulumn matrix
3) Name a row matrix
4) Name the square matrices
5) give the dimensions of matrix B
6) The number 4 in matrix c is in what position?
7) Multiply matrix A times D is the answer [-8 -45}?


please tell me how you get these answers because i have never done matrics and i do not have a book. thank you to anyone who helps

2007-08-03 13:17:34 · 4 answers · asked by Anonymous

Fractions I forgot how to do....it's summer aww

Is it.
8/3*12 so we must have denomenator to "36"
8/36 then we would have to take 8*12???

Or

2 2/3*12 then it would be 2 24/36???

2007-08-03 13:07:08 · 19 answers · asked by Anonymous

Look here at work..shown
EXAMPLE A
x²+2/3x-3=0
(x+1/3)²-1/9=3
(x+1/3)²=28/9
x+1/3=2sqrt7/3
ect....

1) In this equation we don't times "2" in the denomenator of 1/3 in (x+1/3)² why???

EXAMPLE B
x²+1/4x-1/2=0
x²+1/4x=1/2
(x+1/8)²-1/64=1/2
ect...

2)In example B, we times "2" and squared it to get -1/64 why???

3)Why are example A and example B different, with *2 and squaring it and without it?

2007-08-03 13:03:56 · 3 answers · asked by Anonymous

If we had.
3x²-5x+2=0
The rules says that if we do one thing to one side we must to the same thing to the other.
If we would get 3x² to just x², we would have to divide both sides by "3" "Once to one side than the other side" Like a regular equation.
ex.

3x²/3-5x=-2/3
would be.
x²-5x=-2/3
But to really solve it we must divide "5" by "3" too, it makes no sense.

How is that we must take -5 and divide it by 3???
Why isn't it playing by the rules?

2007-08-03 12:55:17 · 10 answers · asked by Anonymous

2 x (3-(4/2 x 5 -3) - (-5) + 6 squared=

2007-08-03 12:47:54 · 6 answers · asked by q 2

If x is a positive integer, which of the following CANNOT be the units digit of 7^x?

A. 1
B. 3
C. 5
D. 7
E. 9

(what is units digit?)

2007-08-03 12:14:39 · 9 answers · asked by purestarzz88 1

probably yet another easy one, but once again i'm stuck.

take the integral from 1-->5 of
dx/(3x+1)

ok, i know you're supposed to use the substitution rule again and i'm saying u=3x+1. and then plugging it in, changing the upper/lower bounds, but it's not working...again. help?

2007-08-03 12:14:28 · 6 answers · asked by Anonymous

always my luck, i guess.

take the integral from 0-->Pi/4 of sin(2t) dt

i know you're supposed to use the substitution rule and i'm saying u=2t. and plugging it in and then finding new upper/lower bounds, but i'm not getting a right answer. help?

2007-08-03 12:12:41 · 3 answers · asked by Anonymous

please explain

2007-08-03 11:44:05 · 6 answers · asked by plplz 1

Find sin 2x if sinx = 1/5 and x is between 0 and 90 degrees

How would you go about solving this? The book says to draw a diagram, but i cant seem to be able to. I got as far as simplifying it to

sin2x = 2 sin1/5 cos1/5

Any help would be appreciated!!

2007-08-03 11:41:24 · 9 answers · asked by A helpful hand =) 2

The equation is T= (9*h*Log(Rb/Ra) / 8*pi^2*N^2*r^2* (p-po))+ 2*(ta+td)/3 I wish to transpose and solve for N in terms of all the other variables.

2007-08-03 11:40:58 · 3 answers · asked by Downeasta 2

I am typing up notes for physics equations. I want to be able to use these symbols with Word. Some of the symbols I am looking for are: lambda, alpha, gamma etc. Any help would be greatly appreciated. I am using windows XP.

2007-08-03 11:36:05 · 8 answers · asked by Ed H 1

On a Map, 1 inch represents 20 miles. The distance between 2 towns is 6 1/5 inches. How many miles are actually between the two towns?


65 miles
84 miles
124 miles
138 miles
145 miles

2007-08-03 11:32:48 · 13 answers · asked by elearner 1

solve the problem. show work please


1.a farmer estimates it will cost $7 to maintain the trees in his orchard. If he has 47 trees in each row and there are 173 rows, find his maintainace cost for the entire orchard


2.sue has a 16 foot piece of shelving lumber. She needs to make 4 shelves. each one will be 3 3/4 long. find the length of the piece of lumber that sure has left after she hs cut all of the shelves?

3. davids dad bought a washing machine that cost $479 if he paid $95 down and arranged to pay off the balance in 8 equal monthly payments what is the amount of each payment?


THANK YOU SO MUCH!

2007-08-03 11:11:41 · 7 answers · asked by kacieesmth 2

2007-08-03 11:08:58 · 8 answers · asked by Anonymous

2007-08-03 11:05:44 · 4 answers · asked by mizz.nisha 1

Really now...what is this?

Find the value of x: (2x) / 7 = (x - 1) / 3


And could i get some help with these?

Given Triangle RST is similar to Triangle DEF. If m Ang E = 38, m Ang R = 43, and m Ang T = 7x + 8, then x = ?



In Figure 8, if GI = 3, IH = 8, JK = 10, what is JI (if it is longer than IK)?



What is the volume of a right cone with radius 3 and height 4?


AND! For those people that are super good at math. Any suggestions to help me understand and more importantly MEMORIZE my math?


figure 8:::
http://i20.photobucket.com/albums/b231/Catalainya/geom_365.c.jpg

2007-08-03 10:42:48 · 4 answers · asked by ChellBaby 1

2007-08-03 10:41:53 · 18 answers · asked by KK 2

2007-08-03 10:32:23 · 6 answers · asked by Anonymous

-4+3+
5+9=
8+(-10)=
-15 -7=
12+(-7)=
3+(-8)=
(-10)+(-14)=
2+(-11)=
6-(-18)=
7+(-3)=
6+8=
9+(-13)=
-4+__=3
___-(8)=-18
-15+__=-11
___-(-6)=10
20+(-7)=__
16+___=12

2007-08-03 09:53:38 · 3 answers · asked by ♥OFFICIALLYMrs-JONES♥ 2