Mathematics - 2 October 2007

The identity I'm referring to was 1/2*ln((1+x)/(1-x)), |x|<1

2007-10-02 14:39:56 · 1 answers · asked by Ilaya 2

solve ln(9 + lnx) = -9 for the variable x

the answer I get seems kind of strange

2007-10-02 14:34:53 · 7 answers · asked by Anonymous

a, is the point (11,14,17,18) on the line (1,2,3,4)+t(5,6,7,8)?

b, does the point (4,3,2) lie in the plane (1,2,3)+t(1,1,0)+s(0,1,1)?

2007-10-02 14:33:45 · 2 answers · asked by iznissin 1

2007-10-02 14:29:07 · 2 answers · asked by Anonymous

3ft/s. How rapidly is the area enclosed by the ripple increasing at the end of 10s?

2007-10-02 14:14:56 · 2 answers · asked by Deutschjoe 3

The circumference of a circle and the perimeter of a square are the same.

Which has a bigger area-the circle or the square?

WORK MUST BE SHOWN TO EXPLAIN!

PLZ HELP!!

2007-10-02 14:13:46 · 2 answers · asked by Anonymous

perform the operation. siplify if possible...


(x+1) over (4x+8) - (x^2) over (4x^2-16)

2007-10-02 14:06:51 · 2 answers · asked by arod_69 1

ok, you know when they say

in year 1996 the net income for such and such a family was $43,000 and now in 2007, it has risen to $60,000 (i just made up that statistic)

by how much percent did it raise? questions like those! how do i calculate to figure out that answer? what are the steps? please!!! i'm eager to know!!!!

2007-10-02 14:04:08 · 6 answers · asked by Anonymous

i need help and its ergent this answer is due tomorrow morning at 7:00

2007-10-02 14:03:55 · 13 answers · asked by ash 2

why would you add the opposite if its subtaction

2007-10-02 14:02:49 · 8 answers · asked by Pooh-Bear 2

Okay, so this is a circle equation:

xSquared+ySquared-5x+4y-13=0

I need to split it into two functions.

So, the question is: ... Begin by writing the circle as the union of two functions. Identify the functions that represent the top half and the bottom half of the circle.

Thanks. ♥BeautiifuLChick♥

2007-10-02 13:56:37 · 3 answers · asked by ♥Evee♥ 3

He gave his friends these three clues to see if they could guess how much he had: The coins equaled 1 dollar, He had no more than 100 coins, he had at least one coin. What combination of coins could Fransisco have in his pocket.
I really need some help with this. I don't even know what they're asking. Please help and explain your answer. I need to know how to do it step by step. Thnx so much to ne one that can help I'm desperate

2007-10-02 13:55:14 · 5 answers · asked by Anonymous

I've already proven f(x) is not differentiable at x by letting x assume values greater and less than 6. What I don't know how to find is the forumula for f '.

2007-10-02 13:52:17 · 2 answers · asked by glass_commander 2

"... rug covers half the floor area of a room and leaves a uniform strip of bare floor around the edges." The rug is rectangular. Does that mean that there is a equal amount of space on each side of the rug, making the room rectangular? Its only the "uniform strip" bit that I don't really get.

2007-10-02 13:49:17 · 7 answers · asked by Anonymous

A ball is thrown into the air by a baby alien on a planet in the system of Alpha Centauri with a velocity of 34 ft/s. Its height in feet after t seconds is given by:

y=34t - 22t^2 (t is squared)

A. Find the average velocity for the time period beginning when t=3 and lasting
.01 s:
.005 s:
.002 s:
.001 s:


B. Estimate the instanteneous velocity when t=3.

2007-10-02 13:44:48 · 1 answers · asked by m_mays89 2

ok so i know it seems easy and i think i got the answer
but i just need to double check it with u guys answers
thanks sooo much!


When each works alone Barbara can do a job in 15 hours less time than John. When they work together it takes them 10 hours to complete the job. How long does it take John working alone to do the job?

2007-10-02 13:42:00 · 6 answers · asked by Anonymous

x over x+2 + x-2 over x

2007-10-02 13:38:45 · 5 answers · asked by arod_69 1

i need help simplifying this:

2/5(10x + 25) = -10 - 4(x +3)

first i distributed and got:
2x + 10 = -10 - 4x - 12
i combined like terms -10 & -12.
2x + 10 = -22 -4x
added 22 to each side then subtracted 2 from each side.
32 = -6x
and then i divided by -6.

the soultion i got is 5 1/3 but the answer is supposed to be -4. what did i do wrong?

2007-10-02 13:36:25 · 2 answers · asked by jkl; 4

2/x - 3/2x = 1/3

Solve for x.

Please show how you got the answer. I know it comes to x = 3/2 but I can't figure out how it gets to that answer.

Please explain using the LCD method.

I understand how the other one works but my teacher won't accept the answer if it's not using the LCD method.

HELP PLEASE!

Thank you in Advance!

2007-10-02 13:35:07 · 1 answers · asked by Ruebelle 1

the 4th term is -9
and the 28th term is 9
find the generator, the inital value and an equation
how in the heck do i do this!!!!

2007-10-02 13:27:01 · 2 answers · asked by slhs_classof2010 2

Tickets for the dance cost 20 bucks for a single ticket or 35 bucks for a couple. ticket sales totaled 2280 bucks and 128 people came. how many of each type were sold?

2007-10-02 13:22:20 · 3 answers · asked by Louis C 2

2007-10-02 13:07:37 · 5 answers · asked by Anonymous

Im studying for a test tommorow in geometry. I have it all down pretty well. Except how do I double the size of an angle. only using a compass.

2007-10-02 13:06:50 · 1 answers · asked by Jackal115 5

A die and a coin are tossed. Let A be the event that the die shows a 5 or a 6 and let B be the event that the coin shows heads.

A) Specify the sample space for the experiment

B) Specify the simple events in A, B, A union B, A intersection
B

C) Find the probability of A, B, A union B, A intersection B

D) Are A and B mutually exclusive? Are they independent?

2007-10-02 13:06:39 · 6 answers · asked by Anonymous

I have to compute it using the telescoping sum; I know what the formula is but how would I compute it???

2007-10-02 12:58:18 · 1 answers · asked by Anonymous

One of the rules that won't change the value of a determinant of a matrix is: if we add to each element of one row, k times the corresponding element of another row, where k is ANY number (same statement applies to columns as well)(similar to row reduction, but applies to columns as well). I seem to be changng the value of the determinant by doing this... the first matrix i have(whose determinant is 0) is, 1st row: 0 -1 4, 2nd row: 1 0 -1, 3rd row: 4 1 0. I added -4 times the 2nd column to the first column(k= -4), and get, first row: 4 -1 4 , second row: 1 0 -1 , third row: 0 1 0. If u compute the determinant it is still zero! Now by using the above stated rule again, I add the 3rd column to the 1st column, (this theoretically should not change the value of the determinant, we take k=1), so the new matrix is, 1st row: 8 -1 4, 2nd row: 0 0 -1, 3rd row: 0 1 0. If we now solve for the determinant, we can see that it is 8. Why does this happen? It should still be zero!

2007-10-02 12:55:56 · 1 answers · asked by John 6

2007-10-02 12:54:08 · 1 answers · asked by carla f 1

x=x no soloution, one soloution or many???

2007-10-02 12:54:06 · 4 answers · asked by isis r 1

(a) Is the point (11 14 17 18) on the line (1 2 3 4) + t (5 6 7 8)?
*they are all vertically arrange like this:
(11)
(14)
(17)
(18)

(b) Does the point (4 3 2 ) lie in the plane (1 2 3) + t(1 1 0) + s(0 1 1) ?
*they are also all vertically arrange like this:
(4)
(3)
(2)
Explain your answers.

2007-10-02 12:51:35 · 2 answers · asked by iznissin 1

2007-10-02 12:46:43 · 7 answers · asked by Anonymous