Mathematics - 31 October 2007

2007-10-31 23:57:14 · 4 answers · asked by Anonymous

find the limit when x approaches to infinity ?
(ln (2 + e^(3x))) / (in ( 1 + e ^x))

2007-10-31 23:50:28 · 2 answers · asked by dr-Fouad 2

2007-10-31 23:49:23 · 7 answers · asked by hellllloooooooo 1

2007-10-31 23:44:35 · 30 answers · asked by Anonymous

2 / (3x+1) = 1 / x - 6x / (3x+1)

2007-10-31 23:40:03 · 4 answers · asked by gr8ventura 1

2007-10-31 23:14:18 · 4 answers · asked by hellllloooooooo 1

2007-10-31 22:57:34 · 9 answers · asked by hellllloooooooo 1

A tower 27.5 meters tall makes an angle of 126 degrees with the inclined road on which it is located. Determine the angle subtended by the tower at a point down the road 35 meters from its foot.

2007-10-31 22:48:54 · 2 answers · asked by delixir_21 1

Please can you give the answer to this sum then explain how you got the answer so I can learn myself, thank you.

7.1 x 10-3 (the minus sign should be higher up but the computer did not have a button for this!)

2007-10-31 21:51:13 · 7 answers · asked by Michele 3

First to answer correctly and in details gets best answer

2007-10-31 21:49:51 · 2 answers · asked by Drag DarkFire 2

2007-10-31 21:49:08 · 1 answers · asked by murali k 1

x - y + 2z = 4
2x - 2y + 4z = 7
3x - 3y + 6z = 11

placing them in a matrix
1 -1 2 4
2 -2 4 7
3 -3 6 11

then proceeding with row-echelon form I got

1 -1 2 4
0 0 0 -1
0 0 0 -1

By analyzing the equations for the planes, I know that all the planes are parallel but are in different places.

What I'm having a problem with is that when I plug my equations into a program, I get:
1 -1 2 4
0 0 0 -1
0 0 0 0

What did I do wrong?

2007-10-31 21:23:45 · 2 answers · asked by fye 1

I understand simple factorials, but not factorial quotients where you have a numerator and denominator that don't simplify. I don't know what to do with expressions like 1 * 3 * 5 * 7 ..... (2n - 1).

There are two alternating series I'm stuck on. I am supposed to determine the convergence or divergence of the series using the Alternating Series Test: find where an is > 0; the limit of an as n approaches infinity must = 0; and you must show that a(n + 1) [the next nth term after an] is less than an for all values of n. We've been using derivatives to show a function is decreasing so I don't understand these mathematical induction style proofs.

1) Summation, from 1 to infinity:
[(-1)^(n + 1) * n!]/[1 * 3 * 5 . . . (2n - 1)]

2) Summation, from 1 to infinity :
[(-1)^(n + 1) * 1 * 3 * 5 . . . (2n - 1)]/[1 * 4 * 7 * . . . (3n - 2)]

If any math genius happens to see this, I would really be happy to have some help. Thanks. :)

2007-10-31 20:44:41 · 3 answers · asked by Anonymous

5m2=16-3?
(2 means squared)

2007-10-31 20:29:19 · 6 answers · asked by Anonymous

Let
f: A-->B
g: B-->C

Prove: If g o f is onto, then g is onto.

I appreciate any help! Thanks!

2007-10-31 20:09:42 · 1 answers · asked by Anonymous

In Australia im allowed 2 graphic calculators for exams with notes (only because its the hardest maths and physics and chemistry). Does anyone know how to get notes and formulas on a Texas TI-83 or 84? Thanks heaps.

2007-10-31 20:03:14 · 2 answers · asked by Anonymous

Find the exact value of tan 255°.

a. (3 + sqrt of 3)/(3 - sqrt of 3)
b.(1+ sqrt of 3)/(1 - sqrt of 3)
c. 3.73205
d. (3 - sqrt of 3)/(3 + sqrt of 3)

2007-10-31 19:44:16 · 5 answers · asked by sillyboys_trucksare4girls 2

For the function g in your estimate f(x) is O(g), ues a simple function g of smallest order.

a. (n^3 + (n^2)log n)((log n) + 1) + ((17 log n) + 19)(n^3 + 2)

b. (n^n + n(2^n) + 5^n)(n! + 5^n)

Any help you can give is greatly appreciated, and I'll vote best answer.

2007-10-31 19:25:47 · 2 answers · asked by Jean-Francois 5

Can i say: since any number divided by itself is 1 then zero divided by zero the ans is 1?

2007-10-31 19:10:46 · 29 answers · asked by Omar 1

draw an isosceles triangle. from the midpt. of each leg, draw a perpendicular segment to the base. prove that these segments are congruent.
how do you do a two column proof?! help quick! thanks.

2007-10-31 18:26:00 · 2 answers · asked by janetツ 3

that is (x+y) to the power of 5

2007-10-31 18:11:07 · 9 answers · asked by Josh M 1

This is supposed to be 5th grade?

Anna's farm picked a total of 310 pumpkins. Anna separated the pumpkins into small and large. She sold the small pumpkins for $3 each and the large ones for $9 each. She sold all of the pumpkins for total sales of $1,950. How many small and large pumpkins did Anna originally pick?

2007-10-31 18:05:48 · 5 answers · asked by gauchogirl 5

2007-10-31 18:01:25 · 8 answers · asked by Wallid K 1

2007-10-31 17:55:04 · 3 answers · asked by gr8ventura 1

solve for t.

i reeeally don't understand this factoring stuff -_-

2007-10-31 17:47:53 · 5 answers · asked by biatch 2

help me to find the right answer--
for the quadratic equattion--
x(race to the power 2)+7x+12
find me one of the roots of this equation from the choices
(A)7 (B)4 (c)-3 (D)3

2007-10-31 17:38:19 · 4 answers · asked by Moni P 3

Pulsar also manufactures a series of 19-in color television sets. The quantity x of these sets demanded each week is related to the wholesale unit price p by the following function.
p = -0.059x + 250 (0 x 12000)
The weekly total cost incurred by Pulsar for producing x sets is represented by the following function.
C(x) = (0.000008)x3 - 0.01x2 + 470x + 73000
(a) Find the revenue function R.
R(x) =
Find the profit function P.
P(x) =

(b) Find the marginal cost function C'.
C '(x) =
Find the marginal revenue function R'.
R '(x) =
Find the marginal profit function P'.
P '(x) =

(c) Compute the following values. (Round your answers to 2 decimal places.)
C '(2900) =
R '(2900) =
P '(2900) =

2007-10-31 17:31:49 · 1 answers · asked by Anonymous

can you help me find the points on the surface x^2 * y^2 * z = 1 that are closest to the origin?

2007-10-31 17:25:26 · 2 answers · asked by Anonymous

conducted an experiment with:
independent variable - presence of a sign (nominal value)
dependent variable - instances of illegal parking (nominal value)

we had readings over 3 weeks (pre-test week without stimuli, treament week with stimuli, post-test without stimuli) at 2 carparks (one control, one treatment)

which statistical test should I use?
if chi-square, which numbers should I compare (week? carpark? illegal? legal?)

2007-10-31 17:24:19 · 3 answers · asked by Anonymous

ok im basically stuck in al laspects of algebra because i dont no how to factor. if i no what form it is and i no the steps involed i cna do it. obviously , but sometimes the forms i cant tell the difference. for instance. 5x^2+5x-30= 5(x-2)(x+3) according to the book. isnt this equation in the quadratic formula form. and that form states u multiple a x c and that answer adds to get b. IE 5 x 30 = 120 and add to get 5. but isnce the answer is -2, 3 . i dont get it. can someone please help me understand this.

2007-10-31 17:20:54 · 3 answers · asked by Anonymous