Mathematics - 31 July 2007

Find the sum of the series
infinity sigma n=1 1/ [n(n+2)(n+4)]
I took the integral but I just could not get the answer.
The answer is 11/96.


What is the easiest way to prove that
(e^2x-1)/(e^2x+1)= x -1/3*x^3 + 2/15*x^5....

I had tried to take the partial fraction but it seems tat it just make the question more complicated because I have to do a lot of expansion. Is there any other method?

2007-07-31 22:42:08 · 1 answers · asked by monkey 2

1.In the work force of a large company, 70% of the employees are high school graduates, 8% are supervisors, and 5% are both supervisors and high school graduates. From this information, answer these questions. (a) if the employee is high-school graduates, what is the probability he is a supervisors? (b) if the employee is not a high school graduate, what is the probability he is a supervisor?
2.A town has 2 fire engines operating independently. The probability that a specific engine is available when needed is 0.96.
a.What is the probability that neither is available when needed?
b.What is the probability that a fire engine is available when needed?
3.Two cards are drawn from a well shuffled ordinary deck of 52 cards. Find the probability that they are both aces if the first card is a) replaced , b) not replaced
4.Two cards are drawn from a well shuffled ordinary deck of 52 cards. Find the probability that they are both aces if the first card is a) replaced , b) not replaced.

2007-07-31 22:21:35 · 4 answers · asked by Anonymous

HOW to find out by reading question if it is EQUAL variance s or UNEQUAL variances....I dont understand.
Please I need easy explanation with example??? Exam is coming soon....

2007-07-31 21:53:34 · 3 answers · asked by Secret 2

here is the sum.

there are two tap,a and b,tap a can fill up a bucket in 5 minutes and tap b can fill up the same buckets in 6 minutes,how long does it take for the two taps to fill up the bucket together.

2007-07-31 21:39:33 · 11 answers · asked by hpz ftw 4

2007-07-31 20:56:59 · 7 answers · asked by singapore r 1

complex number question

2007-07-31 20:56:21 · 2 answers · asked by uncletimrob 2

a 16/36
b 4/36
c 5/36
d 18/36

2007-07-31 20:10:37 · 11 answers · asked by Anonymous

it is related to set theory.

2007-07-31 19:56:02 · 4 answers · asked by ankur_rocks2 1

I know that their is strings like 0123456789, 333, 444, and so on.. but how are you supposed to know which position it is.. like a number like 102793.. how would you find that position?
Best answer = 10 points

2007-07-31 19:51:50 · 3 answers · asked by Anonymous

5x^2+7x+1=0

2007-07-31 19:44:23 · 5 answers · asked by Anonymous

For example, I used Maple to find the roots of:
(r^4 + 5r^2 +4=0). How do you find the roots by hand? thanks

2007-07-31 19:14:06 · 5 answers · asked by thatguy2007 2

I wanna see a lot of digits.. ( like thousands millions or billions.. it doesn't matter )
best answer = 10 points

2007-07-31 19:05:24 · 2 answers · asked by Anonymous

A unit of packed cells (approximately 240mL) is to be administered over 4 hrs. The blood tubing has a drop factor of 10gtt/mL. Calculate the drip rate in gtt/min in order to administer the blood over 4hr. ____gtt/min

2007-07-31 18:56:29 · 4 answers · asked by Star 1

2007-07-31 18:03:44 · 10 answers · asked by Ryan Koh 1

If you are rolling a pair of dice, which of the following sums has a 1/9 probability of being rolled?

A.2
B.3
C.4
D.5
E.6


Please Help.

2007-07-31 17:39:50 · 6 answers · asked by Anonymous

in word form

2007-07-31 17:34:24 · 2 answers · asked by Anonymous

2007-07-31 16:56:06 · 3 answers · asked by Kim S 1

please show me how to do it

2007-07-31 16:52:00 · 2 answers · asked by vennysweetgirl21 3

Solve for x:

(x-1)^2 =2x^2 -x -11

(If there is more than one solution, separate them with commas.)

2007-07-31 16:08:03 · 3 answers · asked by Anonymous

Can you please Show me Steps for this. I need to Know how to do it.

2007-07-31 16:04:08 · 2 answers · asked by Anonymous

-18.72/3.6
I need the answer done the long division way, plz show work!! Thanks, and the best answer will recieve 10 pts!!! =)

2007-07-31 15:40:55 · 3 answers · asked by lodiva1bw 3

(3ab) (a to the power of 2 b) (5b to the power of 2)

2007-07-31 15:30:10 · 5 answers · asked by mikeyyyyyyyyyyyyyyyyyyyyyyyyyyyy 1

I need good explanations! Here they are
31+2(24-35)
29-3(7-9)

2007-07-31 15:30:03 · 7 answers · asked by Anonymous

whats the answa

2007-07-31 15:27:21 · 8 answers · asked by Ladii D- Rock 1

A. 32
B.79
C.480
D.1185

2007-07-31 15:15:36 · 15 answers · asked by sdp 1

2007-07-31 15:08:22 · 6 answers · asked by dltbillings1 1

let k be a scalar. Use the definition of the cross product to explain why ka x b= a x kb = k (a+b) .
this is where a and b are vectors.

2007-07-31 15:06:51 · 3 answers · asked by moooona1987 2

Determine which are rational and which are irrational.

1. The square root of negative 49

2. -0.733
and. __
3. 6.527

Thanks!! =)
p.s. :The repeating sign on question 3 is supposed to be over the 2 and the 7.

2007-07-31 14:51:15 · 14 answers · asked by lodiva1bw 3

Proving Identities:

tan x(sin x + cot x cos x) = sec x

please answer!

2007-07-31 14:29:33 · 5 answers · asked by mwali02 2

do i need a graphing calculator for 8th grade and is the ti-84 plus silver ed. the best for 8th grade

2007-07-31 14:13:38 · 8 answers · asked by kepster93 3