Mathematics - 23 June 2007

ok, i did this integral and it's not letting me put all of my work in here because it's too many characters but here's the integral and then my answer. If someone could see if they get the same thing, that would be great....

int (2x^2 + 5)/((x^2 + 1)(x^2 + 4))

answer i got: (1/(x^2 + 1)) + (1/(x^2 + 4))

2007-06-23 11:14:34 · 2 answers · asked by Anonymous

I have no idea of this concept in statistics.

All I know is that some samples of a population (say, 50 students in a school, 70 sailors on the Kitty Hawk, or 100 members on a web site) are biased and some (a particular group of people, like skaters, gamers, girls that have gone out with many guys, etc.) are not.

But I do not understand anything about it at all. What is bias, in statistics?

2007-06-23 10:54:19 · 4 answers · asked by Sean 3

the picture looks like a rectangle connected to a semicircle. the width of the rectangle is called r and the radius of the semicircle is called r also.

2007-06-23 10:31:55 · 4 answers · asked by chris 1

A rocket accelerates by burning its onboard fuel, so its mass decreases with time. Suppose the initial mass of the rocket at liftoff (including its fuel) is m, the fuel is consumed at rate r, and the exhaust gases are ejected with constant velocity ve (relative to the rocket). A model for the velocity of the rocket at time t is given by the equation below where g is the acceleration due to gravity and t is not too large.

v(t)=-gt-ve[(m-rt)/m]

If g = 9.8 m/s2, m = 30000 kg, r = 135 kg/s, and ve = 3000 m/s, find the height of the rocket one minute after liftoff.


((i don't even know where to start....))

2007-06-23 10:22:59 · 2 answers · asked by Anonymous

int (e^-theta)*cos(2theta)

?

2007-06-23 10:20:52 · 3 answers · asked by Anonymous

int arcsin(x)

2007-06-23 10:17:39 · 4 answers · asked by Anonymous

Ex: DEG CBE

Acronym of 3 with the alphabet, how many possible combinations?

Equation for this?

2007-06-23 10:09:36 · 8 answers · asked by derekyo 1

Please pick A or B and explain your answer please.
A. I support the idea of a 4th Dimension because…
B. I do not support the idea of a 4th Dimension because…

2007-06-23 10:00:21 · 9 answers · asked by Anonymous

A conical icicle metls at a rate of 1.2 cm^3/h. At 10:00 A.M, the icicle is 25 cm long and 4 cm in diameter at its widest point. THe icicle keeps the same proportions as it melts. Determine the rate at which its length is decreasing at 10:00 A.M.

2007-06-23 09:59:00 · 2 answers · asked by Anonymous

2007-06-23 09:52:23 · 15 answers · asked by Anonymous

im having a blonde moment(no offense blondes). i need to know how tall that is in feet.

2007-06-23 09:50:32 · 8 answers · asked by Andrea3000 2

Find the area of the largest isosceles triangle having a perimeter of 18 meters.

2007-06-23 09:38:32 · 3 answers · asked by Andrew J 1

2007-06-23 09:17:00 · 15 answers · asked by Anonymous

I don't remember how to apply natural LOG rules.

2007-06-23 09:16:45 · 8 answers · asked by ? 3

(7u5x6)(-4u5)

-28u10x6
-28u10
-28u25x6

THE 5, 6, AND 5 ARE EXPONENTS.
I don't want the answer. I just want to know if you multiply the exponents 5 and 5 or add them?
like, would the answer be -28u25x6?
(the 2,5, and 6 in that answer are exponents, it just doesn't make them small on the computer)

2007-06-23 09:15:24 · 4 answers · asked by Skyler 2

by trigonometric substitution method

2007-06-23 09:04:36 · 4 answers · asked by aoc10010001100 2

Explain your answer in 4 complete sentences so a student would easily be able to follow your directions.

2007-06-23 09:02:01 · 8 answers · asked by lindasalicea 1

If sam could do a job in 4 days that Lisa can do in 6 days, and Tom could do in 2 days, how long would the job take if Sam, Lisa, and Tom were to complete it together.

and you can explain how? Thanks.

2007-06-23 08:59:22 · 7 answers · asked by Anonymous

A piece of wire 16 inches long is cut into two pieces. One piece is bent to form a square and the other is bent to form a circle. Where should the cut be made in order that the sum of the areas of the square and circle is a minimum? A maximum? (Allow the possibility of no cut)

2007-06-23 08:39:22 · 5 answers · asked by Anonymous

I have a Ducati Motorcycle and the owners mannual call for this, but need to know what it means in terms of US non-metric...thanks

2007-06-23 08:33:48 · 2 answers · asked by Mike C 1

If not what is ?

2007-06-23 08:25:11 · 16 answers · asked by nicole m 1

1.
http://i6.photobucket.com/albums/y250/starbase176/hw2.jpg

2. Simplify
5/x + 4/x^2 - 3/x^3

3. Solve for a
4a + 7 - 3b=23

4. Simplify
p^-4x^2/x^-7 - 4x^9/p^4 + 6x^14/p^4x^5

5. Find the least common multiple of
4a^2c and 14abc^5

2007-06-23 08:19:02 · 2 answers · asked by Meda 2

(2/3) to the 4th power.

So I know you have to go 2X4X4X4X4 = 512 I believe
3X4X4X4X4 = 768 I think

What is the easiest way to reduce an equation thingy? I got it down to 128/197 but that was wrong.

2007-06-23 08:10:08 · 10 answers · asked by Anonymous

The outside surfaces of a cube is painted blue.
It is 6 by 6 by 6.
The cube is cut into 27 congruent cubes.
A)Calculate the surface area of the painted surface of the small cubes.
B)Calculate the surface area of the unpainted surface of the small cubes.

2007-06-23 07:50:16 · 14 answers · asked by The Singing Light 2

1-4x=9-2x....

I keep getting stuck. Please help.

2007-06-23 07:42:11 · 6 answers · asked by Kelli S 1

Solve the following equation for b: F=1/3h(a+b)

2007-06-23 07:07:58 · 5 answers · asked by What's up people!! 1

Find the sum of the first 200 positive integers

2007-06-23 06:42:49 · 7 answers · asked by Dani A 2

We define the sequence a recursively by setting a_1 = 10 and a_(i+1) = a_i + 4 for all i>= 1. (This is the same sequence that appeared in the previous question.) This sequence turns out to be arithmetic. Give the explicit description of the sequence

2007-06-23 06:29:27 · 2 answers · asked by Dani 1

I have to turn this homework problem in by Monday! Please help! Hurry!

2007-06-23 06:11:32 · 5 answers · asked by Scythian1950 7

can you prove that f(x) must be x^n +- 1
or give any other info about f(x)

2007-06-23 05:19:33 · 7 answers · asked by jitin 2