Science & Mathematics - 30 November 2006

its a halloween test

2006-11-30 15:33:26 · 4 answers · asked by froglove98 1 in Mathematics

2006-11-30 15:32:45 · 8 answers · asked by Anonymous in Astronomy & Space

need defintion of an integral

2006-11-30 15:30:37 · 5 answers · asked by SuperStalker 1 in Mathematics

Studies indicate that the biomass for tropical woodlands, thought to be about 35kg per kg/m^2 may in fact be too high and that tropical biomass values vary regionally from about 5-55kg/m^2. Suppose you measure the tropical biomass in 400 randomly selected square meter plots.

A. Approximate the standard deviation of the biomass measurements.

B. What is the probablility that your sample average is within 2 units of the true average tropical biomass?

C. If your sample average is equal to 31.75, what would you conclude about the overestimation that concerns the scientists?

The answers are:

A. Approx. 12.5
B. .9986
C. They are probably correct.

How does one obtain those answers? Can someone explain it to me please?

Thank you,

Sue

2006-11-30 15:30:20 · 2 answers · asked by newbiegranny 5 in Mathematics

x y
0 2
14 287
28 434
42 445
56 318
70 54

write an equation that best fits the scatter plot. (quadratic equation)

2006-11-30 15:28:51 · 2 answers · asked by sonovabeeech 1 in Mathematics

It would just save time right? Or would it be detrimental to cars? Do they salt roads in advance already?

2006-11-30 15:25:52 · 16 answers · asked by Kevin S 3 in Weather

2006-11-30 15:25:33 · 4 answers · asked by Nanners 1 in Biology

f(x)=x(sq)-2x+5

2006-11-30 15:23:49 · 6 answers · asked by Anonymous in Mathematics

Solve the equation:

-16t(sq) - 28t + 250 = 0

2006-11-30 15:22:16 · 4 answers · asked by Anonymous in Mathematics

i have a diffusion & osmosis worksheet and theres 2 questions i really need help on.

-what do you need to do when you fertalize grass?

-what organelle does the amoeba have to deal with the osmotic pressure?

please help ill give you 10 points!

2006-11-30 15:21:59 · 3 answers · asked by :) 2 in Biology

okay okay. im not really asking this because i miss it and i want to start getting high off it again. (i can get other drugs for that and im staying sober since im in the middle of a possible teen preg scare anyways) im being honest when i say im just really curious at to why. i took adderall xr 20 mg once a day for a month or two and then got switched to the regular adderall 20mg (take one as needed). ive had it for about a month and take 20mg a day (it doesnt seem to help me concentrate or anything like the xr did, but the appetite supressant is twice as powerful and thats why i love it). if i get sick (i dont take pills when sick) or forget to take it then i pick a day im going be partying or having fun and take my regular dose and the extra one for a little rush. but lately when i do that i dont feel anything. i rose it up to 70mg one night as a experiment but still nothing. does anyone know whats going on? what r the changes in the body that make it happen? im srsly curious! lol

2006-11-30 15:21:14 · 6 answers · asked by Anonymous in Medicine

this question stumps me if the a/b inside the absolute value box is negative it comes out posotive

2006-11-30 15:19:03 · 5 answers · asked by .::EZ::. 2 in Mathematics

The weights of domestic, adult cats are normally distributed with a mean of 10.42 pounds and a standard deviation of 0.87 pounds.
A cat food manufacturer sells three types of foods for underweight, normal, and overweight cats. The manufacturer considers the bottom 5% of cats underweight and the top 10% overweight. Compute what weight range must be specified for each of the three categories.
Underweight:
Normal:
Overweight:
I am having trouble with this one--it has to be formatted to 8 decimal places using excel. The function for this is NORMINV from the stats menu--but I cannot comeup with any numbers--I keep getting an error message!

2006-11-30 15:18:10 · 3 answers · asked by Moose 2 in Mathematics

Find the roots of the following:

1 - tan(h)[(2pih)/x]^2

One minus the tangent of 'h' times the quantity: Two pi times 'h' divided by 'x' squared.

Thanks for the help.

2006-11-30 15:14:33 · 2 answers · asked by crzygirl342 1 in Mathematics

The cable AB keeps the 8-kg collar A in place on the smooth bar CD. The y axis points upward. Determine the distance s from C to the collar A for which the tension in the cable is 150N.
location of:
B: (0m, 0.5m, 0.15m)
C: (0.4m, 0.3m, 0m)
D: (0.2m, 0m, 0.25m)

collar A's location is unknown. The required is the distance between C and collar A.
For an easier look, go here.
http://img86.imageshack.us/img86/4710/392ij8.jpg

2006-11-30 15:14:25 · 1 answers · asked by Lyrical 2 in Physics

i need the answer to the equation:
2*y^3 + 6*x^2*y - 12*x^2 + 6*y =1

2006-11-30 15:13:46 · 1 answers · asked by jonnyjack 2 in Mathematics

Problem:
Write an equation of a line that passes through A (-1, 3) and (1, -1)

Please Help Me!

2006-11-30 15:13:19 · 4 answers · asked by Anonymous in Mathematics

In human beings, the alleles for for the brown eyes is the dominant (B) over blue eyes(b). Suppose a blue-eyed man marries a brown-eyed woman whose father was blue-eyed. What proportion of their children would you predict will have blue eyes?

2006-11-30 15:13:07 · 8 answers · asked by ♥ sabrina ♥ 2 in Biology

are floods natural disasters plz answer

2006-11-30 15:11:29 · 9 answers · asked by Anonymous in Weather

How do you simplify:
3^0 + 3^1 + 3^2 + ... + 3^(n-1)

For example:
2^0 + 2^1 + 2^2 + ... + 2^n-1 = (2^n) - 1

2006-11-30 15:11:26 · 1 answers · asked by Ms. Curiosity 1 in Mathematics

the flames and avalanche are in the finals. each team hopes to win the best-of-seven games. the probability of the flames' win in any game is 80%. what is the probability that the flames will win the series in exactly 6 games???

2006-11-30 15:11:01 · 4 answers · asked by shishi 1 in Mathematics

2006-11-30 15:10:03 · 15 answers · asked by sandman 1 in Astronomy & Space

How big was it? When did it live and what did it eat? I'm just curous.

2006-11-30 15:09:10 · 5 answers · asked by Link 5 in Zoology

I'm given two pressure levels of the atmosphere and told that the air between them is cooling due to radiation at a rate that would be sufficient to cool the layer 1 degree C / day. I am then asked to figure out how many mm/day of rain must fall if the only heat source to this layer is the net condensation of liquid water.

Note: I'm not looking necessarily for a solution. Just a little guidance. :) Thanks!

2006-11-30 15:07:01 · 1 answers · asked by JoeSchmo5819 4 in Chemistry

2006-11-30 15:06:47 · 16 answers · asked by johanna r 1 in Mathematics

2006-11-30 15:06:31 · 1 answers · asked by Sony 1 in Engineering

1) x(sq)+x-42=0

2) x(sq)+8x-48=0

3) x(sq)+12x+11=0

4) 10x(sq)+3x=1

5) 3x(sq)+7x-31=0

If you can answer any that would be greatly appreciated!

2006-11-30 15:00:13 · 9 answers · asked by Anonymous in Mathematics

2006-11-30 14:59:41 · 8 answers · asked by Marilyn 2 in Mathematics

I can't figure out these problems.

Find the general antiderivative of the following
1. (x^2 + x + 1)/(x)

Find f
2. f'(x)=2x-(3/x^4), x>0, f(1)=3

Thank you

2006-11-30 14:58:07 · 3 answers · asked by Anonymous in Mathematics

does anybody here know the average force, acceleration or speed on a soccer ball during throw-in?

2006-11-30 14:57:38 · 1 answers · asked by Anonymous in Physics