Science & Mathematics - 18 December 2006

2006-12-18 08:37:07 · 4 answers · asked by khaled e 1 in Physics

i have to get this done before christmas which really sucks. this is meant to be my holiday!!

2006-12-18 08:36:11 · 4 answers · asked by shanoodle123 1 in Earth Sciences & Geology

I need help on the following proof(If both pairs of opposite angles of a quadrilateral are congruent, then the quadralateral is a parallelogram) . If you could put in in a two column please do but if not then just list the reasons along with the statement

2006-12-18 08:36:00 · 4 answers · asked by Sunglass 1 in Mathematics

2006-12-18 08:35:45 · 2 answers · asked by Anonymous in Mathematics

2006-12-18 08:34:10 · 11 answers · asked by Anonymous in Mathematics

I always see so many homework questions posted here. I could maybe understand asking for hints, but everyone just wants the exact answers. How do you expect to learn anything if you don't think for yourselves? Most of these questions only require a little tiny bit of effort to answer. In the long run you'll feel good about yourselves if you can do your own work.

2006-12-18 08:33:37 · 8 answers · asked by Link 5 in Physics

There is any mathematical model that has show to be better to do forecasting in the area of economic, financial, management, operations or marketing??? I was trying to do a forecast of a selling variable, and a try a lot of models. But the one that has better performanced was to cut the variable to eliminated the stationarity and then to do a moving average in every segment. A wasn´t exciting with this results because was soo simple. Then a compared this results with a model of other person and a lose, but the different was soo little that i'm not sure if that different was statistical significance.

2006-12-18 08:33:13 · 2 answers · asked by Ozzie V 1 in Mathematics

I know that the intersection of closed sets is closed, but does the intersection of sets with probability one have probability one? (I guess not, because the sigma-algebra is not closed under uncountable intersection, so the probability is not even necessarily defined.)

(Of course, by sets, I mean subsets of R, and by the probability of a set S, I mean P(X is in S).)

2006-12-18 08:31:42 · 3 answers · asked by ted 3 in Mathematics

Ted just bought a new car for $22,500. Suppose the value of the car decreases by 15% each year.

Write a recursive formula for calculating the value of the car after n years. N being the variable.

What will the value be after five years?

After how many years will it be worth less than $5,000.


Thank you SOOOOOOOOOOOOOOOO much it is greatly appreciated.

2006-12-18 08:31:02 · 6 answers · asked by Brandon F 1 in Mathematics

3 = |x| + 9...


can you help solve this math problem! im confused. is it -6, -12, no solution? ahh im confused!!

2006-12-18 08:29:54 · 17 answers · asked by Anonymous in Mathematics

2006-12-18 08:29:04 · 4 answers · asked by lizzytheders 1 in Biology

Lana is recovering from surgery. She takes a pill containing 250 mg of pain medicine every six hours. After six hours, 40% of the medicine in her body REMAINS.

How much medicine will be in her body 24 hours after she takes the FIRST pill?



How much medicine will be in her body in the long run?



THANK YOU FOR YOUR HELP. IT IS VERY MUCH APPRECIATED.....

2006-12-18 08:26:15 · 6 answers · asked by Brandon F 1 in Mathematics

solve using logarithms

x^4=8

2006-12-18 08:26:14 · 5 answers · asked by rapfan2004 2 in Mathematics

help wiht theses as well plese
Ag2S+KCN ---> KAg(CN)2+K2S

2006-12-18 08:23:22 · 2 answers · asked by cheese 1 in Chemistry

1, 2, 5, 10, 21

do you guys see a pattern here? if so, what is it?

2006-12-18 08:23:09 · 5 answers · asked by Anonymous in Mathematics

2006-12-18 08:22:37 · 8 answers · asked by evie. 1 in Chemistry

Use an appropriate method to solve each system of equations

-4x - 3y= -7
6x+2y= -17

this whole equation has one of these on the left side {

2006-12-18 08:21:39 · 12 answers · asked by Brandon F 1 in Mathematics

Use an appropriate method to solve each system of equations

y=1/4x + 10
3x-2y=0

this whole equation has one of these on the left side {

2006-12-18 08:19:51 · 7 answers · asked by Brandon F 1 in Mathematics

A foundry ships 20 engine blocks of which 5 are defective. A purchaser slects 3 blocks at random off the truck. the shipment will be accepted if no flaws are found. What is the probability the shipment is accepted?

2006-12-18 08:19:01 · 2 answers · asked by College girl 2 in Mathematics

2006-12-18 08:17:54 · 10 answers · asked by seabass 1 in Earth Sciences & Geology

There is a way to do this. Something to do with 90 degree angles and the distance you do it in... What is a simple and direct way to figuring this out? The structure in question in well over 50m, however, I would like to get a more precise number...

2006-12-18 08:15:33 · 9 answers · asked by Anonymous in Mathematics

2006-12-18 08:11:50 · 5 answers · asked by jesse 2 in Earth Sciences & Geology

Can anyone solve it - and how did you come up with the solution? This is beginning to drive me crazy! What is the best way to go about solving these?

2006-12-18 08:11:07 · 10 answers · asked by Frannie_kins 1 in Mathematics

Is deep water less dense than shallow water!???

2006-12-18 08:08:38 · 3 answers · asked by Amanda 2 in Physics

covalent, ionic, hydrogen, or metallic?

2006-12-18 08:05:13 · 4 answers · asked by Lisa 1 in Chemistry

I've built a trebuchet catapult and have been firing plastacine down the corridor in the name of scinece. I'd like to know any simplish parabolic motion equatins? Oh and they'de be even better if they didn't need a value for initial velocity because I cant figure out how to work that out either. Basically, I'd like to be able to predict where the projectile is going to land before it ever gets there and then to compare that with the actual experimental results that I have. Any help would be greatly appreciated. Thanks all from a very weary A2 level student.

2006-12-18 08:04:45 · 3 answers · asked by Moi? 3 in Physics

find the laplace transform of the solution of the equation
(D^2_5D'+4)y=12+9e^t+5Sin2t
which satisfies the conditions y(0)=1 y'(0)=-2
another question........
Factor the following diffrential operators
2D^2+9D-5

2006-12-18 08:04:25 · 2 answers · asked by kater al nada 2 in Mathematics

2006-12-18 08:04:20 · 6 answers · asked by Anonymous in Engineering

I've built a trebuchet catapult and have been firing plastacine down the corridor in the name of scinece. I'd like to know any simplish parabolic motion equatins? Oh and they'de be even better if they didn't need a value for initial velocity because I cant figure out how to work that out either.

Basically, I'd like to be able to predict where the projectile is going to land before it ever gets there and then to compare that with the actual experimental results that I have. Any help would be greatly appreciated. Thanks all from a very weary A2 level student.

2006-12-18 08:04:06 · 6 answers · asked by Moi? 3 in Engineering

find the exact zeros of the function y = 6x2 + 5x - 3

use the qyadratic formular to solve the equation
16x2 - 8x = 3

2006-12-18 08:04:06 · 7 answers · asked by joan d 1 in Mathematics