Science & Mathematics - 16 September 2007

well, i already had a prevoius answer and i am satisfied with that but i want a new one(more profound and greater). hope you can find one. thnks

2007-09-16 15:20:26 · 7 answers · asked by j0mar a 1 in Mathematics

Solve the system of equations using substitution:
x=2y + 1
-6y = -3x + 3

A. Infinitely many solutions
B. no solution
C. (0,0)
D. (0,0) and (0,2)

2007-09-16 15:19:32 · 10 answers · asked by DoWHATiDO 3 in Mathematics

carry out the indicated operation and give your answer with the specfied number of significant digits?

Question1) 45 x 32.1;5 significant digits

2007-09-16 15:19:31 · 1 answers · asked by cassie05 3 in Mathematics

Classify the triangle described below as acute, right or obtuse using the Converse of the Pythagorean Theorem.
Side lengths are 26, 10, 17.

2007-09-16 15:16:00 · 15 answers · asked by Anonymous in Mathematics

Simplify.
3x(y-2)+y(5-x)

2007-09-16 15:15:24 · 4 answers · asked by hockey1991player 1 in Mathematics

2007-09-16 15:14:45 · 5 answers · asked by rajinams 1 in Geography

2007-09-16 15:14:43 · 1 answers · asked by sunchicano 2 in Mathematics

2007-09-16 15:12:39 · 23 answers · asked by Anonymous in Mathematics

2007-09-16 15:12:33 · 6 answers · asked by Ivette A 1 in Earth Sciences & Geology

I've been looking around at different sites,papers,and science magazines,and what they all have in common is that they all say the same things.In and about 2010-2012 we,that means us as a planet,will be heading into a very turbulent and energetic section of our universe.The ambient radiation of cosmic levels will be higher,more foreign objects such as meteors,or comets,and maybe rogue planets. It seems that science doesn't really know, but it's scary just the same.As far as locally,the Sun is going to go through the largest solar maximum ever recorded.In past maximums borialis phenomenon was at very high levels,and satellites were even knocked offline globally,as well as ground utilities in the west. This next one is supposed to be 50 times more powerful.Also the planet is going through a magnetic wobble,which may switch north and south poles.With all this information and no one really saying anything about it nationally, what are things we can expect to see going on in everyday life?

2007-09-16 15:10:49 · 15 answers · asked by lumendelsol 3 in Astronomy & Space

You are told that you need a jar with a volume of at least 150 cm cubed. The label on the jar you find says 0.16 litres. Can you use it?

2007-09-16 15:10:08 · 5 answers · asked by Anonymous in Mathematics

2007-09-16 15:09:02 · 3 answers · asked by Anonymous in Engineering

Solve the system:
8x-2y = 3
0.8x = 0.3 + 0.2y

Is it:
A. R
B. NO SOLUTION
C. {(x,y)l 8x-2y = 3
D. (0,3)

2007-09-16 15:08:33 · 2 answers · asked by DoWHATiDO 3 in Mathematics

2007-09-16 15:06:46 · 17 answers · asked by *october girl* 4 in Medicine

please explain step by step, i do want to learn

Trent can deliver his newspapers in 30mins. It takes Lois 20 mins to do the same route. How long would it take them to deliver the newspapers if they work together?

2007-09-16 15:03:30 · 2 answers · asked by stop global warming!!! 1 in Mathematics

2007-09-16 15:02:43 · 4 answers · asked by Anonymous in Medicine

2007-09-16 15:02:15 · 3 answers · asked by juicyjunkie 1 in Chemistry

During one week, a dealer sold the following vehicles:


Toyota
Ford
Nissan
Totals

Sedans
6
9
7


Trucks
10
8
11


Totals







If one of these vehicles is selected at random, find the probability that it is a Nissan truck.


13/51
11/51
19/51
29/51

2007-09-16 15:00:50 · 2 answers · asked by vanilla_latte62 1 in Mathematics

Hi! I was wondering if anyone knew some good websites with dimensional analysis problems?

2007-09-16 14:59:02 · 2 answers · asked by Sgt. Pepper 2 in Physics

I'm writting an essay about a dude who harmed his friend's eyes with acid during his chemistry class.

anyone know any type of acid that would harm your eyes (pretty badly) that is used in school?

2007-09-16 14:58:42 · 6 answers · asked by Anonymous in Chemistry

A bag contains 5 red marbles, 10 blue marbles, and 20 green marbles.
If two marbles are taken out at random, one by one, without replacement, what is the probability that they are both blue?

2007-09-16 14:58:26 · 1 answers · asked by vanilla_latte62 1 in Mathematics

Please give me the x and y intercepts so I can graph this:

A girl goes for a walk. She leaves home, walks 2 blocks in 5 mins at a constant speed, she forgets her keys and runs home in 1 minute . While at her door it takes her 1 minutes to find her keys and lock the door. She then walks 5 blocks in 15 minutes, and then decides to jog home. It takes her 7 minutes to jog home. Draw a graph of the girl's distance from home (in blocks) as a function of time.

b) Draw a graph for the number of blocks that the girl walked as a function of time.

2007-09-16 14:57:37 · 1 answers · asked by Anonymous in Mathematics

Please help.

2007-09-16 14:56:42 · 3 answers · asked by ??? 2 in Chemistry

A helicopter is flying horizontally at 8.3 m/s and an altitude of 20 m when a package of emergency medical supplies is ejected horizontally backward with a speed of 13 m/s relative to the helicopter. Ignoring air resistance, what is the horizontal distance between the package and the helicopter when the package hits the ground?

I've tried to work this problem about 10 different ways, but nothing seems to work...

2007-09-16 14:54:58 · 6 answers · asked by Doogin 3 in Physics

A model of a helicopter rotor has four blades, each 3.60 m in length from the central shaft to the blade tip. The model is rotated in a wind tunnel at 580 rev/min.

(a) What is the linear speed of the blade tip, in m/s?
_________m/s
(b) What is the radial acceleration of the blade tip expressed as a multiple of the acceleration due to gravity, g?
_________ g

2007-09-16 14:54:39 · 2 answers · asked by Anonymous in Physics

2007-09-16 14:54:30 · 1 answers · asked by John M 2 in Chemistry

please dont just give me the answer, i really do want to learn, please explain step by step, because im really bad at math.

Two cars enter the Florida Turnpike at Commercial Boulevard at 8:00am, each heading for Wildwood. One car's average speed is 10 miles per hour more than the other's. The faster car arrives at Wildwood at 11:00 am, 1/2 hour before the other car. What is the average speed of each car? How far did each travel?

2007-09-16 14:54:28 · 10 answers · asked by stop global warming!!! 1 in Mathematics

whycant you drink salt water i have a project and i came across this question

2007-09-16 14:53:42 · 9 answers · asked by Anonymous in Biology

A 4.90 g bullet leaves the muzzle of a rifle with a speed of 317 m/s. The expanding gases behind it exert what force on the bullet while it is traveling down the barrel of the rifle, 0.800 m long? Assume constant acceleration and negligible friction

2007-09-16 14:53:12 · 1 answers · asked by ひいらぎ 5 in Physics

When a ball is at it's peak height (if you threw a ball in the air), is it at equilibrium?

2007-09-16 14:52:20 · 1 answers · asked by Shawn 1 in Physics