Science & Mathematics - 20 July 2007

every car at a certain dealership is either a convertible, a sedan, or both. if 1/5 of the convertibles are also sedans and 1/3 of the sedans are also convertibles, which of the following could be the talta number of cars at the dealership....

ok so the answer is 28
but how do you solve this to get 28?

2007-07-20 15:07:08 · 2 answers · asked by Anonymous in Mathematics

A ladder is leaning against a house and is forming a 60 degree angle with the ground. If the top of the ladder is 24 feet off of the ground, how long is the ladder? Leave your answer in exact form.

48 ft

16 radical 3 ft

24 radical 3 ft

12 ft

2007-07-20 15:06:34 · 7 answers · asked by confused 3 in Mathematics

Use order of operations or BEDMAS

2007-07-20 15:04:10 · 16 answers · asked by GREG S 2 in Mathematics

2007-07-20 14:57:55 · 10 answers · asked by LiberT 1 in Mathematics

Question #1: Copper has a density of 8.92 g/mL. What mass of copper will occupy 45 mL? What volume of copper will have a mass of 1.0 kg (1000g)? Use significant digits.

I got these answers, but am not sure if they're correct:
Part 1: 4.0 X 10^2 g
Part 2: 110 mL

Question #2: The density of quartz was determined by adding a weighted sample to a graduated cylinder containing 56.3 mL of water. After submerging the quartz, the water level was 68.2 mL. The mass of the quartz was 36.5 g. What was the density of the quartz. Use significant digits.

I got this answer, but again I'm not sure if it's correct:
3.07 g/mL

Thanks for any help you can give me!

2007-07-20 14:52:24 · 3 answers · asked by Steven M 3 in Chemistry

2007-07-20 14:52:10 · 7 answers · asked by sueb3 2 in Zoology

25 light hours? This probe I speak of is Nasas longest ever deep space mission...

light travels at 300,000 kilometers per second

2007-07-20 14:49:39 · 2 answers · asked by Anonymous in Mathematics

Suppose that a complex, lab, or base had 3 levels underwater. They are Level B1, Level B2, and Level B3. Also the only way to get to B2 and B3 is by elevator. That means there are no stairways from B1 leading to B2 and no stairways from B2 leading to B3. Suppose that somehow B2 flooded. Would it be possible to escape by elevator from level B3 to B1 even though the top level B2 is flooded? What would it require to protect the elevator doors from the massive water pressure so that they are not destroyed? Even if the elevator shaft was protected from the water pressure on the outside of B2, could you even still use the elevator to travel back and forth between the dry levels or would it have to be shutdown? And what would B3 look like for anyone down in there, would there be obvious signs that the above level was flooded? I had a dream like this that got me thinking, I must be playing one too many video games!

2007-07-20 14:49:31 · 4 answers · asked by SDG 1 in Physics

2007-07-20 14:47:33 · 8 answers · asked by GREG S 2 in Mathematics

If someone was lost can a river tell you what direction is north or south?

2007-07-20 14:46:46 · 15 answers · asked by mexmami79 1 in Geography

With the exception of plants that only serve as food for animals, and trees.

Thanks.

2007-07-20 14:45:31 · 7 answers · asked by lizb 3 in Botany

2007-07-20 14:44:40 · 4 answers · asked by bonnie b 1 in Astronomy & Space

Given the reaction:
BaCl2(aq) + K2CrO4(aq) BaCrO4(s) + 2KCl(aq)
Calculate the following.

(1) The grams of BaCrO4 that can be obtained from 100.0 mL of 0.373 M BaCl2.

(2) The volume of 1.00 M BaCl2 needed to react with 50.0 mL of 0.413 M K2CrO4 solution.

2007-07-20 14:40:48 · 3 answers · asked by lulu 1 in Chemistry

How can I make a motion detector, from two cellphones, a floodlight, and a few other things? think third episode of Burn notice, where Michael had it rigged to set off the cell phone so he could tell when something was wrong. Anyone know how to make one?

2007-07-20 14:38:21 · 1 answers · asked by Anonymous in Physics

for the salwater junkies anyway,

does anybody use a diatomaceous filter?
how do you think they stand up with other kinds of fine filtration?

also does anybody use a fluidized sand bed?
same questions, and did you buy yours, or make it?

2007-07-20 14:27:03 · 3 answers · asked by Anonymous in Zoology

2007-07-20 14:25:06 · 1 answers · asked by Anonymous in Mathematics

2007-07-20 14:22:25 · 2 answers · asked by Michael W 1 in Engineering

2007-07-20 14:22:20 · 1 answers · asked by karen a 1 in Botany

I want to say that African continent is divided from Eurasian continent only by Suez canal and they are different continents
also South and North American continent is divided from each other only by Panama canal. So why American continent is one ?
when I believe that south and north American continent could be taken as 2 different .

2007-07-20 14:11:56 · 3 answers · asked by Jaguar 2 in Geography

I live in New Jersey and I found a bug that is six legged with 2 antennas and is black with a red dot. Does anyone have any idea what this bug could be? I leave basically in the woods.

2007-07-20 14:04:27 · 4 answers · asked by nicolehasacat 1 in Zoology

2007-07-20 14:02:56 · 16 answers · asked by preventtruthdecay 1 in Astronomy & Space

Is it the bacterial metabolism, it the bacteria itself or what? What causes it to smell exactly and why? The decomposition?

2007-07-20 14:00:58 · 4 answers · asked by accebere 2 in Biology

2007-07-20 13:53:06 · 19 answers · asked by Anonymous in Astronomy & Space

Ok. In America off the coasts of most beaches... like Daytona Fl., Panama Fl., and Myrtle Beach Sc.
Once a wave comes up and receeds it leaves behind things that I call 'diggers'. I know that's not the real name but I want to know exactly what they are. They are about 1 cm. long and are triangle shaped. They dig down into the sand after the wave leaves. Their shells are a variety of colors. I guess that they could be classified as a mollosk... They resemble an oyster or clam in the way that their shell is 2 shells tightly connected with an animal that resembles (there's no other way to say it)... snot.
So if anybody had any ideas I'd really appreciate it. This is one of those annoying questions that makes it so I cannot sleep untill I have an answer. Thanks.

2007-07-20 13:50:18 · 3 answers · asked by Echidna eats an enchilada 5 in Zoology

I'm not sure about this question either:

f(x) = -x^2 + k, what is the value of k if the endpoints of the parabola is (-2,0) and (2,0).

2007-07-20 13:40:38 · 4 answers · asked by Anonymous in Mathematics

5xy + 2x = 3
solving for y

2007-07-20 13:34:17 · 16 answers · asked by Anonymous in Mathematics

yesterday and above my car I heard a crash and saw a flash of light all around me, simultaneously. a minute or two later my right arm started to tingle, this feeling traveled to my left arm down through my body, and then to my legs, semi paralyzing me. there was nowhere to pull over, (rush hour in the fast lane on 291) so I tried to concentrate staying on the road. I knew I was experiencing some kind of electricity and I thought at the time my car had been struck. The heat and "burning" over my body got worse and I forced myself to raise my feet from the floor of the car and let go of the wheel. After this the semi-paralysis ebbed, but I still had limited mobility in my limbs. I shook for the next hour and was taken to the hospital to be checked out. I had no entrance or exit wounds, my car has no damage. my passenger side window was down about five inches through the whole event. What happened? If I was not struck why was I did I feel electricity go through me to such a degree?

2007-07-20 13:34:10 · 5 answers · asked by Anonymous in Weather

Can someone explain the logic behind this problem? How do I solve it, and how did you figure it out?

Mike said that when he opened his book, the product of the page numbers of the two facing pages was 7007. Without performing any calculations, prove that he was wrong.

2007-07-20 13:24:44 · 9 answers · asked by Anonymous in Mathematics

2007-07-20 13:20:22 · 16 answers · asked by Anonymous in Engineering

7 = 7(2b+5)-6(b+8) ?

helpppppppp!

2007-07-20 13:14:24 · 14 answers · asked by Anonymous in Mathematics