Science & Mathematics - 30 December 2007

I know there is evolution, but how is it possible? I heard whales once walked on land, but how did legs turn into flippers? And why is our appendix growing shorter? Why do we change and how does our bodies and children know how to change?

2007-12-30 08:51:33 · 19 answers · asked by Anonymous in Biology

2007-12-30 08:51:24 · 7 answers · asked by lalu 1 in Weather

Puebla, Mexico or Los Angeles, CA

2007-12-30 08:50:31 · 7 answers · asked by Anonymous in Geography

2007-12-30 08:47:35 · 3 answers · asked by go_sri 2 in Earth Sciences & Geology

2007-12-30 08:47:24 · 1 answers · asked by go_sri 2 in Earth Sciences & Geology

The math problem is:
The length of a rectangle is 3 more than twice its width. The perimeter is 48 feet. Find the width.
This is how you solve it:
L = 2W + 3
P = 2L + 2W = 48

2(2W + 3) + 2W = 48
4W + 6 +2W = 48
6W + 6 = 48
6W = 42
W = 7


I'm a little confused when it comes to this part...
2(2W + 3) + 2W = 48
^ i don't understand where you get this 2 from?


can someone please clarify this to me for 10 points =)



Thnk you
Happy n healthy new year :]

2007-12-30 08:44:42 · 10 answers · asked by H0llywoodzZ Star (: 2 in Mathematics

I'm doing a project for science...

2007-12-30 08:43:19 · 1 answers · asked by dancerlaur 3 in Earth Sciences & Geology

2007-12-30 08:41:26 · 9 answers · asked by D*Star 1 in Mathematics

Well is it? for a lap top I mean.

2007-12-30 08:40:13 · 2 answers · asked by Elaina W 2 in Earth Sciences & Geology

Ugh,
i am working on a science project and it asks how many moons does saturn have? well i cant find the answer any where because all the websites i have been to all have different answers. so if any of you know anything please inform me. thanks you. the question again was how many moons does saturn have?

2007-12-30 08:33:39 · 8 answers · asked by Anonymous in Astronomy & Space

Mangosteen, does it work? Where is the proof that this Southeast asian fruit works to heal and act as an antioxidant?

Where is the real research to back up its claims?
No youtube videos please...

2007-12-30 08:27:48 · 4 answers · asked by pixelchix 3 in Medicine

2007-12-30 08:26:48 · 2 answers · asked by AyeBay 2 in Mathematics

2007-12-30 08:22:51 · 10 answers · asked by CherryCheri 7 in Astronomy & Space

a. alkali metals only
b.alkaline earth metals only
c. both alkali and alkaline earth metals
d.neither alkali nor alkaline earth metals

2007-12-30 08:21:51 · 1 answers · asked by Anonymous in Chemistry

2007-12-30 08:20:46 · 4 answers · asked by Victor V 1 in Mathematics

Jaime and her friend can keyboard 45 words per minute. Six other students in the class can type 30 words per minute. Four students have not yet timed their speed. Find the ratio of students who have timed their keyboarding to those who have not.

.5
2
.7
1.5

2007-12-30 08:16:46 · 4 answers · asked by sunny p 1 in Mathematics

I need a Hypothesis for ---- How can using baking soda and vinegar inflate a balloon??

2007-12-30 08:16:11 · 2 answers · asked by Anonymous in Chemistry

please give the solution

2007-12-30 08:14:01 · 2 answers · asked by ans karunagappally 1 in Mathematics

Please, can anybody tell me how to figure out the problems that my teacher gave to my class to review for an AP chemistry Test shes giving us a in a couple of days and I have no clue how to solve these problems.

The following problems are:

1) Calculate the molarity of C2H5OH in a water solution that is prepared by mixing 50 ml of C2H5OH with 100 ml of Hs0 at 20 degrees Celsius. The density of the C2H5OH is 0.789 g/ml at 20 degrees Celsius.

2)What is the molarity of a solution of 50 g of propanol (CH3CH2CH2OH) in 152 ml water, if the density of water is 1.0 g/ml.

3). A solution containing 296.6g of Mg(NO3)2 per liter has a density of 1.114 g/ml. The molarity of the solution is what?

2007-12-30 08:12:45 · 3 answers · asked by Tachi 1 in Chemistry

a.beryllium
b.cesium
c.calcium
d.barium

PLEASE HELP?!?!

2007-12-30 08:11:58 · 5 answers · asked by Anonymous in Chemistry

(1) plasma, alveoli, proteins
(2) platelets, mucus, red blood cells
(3) phagocytes, platelets, proteins
(4) hemoglobin, capillaries, white blood cells

2007-12-30 08:06:28 · 3 answers · asked by Kevin G 2 in Biology

Quick Question:

How many ml of 18.4 M H2SO4 are needed to prepare 600 ml of .10 M H2SO4?

2007-12-30 08:05:26 · 2 answers · asked by Tachi 1 in Chemistry

Giordano's Pizza Shop is famous for its spectacular Giordano's Giant, a large gourmet pizza that's big enough to feed 16 people! There is a base charge for the plain pizza, and then an additional charge per topping ordered from the list of 20 possible items. All the toppings are priced equally.


A Giordano's Giant pizza ordered with 2/5 of the possible toppings will cost $46.50. One with 30% of the possible toppings will cost $41.80. Using that information, answer the following questions:

Find an equation that expresses the total cost of a Giordano's Giant pizza in terms of the number of toppings ordered.

How much would a Giant pizza with all the possible toppings cost?

If a customer ordered a Giant pizza that cost $55.90, what percent of the toppings did she order?


i'm only an 8th grader , please help.

2007-12-30 08:02:29 · 5 answers · asked by Lola Bunny 1 in Mathematics

Venus has temperatures of 900F, due to high CO2 levels in the atmosphere creating a greenhouse effect. I am just looking for numbers. Education on why global warming does not exist is not necessary. Thanks

2007-12-30 08:02:14 · 3 answers · asked by paul v 1 in Earth Sciences & Geology

2007-12-30 07:58:05 · 4 answers · asked by Anonymous in Biology

2007-12-30 07:57:37 · 6 answers · asked by Anonymous in Mathematics

if strong acid can dislove and burn material - even flesh - then what does strong alkaline do

2007-12-30 07:53:50 · 2 answers · asked by Anonymous in Chemistry

Don't be an idiot and answer "how we say something is funny."

I mean physically, what in our body is making us laugh, and why?

2007-12-30 07:52:55 · 3 answers · asked by Anonymous in Physics

Please, can anybody tell me how to figure out the problems that my teacher gave to my class to review for an AP chemistry Test shes giving us a in a couple of days and I have no clue how to solve these problems.

The following problems are:

1) A solution of hydrogen peroxide is 30% H2O2 by mass and has a density of 1.11 g/cm3. What is the molarity, if even possible

2) Calculate the molarity of C2H5OH in a water solution that is prepared by mixing 50 ml of C2H5OH with 100 ml of Hs0 at 20 degrees Celsius. The density of the C2H5OH is 0.789 g/ml at 20 degrees Celsius.

3)What is the molarity of a solution of 50 g of propanol (CH3CH2CH2OH) in 152 ml water, if the density of water is 1.0 g/ml.

4). A solution containing 296.6g of Mg(NO3)2 per liter has a density of 1.114 g/ml. The molarity of the solution is what?

2007-12-30 07:47:43 · 3 answers · asked by Tachi 1 in Chemistry

step by step plz

2007-12-30 07:46:03 · 2 answers · asked by John 1 in Mathematics