Questions Asked on
February 14, 2007

Biology
The endosymbiont hypothesis offers an explanation for how eukaryptoc cells could have obtained mitochondria and chloroplasts through a symbiotic relationship with prokaryotic cells that changed over time. What structural feature of prokaryotic cells might
asked by Marisol 
Grammar
When learning pronoun case (subjective pronoun,objective,possessive) do I need to just memorize the list? I am having trouble identifying them. Any help please. I am in 5th grade. I recommend memorize, using homemade flash cards. It wont take long to
asked by Lex 
Math
the distance between any two bases on a baseball diamond is 90 feet.What is the best approximation for the direct distance from home plate to second base? A baseball diamond's four bases form a square with 90 foot sides. A right triangle is formed by home
asked by Alexandria 
physics......PLEASE HELP!!
A steam engine absorbs 1.98*10^5 J and expels 1.49*10^5 J in each cycle. Assume that all of the remaining energy is used to do work. a. What is the engine's efficiency? b. How much work is done in each cycle? If a gasoline engine has an efficiency of 21
asked by anonymous 
chem
An automobile burns 65 grams of gasoline over 20 minutes. The gasoline combines with 100 grams of oxygen in this reaction, to form carbon dioxide and 47 grams of water. How much carbon dioxide is formed? do I use the heat capacity equation? How much oxyen
asked by tina 
word problem
The half life of cesium137 is 30 years. Suppose we have a 10g sample. a)Find a function that models the mass remaining after t years. b)How much of the sample will remain after 80 years? c)After how long will only 2 g of the sample remain? Thanks (a)
asked by Jen 
Help! Help! Organic Chemistry
Alcohol Dehydration of 4methyl2pentanol (a)based on the mechanism of the reaction, explain why (E) and (Z) 4methyl2pentenes and the 2methyl2pentene are the three major alkene products. (b)Explain why the reaction conditions promote carbocation
asked by Mae 
physics.......to bobpursley
Bobpursley: Which of the following systems have high entropy? Which systems have low entropy? a. papers scattered randomly across a desk b. a freshly opened pack of cards c. a cultivated field of cabbages d. a room after a party I sent this to you earlier
asked by anonymous 
Finance
The Carter Company's bond mature in 10 years have a par value of 1,000 and an annual coupon payment of $80. The market interest rate for the bond is 9%. What is the price of these bonds The coupon rate on the bond, (interest/principal at maturity) = 8%
asked by Dee 
Physics
In 1956, Frank Lloyd Wright proposed the construction of a milehigh building in Chicago. Suppose the building had been constructed. Ignoring Earth's rotation, find the change in your weight if you were to ride an elevator from the street level, where you
asked by winterWX 
PLEASE HELP
a). How many ways can a person select three appetizers and two soups if there are six appetizers and five soups on the dinner menu? b). Three married couples have bought tickets for six seats in a row for a movie.  HOw many ways can they be seated?  How
asked by Martha 
Chemistry
From your experience, predict which of the following reactions are spontaneous. a) Zn(s) + 2H+(aq)> Zn+2(aq) + H2 (g) b) CaCO3(s) + 2H2O(l) > Ca(OH)2(s) + H2CO3(aq) c) CH4(g) + O2(g) > CO2(g) + 2H2O(g) d) Ag+(aq) + Cl(aq) > AgCl (s) Our book
asked by Chris 
Gauss' Law!!!!!!!!!!
Can any one help me for this problem? The cube in Figure 2327 has edge length 1.40 m and is oriented as shown in a region of uniform electric field. Find the electric flux through the right face for the following electric fields, given in newtons per
asked by Lauren 
PHYSICS....PLEASE HELP
Which of the following systems have high entropy? Which systems have low entropy? a. papers scattered randomly across a desk b. a freshly opened pack of cards c. a cultivated field of cabbages d. a room after a party Whomever designed this question doe not
asked by anonymous 
physics
a drop of oil vol 0.05 cm3 is released from a medicicne dropper on to a calm surface pond where it spreads out to cover an area of 40 cm 3. Assume oil film is uniform thickness equal to diameter of oil molecule. Calculate the diameter of oil molecule and
asked by bex 
World Studies
Why is it important that Christopher Columbus found America? Due to his discovery of the Americas, it kicked off the age of exploration for the Europeans. Soon this led to the colonization of the north and south Americas. Hope that helped =P Did he
asked by Emily 
Chemistry
A solution of a weak acid will consist of the acid and its conjugate base. True or False false Yes, of course: Take acetic acid acetic acid + H2OH3O+ + acetateion The system is in equilibrium. true
asked by KHNJ 
Check!!!
okay so the question is: A unit circle center at the origin undergoes a series of transformations. The equation of the resulting graph is (x3)^2+ (y+4)^2= 25 describe the transformation the unit circle underwnt Answer: The original circle was centered at
asked by math 
Chemistry
Is dissolving salt in water an example of reversible? I don't think so because once salt is in water, the water is not clear anymore. Pls help. thanks. Yes, it is reversible. One ca physically separate the salt and water (evaporation) What do you mean by
asked by Linda 
chemistry
what are some the different types of chemical reactions that occur on a daily basis our lives? wouldnt there be many? eating, taking medications, would emotion be or cause chemical reaction? All of the above. Add breathing. Don't forget the cars we drive,
asked by key 
computers
why do we need computer ethics? Why should we need ethics at all? The next question is why should computers change that? that doesnt answer me question Actually, it does. Think. Are you clear on the meaning of the word "ethics"?
asked by Nilo 
HHEELLPP!!!!!!!!!!!!!!!!!
can anyone write a real world situation that can be represented by the given expression n + 7 5n 1/4n 2n 12 n/10 + 23 misidentified on subject line like write a situation using these numbers Here is one as an example: The amount of illuminated tracer
asked by Anais 
math
How do I change a fraction to a percent? Like 9/15 to a percent for instance. put 9/15 in your calculator and hit equals
asked by math 
math
how do i do x2+12x+32 x2+12x = 14x+32 subtract 14x from each side 14x=32 divide by 2 7x=16 x=16/7, which is 2 and 2/7 ok maybe you typed that question wrong? is it x^2 + 12x + 32 ? if it is then the solution is: (x+8)(x+4) because when you multiply them
asked by bob 
Math
Simplify: 5x{2419)x[25+23)divided by 12(97)} Please help! Subject is algebra. sorry please help! Am I working the problem correctly? IS THE ANSWER 50? 5x{2419)x(25+23)divided by (12(97)) = (5x5x48)/(122) = (25 x 48)/10 = ? No, the answer is not 50.
asked by Matthew 
Decaf Coffee
Is decaf coffee completely decaffinated?? .. or are there low amounts of caffiene in brewed decaf coffee? (i'm researching about people with health conditions concerning caffiene... if they even should be drinking decaf coffee at all!!)  can anyone find
asked by TechnoBoi11 
Chemistry and Balancing
Mr Pursley. i was wondering if you would be kind enough to explain to me the process of balancing equations I undestand some of the rules but I continue, to make simple mistakes. Would you kindly offer some assistance please, via email. To help me get
asked by Mark 
biology
List 5 functions of protein in the body. Thanks in advance. Since this is not my area of expertise, I searched Google under the key words "protein functions" to get these possible sources: http://en.wikipedia.org/wiki/Protein (Broken Link Removed)
asked by Kathlene 
Word problem 2
The 1985 Mexico city earthquake had a magnitude of 8.1 on the Richter scale. The 1976 earthquake in Tangshan, China was 1.26 times and intense. What was the magnitude of the Tangshan earthquake. Thanks
asked by Jen 
world war II
What were the federal departments that were established to carry out the way World War II was to be fought? http://en.wikipedia.org/wiki/Politics_of_the_United_States_during_World_War_II Check out the Cabinet listing. =) european theater and pacific
asked by cher 
College Math  Word Problem
An artist entered two paintings (Lighthouse and Cathedral) ina show. He feels that the probabilities are 0.15, 0.18 and 0.11, respectively, that he will sell the Lighthouse, Cathedral, or both. What is the probability that he will sell either of the two
asked by Martha 
HELP?? Math
A group of children can be classified according to eye color (blue, brown, green), gender (male, female) and hobby (collecting stamps, collecting baseball cards, collecting shells, collecting stickers). How many possible different classifications are
asked by Crystal 
ALGEBRA 1
Use inductive reasoning to predict the next Number in each sequence. 1.3,7,11,15... i figure this to be 19 because each number following the first is a difference of 4. 2. 1,2,4,8 this is abit difficult for me. I am guessing the answer tobe 10. I
asked by DANIELLE 
Tale of Two Cities
I have to write a comparsion essay comparing the two cities, London and Paris. What are their differeneces? Please help. What can some of my points be? Please read the opening passage of this novel. What does Dickens say about the differences and
asked by Marta 
Geography
If you just land in Australia no sign of civilization wat would you do to make a axe or something sharp to cut wood to make houses and such? This site tells how early people made sharp objects. http://weber.ucsd.edu/~dkjordan/arch/tools.html
asked by R 
Please Help  PROBABILITY
At a fair run by a local charity organization, it costs 50 cents to try one's luck in drawing an ace from a deck of 52 playing cards. What is the expected profit per customer if they pay $4 if and only if a person draws an ace. I presume that the drawn
asked by Martha 
Maths
What is surface area and how do you work it out? Surface area is the area on an object. How one works it is dependent on the object. SURFACE IS THE AREA OF ANY OBJECT. AND HOW IT WORKS IS IF YOU HAVE A SQUARE AND YOU WANT TO FIND THE PERIMITIER THEN YOU
asked by Sarah 
algebra 1
A plane trip scheduled between Tampa and St. Petersburg was scheduled for 22 minutes. The distance is about 17 miles. How fast would the plane be traveling in miles per hour? 22/60=.367 hrs so 17 miles in .367 hr = x miles in one hr 17/.367=x/1 x=46.32 mph
asked by H.C. 
World Studies
Why was the Civil War important? Why was World WarII important? Please answer my questions! http://en.wikipedia.org/wiki/World_War_I http://en.wikipedia.org/wiki/World_War_II Please note that we are not here to do students' homework for them. Our tutors
asked by Emily 
Science
when working with the particle theory, for which changes of state does the volume increase? and Decrease? volume changes greatly when going to the gas state. what part of the system is missing
asked by tesa 
Chemistry
What is the pH of a solution with [OH] = 2.5 x 103? I don't even know where to begin with this problem :( You know [OH] + [H+] = 1*10^14 so solve for [H+], then pH= log [H+]
asked by KHNJ 
English
I can't figure this question out. Is "And may the muse inspire each future song" a metaphor a heroic couplet a parallelism an allusion That is an allusion. What is a "muse"? What would this person be wishing for? Thanks :) never been great at those types
asked by Anonymous 
Chemistry
Is cutting a tree reversible? Several things come to mind, maybe not the same tree will grow back or not. Pls help. Thanks much. Cutting a large tree DOWN, as in severing the trunk, surely is not reversible. We can't cut the tree down, then glue it back
asked by Nathan 
ALGEBRA 1
If M angle 1 =3X=10 and M angle2=x=14 and clld, find the value of x. Here is what I DID NOT SURE IF I am on the right path 3x+1o=x+14 3x=x+1410 2x=4 x=4/2 x=2 Thanks much.
asked by DANIELLE 
math
what is 80% of 5? 4 4
asked by kayla 
math
Driving down a mountain, torn finds that he has descended 1800 ft in elevation by the time he is 3.25mi horizontally away from the top of the mountain. Find the slope of his descent to the nearest hundredth. 2,175
asked by stacy 
logarithms
5^x=5^6 Take the log base 5 of each side: log5 5^x=log5 5^6 x= 6 is your teacher Mrs. Lake?
asked by ashley 
computers
what does this mean: what are some of the immediate concerns of computer ethics today?? sorry i am albanian and i do not understand english very well The concern of fraud, and fake sites. The concern of abuse of children The concern of the unrestricted sex
asked by Nilo 
math
turn this equation: X2 (X to the second power)+16x+15x I'm suppose to use the Distributive Property to factor this expression......HOW?!?!?!? And I also have to show the steps. how?!?!? please help!!
asked by Ashlie 
spanish
Hi, can you help me figure out what this paragraph says. Se ve en la cara que le duele alguna parte de su cuerpo. Tal vez comio demasiados dules y tiene dolor de estomago o le duele la cabeza. Quizas le duele el codo o la mano porque estaba jugando al
asked by brent 
physical science
what do this statement mean light plus light=no light http://www.exo.net/~pauld/summer_institute/summer_day8interference/Interference_laser.html
asked by shantelle 
science
what happens to the load on a bridge that carries the Goeta Canal when a boat passes slowly through the canal? The Goeta canal in Sweden is not carried by a bridge. There are bridges over it. The loads on the bridges do not depend upon water traffic below.
asked by kelly 
History
What were some of the technological and urban transformation effects on the middle class in 19th century Europe? Please see the social effects in this article. http://en.wikipedia.org/wiki/Industrial_Revolution This site addresses your question more
asked by Jim 
business
Debate the ethics of doing business in countries with totalitarian governments looking for holes and inconsistencies. Attempt to answer any arguments that are presented against your side of the argument. Please tell us your ideas and we'll be glad to
asked by joni 
Chemistry
When determining the pH of a solution, will the indicator react with and change the properties of the solution. No, not significantly.
asked by KHNJ 
Chemistry
All acidbase indicators change color in the same pH range. All? What is your thinking on this? Surely you do now want us to do your thinking for you
asked by KHNJ 
English
I can't find anything about Puritan Punishment. I am try to figure out what they believed was an effective mean of punishment? I googled it and everything. Does anyone know? http://russell.gresham.k12.or.us/Meling/newcrimeandpunish.html
asked by a/n 
intro to Psychology
I am working on some homework where I have to identify the unconditional stimulus, unconditional response, conditional stimulus, and conditional response. I am finding this very diffucult and didn't know if there was any one out there that could help me.
asked by Esther Johnson 
health
This a research on HIV/AIDS It is believed that in 1959 is the earliest known case of AIDS and the discovery suggest that AIDS virus has a common African ancestor. Later on (1981), men (gay) were getting sick with pneumonia and dying and discovered that
asked by haydee 
chemistry
We did this in a lab and nothing happened, but I'm pretty sure something was supposed to happen, so my question is: What happens when you put a pellet of sodiumhydroxide on a watch glass and observe it for 510 minutes? If there were hudidity in the air,
asked by Natasha 
MATH
For the floor plans given in exercise27, determine whether the side through the points (2, 3) and (11, 6) is perpendicular to the side through the points (2, 3) and (3, 18). Compute the slopes of the two lines. If the product of the slopes is 1, then te
asked by stacy 
Calculus
Factor the following: y = (xa)^5 . (xc)^5 . (ac)^5 It looks already factored to me
asked by Raj 
atoms
If i was to draw a diagram of a hydrogenatom with one electron and its many spectral lines would i need to draw the BOhr model with the nucleus in the middle and 3 outer rings or have i lost the plot That is one way. Actually, there are an infinite number
asked by bex 
World Studies
What are some events that happend in history and why are they important? (at least a list of 4) http://www.hyperhistory.com/online_n2/History_n2/a.html Wow! Take your pick!! =) Don't forget such tings as the discovery of penicillin, the discovery of AIDS,
asked by Emily 
Art Help
I'm writing a paper on Masaccio. So far, I've gotten it to a page and figured out that I need about 3 paragraphs about his art and then my conclusion. The problem is that i'm getting conflicting information. Most places say that only 45 of his works have
asked by Claire 
Aaron
Is 2041 rounded to the nearest hundred 2000 or 2100? http://www.math.com/school/subject1/lessons/S1U1L3GL.html Read about rounding off whole numbers. Ask yourself this: Is 2041 closer to 2000 or 2100? Same answer.
asked by Math Question 
math
(s2)3/4 I don't know what you mean. Use ^ to mean an exponent follows. how do you convert mph to miles/meters per second?
asked by kayjay 
math
how do you write an equivalent addition equation
asked by jacob 
Math
How many kilometers are in 153900 mm? do i just divide by 1000? (Broken Link Removed) Looks like it! =) 30lb=_____kg?
asked by Nick 
alg 2
Solve: (4  rad 3 i)+3 /(4rad 3 i)3
asked by angie 
Spanish
Can you guys proofread these paragraphs for me please? Where are the pargraphs by Kshore?
asked by Kishore