Monday
October 20, 2014

Posts by Tom


Total # Posts: 1,099

Chemistry
Why do we have these two equations: ΔH° = ΣD (bond broken) – ΣD (bond formed) and ΔH = Σ ΔHf products - Σ ΔHf reactant I don't understand when we use which one and why? Please help. Thanks.
April 5, 2010

hsm 210
week 8 . need hel getting started with evaluating communication strategies
March 31, 2010

Biology
Glycolitic enzymes are required for glycolysis-energy production. These enzymes G6P dehydrogenase 6PG dehydrogenase are requred for neucleotide and nucleic acid biosyntheses- the restoration of damaged cells (and their DNA) after injury
March 28, 2010

Algebra
thank so much
March 24, 2010

Algebra
There are three consecutive integers the square of the largest one equals the sum of the squares of the two other.Find the integers
March 24, 2010

math
what is the remainder when ka^3-3a^2+5a-8 is divided by a+1. please help and thank you
March 22, 2010

algebra
3 4/9 x 1 4/5 show work please
March 21, 2010

critical thinking
Red herring
March 15, 2010

chemistry
Given 1.115 atm of carbon monoxide reactimg with 1.553 atm of oxygen in a closed container at a constant temperatue, what is the theoretic yield of the carbon dioxide?
March 15, 2010

chemistry
how many grams of solute are in 250ml of 0.500M glycerin . (C3H8O3=92.1 amu)?
March 14, 2010

AP BIO
2. Suppose the DNA molecule were composed of six monomers. In addition to the monomers A, T, C and G, two other monomers, O and P, were present. Furthermore, O and P were known to pair only with each other. Which of following statements regarding this kind of DNA molecule ...
March 14, 2010

AP BIO
1. A biologist measured the amount of DNA in several single diploid cells taken from a culture. He knew that these cells could divide mitotically, but not meiotically. His data is shown below: Cell Number and DNA content in micrograms: Cell 1 (11.1 micrograms) Cell 2 (5.4 ...
March 14, 2010

Statistics
Calculate the following: a) Determine the sample size necessary to estimate a population mean to within 1 with a 90% confidence given that the population standard deviation is 10. b) Suppose that the sample was calculated at 150. Estimate the population mean with 90% confidence.
March 13, 2010

Statistics
Determine the sample size necessary to estimate a population proportion to within .03 with 90% confidence assuming you have no knowledge of the approximate value of the sample proportion.
March 13, 2010

Statistics
Draw the operating characteristic curve for n = 10, 50, and 100 for the following test: Ho: ì = 400 Hi: ì > 400 á = .05, ó = 50
March 13, 2010

Statistics
HO: µ = 70 H1: µ > 70 ó = 20, n = 100, xbar = 80, á = .01 a) calculate the value of the test statistic b) set up the rejection region. c) determine the p-value d) interpret the results
March 13, 2010

statistics
A statistics practitioner would like to estimate a population mean to within 50 units with 99% confidence given that the population standard deviation is 250. a) What sample size should be used. b) Repeat part (a) with a standard deviation of 50. c) Repeat part (a) using a 95...
March 13, 2010

Auditing
8 d
March 11, 2010

pre-calculus
Graph each complex number. Then express it in rectangular form. 2(cos(4pi/3) + isin(4pi/3)) I don't understand where to go from here.
March 9, 2010

calculus
Evaluate lim as x-> 0 square root (x+1) - square root (2x+1) / square root (3x+4) - square root (2x+4)
March 7, 2010

Math
What is the fromula to calculate the volume of a washer?
February 19, 2010

quick precal concept
is there no solution for a triangle with C=50deg a=25 c=22?
February 18, 2010

mth 157
Determine which types of display could be used to illustrate the given data. 4) The midterm test scores for the seventh-period typing class are listed below. 85 77 93 91 74 65 68 97 88 59 74 83 85 72 63 79 Which of the following types of display could be used to illustrate ...
February 15, 2010

mth 157
Drawing one slip, what is P (slip contains a vowel)?
February 11, 2010

biology
what are some of the ways in which we can differentiate spores from coccus shaped bateria?
February 10, 2010

biology
what are three function of a teeth
February 7, 2010

biology
what are three function of a teeth
February 7, 2010

biology
what are three function of teeth
February 7, 2010

Biology
Can you give the speed in the capillaries as a percentage of the speed in the arteries.
February 6, 2010

Biology
Why is it desirable for blood to flow through the capillaries comparratively slowly.
February 6, 2010

Biology
Is there an experiment which you could do to test the suggestion that veins have more stretchable walls than arteries.
February 6, 2010

Biology
Is there an experiment which you could do to test the suggestion that veins have more stretchable walls than arteries.
February 6, 2010

Biology
Why veins contain valves.
February 6, 2010

Biology
Why capillaries have very thin walls.
February 6, 2010

physics
113.5
February 5, 2010

Language
How do I set up a comparsion table for two stories
February 3, 2010

math
Solve the inequality and show the number line. x + 29 < 33 for x > 0
February 2, 2010

Biology
Why arteries have more muscle in their walls than veins
February 2, 2010

Biology
Why the left ventricle has a thicker more muscular wall than the right ventricle.
February 2, 2010

Biology
Why the right atrium is larger than the left atrium.
February 2, 2010

Biology
Why does the blood pressure goes up and down all the time.
February 2, 2010

Can't understand trig problem
Your answer is right
February 1, 2010

Carpentry
Parts of a concerte block
January 31, 2010

cjs 250 Intro to security
if a church has no security plan in place, what would be a less pertinent component for that particular environment during a vulnerability assessment?
January 29, 2010

FDA
whats the FDA's main job has it Has it implemented any new rules recently?
January 18, 2010

Politics
When and why was The FDA formed? Was it in response to a national event or some sort of emergency?
January 17, 2010

carpentry
how to install a lock
January 15, 2010

religous
from the 4 theories which is least likly to bene fit from wining the lottery and why
January 15, 2010

Religious
Explain the concept of hedonism an how is this concept seen as the dominant theory in our society today.
January 15, 2010

Religious
why is the concept of determism often regarded as more important than christianity.
January 15, 2010

Accounting
North Pole Cruise Lines issued preferred stock many years ago. It carries a fixed dividend of $6 per share. With the passage of time, yields have soared from the original 6 percent to 14 percent (yield is the same as required rate of return). A. What was the original issue ...
January 10, 2010

biology
Compare and contrast the phloem and xylem vessels.
January 5, 2010

biology
explain how water is transport from the root to mesophyll cells in a leaf
January 5, 2010

religion
Much Thanks, Ms. Sue.
January 4, 2010

religion
Does anybody have a website with recent demographics on religions or at least Buddhism? Google doesn't really help.
January 4, 2010

carpentry
Explain the number behind the abrasive sheets
January 3, 2010

Carpentry
Explain the number behind the sheets
January 3, 2010

carpentry
list types of abrassive material.
January 3, 2010

carpentry
What is abrassive.
January 3, 2010

History
When did the Latin American Revolution start?
December 20, 2009

Social Studies
What was the purpose of Hammurabi's Code
December 13, 2009

economics
"The Fed should simply increase the money supply at the same rate that the full employment economy grows, and the government should desist from any stabilizing urges." What school of thought would make this suggestion, and how do economists of that school justify ...
December 13, 2009

physics
A dolphin jumps with an initial velocity of 10.5 m/s at an angle of 32.0° above the horizontal. The dolphin passes through the center of a hoop before returning to the water. If the dolphin is moving horizontally when it goes through the hoop, how high above the water is ...
December 10, 2009

physics
A 0.34 kg pendulum bob is attached to a string 1.2 m long. What is the change in the gravitational potential energy of the system as the bob swings from the bottom of the string, where θ = 37°? i dont know how to do this. The bottom of the string is 1.2 m and it moves...
December 9, 2009

arithmetic
On one of the questions of a recent math test, a student divided by 9 instead of multiplying by nine. This computation gave an answer of 18. What's the correct answer?
December 8, 2009

music
5 ways to change a melody to an arrangement
December 8, 2009

electrical
Explain the term short circuit and open circuit ?
December 2, 2009

Physics
A 0.15 kg baseball is thrown towards a batter with a velocity of 40 m/s. The batter hits the ball and returns it directly back with a velocity of 60 m/s. What is the change in momentum of the ball?
November 30, 2009

Family Life
Information on drugs
November 26, 2009

Language
How do you start off a business letter.
November 23, 2009

algebra
parallel to line 2/3x-4=0 through (-4,-6)
November 21, 2009

pre-algebra
just do the price, in BRAND A's case 15.98 times the discount- 30%...move the decimal back two places...turns into .30 15.98 X .30 = your answer
November 19, 2009

family life
information on teenage pregnancy
November 13, 2009

Chemistry
How many milliliters would it take to titrate 10.0 mL of 0.75 M HCl with 0.10 M NaOH?
November 10, 2009

ancient history
go to google and type in roman goddess of love. You will get tons of information.
November 10, 2009

science
Explain why the index of refraction of an object is a physical property?
November 8, 2009

science
what do you notice about the ratio (sin θi/ sin θR) for all angle of incidences greater than 0 degrees? explain why you would expect this to be true?
November 8, 2009

family life
One more thing Can you give me an example of a goal . Thanks.
November 8, 2009

Family Life
how to create a step-by-step action plan.
November 8, 2009

Family life
How to set up a short-term health goal.
November 8, 2009

Family life
Can you name a short-term health goal
November 8, 2009

Accounting
1. A company acquired some land for $80,000 to construct a new office complex. Legal fees paid were $2,300, delinquent taxes assumed were $3,400 and $5,850 was paid to remove an old building. What is the cost basis for the land? a. $90,600 b. $91,550 c. $88,150 d. $87,200 2. ...
November 5, 2009

Social Studies
What was the relationship between the rise of capitalism and the temperance movement? I have read and read online and in books and still not sure of the answer.
November 5, 2009

Biology
Can you explain this question A person who has been sunbathing all day eats a salts tablet.
November 4, 2009

Biology
What effect does cooking have on liquid protein
November 3, 2009

Biology
What effect does cooking have on sunflower oil.
November 3, 2009

Probability
223
November 2, 2009

physics
In the ideal apparatus m1=2.0 kg. What is m2 if both masses are at rest? How about if both masses are moving at constant velocity?
November 2, 2009

English
1. Today we eat foods/food which come from all over the world. (Do we have to use 'food' or 'foods'? Are both OK? When do we use 'foods'? 2. I like healthy food. 3. I like health food. 4. I like healthy foods. 5. I like health foods. (Which ones are ...
October 28, 2009

English
1. He is helping an old man get on the bus. 2. He is helping an old man get onto the bus. (Which preposition do I have to use? are both OK?) 3. Look at the picture. He is trembling because of cold. It is winter. It is windy as well. Look at the bare (naked, leafless) tree. ...
October 28, 2009

English
1. Because she will come here, I will meet her. 2. Because she comes here, I will meet her. 3. As she will come here, I will meet her. 4. As she comes here, I will meet her. (Which one is grammatical?)
October 28, 2009

English
1. Meeting her, I will be very glad. 2. When I meet her, I will be very glad. 3. If I meet her, I will be very glad. 4. As I meet her, I will be very glad. 5. As I will meet her, I will be very glad. (Are they all the same? Which one is correct, #4 or #5?)
October 28, 2009

English
1. Where is there a candy striper? 2. Where can we see a candy striper? 3. Where is a candy striper from? 4. Where does a candy striper live? 5. What does a candy striper wear? 6. What clothes does a candy striper wear? 7. What kind of clothing does a candy striper wear? 8. ...
October 28, 2009

English
I have pictures of national flags of six countries. Which national flag is French natonal flag? Which country's national flag is this picture? Which national flag is related to French? Which national flag is French's. I want you to find Chinese national flag. Will you ...
October 28, 2009

English
Looking for interesting volunteer work? How about cleaning at a city hall. People of the city hall needs your help. You can be very useful there! Where: Washington City Hall When: every Friday Tel 011-123-4567 (Are the poster for volunteers grammatical? Would you like to take ...
October 27, 2009

English
Looking for interesting volunteer work? How about taking children at an orphanage? Children are wating for yor help. You can be their friend! Where: at Chicago Orphanage When: every Sunday Tel 051-123-4567 (Are the poster for volunteers grammatical? Would you like to take a ...
October 27, 2009

English
Let's work in pairs. Say the specialty of your friend you know well to your partner. Use the following pattern. * I have a friend who ___________. For example, if one of your friends swims very well, say to your partner,"I have a friend who can swim very well." ...
October 26, 2009

English
1. They wear pink and white stripe uniforms. 2. They wear pink and white striped uniforms. (Which one is correct? Are both OK?)
October 26, 2009

English
1. Candy stripers are teenage volunteers at hospitals. (What is the meaning of 'stripers' in the sentence?) 2. She also takes sick children outside in wheelchairs. 3. She also takes sick children out in wheelchairs. 4. She also takes out sick children in wheelchairs. 5...
October 26, 2009

English
1. He works at/in the library. 2. He works at/in the town hall. 3. He works at/in the hospital. (Which preposition do I have to use? Are both OK? Which one is popular?) 4. I want to drink iced tea. 5. I want to drink ice tea. 6. I want to drink an iced tea. 7. I want to drink ...
October 26, 2009

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