Monday

September 1, 2014

September 1, 2014

Number of results: 3,948

**com 150**

elect one of the essays from the Examples of Effective Introductions section in Effective Introductions and Conclusions. Which article did you choose? What type of introduction does the writer use? What is the impact of that kind of introduction in this essay?
*March 24, 2010 by King*

**math(urgent)**

$1000 was invested for two years at 10% simple interest .calculate the effective rate was earned. pls check my solve (1+0.1/2)^2-1 = 0.1025 but the true answer is 9.54% pls help me to get the formula of effective rate
*May 16, 2014 by fizz*

**effective listening**

Your friend and you are discussing what you’re learning and one of them says the following: “Effective listening? There’s nothing to it! You just sit there and listen. And anyway, it’s passive – it doesn’t take any energy or concentration." What would you say to what your ...
*January 22, 2012 by 12-year-old-poet*

**math**

what is the effective rate formula? There are numerous effective rate formulas in math. You will need to be more specific.
*October 12, 2006 by no name*

**research writing**

Create a full sentence outline that includes effective argument and counterarguments to support my thesis on Teen Depression and Suicide. Where did you place the most effective arguments in your paper? Explain How did you address counterarguments without weakening your own ...
*May 22, 2009 by missy*

**math**

What models can be used to help explain the concepts of addition and subtraction of rational numbers? What are the benefits to using such a model? What limitations does the model have? Create an addition or subtraction problem and demonstrate how the model might work. ...
*October 26, 2010 by glenn*

**HCA 311**

Metropolis currently has $1,150,000 in cash. How long would it take them to accumulate $2,000,000 in cash? Assume an interest rate of 5 percent.
*September 10, 2012 by Cindy*

**Chemistry**

At 298K, 2PCl3(g)+O2(g)---> 2POCl3(l) Delta H= -620.2kJ for the reaction and the standard molar entropies are ,PCl3(g)= 311.8J/K,O2(g)= 205.1J/K and POCl3(l)=222.4J/K. Determine the standard free energy change at 298K.
*April 15, 2011 by PM221*

**Statistics**

True or False Question. I need help please. A sientific paper reports the results of a drug test. This medicine used to reduce vision loss in people suffering from macular degeneration. The article state p = 0,04 section findings. The following issues are of three different ...
*July 22, 2013 by Andrew*

**Mrs. SUe**

Curiousity; Do you get paid for all for all of this hard work that you do??? BEcuase you are always on helping all students on a ton of subjects.. I really appreciate what you do and you deserve to get paid for all the students you are really helping, without giving them the ...
*May 28, 2009 by Sarah*

**business Math**

You were offered the opportunity to purchase either a simple interest note or a simple discount note with the following terms: $33,353 at 7% for 18 months. a. Calculate the effective interest rate. (Do not round intermediate calculations. Round your final answer to the ...
*April 7, 2014 by marie*

**Human Resource Management**

My question says, " Identify and discuss the elements of an effective appraisal system" I am having a hard time finding that anywhere in my book. I have found the characteristics of an effective appraisal system, but I do not know if that is the same. Thanks in advance for ...
*May 6, 2008 by Brandi*

**CJA/363 **

Due Week 1 Day 5 (Due Saturday) Please post your response to the following discussion questions by clicking Reply. 1. What is an example of an effective presentation within the criminal justice system? How does an effective presentation relate to effective communication among ...
*June 28, 2010 by Florence*

**Science**

1) Why do scientists use models?(1point) Scientists use models to learn about things that are too small, too large, or to complex to observe directly. Scientists use models because doing so is always part of the scientific method. Scientists use models because they work ...
*September 19, 2013 by Gabby*

**Quadratic Equations**

I couldn't find the sets of factors that add up to -13 in this problem. Plz help, anything is greatly appreciated! x^2-13x+36 Thx for helping ppl! you could use the quad. eqn which is -b plus or munus sq root of b squared minus 4 ac all over 2 a That is a good idea but I need ...
*February 12, 2007 by Emily*

**chem**

mass of element = 311.1269 amu what is mass of 1.36 moles of these atoms in g Hint: (1 mol = 6.022 x 1023 atoms) and (1 amu = 1.6606 x 10-24 g) HELP!
*October 15, 2007 by Mike*

**English**

One last question for today that I need checked. What can you assume about the effective-ness of the efforts of Dutch resistance work-ers to sabotate the Nazis? I just put it was very effective, but I feel that it's asking for more in the question, and maybe I'm just ...
*June 28, 2011 by Court*

**art**

Select one of the essays from the Examples of Effective Conclusions section in Effective Introductions and Conclusions. Which article did you choose? What kind of conclusion does the writer use? What is the impact of that kind of conclusion in this essay?
*August 20, 2009 by Anonymous*

**english**

What if anything, is wrong with the following sentence? The new drug proved to be highly effective, it has no side effect. a. Comma splice b. Properly constructed sentence. c. Lacks parallel parts d. Has unclear pronoun This is an example of a comma splice. You have two ...
*August 5, 2007 by ds*

**Discussion Question 2**

Select one of the essays from the Examples of Effective Conclusions section in Effective Introductions and Conclusions. Which article did you choose? What kind of conclusion does the writer use? What is the impact of that kind of conclusion in this essay?
*August 20, 2009 by Anonymous*

**ENGLISHH 12**

"The Rime of the Ancient Mariner" is famous for its use of vivid figurative language and memorable sound devices. What do you think are several especially effective examples of simile, metaphor, personification, alliteration, assonance, and internal rhyme? Explain why you ...
*May 5, 2012 by CHEYANNE MARIE*

**englidsh**

"The Rime of the Ancient Mariner" is famous for its use of vivid figurative language and memorable sound devices. What do you think are several especially effective examples of simile, metaphor, personification, alliteration, assonance, and internal rhyme? Explain why you ...
*May 6, 2012 by CHEYANNE MARIE*

**english**

tell me whats wrong with this sentence 'The teacher should have taken more time.' teacher- subject should- helping verb have- helping verb taken- action verb
*December 8, 2009 by christina*

**Statistics**

A research article reports the results of a drug test. This medicine used to reduce vision loss in people suffering from macular degeneration. The article state p = 0,04 section findings. The following issues are of three different interpretations of this value p. Note which ...
*July 19, 2013 by Andrew*

**math**

find the effectivee rate correspoding to 3% compounded quarterly The formula for effective rate I found is (1+ i/n)^n - 1 where i is the annual rate as a decimal and n is the number of periods. Here i=.03 so the effective rate is and n is 4 since there are 4 compounding ...
*September 19, 2006 by john*

**Algebra 2**

Problem Solving - A manufacturer of cell phones makes a profit of $25 on a deluxe model and $30 on a standard model. The company wishes to produce at least 80 deluxe models and at least 100 standard models per day. To maintain high quality, the daily production should not ...
*December 13, 2009 by LeLe*

**Chemistry**

Calculate the percent ionization of nitrous acid in a solution that is 0.311 M in nitrous acid (HNO2) and 0.189 M in potassium nitrite (KNO2). The acid dissociation constant of nitrous acid is 4.50 × 10-4.
*November 17, 2012 by Josh G.*

**aptitude **

The digits of a three digit number A are written in the reverse order to form another three digit number B. If B > A and B – A is perfectly divisible by 7, then which of the following is necessarily true? 1. 100 < A < 299 2. 106 < A < 305 3. 112 < A < 311 ...
*May 9, 2013 by amit sharma*

**math help plz!**

DigiCom wants to drop the effective rate of interest on its credit card by 2%. If it currently charges a nominal rate of 8% compounded daily, at what value should it set the new nominal rate? Note: Please make sure your final answer(s) are in percentage form and are accurate ...
*March 27, 2010 by Amy*

**chemistry help!!**

For each of the following pairs, indicate which element has the larger first ionization energy Mg or Al. i put Mg. Repulsion of paired electrons in Mg is more significant than Al's higher effective nuclear charge. but got it wrong. Al. Repulsion of paired electrons in Al is ...
*November 20, 2012 by Samantha*

**Fisher projections**

Is there a good tutorial that you know of on Fisher projections? My book isn't helpful. Thanks from Sheryl http://www.bluffton.edu/~bergerd/Models/chiral6.html I don't have the right plug-in for this lesson and I can't find it. Is there another tutorial that I can access? ...
*November 1, 2006 by Sheryl*

**Unit 4 - Memory, Thinking, and Intelligence**

research Spearman's Model of Intelligence and Gardner's Multiple Intelligences. Based on your findings, compare and contrast the two models. Provide several comparisons and several contrasts. Which of the two models do you feel is more in line with psychology today? Support ...
*September 21, 2006 by candy*

**Chemistry **

You work for a nuclear company and you want to separate out radioactive carbon from the soil sample. You calculate that you should get out 351.2g of carbon from your reaction but in the lab you only weigh out 311.7g after the procedure is finish. Is there any reason to worry ...
*February 21, 2012 by Bashu*

**Business **

which statement is false about Globaliztion? Free markets are effective than government rules or national boundries are increasing in importance. I think its A, that free markets are more effective than government rules.
*October 30, 2011 by Bryan*

**US History**

Evaluate the extent to which the Articles of Confederation were effective in solving the problems that confronted the new nation. After the revolution, this gave the states freedom and independence. There was a comitee of delegates of representatives from each state. Maybe ...
*December 16, 2008 by mw*

**help please:)**

All of the following statements about skimming are true EXCEPT: A. skimming is not an effective techniques for retaining information . B. it does not require attentive reading C. skimming is an effective techniques for identifying the main idea D. Most of the reading you'll do...
*September 25, 2011 by ciara*

**American Literature**

I amd writing a paper over how mark twain uses satire to criticize religion. My opening statement is: Helping a slave runaway and floating down the Mississippi river accompanied by two conmen appears to be the basis of a real adventure tale. My teacher has asked me to ...
*December 17, 2008 by Alan*

**Enghlish**

Explain effective practices for developing a topic sentence.Explain effective means for writing a paragraph.Summary,Anlysis,synthesis,and Evalution.Identify the role of reading in the writing process.identify the differences between summarizing,analysis,synthesis,and ...
*February 8, 2011 by Sanghai Sherman*

**Enghlish**

Explain effective practices for developing a topic sentence.Explain effective means for writing a paragraph.Summary,Anlysis,synthesis,and Evalution.Identify the role of reading in the writing process.identify the differences between summarizing,analysis,synthesis,and ...
*February 8, 2011 by Sanghai Sherman*

**Algebra**

This is a concept check on quadratic equation application. I am having trouble with a couple of parts. If anyone can help I would appreciate it. Suppose you are an event coordinator for a large performance theater. You need to supply information about projected ticket sales to...
*August 29, 2011 by Aria*

**statistics**

Finish times (to the nearest hour) for 59 dogsled teams are shown below. Draw a histogram. Use five classes. 261 269 236 244 280 296 284 297 290 290 247 256 338 360 341 333 261 267 287 296 313 311 309 309 299 303 277 283 304 305 286 290 286 287 297 299 332 330 309 326 309 326 ...
*December 19, 2010 by Kim*

**Math**

Hudson is already 40 miles away from home on his drive back to college. He is driving 65 mi/hr. Write an equation that models the total distance d travelled after hours h. What is the graph of the equation. When Phil started his new job, he owed the company $65 for his ...
*October 11, 2012 by Maia*

**physics**

A student, instead of using the effective mass for Si (1.18∗m(e)), uses the effective mass in Ge (0.22∗m(e)) to calculate density of states in Si. The student of course gets the wrong values. What is the ratio of the student's answer compared to the right answer?
*December 21, 2013 by Henry III*

**Business finance**

In a discount interest loan, you pay the interest payment up front. For example, if a 1-year loan is stated as $10,000 and the interest rate is 10 percent, the borrower “pays” 0.10 x $10,000 = $1,000 immediately, thereby receiving net funds of $9,000 and repaying $10,000 in a...
*January 10, 2011 by Bryan*

**AP Chemistry**

In a ﬁt of boredom, a chemistry teaching assistant swallows a small piece of solid dry ice (CO2). The 8.9 g of dry ice are converted very quickly into gas at 311 K. Assuming the TA’s stomach has a volume of 1.5 L, what pressure is exerted on his stomach?
*January 16, 2013 by Jose*

**critical thinking ( is it correct)**

It’s a deductive argument. Because all its premises are true (Many universities have begun using I<Clicker 2 to capture student response information in the classroom, and 94% of users agree that the product is effective or extremely effective) then its conclusion must be ...
*December 16, 2011 by anon *

**Chemistry**

To prepare an effective buffer in a PH range less than 7 ,it is advisable to select a weak acid-conjugate base pair in which the pK(a) of the weak acid equals the desired PH (+-)1 Over what PH range is the acetic acid-acetate ion buffer most effective ?K(HC2H3O2)=1.8x10^-5 ...
*October 23, 2011 by Queenking*

**Effective Business Communication**

For effective, written business communication, writers must consider several factors: the purpose of the communication, the identity of the audience members (including their probable reactions, amount of information they already have, obstacles that must be overcome, and ...
*May 5, 2009 by shirley*

**math**

If you add two-thirds of a number to the number itself, you get 40. What is the number? I do not know how to set it up? 2/3n + n = 40 Solve for n. I don't know but thak you sooooooooooo much for helping me on my mixed #'s!!!!!!!! Good Luck!!!!!! I don't know but thak you ...
*February 7, 2007 by catalina*

**Psychology**

What are psychoanalytical models?
*August 27, 2011 by Maple C.*

**Math**

In 3 minutes I can type 192 words. and in 5 minutes I can type 311 minutes. Find how many words I can type per minute. Help please.
*February 12, 2014 by Melanie*

**Math**

Here is the my problem: Pam used front-end estimation and adds 345, 311, 418 as 900+(50+10+20) to get the answer 980. Pat rounds the number and adds 350+200+400 to get 950. Who has the better answer? I say Pam because she is only 6 away from the actual answer of 974.
*June 21, 2009 by B.B.*

**Biology!!!**

The female mosquito is an effective vector for malaria. What makes it an effective vector? 1. it has wings 2. it lays many eggs 3. it makes noticeable noise 4. it mates several times I wrote the answer as B, but the answer as told on my assessment book says A, (which doesnt ...
*October 12, 2009 by Marrion*

**Thanks Tutors**

To all the tutors here, i know i was suppose to ask a question from my homework, and this is a homework website, but i like to thank you for helping me with my homework for the past few months. With you guys help, i got 100% on my math test and spelling!and the other test that...
*June 22, 2012 by Losa*

**economics**

Picabo borrows $1,000. To repay the amount she makes 12 equal monthly payments of $90.30. Determine the following: (a) The effective monthly interest rate (b) The nominal annual interest rate (c) The effective annual interest rate
*February 1, 2012 by Anonymous*

**End behavior models**

Thanks for the help with my previous problems Roger & Leo. It was really helpful. Now I want to know how to find the right and left end behavior models and horizontal tangents for the inverse functions, say y = tan inverse(x) I have to do this for all functions, but at least ...
*October 20, 2006 by Jen*

**algebra 2 **

The label on a prescription bottle directs the patient to take the medicine twice a day. The effective ingredient of the medicine decreases continuously at a rate of 25% per hour. If a dose of medicine containing 1 milligram of the effective ingredient is taken, how much is ...
*December 20, 2012 by Dee*

**algebra**

creat a graph for the function that models the percentage of adulat height attained by a boy who is years old. then creat a graph for the function that models the percentage of adulat height attained by a girl who is years old.
*March 10, 2013 by louise*

**Algebra**

Posted by Aria on Monday, August 29, 2011 at 2:58pm. This is a concept check on quadratic equation application. I am having trouble with a couple of parts. If anyone can help I would appreciate it. Suppose you are an event coordinator for a large performance theater. You need ...
*August 29, 2011 by Aria*

**business communications**

What strategies may you use to incorporate effective visual elements into business presentations? When have you ever sat through a presentation that used visual elements ineffectively? What tips would you give that presenter, knowing what you you now know about effective use ...
*November 9, 2009 by charlotte*

**Math Models**

Are the functions y-5=6(x-3) and y=6x-13 equal?
*May 3, 2012 by Dylan*

**Physical science**

Why are models important?
*June 30, 2013 by sandy*

**Actuarial Math**

The sum of the accumulated value of 1 at the end of four years at a certain effective rate of interest, and the present value of 1 to be paid at the end of four years at an effective rate of discount numerically equal to I is 2.0098 Find the rate
*October 11, 2010 by Summer*

**Current Topics in Information Technology**

4. Internet has a big impact on firms and their information systems. Firms created new business models that were not possible before the internet. Select one those new business models and answer the following questions: 4.1. What was the original business model for that ...
*September 22, 2012 by fawaz*

**Enlgish**

I have to write a 1000 word essay on how I am going to be effective, today, tomorrow and for the rest of my life. What are some qualities and stuff to be effective? Think about -- honesty, hard work, common sense, values, intelligence, knowledge, love, tolerance, cooperation, ...
*April 22, 2007 by Tess*

**Math**

If I I'm trying to find the average weight of a 2nd grade girl which would be the most effective and why? Mean, Median or Mode? If I'm trying to find the average cost of a home in a city which would be the most effective and why? Mean, Median or Mode? If I'm trying to find the...
*November 5, 2013 by Anonymous*

**Chemistry**

Window cleaner contains ammonium hydroxide. A 10.00 mL sample of window cleaner is titrated with 38.5 mL of 0.311 M hydrochloric acid. what is the molarity of the ammonium hydroxide in the window cleaner?
*August 5, 2013 by Colby*

**qualities of persuasive business messages**

How do you organizing information in informative, positive, negative, and persuasive messages? Assuming that the audience is not in favor of the change, the message is most effective when the pro agruments are given fist, then the con arguments followed by the anti-con ...
*January 15, 2007 by Letitia*

**Calc**

How much money will we have in 6 months if we invest $1000 into an account earning 8% compounded continuously? How long will it take the $1000 to double? What is the effective rate for 8% compounded continuously that would produce the same accumulated amount after 1 year as 8...
*July 15, 2012 by Rita*

**management**

Contrast the two models of social responsibility
*September 25, 2010 by RT*

**Models for Health and Wellnesses**

What do I answer? Where do I go for a list of questions?
*April 11, 2011 by Flora*

**algebra**

write an equation that models the relationship between x and y. x= 1, 2, 3, 4, 5, Y= 2 21/2 31/2 4
*September 29, 2011 by Anonymous*

**Statistics **

Normal distribution models what type of variable??
*May 7, 2012 by Nichole*

**Finance**

A comp. has issued a bond with the following characteristics: Principal=1000, Time to maturity=20yrs. Coupon Rate=8%, compounded semiannually with semiannual payments. Calculate the value of this bond if the stated interest rate, compounded semiannually is 6% My attempt: 1000...
*March 11, 2008 by Teresa*

**socials**

what is the use of human development index? ranks its member countries according to three measures: adult literacy, life expectancy, and the per capita GDP. i not really understand that definition and i not know how effective it is in high lighting the differnces between rich ...
*January 11, 2012 by Mohammad*

**Business**

I was asked to articulate what I feel are good traits of effective organization, as well as describe how I think culture affects the ability to handel change. I replied with a 350 word response, in my response i stated the "...culturally responsive; this leads way to the ...
*May 6, 2011 by joe*

**E-mail Advertising**

E-mail advertising is claimed to be very effective for vial marketing purposes – that is, buzz generation. This is accomplished by requesting an e-mail recipient to forward the message to a friend. Present your views on the effectiveness of the e-mail viral marketing practice...
*January 7, 2008 by Fantasy*

**law,help**

any suggestions will really help or ideas....thanks .... Which is more effective, street justice by police or processing juveniles through the court system? It depends on what you mean by street justice. If you mean early intervention in neighborhoods, it yas proven effective...
*March 8, 2007 by kyln*

**criminal justice**

a 700- to 1,050-word essay in APA format on the qualities of effectiveness versus ineffectiveness of judges. In your essay o Describe the responsibilities of judges. o Identify attributes of both effective and ineffective judges. o Provide an example of an effective and an ...
*November 21, 2009 by Anonymous*

**COM 220**

• Create a full-sentence outline that includes effective arguments and counterarguments to support your thesis. (Note: Outline only the body of your paper.) Remember to avoid bias and fallacies and to include rhetorical devices that strengthen your writing. • Answer the ...
*October 17, 2008 by MIKE T*

**math**

Choose the one alternative that best completes the statement or answers the question. Find the probability. The table describes the smoking habits of a group of asthma sufferers. |Non|Light|Heavy|Total Men| 311| 82 | 74 |467 Women| 329| 68 | 60 |457 Total| 640|150 |130 |924 If...
*September 2, 2010 by Sarah*

**Math 10**

Myrtle throws a ball upward from a second-floor balcony, 6 m above the ground with an initial velocity of 2 m/s. In this situation, u = 2 and ho = 6, so the relation that models the height of the ball is h = -5t2 + 2t + 6. Myrtle knows that changing the velocity with which she...
*May 8, 2014 by Kitty *

**Chemistry**

I got questions about catalytic converter. Can someone please help me out? Thanks in advance 1. Why is it necessarty to have additional air in exhaust before it enters the catalytic converter? 2. A catalytic converter is not effective when cold. Use the concept of activation ...
*April 11, 2009 by Anonymous*

**math**

also, what formula would i have to use for this: Effective Rate An advertisement for E*TRADE bank boasted "We're ahead of banks that had a 160-yr start," with an APY (or effective rate) of 2.01%.* The actual rate was not stated. Given that interest was compounded monthly, find...
*June 19, 2007 by student*

**human services**

what would be some examples for theoretical models?
*August 31, 2007 by alley*

**math models**

What is the classification for this polynomial? 4g^2h^4j^2+3g^6h^8 A. monomial B. binomial C. trinomial
*October 6, 2010 by jackie*

**math models**

What is the classification for this polynomial? 4g^2h^4j^2+3g^6h^8 A. monomial B. binomial C. trinomial
*October 6, 2010 by jackie*

**child psychology**

Connectionists models provide evidence that? Please help!
*March 19, 2012 by sarah*

**math**

Multiply using Area Models – Draw the model a. 1/3 x 4/5 b. 3/4 x 1/5
*July 22, 2012 by rick*

**English**

Teen Pregnancy • Create a full-sentence outline that includes effective arguments and counterarguments to support your thesis. (Note: Outline only the body of your paper.) Remember to avoid bias and fallacies and to include rhetorical devices that strengthen your writing. • ...
*September 10, 2008 by Kandi*

**Finance (Check Answer plz)**

A comp. has issued a bond with the following characteristics: Principal=1000, Time to maturity=20yrs. Coupon Rate=8%, compounded semiannually with semiannual payments. Calculate the value of this bond if the stated interest rate, compounded semiannually is 6% My attempt: 1000...
*March 11, 2008 by Teresa*

**Finance (Check Answer plz)**

A comp. has issued a bond with the following characteristics: Principal=1000, Time to maturity=20yrs. Coupon Rate=8%, compounded semiannually with semiannual payments. Calculate the value of this bond if the stated interest rate, compounded semiannually is 6% My attempt: 1000...
*March 12, 2008 by Teresa*

**Algebra 1 **

1). Last week, the ratio of laptops to desktops sold at a computer store was 2:3. Eighteen desktop models were sold. How many laptop models were sold? A: 12 laptop models were sold. 2). Find the unite rate: twenty-six crackers contain 150 Calories. A: 6 3). Solve the ...
*October 2, 2013 by Anonymous*

**Calculus**

Part of a circuit has two resistors connected in parallel as shown in the figure. R(1) is a constant resistor of 10 ohm, while R(2) is a variable resistor with resistance that varies at a rate of 2 ohms per minute. The total, or effective, resistance, R, provided by this ...
*July 29, 2011 by Cynthia*

**calculus**

Part of a circuit has two resistors connected in parallel as shown in the figure. R(1) is a constant resistor of 10 ohm, while R(2) is a variable resistor with resistance that varies at a rate of 2 ohms per minute. The total, or effective, resistance, R, provided by this ...
*July 29, 2011 by NEED HELP NOW!*

**grammer**

I have learning how prepare for an effective meeting. For an effective meeting you must invite a neutral facilter to sensitive meeting, only hold a meeting if necessary , an meeting must have clear objectives , all meeting have an agenda which includes: topic for discussion...
*December 20, 2011 by hiop*

**grammar**

I have learning how prepare for an effective meeting. For an effective meeting you must invite a neutral facilter to sensitive meeting, only hold a meeting if necessary , an meeting must have clear objectives , all meeting have an agenda which includes: topic for discussion...
*December 20, 2011 by hiop*

**soc 120**

5. The Ford Pinto case demonstrated that (Points : 1) it was cost-effective in the long run to allow purchasers to die. it was cost-effective in the short run to allow purchasers to die. accountants should not be trusted. the Pinto was Ford's best product.
*July 1, 2012 by bob johnson*

**geometry**

Find a function that models the area A of a circle in terms of its circumference C.
*October 8, 2009 by David*

**Science**

Why do scientists use models to study the movement of Earth and its moon?
*February 9, 2011 by Nalla*

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