Saturday

June 25, 2016
Total # Posts: 2,499

**chemistry**

plan and design an experiment which would allow you to find the percentage by mass of copper in a sample of impure copper
*March 27, 2011*

**Chemistry**

A chemist mixes 100ml of H2O at 30 degrees Celsius and 56.0g of CaOin a calorimeter. The following reaction occurs" CaO(s) +H2O(l)--->Ca(OH)2(s) ΔH= -16.0 kcal/mol The heat capacity Ca(OH)2(s) is 19.2 cal/mol*degreeCelsius and the heat of vaporization of water is ...
*March 27, 2011*

**statistics**

An auditor of Health Maintenance Services reports 40 percent of policyholders 55 years and older submit a claim during the year. Fifteen policyholders are selected at random for company records. a)how many of the policyholders would you expect to have filed a claim within the ...
*March 26, 2011*

**statistics**

A study of checkout lines at the Safeway revealed that between 4-7pm on weekdays there is an average of 4 customers waiting in line. What is the probability that you visit that Safeway during this time period and... 1-no customers are waiting in line? 2-Four customers are ...
*March 26, 2011*

**Managerial Economics**

Are organizations more risk adverse or individuals more risk adverse? Is one more risk tolerant? Use economic theory to explain your position.
*March 24, 2011*

**math**

a rectangle is 7 ft by 9ft. a second is similar to the first with a perimeter of 260 ft. what are the dimensions of the second rectangle?
*March 23, 2011*

**Pre Calculus**

Find the measure of the central angle, in radians, given the area of the sector as 22.6 cm2 and a radius equal to 3.7 cm. Round your answer to the nearest tenth.
*March 23, 2011*

**PROBABILITY**

There are 100 patients in a hospital with a certain disease. Of these, 10 are selected to undergo a drug treatment that increases the percentage cured rate from 50 percent to 75 percent. What is the probability that the patient received a drug treatment if the patient is known...
*March 23, 2011*

**Pre Calculus**

Verify the identity: cos x + sin x tan x = sec x.
*March 23, 2011*

**accounting**

$36,000 PAYABLE AT THE END OF THE SEVENTH, EIGHT, NINTH, AND TENTH PERIODS AT 12%
*March 21, 2011*

**Us History**

whichever side has more facts to show that you know the stuff. The person grading it isn't looking at you opinion, but at the facts you have & how you've analyzed them. :)
*March 21, 2011*

**Chemistry **

A mixture of ethyne gas (C2H2) and methane gas (CH4) occupied a certain volume at a total pressure of 16.8 kPa. When the sample burned, the products were CO2 gas and H2O vapor. The CO2 was collected and its pressure found to be 25.2 kPa in the same volume and same temperature ...
*March 21, 2011*

**Science**

Need help with constructing a model of radioactive decay with popcorn kernals
*March 20, 2011*

**algebra**

Lisa studies 8 hrs. for a particular test and gets a score of 78. at this rate how many hours would she have to study to get a score of 98?
*March 19, 2011*

**english**

Do you think that films, in general, influence society or does society influence what is presented in films?
*March 18, 2011*

**sociology**

How can the three sociological perspectives (e.g., social functionalism, social conflict, and symbolic interaction) be used to conceptually understand multiculturalism?
*March 15, 2011*

**Early childhood**

School-age children generally develop writing skills in which sequence? A.Expressive writing,expository writing,story B.Exposity writing,story writing,expressive writing. C.Expressive writing,story writing,expository. Story writing,expository writing,expressive writing
*March 15, 2011*

**math college**

POST YOUR QUESTIONS AT ww w.ac eyou rcoll egec las sses . c o m
*March 14, 2011*

**science**

how many half-lives have passed if 87.5% of a substance has decomposed? how many if 99.999% has decomposed?
*March 14, 2011*

**math**

POST YOUR QUESTIONS AT ww w.ac eyou rcoll egec las sses . c o m
*March 9, 2011*

**statistic**

Given a normal population with ì = 40 and ó = 8, what is the probability of obtaining a sample mean between 39 and 41 for a sample of n = 16 scores?
*March 9, 2011*

**English**

POST YOUR QUESTIONS AT ww w.ac eyou rcoll egec las sses . c o m
*March 8, 2011*

**algebra**

write an equation for the line parallel to the x axis through the point 7,2
*March 8, 2011*

**statistics**

POST YOUR QUESTIONS AT ww w.ac eyou rcoll egec las sses . c o m
*March 6, 2011*

**Advance Finance**

The Howland Carpet Company has grown rapidly during the past 5 years. Recently, its commercial bank urged the company to consider increasing its permanent financing. Its bank loan under a line of credit has risen to $250,000, carrying an 8 percent interest rate. Howland has ...
*March 6, 2011*

**helppppp :)**

more than 7 points plzzzzz
*March 1, 2011*

**helppppp :)**

how can we help african people who is having a hard time with poverty? :)
*March 1, 2011*

**constellations;)**

could you tell me the story of aries?? i wantta knoww^^
*February 28, 2011*

**chemistry**

pH=11.1, so pOH is 14-11.1=2.9
*February 26, 2011*

**reimbursement methodology**

Differentiate between the official coding guidelines for using V codes in an inpatient and outpatient settong
*February 23, 2011*

**home economics**

compute the price elasticity of demand for paint and show calculations? If a gallon of paint went from 3.00 to 3.50 a gallon and the usage of paint drops from 35 gallons a month to 20 gallons a month.
*February 20, 2011*

**mathh help plzzz**

the perimeter of a rectangle is 3.5 times the legth. the width is 2.5cm less than the legth. what is the width?
*February 20, 2011*

**introduction to business**

During a recession, unmployment___________ while inflation.
*February 19, 2011*

**science check plzzzzzzzzzz**

if your computer uses 2.5A at 120V, how much will it cost to use the computer for 4 hours a day, seven days a week for two weeks? assume that the cost of electricity is $0.09 for every kWh*h of energy. i solved it like this way could you check of i got it right plzzz?? (C= E* ...
*February 17, 2011*

**science check plzzzzzzzzzz**

if your computer uses 2.5A at 120V, how much will it cost to use the computer for 4 hours a day, seven days a week for two weeks? assume that the cost of electricity is $0.09 for every kWh*h of energy. i solved it like this way could you check of i got it right plzzz?? (C= E* ...
*February 17, 2011*

**science check plzzzzzzzzzz**

if your computer uses 2.5A at 120V, how much will it cost to use the computer for 4 hours a day, seven days a week for two weeks? assume that the cost of electricity is $0.09 for every kWh*h of energy. i solved it like this way could you check of i got it right plzzz?? (C= E* ...
*February 16, 2011*

**maths**

maximise p=15x+10y
*February 16, 2011*

**math**

candie since u r ask to find the y coordinates then the coordinates given must be x so substitute the x values in the equation and solve example.place -9 for x annd solve u will get the frist y coordinate then -3 then 6 ok
*February 16, 2011*

**math**

maximise p=15x+10y
*February 16, 2011*

**math**

a negative + a negative =a negative answer ex.-+-=- -x-=+ -x+=- so -25+(-16)= -25-16=-41
*February 16, 2011*

**alg**

9x +5y=34 8x-2y=-2 solve by elimination
*February 15, 2011*

**alg**

9x +5y=34 8x-2y=-2 solve by elimination
*February 15, 2011*

**STATISTICS**

Private colleges and universities rely on money contributed by individuals and corporations for their operating expenses. Much of this money is put into a fund called an endowment, and the college spends only the interest earned by the fund. A recent survey of eight private ...
*February 15, 2011*

**math **

A student planning her curriculum for the upcoming year must select one of four business courses, one of four mathematics courses, two of ten elective courses, and either one of four history courses or one of four social science courses. How many different curricula are ...
*February 14, 2011*

**international business**

what effect might the economics socioeconomic forces wthin south korea have on a products potential
*February 14, 2011*

**Economics**

i also agree
*February 14, 2011*

**geometry**

If AB is opposite AC and AC is opposite AD , what can you conclude? Explain.
*February 14, 2011*

**helpppppp**

what role do insulators play in preventing electric shock?
*February 14, 2011*

**helpppp science 7**

what role do insulators play in preventing electric shock?
*February 13, 2011*

**helpppp science 7**

what role do insulators play in preventing electric shock?
*February 13, 2011*

**fin 200 **

i am really confused on what numbers to use to get the calculations on the 13 ratios
*February 10, 2011*

**fin 200 **

using the financial statements for the goodyear calendar company calulate the 13 basic ratios
*February 10, 2011*

**chemistry**

A 20.2g chunk of magnesium metal reacts with 13.7 g of oxygen gas to make magnesium oxide. Write the balance equation.
*February 9, 2011*

**Science/ Physics**

An airplane is traveling km/h in a direction 41.5 degrees west of north. (a) find the cmpopnets of the velocity in the northerly and westerly directions. (b) How far north and how far west has the plane traveled after 3.00 h?
*February 9, 2011*

**english**

can u find the climatic sentences in the poem Africa by David Diop
*February 9, 2011*

**management information system**

Thanks Ms. Sue
*February 8, 2011*

**management information system**

Is spyware ethical? why or why not?
*February 8, 2011*

**chemistry Please Help Dr.BOB**

Complete hydrolysis of 25 mM ethyl acetate in an enzyme (i.e., esterase)-catalyzed reaction is carried out in a 40 mM NaCl solution buffered by 0.2 M Tris-Cl, pH 9.1. What is the pH at the end of the reaction? (For Tris base, which is the abbreviation for Tris (hydroxymethyl) ...
*February 7, 2011*

**Calculus**

.00092
*February 6, 2011*

**algebra**

The length of the side of a rectagular desk is given by 9x-2y cm. The length of the front is given by 9x+2ycm. What is an algebriac expression for the area of the top of the rectangular desk? Including correct units
*February 3, 2011*

**algebra**

(x^8+8)(x^9-^2)
*February 1, 2011*

**algebra**

convert decimal notation 5.166x10-^8
*February 1, 2011*

**Algebra**

(4x^6)(-3x^9)(6x^7)
*February 1, 2011*

**3rd grade math hw help!**

How can I do 5 1/4 line segment
*January 31, 2011*

**Physics**

Two charged particles exert an electrostatic force of 8 N on each other. What will the magnitude of the electrostatic force be if the distance between the two charges is REDUCED to one-third of the original distance? Would you just have to multiply 8 by 9?
*January 31, 2011*

**3rd grade math**

Thanks for the suggestion. I think my son got the idea on what to do.
*January 30, 2011*

**3rd grade math**

What patterns help you divide? DRaw a picture or make a chart to show how to divide 1600 by 4. Give the quotient. We know the answer but having trouble to make a chart to show the outcome. Please help. Thanks in advance
*January 30, 2011*

**chemistry**

What is the number of grams of a solute for a 3L of a 2.5 M HCl solution???
*January 26, 2011*

**chemistry**

What is the number of grams of a solute for a 3L of a 2.5 M HCl solution???
*January 26, 2011*

**chemistry**

what is the molarity of a solution when you ha 2mole of ammonium chloride (AgNo3) in 1L?
*January 26, 2011*

**Intermediate Accounting**

I am having a hard time calculating this my question is On April 1, 2011, the company paid an insurance company $4,000 for a two-year fire insurance policy. The entire $4,000 was debited to insurance expense. How do I calculate?
*January 25, 2011*

**statistics**

For each of the following samples that were given an experimental treatment, test whether these samples represent populations that are different from the general population: (a) a sample of 10 with a mean of 44, (b) a sample of 1 with a mean of 48. The general population of ...
*January 24, 2011*

**statistics**

For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3.
*January 24, 2011*

**reimbursment methologies**

when coding late effects, the code for the what is usually sequenced first
*January 24, 2011*

**math**

To make 5 sets of curtains, when each set requires 2'1/3 yards, how many of material are needed ?
*January 18, 2011*

**physics**

A 15kg model plane flies horizontally at a constant speed of 12.5 m/s and the kinetic energy is 1171J and the potential energy is 3000J what is the new horizontal velocity? Please show work and explain.
*January 17, 2011*

**Business**

I am trying to write a 1500 words review of two articles that are discussing ethical perspectives or business ethics for two countries. Each article must contain info. on a different foreign country on a different continent; for example, if the first article you select ...
*January 16, 2011*

**Chemistry Lab**

Penicillin is an important antibiotic isolated from a type of mold. If you have 0.0468 g Penicillin, C14H20N2SO4MW = 31239 gmol , answer the following questions. A. How many moles of Penicillin do you have? B. What is the number of moles of nitrogen that are present? C. What ...
*January 11, 2011*

**math**

how to mixed #s or whole #s 18/7
*January 11, 2011*

**Science**

Which of the following are involved in the clotting process? 1. platelets 2. neutrophils 3. fibrinogen
*January 10, 2011*

**Science**

Improper functioning or regulation of which of the following might lead to poor regulation of the membrane permeability? 1. albumin 2. fibrinogen 3. platelets 4. lymphocytes 5. chloride ion levels
*January 10, 2011*

**language**

What is the adjective for the question, Some hawk's eyes are yellow.
*January 6, 2011*

**Math**

you use a rectangular piece of cardboard 20 in by 30 to construct a box. you square the sides x in. from each corner of the piece of cardboard and then fold up the sides to form the bottom. A. write a function A to represent the area of the base of the box in terms of x. B. ...
*January 4, 2011*

**MATH PRE-ALGEBRA**

yes! if it is addition or subtraction you have an open dot! if it multiplication or division than a closed dot!
*January 3, 2011*

**Algebra**

factor trinomial This is what I have so far dont know where to go from here 4h^2 + 8h - 5 (4h^2-2h) + (10h-5) 2h(h-5) + -5(2h-1) cant figure out what to do next
*January 1, 2011*

**Algebra**

I checked it and that is how it is on the worksheet I couldn't get it to work out either
*January 1, 2011*

**Math**

2 4/7
*December 29, 2010*

**us history**

what are the similarties and differences of philosophies in the Articals of confederation and the constitution
*December 28, 2010*

**physics**

20 Newtons
*December 28, 2010*

**geology**

... Refer to Figure 9.21 on p. 264 of the text. How would you determine the slope of the land surface in this figure?
*December 27, 2010*

**Chemistry **

I converted 22 min into second -lnx= 4.17E-4 *1320seconds -ln100 lnx=4.0547 x=E^4.0547 x=57.67 100-57.67=42.33%
*December 25, 2010*

**Chemistry **

The K comes from dividing it by 212seconds
*December 25, 2010*

**Chemistry **

k- 4.17E-4 A-ln100/27)/4.17E-4 t=52min B= (ln100/x)=4.17E-4*22 lnx=4.0547 e^94.0547)=57.667 100-57.667 =42% Thank you
*December 25, 2010*

**Chemistry **

The decomposition of ehtane, C_2H_6, is a first-order reaction. It is found that it takes 212seconds to decompose 0.00839M C_2H_6 to 0.00768M. A. How long in minutes will it take to decompose ethane so that 27% remain B. What percentage of ethane is decomposed after 22minutes?
*December 25, 2010*

**Chemitry **

Thank you
*December 25, 2010*

**Chemitry **

I understand how to get the Constant but I don't get how you know that it is a 17% increase?
*December 25, 2010*

**Chemitry **

If he activation energy of a reaction is 4.86Kj, then waht is the percent increase in the rate constant of a raction when the temperature is increased from 45 to 75C
*December 25, 2010*

**math**

If you add 9 to me and then subtract 6, you get 7. What am I?
*December 21, 2010*

**stastics**

I'm having a hard time with question, can someone help me? A random sample of medical files is used to estimate the proportion p of all people who have blood type B. If you have no preliminary estimate for p, how many medical files should you include in a random sample in ...
*December 19, 2010*

**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*