Friday

January 30, 2015

January 30, 2015

Total # Posts: 522

**science**

what is the concentration of a solution made by mixing 22.0 g of salt with 200 mL of water? assume that the volume of the water does not change when the salt is added
*January 14, 2015*

**physics**

A motorcross racer covers one lap of a 1200 meter track on his motorcycle at a speed of 27 meters per second. How long does it take to ride one lap: A. In seconds? B. In minutes?
*November 20, 2014*

**Chemistry**

Yes you are correct for the change to H3O^ But do I need the plug the 37 degrees in somewhere or is the response above the final answer?
*November 19, 2014*

**Calculus**

I don't see what you mean..Do you mean the 8th derivative of the function?
*November 11, 2014*

**Calculus**

Find the degree 3 Taylor polynomial approximation to the function f(x)=8ln(sec(x)) about the point a=0 .
*November 11, 2014*

**physics**

Bob fires a cannon horizontally off a 125 meter cliff.the cannonball leaves the cannon traveling at 144 meters per second. How far from the cliff will the cannonball land?
*November 10, 2014*

**Chemistry**

I am a parent trying to help with my childs homework. This is the question that has us stuck. Can you assist us? Boron trioxide B203 , reacts with waterto produce boric acid, B(OH)3. B2O3(s) + 3H2o (l) -> 2B(OH)3(s) Ricardo adds 27.2 g of B2O3 to an excess of h2O, and the ...
*November 4, 2014*

**Chemistry**

Not sure but this is what I came up with: molarity= mol/mL 26.7/342.15=.078=.78M
*October 29, 2014*

**Chemistry**

26.7g/100mL
*October 29, 2014*

**Chemistry**

The solubility of aluminum sulfate in water at 20degrees Celcius is 26.7g/100L. Calculate its molarity?
*October 29, 2014*

**Chemistry**

Haven't had any lectures on this yet. Can you please assist? thank you
*October 29, 2014*

**Chemistry**

A student reacted 0.500g of Pb(NO3)2 with 0.750g of KI according to the reaction, Pb(NO3)2(aq) + 2KI(aq)=PbI2(s) + 2KNO3(aq) A) How many moles of Pb(NO3)2 were used? B) How many moles of KI were used? C) How many moles of PbI2 would form, based on the moles of Pb(NO3)2 used? D...
*October 29, 2014*

**CHEMISTRY**

A student combusted 0.500g of purified aluminum power with excess oxygen in an oxygen atmosphere according to the reaction, 4Al(s) + 3O2(g)= 2Al2O3(s) A) What is the limiting reactant? B) How many moles of Al were used? C) How many moles of Al2O3 would form, based on the moles...
*October 29, 2014*

**Chemistry**

the solubility of aluminum sulfate in water at 20 degrees celcius is 26.7 g/100mL Calculate the molarity?
*October 28, 2014*

**Chemistry**

How many moles of magnesium are in Magnesium Chloride?
*October 25, 2014*

**Chemistry**

please HELP!! mass of magnesium chloride =.2 mass of chlorine in magnesium chloride =.1 A)moles of magnesium? B)moles of chlorine? C)moles of magnesium divided by the smaller number of moles? D)moles of chlorine divided by the smaller number of moles? E)experimental empirical ...
*October 25, 2014*

**Chemistry**

the solubility of aluminum sulfate in water at 20 degrees celcius is 26.7 g/100mL Calculate the molarity?
*October 24, 2014*

**Chemistry**

a compound of nitrogen and oxygen is 30.46% by mass N and 69.54% by mass O. the molar mass if the compound was determined to be 92g/mol. What is the empirical formula of the compound? What is the molecular formula of the compound?
*October 22, 2014*

**Chemistry**

Fe1.4O1.4 = FeO
*October 22, 2014*

**Chemistry**

When 6.25grams of pure iron are allowed to react with oxygen, a black oxide forms. If the products weighs 8.15g, what is empirical formula of the oxide?
*October 22, 2014*

**chem**

p in atm? 0.8atm = pO2 +0.031 0.8-0.031 = pO2 0.769atm = pO2 p in torr? 608 = pO2 + 23.8 608-23.8 = pO2 584.2 torr = pO2
*October 14, 2014*

**chem **

The total pressure in a vessel containing hydrogen collected over water at 25degrees Celsius was 0.8atm. the vapor pressure of water at the temperature is 23.8torr. What was the pressure of the oxygen in torr?
*October 14, 2014*

**chem**

T2 = 300K(3.00L/3.60L) = 250K or -27degrees Celsius
*October 14, 2014*

**chem **

The volume of a 3.60L sample of gas at 27degrees Celsius is reduced at constant pressure of 3.00L. What is the final temperature?
*October 14, 2014*

**chem**

V2=1.4L (450K/300K)=2.1L
*October 14, 2014*

**chem**

While the pressure of 1.40L of gas is kept constant, its temperature is increased from 27 degrees Celcius to 177 degrees Celcius, How do I calculate the new volume?
*October 14, 2014*

**chem**

Ammonia gas occupies a volume of 5.00L at 4.00 degrees celcius and 760 torr. what is the volume at 77degrees celcius and 800 torr?
*October 14, 2014*

**Math**

What are different strategies of finding all the factors of a number besides the rainbow method?
*September 15, 2014*

**Alg I**

when translating the verbal expression "five more than d" into an algebraic expression, is the answer 5+d or d+5? Aren't they the same?
*August 21, 2014*

**math**

A bathroom measures 250cm by 175cm.Calculate the side of the largest square tile that can be used to tile the floor without cutting.
*July 6, 2014*

**Math**

A living room measures 450cm by 330cm.Find the dimension of the largest tile that can be used to tile the floor without cutting.
*July 6, 2014*

**Math**

A cell phone company charges a monthly fee of $17.95 and $0.03 per minute Write an equation that represents the cost (c) for using the cell phone for minutes (m) Use your equation from part a to find the cost for using the phone for 150 minutes
*April 28, 2014*

**Math**

Mary has a container of sugar in the shape of a cylinder the container has a diameter of 10 inches and a height of 6 inches if the container is full how much will the sugar weigh if the average weight of the sugar is 0.2 ounces per cubic inch round to the nearest tenth
*April 28, 2014*

**Epidemiology**

A Case control study
*April 28, 2014*

**orgo chem**

how much acid will remain after 3 extractions with 1.0 mL of ether of 50mg butanoic acid, 5mL water?
*April 11, 2014*

**Physics**

A solid cylinder is mounted above the ground with its axis of rotation oriented horizontally. A rope is wound around the cylinder and its free end is attached to a block of mass 54.0 kg that rests on a platform. The cylinder has a mass of 265 kg and a radius of 0.430 m. Assume...
*April 10, 2014*

**Indian wells**

5/8 of the students in mr. Halls class got an A or B . Four times as many students got an A than a B. what fraction of Mr. Hall's class got an A.
*March 24, 2014*

**Math **

Determine if the lines L1 and L2 passing through the give pair of points are parallel, perpendicular, or neither. L1: (-2, -3), (1, 3) and L2: (4, 5), (-4, -11)
*February 20, 2014*

**Chemistry**

About 50% of U.S. and most Canadian sulfur is produced by the Claus process, in which sulfur is obtained from the H2S(g) that occurs in natural gas deposits or is produced when sulfur is removed from petroleum. The reactions are described by the equations 1)2H2S(g)+3O2(g)=2OS2...
*February 2, 2014*

**math**

the population of Knoxville is 500,000 and is increasing at the rate of 3.75% each year. Approximately when will the population reach 1 million?
*January 12, 2014*

**physics**

rank the average gravitational force from greatest to least between (a) sun and mars (b)sun and moon (c) sun and earth include an explanation PLEASE!!!!
*January 3, 2014*

**8th grade science**

thank you so much this has really helped me :))
*November 13, 2013*

**8th grade science**

Can someone please help me solve this question please because I'm having trouble with this question and can someone please explain to me how they got this answer? Thank you :D
*November 13, 2013*

**8th grade science**

Q: A person living in North America will be able to see 15 lunar eclipses in the 2010-2020 decade. In the same time period, only two solar eclipses can be observed in North America. why will more lunar eclipses than solar eclipses be visible from North America in this decade? ...
*November 13, 2013*

**Math **

maria works 8 hr shifts.she has earned 62.75 mins of sick time. how many sick days does she have
*October 5, 2013*

**Math **

maria works 8 hr shifts.she has earned 62.75 mins of sick time. how many sick days does she have
*September 30, 2013*

**Math **

maria works 8 hr shifts.she has earned 62.75 mins of sick time. how many sick days does she have
*September 30, 2013*

**Math**

There are 8 standard classifications of blood type. An examination for prospective laboratory technicians consists of having each candidate determine the type for 3 blood samples. How many different examinations can be given of no 2 of the samples provided for the candidate ...
*July 28, 2013*

**Math-probability**

A sporting goods store estmates that 20% of the students at a nearby university ski downhill and 15% ski cross country. Of those who ski downhill, 40% also ski cross country. What percentage of these students ski both down hill and cross country? Write as a decimal.
*July 27, 2013*

**Math- probability**

Suppose 80% of kids who visit a doctor have a fever, and 30% of kids with a fever have sore throats. What's the probability that a kid who goes to the doctor has a fever and a sore throat? Round to three decimal places.
*July 27, 2013*

**Math**

How do I figure capacity of a cupboard with shelves?
*July 24, 2013*

**Math**

Is capacity done the same way? I am confused about the difference between Volume and capacity. Thanks so much for your help!
*July 24, 2013*

**Math**

I need to do a project to figure capacity volume of a stationary cabinet with three shelves. I am confused about how to figure this with the shelves.
*July 24, 2013*

**physics**

A 9.90-kg box is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the box and the floor is 0.372. Determine the kinetic frictional force that acts on the box when the elevator is (a) stationary, (b) accelerating upward with an ...
*July 12, 2013*

**Pre-calculus**

Thank you so much!
*June 5, 2013*

**Pre-calculus**

Explain how the graph of f(x)=(-2)/(x-3)^2 can be obtained from the graph of y=1/x^2 by means of translations, compressions, expansions, or reflections.
*June 5, 2013*

**precalculus**

Explain how the graph of f(x)=(-2)/(x-3)^2 can be obtained from the graph of y=1/x^2 by means of translations, compressions, expansions, or reflections.
*June 4, 2013*

**Physics**

The left end of a 1-kg, 1.0 m long uniform thin rod is attached to a pivot, about which it can rotate freely. A force F is applied at the right end of the rod at 30 degree angle to hold the rod stationary in a horizontal position. What is the magnitude of the force F? I think ...
*April 21, 2013*

**Math**

What is the distance on the ground between 2 posts when the posts are attached to a platform that is 6 feet square and attached with 15 degree brackets? The posts are either 10 foot or 12 foot. Please answer for both.
*April 21, 2013*

**algebra**

Do you like roller coasters? If you were asked to design a roller coaster, what would it look like? Would it have steep hills? Would you design the tracks to go upside down? Did you know that polynomial equations are used by the structural engineers who design roller coasters ...
*April 16, 2013*

**Math**

28a^11b^7/4a^3b
*April 14, 2013*

**Algebra 2**

Find the value of $1000 deposited for 8 years in an account interest compounded semiannually.
*March 24, 2013*

**Physics**

Two people wearing skates facing each other. The 1st person is 75kg and pushes the second person 60 kg away at a speed of 2.0 m/s. What is the speed of the 1st person?
*March 23, 2013*

**psychology statistics for behavioral sciences**

A multiple-choice test has 48 questions, each with four response choices. If a student is simply guessing at the answers, a. What is the probability of guessing correctly for any question? b. On average, how many questions would a student get correct for the entire test? c. ...
*March 20, 2013*

**Quantum Physics**

Helpppp
*March 15, 2013*

**Quantum Physics**

Helppp
*March 11, 2013*

**chemistry**

For the reaction below, Kp = 1.16 at 800.°C. CaCO3(s) CaO(s) + CO2(g) If a 21.7-g sample of CaCO3 is put into a 10.6 L container and heated to 800°C, what percentage by mass of the CaCO3 will react to reach equilibrium?
*February 3, 2013*

**chemistry**

For the reaction below, Kp = 1.16 at 800.°C. CaCO3(s) CaO(s) + CO2(g) If a 21.7-g sample of CaCO3 is put into a 10.6 L container and heated to 800°C, what percentage by mass of the CaCO3 will react to reach equilibrium?
*February 3, 2013*

**statistics please**

a basketball scout randomly selected 144 players and timed howlong eah player took to perform a certain drill. the times in thissample were distributed with a mean of 8 minutes. the populationstandard deviation was known to be 3 minutes. (a) find the critical value for a 95% ...
*December 15, 2012*

**spanish**

(sus)libros (su) (nuestra)
*December 15, 2012*

**statistics**

experience in investigating insurance claims show that the averagecost to process a claim is approximately normally distributed witha mean of $80.new cost-cutting measures were started and a sampleof 25 claims was tested .the sample mean of the costs to processthese claims was...
*December 15, 2012*

**Math, Algrebra II High school**

You have 29 coins, the total value of which is $1.77. The number of quarter is eight less than the number of pennies and the rest are nickels. How many of each coin do you have?
*December 14, 2012*

**Algebra II math high school **

To get the necessary funds for a planned expansion, a small company took out three loans totaling $25,000. The company was able to borrow some money at 8%. It borrowed $2000 more than half the amount of the 8% loan at 10% and the rest at 9%. The total annual interest was $2200...
*December 13, 2012*

**Math Algebra , high school **

A biologist has three salt solutions: some 5% solution, some 15% solution, and some 25% solution. She needs to mix some of each to get 50 liters of 20% solution. She wants to us twice as much of the 5% solution as the 15% solution. How much of each solution should she use? How...
*December 13, 2012*

**statistics please**

yes you did Thank you...!!!!!
*December 12, 2012*

**statistics please**

Experience in investigating insurance claims shows that the average cost to process a claim is approximately normally distributed with a mean of $80. New cost-cutting measures were started and a sample of 25 claims was tested. The sample mean of the costs to process these ...
*December 12, 2012*

**statistics**

thank you....!!!
*December 5, 2012*

**social studies**

how to write a song about american culture
*November 29, 2012*

**Human Resources**

Consider the fact that during the past few years, many firms have laid off thousands of workers, frozen employee pay and eliminated or reduced bonuses. Yet at the same time many of these firms have retained "key employees" and CEOs by giving them huge compensation ...
*November 19, 2012*

**maths**

a woman who is 5feet 4 inches cast a shadow that is 6 feet tall. how long of a shadow would be cast by a man who is 6 feet 8 inches tall
*November 5, 2012*

**English**

Thanks, they're all right!
*October 29, 2012*

**English**

I really need to get a WORKING charger for my phone. Participle or verb? I think it's a verb, but I'm really not sure.
*October 29, 2012*

**Statistics**

25 students test grades (possible scores 0 to 100)has a standard deviation of 15. What logically follows???
*October 10, 2012*

**finance 370**

How did they round this number off. Value debt310 million +110 value equity million=.738=73.8% Then Value Equity over Value Of Debt +Value of Equtiy $310 million + 110 million=0.262=26.7% How did they get these number
*October 4, 2012*

**Statistics - math**

Do you have an answer that I can check my calculations with? I haven't worked a problem like this in a long time - am trying to help a friend with this problem. We're having trouble calculating it. I'm using a regular calculator, not a scientific one. Any suggestions
*October 2, 2012*

**Statistics - math**

Each consumer has a 25% chance of preferring your product over the competitor's product. If we question 15 customers, what is the probability that at least 3 will prefer your product?
*October 2, 2012*

**Statistics - math**

The answer is supposed to be 0.04 + 0.25 + 0.42 + 0.24 = 0.95 However, when I do the math above, I get 0.01 + 0.03 + 0.04 + 0.04 = 0.12. Where am I making the error in calculating this?
*October 2, 2012*

**Statistics - math**

An urn contains 5 red balls and 10 white balls. 6 balls are randomly drawn and not replaced. What is the probability that 3 or fewer balls drawn are red?
*October 2, 2012*

**math**

so here's my edited work: 10^x = 65/2 xln10 = ln (65/2) xln10 = ln65 - ln2 x = ln65 - ln2 - ln 10 x = 1.17865~ , BUT when i check the original equation: x = log 32.5, x = 1.51188~ hmmm they don't match up. can someone please tell me where i'm going wrong?
*September 11, 2012*

**math**

ooopsss i think i know where i went wrong. it's supposed to be 10^x = 65/2 and then i apply the natural log to both sides.... lemme check..
*September 11, 2012*

**math**

how do i solve for x when x = log(32.5)? here's my work: log x = y 10^y = x then, x = log (32.5) 10^x = 32.5 10^x = 17/2 this is where i get stuck... i don't know how to get rid of the bases... can some one please teach me how? thank you! :)
*September 11, 2012*

**intermediate algebra**

Solve for w. S -2 LW divided by 2W plus 2L equals H
*August 28, 2012*

**Geometry**

You want to frame a picture that is 5 inches by 7 inches with a 1 inch wide frame. What is perimeter of outside edge of the frame.?
*August 21, 2012*

**early childhood education**

At What Age Does Exercise Begin To Result In Strength In Boys And Girls?
*June 16, 2012*

**Math (Simplest Radical Form)**

What is the 9th root of 64, in simplest radical form?
*June 15, 2012*

**Chemistry**

Hi, I need help with a chemistry question. Question: Iron ore is treated with carbon monoxide to extract and purify the iron. a) Calculate the minimum mass of carbon monoxide that must be ordered by a refining company for every metric tonne of iron ore that is processed.
*June 1, 2012*

**criminal justice**

What are the requirements and the mandates in pretrial measures required by law?
*May 20, 2012*

**financal problems**

Computing future value. Calculate the future value of a retirement account in which you deposit 2,000 a year for 30 years with an annual interest rate of 7 percent.
*April 24, 2012*

**financial planning problems**

During a job interview,Pam Thompson is offered a salary of 28,000.The company gives annual raises of 6 percent. What would be Pam's salary during her fifth year on the job?
*April 24, 2012*

**math**

A bike costs $117. This is $12 more than 3 times the amount Tom saved last month. How much money did Tom save last month? Write an equation, solve the problem. Equation: 12+3n= 117?
*April 23, 2012*

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