Sunday

June 26, 2016
Total # Posts: 2,500

**General Chemistry**

A cylinder with a movable piston contains 2.00g of helium,He, at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the volume was chanded from 2...
*June 20, 2012*

**General Chemistry**

A tank of oxygen is under a pressure of about 4.00 x 10^3 kPa. Express this pressure in millimeters of mercury.
*June 20, 2012*

**General Chemistry**

At STP, a 5.00L flask filled with air has a mass of 543.251g. The air in the flask is replaced with another gas and the mass of the flask is 566.107g. The density of air is 1.29g/L. What is the gas that replaced the air?
*June 20, 2012*

**General Chemistry**

A 230.0mL sample of a 0.275 M solution is left on a hot plate overnight; the following morning the solution is 1.50M. What volume of solvent has evaporated from the 0.275 M solution? a)42.2 mL b)63.3 mL c)187.8 mL d)230 mL e)272.2 mL
*June 20, 2012*

**General Chemistry**

If a 14.05g sample of a gas occupies 10.0L at STP, what is the molar mass of the gas at 125 degrees Celsius?
*June 20, 2012*

**General Chemistry**

What volume of oxygen gas at STP is needed to react with 5.06 mol of C2H4, according to the following equation C2H4 + 3O2 ----> 2CO2 + 2H2O
*June 20, 2012*

**Marketing**

Compete the break even point in dollars. Selling price = $2.00, Variable cost = $1.00, Fixed cost = $150,000
*June 20, 2012*

**help please :)**

Jamal currently earns $20,000 a year in gross wages. On January 1, he is due to receive a 2% COLA. What will his gross income be after the COLA takes effect? A. $19,600 B. $20,100 C. $20,400 D. $24,000 i got C.
*June 14, 2012*

**saving**

i got D.
*June 14, 2012*

**sa**

i got b.
*June 14, 2012*

**sa**

Which one of the following budget items would probably be considered a fixed expense? A. Entertainment B. Savings C. Clothing D. Insurance premiums
*June 14, 2012*

**Math**

The radius of circle A is 9 times greater than the radius of circle B. Which of the following statements is true? A.The area of circle B is 9 times greater than the area of circle A B.The area of circle A is 9 times greater than the area of circle B. C.The area of circle B is...
*June 13, 2012*

**quadratic equations**

6^2-8+41=
*June 11, 2012*

**maths and statistics**

A company manufactures a product. The total fixed costs are $75 and the variab cost per unity is $5. 1)find an expression for the total cost in terms of Q,the quantity produced
*June 8, 2012*

**algebra ll**

divide and simplify 5y-5/21 divided by y-1/33y
*June 6, 2012*

**ACC 205**

The cash balance in a company's general ledger and the bank's balance on the bank statement will generally be different because of the time lag in recording transactions. True or False
*June 1, 2012*

**Chemistry**

Why does scientist want to demostrate chemical bonding use models with colored balls to represent atoms. Balls arenot totally accurate. So why does scientist use them?
*May 23, 2012*

**algebra ll**

600(x^2+x+1) using the formula -b+/- sqrtb^-4ac/2a
*May 22, 2012*

**algebrall**

How do you solve 600x^2+600x+600=0
*May 22, 2012*

**Physics**

The appromiate mass of a comet X has been memasured. When comet X orbits the Sun 5000 years later it only has half it's previous mass. Approximately how many orbits of the Sun has the comet completed and what is the period of the comets orbit?
*May 17, 2012*

**Criminal justice**

You have read about many of the important players in the criminal justice process: judges, prosecutors, jury, etc. Which do you think are the most important and why? You don’t have to rank them, but explain who you believe would be in your top 3 and why.
*May 16, 2012*

**Accounting **

Prepare the income statement of Draper Consulting for the month ended Deceomber 31, 2012
*May 15, 2012*

**Physics**

A ball of mass 0.202 kg has a velocity of 1.54 m/s right; a ball of mass 0.298 kg has a velocity of 0.410 m/s left. They meet in a head-on elastic collision.
*May 14, 2012*

**science**

Patterns of punctuated equilibrium have been observed in some cases, but the debate between punctuated equilibrium and phyletic gradualism continues and provides interesting areas of research. Based on your research into the scientific process, what evidence do we see today ...
*May 11, 2012*

**Math**

Sam had 900 base ball cards and Tim has one- ninth as many. How many cards does Tim have?
*May 8, 2012*

**literature**

Tale of two cities Examine the theme of resurrection in the novel. Which characters are brought back to life and how? Is there any situation from which resurrection is impossible?
*May 6, 2012*

**marketing**

You have been approached by the makers of the Holo-Generator. The Holo-Generator is an innovative product that fits in the palm of your hand and plays three-dimensional music videos through sound and holographic images. This product has not yet been developed. The executive ...
*May 5, 2012*

**algebra **

how do you solve this rational equation s+4/su^2 + 6s+4/s^2u
*May 4, 2012*

**math**

Suppose that you are responsible for predicting the cost of constructing a new office building. You find that the first story costs 500 dollars per square meter of floor space, and the second story costs 600 dollars per square meter. Assume that the costs per square meter form...
*May 4, 2012*

**Statistics**

The serum cholesterol levels in men aged 18 to 24 are normally distributed with a mean of 178.1 and a standard deviation of 40.7. A group of 9 men aged 18 to 24 randomly selected. 1. Find the probability that there are at least 2 men in the group whose serum cholesterol level ...
*May 3, 2012*

**Statistics**

Assume X~N(1.2, 1.3). Find P(0.26<|X|<1.68)?
*May 3, 2012*

**Calculus**

An important problem in mathematics is that of root finding: that is, given a function f (x), finding any roots of f in an interval. Exact methods exist for many functions: • In the case of a linear function f (x) = ax + b, this is easy. – If a ≠ 0, then x = &#...
*May 3, 2012*

**calculus**

find the volume of the region bounded by y=e^x, y=2, and the y axis
*May 1, 2012*

**Calculus**

the drop in blood pressure of a typical patient who is given a certain medication is given by F(x)=0.028x^2(19-x) where x is the amount of medication in cubic centimeters. What is the maximum drop in blood pressure for this patient?
*May 1, 2012*

**calculus**

find to the nearest integer the value of C that satisfies (y-6)dy=(x+4)/(y-3)dx, y(-1/12)=2
*May 1, 2012*

**chemistry**

What is the molarity of each kind of ion in a solution of magnesium chloride that contains 86.0 g of magnesium chloride dissolved in enough water to make 2.37 L of solution? M Mg2+ M Cl-
*May 1, 2012*

**chemistry**

Most community water supplies have 0.50 ppm of chlorine added for purification. What mass of chlorine must be added to 129.0 L of water to achieve this level?
*May 1, 2012*

**History**

does anybody have all the correct answer to the age of discovery to the american experiment please
*May 1, 2012*

**Cultural Anthropology**

what is Factory industrialism?
*April 29, 2012*

**Cultural**

Dependency theory refers to what?
*April 29, 2012*

**Probability and Statistics 2**

Minute Maid orange juice company claims that 25% or more of all orange juice drinkers prefer its product. To try to disprove the validity of this claim, Tropicana orange juice company sample 200 orange juice drinkers and found that 41 prefer the Minute Maid brand. At a=0.5 ...
*April 29, 2012*

**Probability and Statistics 2**

The University of Southern Mississippi currently uses GE brad fluorescent light bulbs that have a mean life of 900 hours. Sylvania clams that its new fluorescent bulbs, that cost the same as the GE bulbs, last longer than the GE brand. A sample of 50 Sylvania bulbs produces a ...
*April 29, 2012*

**Probability and Statistics 2**

The University of Southern Mississippi currently uses GE brad fluorescent light bulbs that have a mean life of 900 hours. Sylvania clams that its new fluorescent bulbs, that cost the same as the GE bulbs, last longer than the GE brand. A sample of 50 Sylvania bulbs produces a ...
*April 29, 2012*

**Probability and Statistics 2**

The numbers below represents heights (in feet) of 3-year old elm trees, where leaves represent fractional parts of each value. Stems Leaves 5 1,8 6 1,2,4,7,8,9 7 0,2,3,3,4,5 8 1,1,2,3,5,6,6,7,7,9,9 9 0,1,3,4 a) Find the five number summary for the given set of data. b) Produce...
*April 29, 2012*

**ALGEBRA**

r = 21.75%=0.2175 n = 1 t = 15 P = 695 A = P*(1+r/n)^n*t=695(1+0.2175/1)^15 A = $13305.14
*April 29, 2012*

**algebra**

T(bike)= 3/4hour= 0.75hour T(bus)1/4hour=0.25 hour R(bus)=R(bike)+20 Since D = R*T, then we have the equation T(bus)*(R(bike)+20)=T(bike)*R(bike) 0.25*R(bike)+ 5 =0.75*R(bike) Thus, R(bike)=10mph R(bus)= 10+20= 30mph D = 10*0.75= 7.5 miles or D = 30*0.25= 7.5 mies
*April 29, 2012*

**Probability and Statistics**

The major would like to estimate the mean number of automobile crashes per day at the intersection of 2 highways. A random sample of 40 days worth of data had a mean of 4.3 crashes and a standard deviation of 0.9. How large of a sample would be needed in order to produce a 95...
*April 29, 2012*

**Probability and Statistics**

The PGA would like to test to see if there is any difference in the distance produced by Titleist and Maxfli brand golf balls. A sample of 36 Titleist golf balls produced x1bar = 292ft, s1=16ft, while a sample of 48 Maxfli golf balls produced x2bar = 281ft, s2 20ft. Find a 90...
*April 29, 2012*

**Probability and Statistics**

The school superintendent would like to estimate the proportion of adults in the country that are in favor of an increased emphasis on the basics of education. A randomly selected sample of 150 adults found that 107 of them would favor an increased emphasis on basics of ...
*April 29, 2012*

**Probability and Statistics**

The ACT scores of applicants to college are approximately normally distributed with a mean of 20.3 and a standard deviation of 3.1. If a random sample of 20 applicants to college is chosen find the probability that their average ACT score will be 19 and 21.
*April 29, 2012*

**Probability and Statistics 2**

Bad Wheels Tire Company is interested in estimating the proportion of defective tires that it produces. The company tested a sample of 500 tires and found 16 to be defective. Find a 99% upper bound confidence interval for the true proportion of defective tires produced by the ...
*April 29, 2012*

**probability and statistics**

An electrical firm manufactures light bulbs that have a usuable life that is normally distributed with a mean of 1000 hours and a standard deviation of 80 hours. Find the probability that a package of 4 bulbs would last at least 4400 hours.
*April 29, 2012*

**Probability and Statistics**

A research psychologist believes that professional athletes tend to be more confident than the typical person. From previous testing, he knows that the scores for people in the general population are approximately normally distributed with a mean of 72 and standard deviation ...
*April 29, 2012*

**precalculus**

a rectangular piece of cardboard measuring 14 inches by 27 inches is to be made into a box with an open top by cutting squares of equal size from each corner and golding up the sides . let x represent the length of a side of each square. for what value of x will the volume be ...
*April 29, 2012*

**python programming**

Explain in python programming (x^n-1)/(x-1) = x^(n-1)+x^(n-2)+...+x+1
*April 29, 2012*

**Probability and Statistics**

A marine biologist has determined that the weight of a full weight of 2000pounds and a standard deviation of 500 pounds. Determine the probability that the average weight of the next five sharks captured will be less than 2100lbs.
*April 29, 2012*

**gcse geography**

Please could someone help me with this question. 5 arguments for wild farms and 5 argumets against wild farms. thankyou for taking the time to help me.:)
*April 27, 2012*

**pre-calc**

find the exact value of the given expression. Thank you! tan(1/2cos^-1(9/10)
*April 22, 2012*

**stoichiometry**

determine the number of moles in 4.50g of MgCl2?
*April 22, 2012*

**pre-calculus**

tan(1/2)cos^-1(9/10)
*April 22, 2012*

**MATH**

What Is Three Half Of 2/6/7 ? Pleasee Help !
*April 20, 2012*

**fractions and division**

seven
*April 18, 2012*

**Physics**

a 65 kg sled starting from the rest slides down a 14 m high frictionless ramp. at the bottom of the ramp the sled encounters a level area that is not frictionless. how much work is done by friction to stop the sled?
*April 16, 2012*

**Pharmacology**

the ration 3:100 would properly be expressed in fraction form as
*April 16, 2012*

**Physics**

An unmarked police car traveling a constant 80 km/h is passed by a speeder traveling 125 km/h. Precisely 3.00 s after the speeder passes, the police officer steps on the accelerator; if the police car's acceleration is 2.40 m/s^2, how much time passes before the police car...
*April 15, 2012*

**Math**

While digging for buried treasure, chi finds 9 3/4 lb of gold coins. If the price of gold is $806 per ounce, what is the value of the coins
*April 15, 2012*

**Math**

While digging for buried treasure, chi finds 9 3/4 lb of gold coins. If the price of gold is $806 per ounce, what is the value of the coins
*April 15, 2012*

**Art**

Explain how Florence reflects the ideals of the dominant city-state and how some of the geographical, economical, social, and artistic forces shape this ideal
*April 9, 2012*

**Tax**

Kobe AGI is 51,000 which means he gets a 20% tax credit(according to the tax credit% chart). Which means 6,300 times 20%. The answer is C. $1,260.
*April 2, 2012*

**biology**

Below the human hemoglobin sequence are the first thirty amino acid sequences of several other species’ hemoglobins. Inspect the sequences and answer the following questions: Human) h l t p e e k s a v t a l w g k v n v d e v g g e a l g r l A) ml t a e e k a a v t a f w ...
*April 1, 2012*

**Finance**

We are currently bidding on Treasury bills and have determined that we must have a 5% return for a $1,000 T-Bill that will mature in one year. How much would we be willing to bid on the Treasury bill? If we are bidding on a 13 weeks Treasury bill with a 1% return and a 26 ...
*March 30, 2012*

**Scale Representations**

123
*March 29, 2012*

**chemisrty**

what volume of hydrogen gas at STP can be produced by reacting 15.0 grams of uluminum with sulfuric acid? the equation is: 2Al+ 3H2SO4---> Al2(SO4)3+ 3H2
*March 29, 2012*

**chemistry**

what would the pressure of H2 gas collected in lab over water at 20.0 degrees celcius and 767 torr?
*March 29, 2012*

**chemistry**

FIND THE PH IF THE {H30Z+1) IS 6.2 X 10-10 M
*March 27, 2012*

**ALGREBA**

oFFICE JET PRINTERCOPY SUES DISSERTATION IN 22 MIN LASER PRINTER CAN COPY THE SAME IN 20 MIN HOW LONG WOULD IT TAKE TO TO COPY THE DISSERATION.
*March 26, 2012*

**UNIVERSITY OF PHONEX**

HELP ME WITH MATT 117 WEEK 4 QUIZ
*March 26, 2012*

**science**

At 472 deg C the reaction reaches equilibrium with the following composition: [H2]=7.38atm, [N2]=2.46atm, [NH3]=0.166atm. Into the equilibrium mixture 1.5 atm of N2 is introduced: a. Calculating Kp and Q, determine in which direction the reaction will proceed after addition of...
*March 26, 2012*

**english**

In the article, "How Lethal Was the K-T Impact?" by Richard A. Kerr and Virginia Morell, what is listed as part of the related subject matter?
*March 19, 2012*

**Physics**

An archer shoots an arrow into a piece of wood. The arrow is traveling at 120 km/h when it strikes the wood. The arrow penetrates 3.8 cm into the wood before stopping. What is its average acceleration (in m/s2) into the wood?
*March 19, 2012*

**chemistry**

if the rate of a reaction doubled with temperature increase from 30 to 40 degrees celcius, what is the activation energy
*March 19, 2012*

**Chem!!!:/**

Determine whether or not AgI will be more soluble in acidic solution than in pure water.
*March 19, 2012*

**Chemistry**

what is the mass in kilograms of 750.0mL of mercury at 25.0 C(d=13.5g/mL)
*March 19, 2012*

**geometry**

Use the Pythagorean distance formula to calculate the distance between the following points on a graph: (-7,-3) (8,-11)
*March 18, 2012*

**Algebra**

Your kids have asked you to set up a cable fromtheir tree house to the ground so that they can slide down quickly when it’s time to head in for lunch. The tree house is 12 feet from the ground. You determine that in order to get a gentle enough slope from the tree house ...
*March 18, 2012*

**Algebra**

At a local park, there is a large circular fountain feature that is 50 feet across, surrounded by a path that is 8ft wide. A father and son plan to have a “friendly” race around the path. To be fair, the father agrees to run around the outside circle of the path, and...
*March 18, 2012*

**Algebra**

At a local park, there is a large circular fountain feature that is 50 feet across, surrounded by a path that is 8ft wide. A father and son plan to have a “friendly” race around the path. To be fair, the father agrees to run around the outside circle of the path, and...
*March 18, 2012*

**algebra**

the fax corporation bought a fax machine for $700. the fax machine depreciates at a rate of $25 a month A) Find a function F that can be used to determine the value of the fax machine t months after purchase. complete the model below. F(t)=
*March 17, 2012*

**chemistry**

which pair(s) of liquids will be miscible ? H2O AND CH3CH2CH2CH2CH3(PENTANE) C6H6 (BENZENE) AND CCl4(CHLOROFORM) C2H5OH (ETHANOL) AND CH3COOH(ACETIC ACID) how do you know if they are miscible?
*March 16, 2012*

**chemistry**

which solution has highest freezing point if all are at the same molality calcium chloride sodium nitrate potassium sulfate iron(III) nitrate all have same freezing point please explain
*March 16, 2012*

**MATH!**

The mass of a radioactive substance follows an exponential decay model, with a decay rate of 5% per day. A sample of this radioactive substance was taken six days ago. If the sample has a mass of 3 kg today, find the initial mass of the sample. Round your answer to two decimal...
*March 15, 2012*

**Math**

sketch the region bounded by the graphs of f(y)=(y/Squareroot of(16-y^2)), g(y)=0, y=3 and find the area of the region.
*March 15, 2012*

**Chemistry**

2NaOH + H2SO4 -> Na2SO4 + 2H2O
*March 15, 2012*

**E.C.E**

To broaden a search
*March 15, 2012*

**Math**

Well, think of an apple pie cut in pieces (denominator). 1 slice out of 8 slices would be the smallest. Take an identical pie and cut it into 4 pieces. 3 slices out of 4 is quite a bit (75% of the pie fatso!). Get it? That is the visual way. You can also do percents. Just ...
*March 15, 2012*

**Related rate**

Ha! I figured it out. dA=8pir dr r=10 , dr=10.2 dA=8(10)(.2)pi dA=16pi (approx) check: A(10)=4(10)^2pi A(10)=400pi A(10.2)=4(10.2)^2pi A(10.2)=416.16 A(10.2)-A(10)=16.16pi (exact)
*March 14, 2012*

**Related rate**

Use differentials to find the approximate change in the surface area when the radius of the sphere is increased from 10cm to 10.2cm. I know A=4pir^2 and A' is 8pir but I'm not sure how to set it up from here. Can someone please show me all the steps involved? (This isn...
*March 14, 2012*

**english**

Not sure what the context is so include the subject(s) after "Both". Also, try "their place in" or "their position in" in place of "fitting in among". Maybe add "personal" before identity.
*March 14, 2012*

**political science**

a)
*March 14, 2012*

**Algebra**

The value of almost everything you own, such as a car, computer, or appliance, depreciates over time. When the value decreases by a fied amount each year, the depreciation is called straight-line depreciation. Suppose your car has an initial value of $16,750 and depreciates $...
*March 12, 2012*