Thursday

July 2, 2015

July 2, 2015

Total # Posts: 1,292

**chemistry**

I'm starting to learn about colligative properties and i want to know if there are different equations for boiling point elevation and freezing point depression? In the book they give me the equation: (delta)Tb= Kb times molality. But my teacher gave us: delta Tb = Kb ...
*June 1, 2010*

**Chemistry**

What pressure will be exerted by each of the gases in the following mixture if the total pressure of the mixture amounts to 768.8 torr? 0.500 g of hydrogen; 0.245 g of oxygen; 0.335 g of nitrogen. What do I need to do??
*May 27, 2010*

**algebra**

if one card is selected at random from a standard deck of 52 cards, what is the probability of choosing a black card or a king?
*May 23, 2010*

**algebra**

Which of the following ia equivalent to the expression (t^2-t-6)(t-3)^-1? a. t^3-9t+18 b. (t-2)(t+3) c. (t+2)(t-3) d. (t-2) e. (t+2) The correct answer is e, however, I cannot figure out how to work the problem out to get that answer. Can you show me how to work this out ...
*May 23, 2010*

**pre-cal**

solve this system of equation 3x-y+5z-2w=-44 x+6y+4z-w=1 5x-y+z+3w=-15 4y-z-8w=58
*May 5, 2010*

**chemistry**

explain how you would make the following solution. You should tell how many grams of the substance you need to make the solution, not how many moles. 2L of 6M HCl
*May 5, 2010*

**chemistry!**

I just pick any? Don't I have to put 3.0 L in the equation?
*May 4, 2010*

**chemistry!**

An ideal gas has a volume of 3.0 L. If the number of moles of gas and the temperature are doubled, while the pressure remains constant, what is the new volume?
*May 4, 2010*

**algebra**

Two questions actually. Please only respond with step-by-step answers. Feel free to change the numbers, I just need to know how to do it... 1.) Factor Completely: 4a^2 + 81 - 36a 2.) In a right triangle, find the length of the side not given. b= 2 c= sqrt. 13
*May 2, 2010*

**math**

seven more that some number equals twenty one
*April 29, 2010*

**math**

seven more that some number equals twenty one
*April 29, 2010*

**physics**

You are holding a shopping basket at the grocery store with two 0.68- cartons of cereal at the left end of the basket. The basket is 0.80 long. Where should you place a 1.8- half gallon of milk, relative to the left end of the basket, so that the center of mass of your ...
*April 28, 2010*

**Science Fair**

What's the cheapest wind turbuine that will create 356965 kwh a year. PLEASE REPLY
*April 27, 2010*

**Biology**

when there is a deleterious (harmful) mutation in the gene coding for the protein 6-phosphofructokinase, muscle type
*April 25, 2010*

**spanish**

The waiter informs about your problems
*April 24, 2010*

**Statistics**

The annual Salary of an electrical engineer is given in terms of the years of experience by the table below. Find the equation of linear regression for the above data and obtain the expected salary for an engineer with 45 years of experience. Round to the nearest $100. Years ...
*April 24, 2010*

**Fianacial Management in Health Care Organizations**

the formula is used was $5000(1+r)^n
*April 16, 2010*

**algebra**

in graphing quadratic functions what are the ordered pairs for y=x*x+2
*April 15, 2010*

**chemistry**

Is anyone know the molecular weight of 6-ethoxycarbonyl-3,5-diphenyl-2-cyclohexenone. i can't find it . Thanks
*April 12, 2010*

**physics**

Two charges seperated by 1 meter exert a 1 N force on eachother. If the magnitude of each charge is doubled, the force on each charge is?
*April 10, 2010*

**Science**

Waste created by man can be classified under Heading X (eg torn book, mouldy bread, rotten apple) and Heading Y (plastic bag, biscuit tin, broken bulb). What is Heading X and Heading Y?
*April 6, 2010*

**Geometry**

I have a project due this week and I have to make a board game, so I need 15 questions about right triangles. I already have about 7, so is there a website with some examples? This is 10th grade geometry.
*April 5, 2010*

**Chemistry**

A 0.490 M solution of an unknown monoprotic weak acid, HA, is 2.80% ionized. What is the value of Ka for HA?
*April 5, 2010*

**Chemistry**

If 27.5 mL of 5.7 multiplied by 10-2 M HNO3 is added to 20.0 mL of 2.2 multiplied by 10-2 M HNO3, what is the pH of the solution?
*April 5, 2010*

**BIO100**

Post a 200- to 300-word response to the following: In your own words, summarize each of the major theories of biology. Choose one theory and provide an example of how this theory relates to the news today. Use at least one outside reference in addition to your text. Use APA ...
*March 31, 2010*

**CALCULUS **

thank u sooo much
*March 30, 2010*

**CALCULUS **

gardner wishes to encloe a rectangular 3000 square feet area with bushes on three sides and a fence on the 4th side .If the bushes cost $25.00per foot and the fence costs $10.00 per foot, find the dimensions that minimize the total cost and find the minimum cost
*March 30, 2010*

**Definiton**

Define: Provincial Government Can someone help me?
*March 30, 2010*

**accounting**

Deane Company issues $5 million, 10-year, 9% bonds at 96, with interest payable on July 1 and January 1.The straight-line method is used to amortize bond discount. Prepare the journal entry to record interest expense and bond discount amortization on July 1, 2008, assuming no ...
*March 29, 2010*

**Spanish**

What is the 12 calzones?
*March 26, 2010*

**Chemistry**

Hi I just need help with question (ii) and (iii), i know how to work out (i) A solution is prepared by dissolving 0.2222 (±0.0002) g of KIO3 in 50.00 (±0.05) mL (i) Calculate the molar mass of KIO3 with its associated uncertainty to the correct number of ...
*March 26, 2010*

**Science**

If the sun is in the center of the constellation Sagittarius on January 10, what time would the sun rise and what time would it set? Need an answer!!!!!
*March 26, 2010*

**Science**

If the sun is in the center of the constellation Sagittarius on January 10, what time would the sun rise and what time would it set? Need an answer!!!!!
*March 26, 2010*

**Calculus II**

I have a function RC * dvout/dt + vout = RIin and the initial condition vout(1) = 0 for t = 0 to 7.5. When I set up the equation to be solved using Euler's method, is it: vout = vout + f(vout,t)*step size, with f(vout,t) = (RIin - vout)/RC.
*March 24, 2010*

**chemistry**

Determine Kc at 298 K for the reaction 2 CH4(g) reverse reaction arrow C2H2(g) + 3 H2(g), given the following data at 298 K. (Hint: How are Kc and Kp for the reaction related?) CH4(g) + H2O(g) reverse reaction arrow CO(g) + 3 H2(g) Kp = 1.2 multiplied by 10-25 2 C2H2(g) + 3 O2...
*March 24, 2010*

**Calculus II**

I have a function RC * dvout/dt + vout = RIin and the initial condition vout(1) = 0 for t = 0 to 7.5. When I set up the equation to be solved using Euler's method, is it: vout = vout + f(vout,t)*step size, with f(vout,t) = (RIin - vout)/RC.
*March 24, 2010*

**Biology**

There are 10 Characteristics of a living organism 1. Composed of one or more cells 2. evolve into a new type of organism 3. carries out and controls a variety of Chemical reaction 4. produces offspring resembling itself. What are 6 more.
*March 22, 2010*

**world history**

What were stalins goals & what steps did he take to acheive them?
*March 22, 2010*

**Physics**

A solar panel (an assemblage of solar cells) measures 58 cm x 53 cm. When facing the Sun, this panel generates 2.7 A at 14 V. Sunlight delivers an energy of 1.0×10^3 W/m^2 to an area facing it. What is the efficiency of this panel, that is, what fraction of the energy in...
*March 22, 2010*

**French History**

I know. I'm very sorry for the misinterpretation.
*March 21, 2010*

**French History**

I have to write about a building's history, so I chose the Notre Dame cathedral. I also need visitor information but I already have that.
*March 21, 2010*

**French History**

I know, I got it from that website, but for some reason I can't copy and paste the link, and I need to know if there's anything I'm missing for my brochure. I have no intentions of plagiarizing, sorry.
*March 21, 2010*

**French History**

Is this good information about the Notre Dame cathedral? Notre-Dame's first version was a magnificent church built by Childebert I, the king of the Franks at the time, in 528, and was already the cathedral of the city of Paris in the 10th century. However, in 1160, having ...
*March 21, 2010*

**10th grade Math**

Thank you very much :)
*March 20, 2010*

**10th grade Math**

Triangle POB has vertices: P(0 , 4) O(-3 , 0) B(3, 0). Determine the orthocentre of the triangle.
*March 20, 2010*

**macroeconomics**

do you experience loss aversion as a consumer?
*March 19, 2010*

**personal finance**

B - Return
*March 17, 2010*

**Organic Chemistry**

why was it possible to separate the product from sodium hydroxide using acetone?
*March 15, 2010*

**chemistry**

What is the mass of a mole of electrons if one electron has a mass of 9.11 x 10^-28 g?
*March 14, 2010*

**health and disease**

How do disease impact the delivery of health care services, such as treatment options and resources available today to the public?
*March 10, 2010*

**Maths Methods**

and can you please show steps in how to solve it. Thanks
*March 3, 2010*

**Maths Methods**

Factorise 5x^2 + 8x + 3
*March 3, 2010*

**chemistry**

Is hydroxyl(-OH) is the functional group present in benzyl alcohol? And what classification tests would you run to verify your IR results?
*March 3, 2010*

**chemistry**

Can anyone help me !!! The IR spectrum of your lipid unknown shows a broad & strong absorption band at 3400, medium intensity bands at 3119 & 3086 and a set of bands at 1613,1586,1515 and 1465 cm-1 1) What functional group is present in your compound? 2) What classification ...
*March 2, 2010*

**english**

What say you to these stuffy Puritans? How is their Puritan lifestyle different from your pirate lifestyle? No pirate journal would be complete without some proper "pirate talk." Visit the Pirate Glossary to discover some common pirate terms. Select at least five of ...
*March 2, 2010*

**4th grade math**

729, 243, 81, 27, __, __, __?
*March 1, 2010*

**english**

What is the difference of "there" "they're" and "their"?
*February 23, 2010*

**chemistry **

12
*February 23, 2010*

**writing sentences and paragraphs**

Need help writing a introductory paragraph on medical insurance billing and coding career essay
*February 22, 2010*

**Chemistry**

I know how to find a and b on this problem but how do I find c? Really would appreciate the help, thanks! The formula of a compound of iron and sulfur was determined using the method of mass measurements. A sample of iron was weighed into a crucible and covered with finely ...
*February 21, 2010*

**geometry**

thank you so much :]
*February 17, 2010*

**geometry**

i need an easier way to explain what angle side angles are and side angle side are? it's just so confusing :[
*February 17, 2010*

**Spanish**

I try to write a summary for Mañana de Sol. So, can anyone please check my grammar and vocabulary? Thank you! “Mañana de Sol” dos desconocidos se encuetran en el parque y, aunque al comienzo no se dan muy bién, terminan por siendo amigos. Los dos...
*February 10, 2010*

**Please check my work!**

I try to write a summary for Mañana de Sol. So, can anyone please check my grammar and vocabulary? Thank you! “Mañana de Sol” dos desconocidos se encuetran en el parque y, aunque al comienzo no se dan muy bién, terminan por siendo amigos. Los dos...
*February 10, 2010*

**maths**

Oh, I've got it! It's 27!:)
*February 4, 2010*

**maths**

The ratio of oranges and bananas is 3:6. There are 54 pieces of fruit altogether, how many of them are oranges? Do I set it up 3/6 times x/54?
*February 4, 2010*

**MARDI GRA.**

yes. which one do you think is better?
*February 2, 2010*

**MARDI GRA.**

im thinking about, are you ready for king cake, is that good?
*February 2, 2010*

**MARDI GRA.**

Okay, im doing a project on Mardi gras and i neeed a catcby title w/o telling the subject of the project. kinda like a riddle?
*February 2, 2010*

**statistics**

Given the following situation, how would you use Megastat to test whether the population defective rate is greater than 10%? Please outline the process for the test and, if necessary, including the output from Megastat to explain your approach. What conditions do you need to ...
*January 29, 2010*

**sum fun (math)**

find a quick and easy method to compute the sum of the first 100 counting numbers (no calculators allowed)
*January 27, 2010*

**6th grade math**

what is the reciprocal of 7/4????????????? how do you find the reciprocal of 7/4?????
*January 26, 2010*

**Statistics**

The Roper Organization conducted identical surveys in 1990 and 2000. One question asked women was, “Are most men basically kind, gentle, and thoughtful?” The 1990 survey revealed that, of the 3,000 women surveyed, 2,010 said that they were. In 2000, 1,530 of the 3,...
*January 26, 2010*

**chemistry**

how many grams of HNO3 can be produced if 225 grams of NO2 is mixed with 55.2 g of H2O? 3NO2 + H2O=2HNO3 + NO
*January 24, 2010*

**11th grade**

I need help on how to factor a polynomial by grouping
*January 18, 2010*

**calculus**

Evaluate the indefinite integral: ((4/x^5)+(4/7x))dx
*December 13, 2009*

**calculus**

Evaluate the indefinite integral: (8e^x)dx
*December 13, 2009*

**Math-Statistics**

Suppose you want to test the claim that mean is not equal 3.5. Given a sample size of n = 45 and a level of significance of a = 0.10, when should you reject H0 ? A) Reject H0 if the standardized test statistic is greater than 1.96 or less than -1.96 B) Reject H0 if the ...
*December 12, 2009*

**Problem Solving-Division**

How can you check an answer of a quotient with a remainder? Use quotient, dividend, and divisor in your answer.
*December 10, 2009*

**World* Geography**

Thank you!
*November 24, 2009*

**Wolrd Geography**

Imagine this situation: Country A invades and conquers Country B. The resulting acculturation has negative effects. Country B's economy undergoes a dramatic change when the new government replaces capitalism with another form of economy. What are the most likely results of...
*November 24, 2009*

**French**

Complétez avec l’article défini ou indéfini qui convient. 1. Vous aimez __ou__ cinéma ? 2. Vous avez l’appartement ? 3. Vous connaissez __les__ enfants de Michel ? 4. Je voudrais __le__ morceau de pain. 5. Vous lisez ____ journaux ? 6. Il ...
*November 23, 2009*

**MATH**

what's the equation tho?
*November 23, 2009*

**organic Chemistry**

In my Organic chemistry lab, the calculated enantiomeric excess was over 100% . Is this possible? and If not, what sort of error could have been made? *the observed optical rotation was read correctly
*November 23, 2009*

**Math**

Bert is 11 kilometers away from Brenda. Both begin to walk toward each other at the same time. Bert walks at 4 kilometers per hour. They will meet in 2 hours. How fast is Brenda walking?
*November 21, 2009*

**Algebra**

1. n^3/n^5 2. (2b)^3(b^-4) 3. (mn)^2 ∙ n^4 4. 3a^5 ∙ 5a^-2 ∙ a^3 5. (x^3/xy^4) ∙ (y/x)^5 6. (a^-1)(b^2)/ab ∙ (a^2)(b^3)/b^-2
*November 18, 2009*

**reading**

Who wrote this poem where a boy couldn't write a poem but instead he ended up writing one with all his excuses?
*November 16, 2009*

**Math**

What are the odds against getting all heads or all tails in three successive flips of a coin? I say it is 3:1, is this right?
*November 15, 2009*

**logarithms**

how do i solve: log4x^3 + log2x^1/2 = 8 please help me
*November 8, 2009*

**Math**

6 feet 12 feet
*November 5, 2009*

**5th grade math**

there r 2 girls n one girl has $.60 more then the other and together they total $8.20. so u set up an equation 2x+.60=$8.20. u first subtract 60 cent from both sides n that leave u with 2x=$7.60. now u divide both sides by 2 to get how much each girl has n x= $3.80. n finally ...
*November 5, 2009*

**calculas**

Consider the function f(x)x^4 -32x^2 +2, -3 < or = to x < or = to 9. This function has an absolute minimum value equal to ? and an absolute maximum value equal to ?
*November 5, 2009*

**calculus**

The linear approximation at x=0 to f(x)= sqrt (7+6x) is y=
*November 5, 2009*

**calculas**

The function f(x)= (8x-7)e^2x has one critical number. Find it
*November 5, 2009*

**calculus**

If f(x)=x^3. Yhe equation of the tangent line to f(x) at x=4 is y=? Using this, we find our approximation for 3.8^3 is ?
*November 5, 2009*

**math115**

u first distribute the -5 to the 3x n negative 4. so u get 6-15x+20=-49. u then combine 6 and 20 to get 26. so u get 26-15x=-49 then u subtra t 26 from buth sides and get: -15x=-75. then u divide -15 from both sides n x =5. hope this helped!!
*November 5, 2009*

**Science,Ecology**

What do iterlocking food chains make up?
*November 2, 2009*

**Math**

Solve the quadratic equation below. Show your work and check -4x^2 = 0
*November 2, 2009*

**Chemistry**

Which of the following is most likely to LOSE electrons when forming an ion? a. F b. P c. S d. Rh e. Se
*November 1, 2009*