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October 25, 2014

Posts by David


Total # Posts: 1,685

math
This cube has five cubes along each edge. The faces are covered, but the cube is hollow inside. Can it be divided into two pieces of equal volume? Explain. I am not sure what this question is asking? Does this look right? l x w x h= 5x5x5=125 125/2=62.5 Both sides have 62.5, ...
April 2, 2008

chemistry
d is the correct answer
April 2, 2008

gr 7 math
This cube has five cubes along each edge. The faces are covered, but the cube is hollow inside. Can it be divided into two pieces of equal volume? Explain. I am not sure what this question is asking?
April 2, 2008

Calculus - Integrals
I made this question, just wanted to make sure it didn't drown under the tide... I've set a problem up, something like this. s^4: A+D=0 s^3: -2A+B-3D+E=0 s^2: 2A-B+C+3D-3E=0 s^1: -2A+B-D+3E=4 s^0: A+C-E=4 Count Iblis -It's easier to substitute for s the values that...
March 25, 2008

Calculus - Partial Integrals
I'm confused. As soon as I get the so called 'Basic Equation,' I just don't know what to do after....
March 25, 2008

Calculus - Partial Integrals
The paragraph after the thing with s as a variable is copy and pasted from Count Iblis.
March 25, 2008

Calculus - Partial Integrals
I made this question, just wanted to make sure it didn't drown under the tide... I've set a problem up, something like this. s^4: A+D=0 s^3: -2A+B-3D+E=0 s^2: 2A-B+C+3D-3E=0 s^1: -2A+B-D+3E=4 s^0: A+C-E=4 It's easier to substitute for s the values that make the ...
March 25, 2008

Calculus - Partial Fractions
Would anybody mind showing it out? I tried what Count Iblis said, but it didn't really work out well...
March 24, 2008

Calculus - Partial Fractions
I'm sorry. I forgot to say that I don't know how to solve for A, B, C, D, and E... Help there would be appreciated.
March 24, 2008

Calculus - Partial Fractions
I've set a problem up, something like this. s^4: A+D=0 s^3: -2A+B-3D+E=0 s^2: 2A-B+C+3D-3E=0 s^1: -2A+B-D+3E=4 s^0: A+C-E=4
March 24, 2008

Calculus - Integrals
That's my problem. When I tried solving for A, B, C, D, and E in that first problem, it didn't really work out right...
March 24, 2008

Calculus - Integrals
1) A/x + B/(1+x) 2) A/x + B/x^2 + C/(1+x) I think I'm right....
March 24, 2008

Calculus - Integrals
I'm not quite sure about your explanation on Partial Fractions... And Liouville's Therom. We haven't done that in class... so...
March 24, 2008

Calculus - Integrals
I have 3 questions, and I cannot find method that actually solves them. 1) Integral [(4s+4)/([s^2+1]*([S-1]^3))] 2) Integral [ 2*sqrt[(1+cosx)/2]] 3) Integral [ 20*(sec(x))^4 Thanks in advance.
March 24, 2008

Calculus - Integrals
Could you expand on #1 a bit more? I tried Partial Fractions, but I couldn't get a definite answer...
March 23, 2008

Calculus - Integrals
I have 3 questions, and I cannot find method that actually solves them. 1) Integral [(4s+4)/([s^2+1]*([S-1]^3))] 2) Integral [ 2*sqrt[(1+cosx)/2]] 3) Integral [ 20*(sec(x))^4 Thanks in advance.
March 23, 2008

critical thinking
premise--terrorists attacks of September 11, 2001, produced a response among American officialsm the media and public conclusion--matched only by the attack on Pearl Harbor
March 20, 2008

APA FORMATTING
I think it's C. Am I right? When using APA, which of the following describes the method in which a work without page numbers should be presented in in-text citations? A. No mention of the page number is required in APA B. If no page number is present, it is not a credible ...
March 19, 2008

English
I think it's a, but document formatting messes me up a little :) Any help would be great, and much appericated When citing a source within the body of your essay, what must be included after the quotation marks at the end of the sentence (when the author’s name has ...
March 19, 2008

Geography AS level
why are waterfalls tempary features
March 18, 2008

Oceanography
What are the steps and timing of the whales, dolphins, porpoises evolution.
March 13, 2008

Oceanography
How did the extinction of the Mesozoic marine megafauna allow evolution of cetaceans?
March 13, 2008

Business Ethics
In the case study of Geletx, what should Jed do? Is this a violation of FAPA?
March 12, 2008

Social studies
all I need to know is is it hudusim or Buddism?
March 8, 2008

Social studies
of Hindusim and Buddhism which has a definite indentifiable start?
March 8, 2008

Social studies
What is the climatic issue that significantly influences the Indian subcontinent?
March 8, 2008

social studies
What architectural wonder was completed in 1648?
February 28, 2008

engineering physics 2
A 19 m long piece of wire of density 8.34 g/m3 has a diameter of 12.593 mm. The resistiv- ity of the wire is 1.7e-8(ohm)(m) at 20 degrees celsius. The temperature coefficient for the wire is 0.0038(degrees celsius)^-1. Calculate the resistance of the wire at 20degrees Celsius...
February 28, 2008

chemistry
2Al+3Cl2=2AlCl3 calculate the amount(number) of excess reagen units remaining when 4.03x10^23 Al atoms and 6.42x10^23 Cl2 molecules react? please help!!!!! thanks
February 23, 2008

french
does any one know the french meaning of la nouvelle .
February 23, 2008

year 7 french
i need to translate countries written in french into english . does anyone know if there are any good sites that will help me. thanks
February 23, 2008

math
I tried to answer this but i don't know if i am even close. I included my work .Thanks. The island's travelling sales monkey is selling gold watches that washed up on the beach. The islanders use green stones, pink clamshells and ox horns for money.Sixty-two green ...
February 13, 2008

grade 7math
The island's travelling sales monkey is selling gold watches that washed up on the beach. The islanders use green stones, pink clamshells and ox horns for money.Sixty-two green stones have the same value as 17 ox horns and 258 pink clamshells have the same value as 89 ...
February 13, 2008

Economics
In running a regression model with three variables, two of the three come back as statistically significant at the 95% level of confidence. The one that doesn't is the intercept - so is my model still valid?
February 9, 2008

math
Thanks so much.I worked on this while i was waiting and ended up doing it backwards from you but got the same answer. 150+6=156 156/13=12 364+26=390 390/13=30 60+5=65 65/13=5 60 is the common multipler, so i got 60 days. Is this still right?
February 6, 2008

math
I really don't know where to start or what stratedgy to use.
February 6, 2008

math
Days on Planet Red are 13 hours long. The animals on Planet Red have regular eating and sleeping habits. The silver snake sleeps for 150 hours, eats for 6 hours, then goes back to sleep. The green walking fish sleeps for 364 hours, eats for 26 hours and then goes back to sleep...
February 6, 2008

Physics
Can I use P1/P2=(T1/T2)y/y-1 to find the temperature when we pressure liquid refrigerant, for example liquid propane?
February 6, 2008

Physics 11
The brakes on a car permit it to decelerate at the rate of -8.0m/s^2. How much distance is required to stop this car when it is travelling 60.0km/hr? The answer given is 173.6m I solved it this way 60km/h = 16.667m/s A=V/T 16.667m/s / -.80m/s^2 = 20.834 seconds D=RT 16.667m/s ...
February 6, 2008

History
Yea i thinks its D also... all the other answers are not as good, so im goin with that Palmer. Page 462 is what ive found Right under the purple section...
February 2, 2008

Chemistry
A 15.0g sample of liquid ethanol, C2H5OH, absorbs 5.13x10^3 J of heat at its normal boiling point, 78.0C. The molar enthalpy of vaporization of ethanol is 39.3kJ/mol. (a) What volume of ethanol vapor is produced? The voume is measured at 78.0C and 1.00atm pressure. (b) What ...
January 27, 2008

social health
I want a picture of social health
January 23, 2008

science
how does a magnet attract a paperclip ?
January 7, 2008

Chemistry
If I have 1.27 cm^3, how do I convert into picometers?
January 2, 2008

Chemistry
Metallic sodium adopts a body-centered cubic structure at 25 degrees C and 1 atm. The density of sodium under these conditions is 0.97 g/cm^3. What is the unit cell length?
January 2, 2008

math
haylee is geting a job for moing lanws her dad lowns her 190 dollars to by a lawn mower. when she startes she is in depth 190 dollars. in week two she is in depth 70 dollars. how did she get to be depth 70 dollars
December 16, 2007

Chemistry
Use the equation, PV = nRT n = 3mol T = 273K P = 101.325kPa = 1atm R = .08206L•atm/K•mol Solve for V
December 10, 2007

Calculus
The question is, if f(x) is equal to the series from n to infinity of a sub n times (x-7)^n for all n, find a formula for a sub 10. (I apologize for typing it out in the way that I did, but it was the only way I could. I don't quite understand what is being asked here. I ...
December 10, 2007

math mesurment
how many grams in a pound
November 26, 2007

physical science
How much force is needed to accelerate a 50-kg rider and her 250-kg motorcycle at 5 m/s2?
November 19, 2007

pigskin geography
Are there more than 3 cities which will be visited by a team from a bordering state? Question 1 week 10 November 11, 2007
November 12, 2007

pigskin geography
Are there more than 3 cities which will be visited by a team from a bordering state? Question 1 week 10 November 11, 2007
November 12, 2007

homework ath physics
how to become en expert?
November 7, 2007

Mathematics
I have to show that for any (pi)A, Sin(A)squared + Cos(A)squared = 1. I don't really get the question... am I supposed to multiply A by pi? Even if that weren't the case, I still do not comprehend how the squared sine and cosine will cancel out... I'd really ...
November 6, 2007

math
3/7x+5=8. I tried to cross-mulitplied and I got 3x+35=8. I divided -27 by 3 and I got -9. Is this right?
November 1, 2007

math
A particle moves with constant speed of 3m/sec along path y=3x^2 What is the acceleration of the particle at x=1.5m? I know that Velocity is y'=6x Somebody please help!
October 25, 2007

physics
A particle moves with constant speed of 3m/sec along path y=3x^2 What is the acceleration of the particle at x=1.5m?
October 25, 2007

physics
i did GM5850/4.15E6^2= 5850*217183.3^2/ 4.15E6 my V was 217183.3 then when i solved for GM i got 1.9574E37 and pluged that into the weight equation and it was marked wrong. someone please help
October 18, 2007

Art
Can anyone provide help with finding a site that shows how American pop culture has influenced art throughout the world?
October 10, 2007

math
The summ of two numbers is two. THe difference between eight and twice the smaller number is two less than four times the larger. Find the two munbers.
September 30, 2007

Ethics
First, we must demand more of our leaders. If we do not get the result you want, change your leaders. Emphasize education. A good education is an important way to improve the odds for any children. The whole community needs to make education a top priority. The importance of ...
September 27, 2007

Ethics
What are some solutions the the economic challenges of Aferican Americans?
September 27, 2007

Ethics
Why are racial imbalances in our economy difficult to overcome?
September 27, 2007

Math/Metric system
I need to know how to make conversions and compare within the metric system of measurement. Such as 0.75L. is equal to how many mL. I have to do problems like that with length, weight, andvolumn.
September 25, 2007

Religious Eduction
Shahadah, Salah, Zakah, Sawm, and Hajj. en(dot)wikipedia(dot)org(forward slash)wiki(forward slash)Five_Pillars_of_Islam
September 22, 2007

English
searching for evidence in the novel Being There by Kosinski that the author dislikes humans and Americans
September 15, 2007

Physics
oh but yeah u first use the equation v=v(0)+at and then use y=v(0)t+1/2at^2. Set v(0) to zero each time and a to either -9.8 m/s if it is going upward or 9.8 m/s if it is going downward
September 12, 2007

grammar
I have homework in grammar and the title is Giving Instruction in Reponse to Expository Writing Prompts so I have choose an electroni apppliance with which I am familiar with and write directions for a friend that explain an important procedure in the use of the appliance and ...
September 9, 2007

algebra 3
how do i solve square root of 72x to the 3rd power?????
August 23, 2007

Math
I need help with the following problem: Directions: Express each answer in simplest form in terms of the given variable. Problem: An angle has measure Xº. Find the average of the measures of a complement and a supplement of the angle.
August 20, 2007

Finacial
Develop a set of pro forma financials (income statement and balance sheet only) for the next fiscal year-end using the percent-of-sales method. Assume that the company's sales have increased by 15%.for Exxon corp. balance sheet and income statement can be found on the web....
August 6, 2007

math
how can you simplify this?? log10(10^.5) log10 as in log base 10 By definition: Log_10[10^(x)] = x ok, but it is 10 to the 1/2 power, not x how would you simplify it then? That's then the special case of x = 1/2: If for all x: Log_10[10^x] = x, then for x = 1/2 this ...
July 14, 2007

eth 125
There are those who profess to be bible thumping right wing Christians who are the most intolerant and prejudicial people anywhere. usually, knowledge, education, and understanding can promote acceptance and tolerance. People need to develope a live and let live attitude. ...
June 30, 2007

Accounting
What is an example of present value concept? If you win the lottery, and they tell you will get 20,000 a year for 30 years. What is that worth in present dollars? $36000.00
June 28, 2007

Algebra
How do you arrive at the answer for: what is the value of t in the following problem? 9 = t + 7s subtract 7s from both sides.
June 22, 2007

Accounting
How might borrowing $1 million long-term and investing the proceeds in inventory affect cash and net working capital? Borrowing $1 million and investing the proceeds will increase the cash and net working capital by $1 million less the interest charges.
June 10, 2007

Accounting
How would paying out a $2 million cash dividend affect cash and net working capital? It seems to me that paying out a $2 million cash dividend will diminish the cash and net working capital by $2 million plus the costs of paying this dividend.
June 10, 2007

COM 125
can you please help me paraphrase this paragraph. The eradication of al-Qaeda is as much an intelligence and law enforcement challenge as it is a purely military campaign. While special operations, commando raids, and air strikes are important weapons against bin Laden's ...
May 28, 2007

humanities
To accept the old into the modern
April 28, 2007

math
The amount of money in an account with continuously compounded interest is given by the formula A=Pe^rt , where P is the principal, r is the annual interest rate, and t is the time in years. Calculate to the nearest hundredth of a year how long it takes for an amount of money ...
April 22, 2007

science
Put a pencil straight down into a glass of water. Notice whether the pencil looks bent. Now tilt the pencil and note how its apparent bending changes. How does this illustrate why light from objects near the horizon is refracted more strongly? Is the atmosphere thicker looking...
April 16, 2007

work force
a force of 10 pounds is required to stretch a spring of 4 inches beyond it's natural length. assuming hooke's law applies, how much work is done in stretching the spring from its natural length to 6 inches beyond its natural length. what i did so far: F(x)=kx 10=k4 k=5...
April 13, 2007

calculus
how do you calculate the instantaneous rate of change. is that the derivative. also: if f is the antiderivate of (x^2)/(1+x^5 such that f(1)=o then f(4)=? How would i find the integral of that? i don't even know what the first step is to get the answer. also, on this ...
April 13, 2007

calculus
is average rate of change and average value the same or will you get a different answer for each this is calculus so it's the mean average. it's using the formula and integrating. I dont understand your question, but I can assure you that average rate of change and ...
April 12, 2007

sum geometric series
what is the sum of geometric infinite series 3/2+ 9/16+ 27/128+ 81/1024=.... i know the formula is S=a/(1-r) my teacher, he usually transforms into a formula of the sum series and finds out a and r.but i don't how to do that. the pattern i saw is 3/2 + 3^2/2^4 + 3^3/2^7+ 3...
April 9, 2007

calculus pleas pleas help, derivates
what is the derivative of x/tan(x) and find f'(pi/4) f'(x)=(tanx-x*sec(x)^2)/(tanx)^2 That's the quotient rule for derivatives or as my teacher says: Low,low, low D'High, minus High d'low all over low square that's the quotient rule. It's a song ...
April 5, 2007

calculus please help
what is the integral of x/(1+x^2)^2 dx This is a question of a past AP exam of calculus BC i know i have to use the substitution method where u=(1+x^2), du=2xdx. I have to find the integral but i'm just focused on the coefficient because i get a different answer for that ...
April 4, 2007

chem
confused about this one. 2 samples of water of equal volume are put into dishes and kept at room temp for several days. the water in the first dish is completely vaporized after 2.8 days while the water in the second dish takes 8.3 days to completely evaporate. What can you ...
March 29, 2007

cavtities
i have to get my cavity removed and i was wondering if you can tell what they do. Will the dentist give you me injection? Will it hurt? How long does it take? What do they do to fix the cavity. Also can you give me couple of websites where a practice exam will be provided for ...
March 22, 2007

chem help
a scuba diver breathing normal air descends 100m of depth, where the total pressure is 11 atm. What is the partial pressure of oxygen that the diver experiences at this depth? Can someone help out on this question? Make a ratio: 11atm/1atm= P/partial pressureO2 at surface ...
March 19, 2007

chem
when a gas is collected over water, is the gas pure? No. It has water vapor in it.
March 19, 2007

calculus totally confused
find a first degree polynomial function p(1) whose value and slope agree with the value and slope of f at x=c. i think you use taylor series for this f(x)=4/sqrt(x), c=1 i'm totally confused on how to do it. i know you find the derivative but how do i get the function. ...
March 13, 2007

Chemistry
Sodium cyanide, empirical formula NaCN, is a solid which melts at 564 degrees C to give a liquid that conducts electricity. it also dissolves in water to give a conducting solution. Use these properties to deduce the type of bonding that holds this compound together. It must ...
March 11, 2007

music search help!
I was wondering if someone could help me find who were the popular women singers in the 1920s, 1930s, 1940s, and 1950s. You know the style of music that was playing in the movie Saving private ryan when the soldiers were waiting for the germans to come. You know that scene? ...
March 10, 2007

math
how do you check an answer if 4(j-7)=12 4j-28=12 -16=4j j=4 is this rite?how do you check if rite? It is wrong. When you add 28 to both sides, one gets 4j= 40 j= 10 in baseball, the pither's mound is 6 in. more than 20 yd from home plate . how many feet is this
March 1, 2007

chem
Consider the following reaction: 2 CH3OH + 3O2 to form 2 CO2 + 4 H20 Each of the following molecular diagrams represents an initial mixture of the reactants. How many CO2 molecules would be formed by complete reaction in each case? How do I use the molecular diagrams to help ...
March 1, 2007

history
what is socratic method? i heared a lot of different stuff!! IDEAS PLZ Thank you for using the Jiskha Homework Help Forum. This is "thinking critically" and that can be done by using guided questions. Here is a good definition: http://en.wikipedia.org/wiki/...
March 1, 2007

math--pre alg
not sure i did right 3(f+2)+9=13+5f 3f+6+9 = 13+5f +9 3F+15 = 12+5F GOT MIXED UP SOMWERE HELP 3f +6 +9 = 13 + 5f 3f + 15 = 13 + 5f 2f = 2 f = 1 drwls is correct You are doing OK up to this point: 3f + 6 + 9 = 13 + 5f Now combine any like terms. (We can combine 6 + 9 to equal ...
February 28, 2007

computer help commands
i'm in intro to technology class and i have to find the definition of the command "hostname" you use on the computer and i already found it so no problem but i also have to find examples and i looked on the internet such sites as computerhope and others. but i ...
February 24, 2007

Physics HELP!!!!!!!!
With: 2mg=mv3^2/r-mv1^2/r V3 being the speed at the top and V1 being the speed given at the bottom You get: V3^2=2gr+V1^2 sqrt(2*9.8*3.1+16^2) sqrt(316.76)=17.8
February 21, 2007

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