Wednesday
August 27, 2014

Posts by David


Total # Posts: 1,637

chemistry
i need 2 lewis dot structures for C3H8O. thanks
November 3, 2010

chemistry
i need 2 lewis dot structures for C3H8O. thanks
November 3, 2010

Science
What do engineers do?
November 3, 2010

science
o ok thank u
November 2, 2010

science
Yes,I'm asking for habitat niches. the island was devastated by volcanic activity.
November 2, 2010

science
Why are so much niches available on so much recently devastated islands?
November 2, 2010

Algebra
Factorise completely: 6x^2+10x-5= and 6x^2+8x-3=
November 2, 2010

8th grade
thank you
November 1, 2010

8th grade
how do seed banks preserve seeds for future generations?
November 1, 2010

chem.
CH3COOH + C5H12O -> C7H14O2 + H2O If the yield for the reaction is 45%, how many grams of the product are formed when 3.58 g of acetic acid are reacted with 4.75 grams of isopentyl alcohol? Millimoles of acetic acid= 59.6667 Millimoles of isopentyl alcohol= 53.9773 How ...
November 1, 2010

Chemistry
CH3COOH + C5H12O -> C7H14O2 + H2O If the yield for the reaction is 45%, how many grams of the product are formed when 3.58 g of acetic acid are reacted with 4.75 grams of isopentyl alcohol? Millimoles of acetic acid= 59.6667 Millimoles of isopentyl alcohol= 53.9773 How ...
November 1, 2010

physics
A 280 N force is pulling an 80.0 kg refrigerator across a horizontal surface. The force acts at an angle of 18.0° above the surface. The coefficient of kinetic friction is 0.200, and the refrigerator moves a distance of 8.00 m. (a) Find the work done by the pulling force...
October 28, 2010

math
How do I take the derivative in respect to c1 for the following utility function? u1 = log(c1) + log [1/2(x-c1-c2)] details please
October 26, 2010

math
How do I take the derivative in respect to c1 for the following utility function? u1 = log(c1) + log [1/2(x-c1-c2)] details please
October 25, 2010

Physics
Two identical cars are traveling at the same speed. One is heading due east and the other due north, as the drawing show. What is true regarding the kinetic energies and momenta of the cars?
October 24, 2010

Physics
The equation here is -8.4=.145(-32+V)
October 24, 2010

O Chem
I need help with this question please. Draw the structure of triacylglycerol formed from oleic acid, linoleic acid, and stearic acid. Give balanced equation and show how much hydrogen would be needed to reduce the triacylglycerol completely, show the product.
October 19, 2010

Chemistry
what's the answer?
October 11, 2010

intro to chemistry
A sample of nitrogen has a volume of 50.0L at a pressure of 760mmHg. What is the volume of the gas at each of the following pressures if there is no change in temperature? A. 1500mmHg B. 2.0atm C. 0.500atm
October 11, 2010

intro to chemistry
The air in a 5.00L tank has a pressure of 1.20atm. What is the new pressure of the air when the air is placed in tanks that have the following volumes, if there is no change in temperature? A. 1.00L B. 2500ml C. 750ml
October 11, 2010

Statistics
any help?
October 10, 2010

Statistics
A superstore manager wishes to give out a survey to a sample of 25 of its workers. It wants the sample to be a good representation of the workers. The table shows the numbers of workers in each section of the work force: Working tills: 32 Stacking shelves: 24 Office/managers: ...
October 10, 2010

statistics
Could you rephrase that please, I'm not getting the logic.
October 10, 2010

statistics
any help?
October 10, 2010

statistics
There are 50 members. Melvin wants to collect some infromation from seven of them. Explain how he can do this using the following set of random numbers: 86, 13, 84, 10, 07, 30, 39, 65, 97, 96, 88, 12, 39, 26, 04, 89
October 10, 2010

Algebra I
A rectangle has a width of 6x+7, a length of 13 How do I get the area?
October 7, 2010

science
More oxygen will ___________ in colder water than in warmer water.
October 7, 2010

Physics
In a cyclotron (one type of particle accelerator), a deuteron (of mass 2.00 u) reaches a final speed of 8.4% of the speed of light while moving in a circular path of radius 0.551 m. What magnitude of magnetic force is required to maintain the deuteron in a circular path?
October 5, 2010

Chemistry
Oh thank you!
October 4, 2010

Chemistry
so did I do it right?
October 4, 2010

Chemistry
A graduated cylinder massed at 34.56g and then 8.6 ml was added of an unkonwn liquid this brought the mass to 45.87g. What is the density? I'm not sure how to go about this. Is the 34.56g unneccessary information? Or, do you subtract 45.87-34.56= 11.31 then do mass 11.31/...
October 4, 2010

medical terminology
which of the following is an example of a symptom?
September 29, 2010

science
microscope lens used to locate the specimen
September 28, 2010

Biology
not helping !
September 23, 2010

Biology
Eggs of Amphioxus is : (a)alecithal (b)telolecithal (c)meiolecithal (d)mesolecithal is it A ?
September 23, 2010

Biology
Human cell
September 23, 2010

Chemistry
the water will freeze
September 20, 2010

Algebra
A certain can of iced tea contains 4% of the recommended daily allowance of sodium. The recommended daily allowance is 2500 milligrams. How many milligrams of sodium are in the can of iced tea?
September 20, 2010

10th grade
A rational number is ____ a real number. a. always b. never c. sometimes its always ???????
September 20, 2010

personal finance concepts
Donna and Sherman Terrel are preparing a budget for 2010. Donna is a systems analyst with an airplane manufacturer, and Sherman is working on a master's degree in educational psychology. The Terrels do not have any children or other dependents. Donna estimates her salary ...
September 20, 2010

Math
Hi - there are any number of them, but they're all infinite series: if you go to Wikipedia and look up "pi", you'll find at least fifteen of them in the "Computation in the Computer Age" section of that entry.
September 19, 2010

criminal justice
Follow Bob Pursley's link on the difference between Morals and Ethics in his response to "Ilisa" a little further down this list: it'll give you some help in at least defining the problem, if not some help answering it.
September 19, 2010

Statistics
a - either you've just seen something that's phenomenally unlikely, or the coin's owner isn't being truthful about the fairness of the coin. b - you've just seen something that's consistent with the coin's owner's pronouncement that the coin is ...
September 19, 2010

Statistics
The first thing you need is a random selection of graduates whose salaries can be compared... and that's probably the trickiest bit, because getting a genuinely random selection of graduates could more difficult than you might think. Suppose for example your subject is ...
September 19, 2010

math
Oops: I've got the last bit of the explanation of c) incorrect, but I'm sure you can correct it.
September 19, 2010

math
What fun! a) You can cancel out numbers that are common to the top and bottom of a fraction... but you can't cancel individual digits! b) These examples suggest that a/b + c/d = (a+c)/(b+d). Wrong! c) These examples suggest that {a+(b/c)} - {d+(e/f)} = {(a-d) + (b-e)/(f-d...
September 19, 2010

U.S. Government
A depressing, but no doubt accurate explanation. We have a similar system over here in the UK: it's been either "Heightened" or "Extreme" for as long as I've been aware of it - and now that you've spelt it out, I realise I'd actually assume ...
September 18, 2010

math
This has been posted elsewhere, and is answered there.
September 18, 2010

math
This has been posted elsewhere, and is answered there.
September 18, 2010

math
Do you mean how many separate pairings exist between two groups of objects, each of which contains eight elements? If so, the answer is (8 x 8) = 64. The reason I'm slightly cautious about the answer is that I'd have expected the second part of the question to be ...
September 17, 2010

PHI103: Informal Logic
I'll have a go at just the first one, because I think it illustrates a point that's worth making. Forget the multiple-choice options for a moment: concentrate on the original statement, which when you rephrase it slightly asserts that the only overdues at the store are...
September 17, 2010

math
What is the actual question please?
September 17, 2010

alegebra
Divide any whole number by any other whole number that isn't a factor of it. For example, try dividing 3 by 2. Is the result a whole number?
September 17, 2010

Algebra
A vehicle uses 1 tablespoon of gasoline to drive 125 yards. How many miles can the vehicle travel per gallon? Round your answer to the nearest mile. (hint: There are 256 tablespoons in a gallon)
September 16, 2010

Physics Flux
The electric flux through the surface shown in Figure Ex27.10 is 15.0 Nm2/C, and the electric field makes an angle á = 70° with the surface. What is the electric field strength? The surface is a 10cm by 10cm square.
September 13, 2010

science
ops! b.the science of patterns and relationships
September 12, 2010

science
c.the science of numbers .???????
September 12, 2010

science
What is the definition of Mathematics? a.adding and subtracting numbers b.the science of patterns and relationships c.the science of numbers d.a really hard subject
September 12, 2010

science
????? Please help
September 12, 2010

science
Which shows the expression below simplified? (3.6 × 10^15) + (1.8 × 10^12) a. 3.60018 × 10^15 b. 3.902 × 10^14 c. 3.618 × 10^15 d. 3.6018 × 10^15
September 12, 2010

9gr
impossible
September 12, 2010

8th Grade Algebra
Ok. I wa thinking that! Thank you!
September 9, 2010

8th Grade Algebra
I think that... 3m - 10 = 2(4m-5) 3m - 10 = 8m - 10 +10 on both sides but the thing is, I'm stumped when i get... 3m = 8m I don't think this is possible but I'm thinknig I'm doing something wrong here so that's why I posted.
September 9, 2010

8th Grade Algebra
3m - 10 = 2(4m -5)
September 9, 2010

9gr
1. At 11:00 a.m. a one-meter-high mailbox casts a 0.7-meter shadow. If a pole beside the mailbox casts a 28-meter shadow, how tall is that pole? 400 m 40 m 0.4 m 4 m
September 9, 2010

9th grade
4g
September 9, 2010

9th grade
Write an algebraic expression for the phrase. the product of g and 4 a.4g b.g + 4 c.g/4 d.g – 4
September 9, 2010

9 gr
Write each product in exponential form. 16 × 16 × 16 × 16 × 16 a.5^16 b.16^5 c.16^6 d.16^4 my answer 16^5
September 9, 2010

10th grade
5x5x5x5=5^4
September 9, 2010

Algebra
3m - 10 = 2(4m -5)
September 9, 2010

Science
An airplane flew a distance of 650 km at an average speed of 300km/h. How much time did the flight take?
September 8, 2010

physics
A truck is stopped at a stoplight. When the light turns green, it accelerates at 2.9 m/s2. At the same instant, a car passes the truck going 12 m/s. Where and when does the truck catch up with the car?
September 7, 2010

physics
A bike accelerates from 0.0 m/s to 4.1 m/s in 6 s. What distance does it travel? thanks for the help
September 7, 2010

physics
A bike accelerates from 0.0 m/s to 4.1 m/s in 6 s. What distance does it travel? thanks for the help
September 7, 2010

Algebra
Sorry I forgot to put in the answer. It's 2d +1/5 = 3/5
September 7, 2010

Algebra
2d + 1 fifth
September 7, 2010

5th Grade Math
I'm putting the answer on the right because that's how I'm used to it. so... (3*0.1) + (X) = 0.38 First we do the problems in parentheses. Since we are looking to find X we are not going to do that right now. (3*0.1) = 0.3. Now we subtract that from the equation. 0...
September 7, 2010

Algebra
this is 2d + 1 fifth. Sorry the formatting for this problem is incorrect.
September 7, 2010

Algebra
2d + 1 --- 5
September 7, 2010

Physics
3 There are two charges +Q and –Q/2 that locate at two positions with a separation of d as shown in Fig. 1. We may put +Q at the origin of the x-axis to facilitate the calculation. (a) Find the electric field for +Q and –Q/2 at the position P. (5 points) (b) What is ...
September 5, 2010

Physics
The figure below shows two pint charges, each of -2Q, fixed on the y-axis at y = +a and at y = -a . A third points charge -Q is placed on the x-axis at x = 2a . Express all algebraic answers in terms of Q, a, and fundamental constants. (a) What is the net force (magnitude and ...
September 5, 2010

math
Find the standard deviation for the data. Round your answer to one more decimal place than the original data. {15,13,31,42,58,78}
September 3, 2010

Finance
7,200 at 10% and 4,800 at 15%.
September 3, 2010

Math
( -4 ) 3 (----) ( 5 ) if you can't read that, negative 4, fifths, squared. -4/5 in parentheses.
August 31, 2010

G.A
What is the answer to the brainteaser NOMMAG
August 28, 2010

Chemistry
What is the freezing point of an aqueous 2.65 m calcium chloride (CaCl2) solution? The freezing point of pure water is 0.0ºC and Kf of pure water is -1.86ºC/m.
August 21, 2010

Algebra
So, I'm thinking based on the sites you given that... body temperature = rational number money owed = rational number home runs = whole numbers Is this correct?
August 21, 2010

Algebra
I have some understanding of this but not quite sure how to do the problem. Direction & problem below. Direction: Tell whether whole numbers, integers, or rational numbers are the most reasonable to describe each. Explain your answer. Problem: body temperature; money owed; ...
August 21, 2010

Algebra
Abby has four times as many pictures as Sally. Abby had 18 more pictures than Sally. How many pictures did each girl have?
August 11, 2010

Algebra
Bill has 12 more than three times the number of baseball cards Chyris has. Bill has 42 cards more than Chris. How many baseball cards does Chris have?
August 11, 2010

Algebra
Thank You Henry
August 11, 2010

Algebra
Randy, Sam, Tim and Will counted the number of puzzles they had solved in two months. Sam has solved twelve more than Tim. Randy had solved seventeen less than Sam.Will had solved twice as many as Randy. They have solved a total of 267 problems. How many puzzles did each ...
August 11, 2010

algebra
6/7s-3/4=4/5-1/7s+1/6
July 29, 2010

math
6/7s-3/4=4/5-1/7s+1/6
July 29, 2010

Physics (Static Friction)
When you take your 1300-kg car out for a spin, you go around a corner of radius 56.9 m with a speed of 15.8 m/s. The coefficient of static friction between the car and the road is 0.75. Assuming your car doesn't skid, what is the force exerted on it by static friction? I ...
July 28, 2010

C++ Programming
I already know how to use Visual C++ Express but I;m having a problem that I can not figure out. So, my problem is below. I go into Skript.rc Push F7 to build the RC script first. Output says... Fatal error RC1015: cannot open include file 'afxres.h' Other sources tell...
July 28, 2010

C++ Programming
Hello. I use Visual C++ 2010 Express and don't know why this is occuring. I go into Skript.rc Push F7 to build the RC script first. Output says... Fatal error RC1015: cannot open include file 'afxres.h' Other sources tell me to replace it with windows.h but then it...
July 28, 2010

Chemistry
A compound on heating gives a crackling sound, a reddish fume, and a gas which relights a glowing splint. the residue is reddish brown when hot and yellow when cold. What are- 1. the compound? 2. the fume 3. the gas 4. the residue?
July 27, 2010

math
sorry, i made a mistake, for mutually exculsive events, P(EnF)= 0, hence, from the previous equation, 0.3=0.2+P(F)-0 so P(F)= 0.1
July 27, 2010

math
Let P(F)= X since E and F are independent eveents, P(EnF)= P(E)* P(F) therefore, P(EnF)= 0.2X but P(EuF)=P(E)+ P(F)- P(EnF) 0.3= 0.2 + x - 0.2x x = 1/8
July 27, 2010

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