# Posts by David

Total # Posts: 2,277

**Algebra**

For this problem, tell whether each relationship is a direct variation. Explain. x | -3 | -6 | -9 | y | 18 | 36 | 54 | My teacher didn't really explain direct variation very well, but i did catch that you put x over y. (Hopefully this helps)

**chemistry**

I worked it out to need 8458.6K would this seem like resonable value? thank you for you're help

**chemistry**

I think charles law is needed were pressure and mole mass is constant, temperature and volume varies. Im stuck putting it all together.

**chemistry**

how do I calculate what temperature is needed to heat 52 grams of ethane to occupy 1200ml?

**physics**

An object is solid throughout. When the object is completely submerged in ethanol alcohol., its apparent weight is 15.2 N. When completely submerged in water, its weight is 13.7 N. What is its volume? Steps please.. answer isnt really necessary

**Physics/Chemistry**

few other questions. 1.) Suppose you expend 430 kilocalories during a long walk, how many liters of ice water at 0 degrees do you need to consume in order to use up the 430 kilocalories of metabolic energy. Stomach can hold 1 liter. 2. A person eats a container of strawberry ...

**Physics**

An object is solid throughout. When the object is completely submerged in ethanol alcohol., its apparent weight is 15.2 N. When completely submerged in water, its weight is 13.7 N. What is its volume? Steps please.. answer isnt really necessary

**Physics/Chemistry**

few other questions. 1.) Suppose you expend 430 kilocalories during a long walk, how many liters of ice water at 0 degrees do you need to consume in order to use up the 430 kilocalories of metabolic energy. Stomach can hold 1 liter. 2. A person eats a container of strawberry ...

**physics**

An object is solid throughout. When the object is completely submerged in ethanol alcohol., its apparent weight is 15.2 N. When completely submerged in water, its weight is 13.7 N. What is its volume? Steps please.. answer isnt really necessary

**C++ Programming**

Where would I find a great video resource for learning Visual C++ for beginners? I'm a newbie and I'm looking in some code for a project on sourceforge that i'm interested in. however, I don't know C++ so i don't know how to contribute to this program. ...

**math**

While on his way to school, Norman saw that the cost of gasoline was $2.50 per gallon. Write a direct variation equation to describe the cost y of x gallons of gas. Then graph.

**Chemistry**

Hi there, I am doing some data calculations for my lab, but I'm having some trouble. Given: Mass of ferrous ammonium sulfate=4.0g Mass of K3[Fe(C204)3] 3H20 =4.53g 1. Using the above mass of ferrous ammonium sulfate, calculate the theoretical yield of the K3[Fe(C204)3] ...

**Quick Question**

yes.

**math**

Writing in math, how can estimating help you add two-digit numbers?

**Chemistry**

Name these compounds (^these are symbolize subscripts) 1. CoCl^3 2. CrF^6 3. AgBr 4. Fe^20^3 5. CrF^3 6. TiCl^4

**Physics help**

A 1.0 kg object is suspended from a vertical spring whose spring constant is 105 N/m. The object is pulled straight down by an additional distance of 0.25 m and released from rest. Find the speed with which the object passes through its original position on the way up.

**Algebra 1**

o ok thank you

**Algebra 1**

write a function rule for each situation. The volume V(n) of a cube when you know the length n of a side.

**Chemistry**

Why do magnesium, phosphorus, and zinc exhibit slightly higher first ionization energies than the general trend within each of their periods?

**Chemistry Honors**

Hello, Can you please tell me how a fisher chart differs from a traditional chart?

**CHEMISTRY**

Hello, Can you please tell me how a fisher chart differs from a traditional chart?

**physics help**

A 5.00 kg ball (ball 1), moving to the right at a velocity of +4.00 m/s on a frictionless table, collides head-on with a stationary 7.60 kg ball (ball 2). Find the final velocities of the balls if the collision is as specified below. (a) elastic collision ball 1 ball 2 (b) ...

**economics (game theory)**

Consider the normal tick tack toe game, but this time you have to AVOID getting 3 in a row in any line. Is there any strategy you can tell me that will make sure the first mover doesnt lose. Thanks

**physics**

Water is flowing at 6 m/s in a circular pipe. If the diameter of the pipe decreases to five-seventh its former value, what is the velocity of the water downstream?

**chemistry**

predict the order of increasing acidity of the compounds. Give a brief explanation why. Butanoic acid-Nexanoic acid-Benzoic acid-Acetic acid. thx

**English**

which of the following words cannot use the suffix -ive? reveal- decis- conclus- impress-

**chemistry**

Can you tell me the geometry(around the carbon/oxygen atom) and whether this is polar or non polar CH3CH3? thx

**chemistry**

i need 2 lewis dot structures for C3H8O. thanks

**chemistry**

i need 2 lewis dot structures for C3H8O. thanks

**Science**

What do engineers do?

**science**

o ok thank u

**science**

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

**science**

Why are so much niches available on so much recently devastated islands?

**Algebra**

Factorise completely: 6x^2+10x-5= and 6x^2+8x-3=

**8th grade**

thank you

**8th grade**

how do seed banks preserve seeds for future generations?

**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 ...

**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 ...

**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...

**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

**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

**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?

**Physics**

The equation here is -8.4=.145(-32+V)

**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.

**8th grade**

you should do the work you bum rather then go and go find the answers

**Chemistry**

what's the answer?

**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

**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

**Statistics**

any help?

**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: ...

**statistics**

Could you rephrase that please, I'm not getting the logic.

**statistics**

any help?

**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

**Algebra I**

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

**science**

More oxygen will ___________ in colder water than in warmer water.

**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?

**Chemistry**

Oh thank you!

**Chemistry**

so did I do it right?

**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/...

**medical terminology**

which of the following is an example of a symptom?

**science**

microscope lens used to locate the specimen

**Biology**

not helping !

**Biology**

Eggs of Amphioxus is : (a)alecithal (b)telolecithal (c)meiolecithal (d)mesolecithal is it A ?

**Biology**

Human cell

**Chemistry**

the water will freeze

**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?

**10th grade**

A rational number is ____ a real number. a. always b. never c. sometimes its always ???????

**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 ...

**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.

**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.

**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 ...

**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 ...

**math**

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

**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...

**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 ...

**math**

This has been posted elsewhere, and is answered there.

**math**

This has been posted elsewhere, and is answered there.

**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 ...

**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...

**math**

What is the actual question please?

**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?

**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)

**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.

**science**

ops! b.the science of patterns and relationships

**science**

c.the science of numbers .???????

**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

**science**

????? Please help

**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

**9gr**

impossible

**8th Grade Algebra**

Ok. I wa thinking that! Thank you!

**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.

**8th Grade Algebra**

3m - 10 = 2(4m -5)

**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

**9th grade**

4g

**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

**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

**10th grade**

5x5x5x5=5^4

**Algebra**

3m - 10 = 2(4m -5)

**Science**

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

**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?