Wednesday

October 22, 2014

October 22, 2014

Total # Posts: 1,677

**World History**

Can you check my answer: Question: What were the key events that shaped Plato's beliefs? My answer: Plato was influenced by Socrates to search for the meaning of life. But after Socrates was executed Plato focused on how society would bring out the best in people.
*September 26, 2009*

**Calculus**

How would you find the derivative of f(x)=1/sqrtx using limits? I know how to do problems with a fraction or a square root, but I can't figure out how to do one with both. I have tried a few different starts, but always end up getting stuck.
*September 20, 2009*

**math**

Explain Why is1734 greater than175?
*September 17, 2009*

**arithmetic**

nth term expressions whose 8th term is 74
*September 17, 2009*

**Calc**

Oh! I've seen that equation we just don't call it a derivative. thanks!
*September 10, 2009*

**Calc**

what is a derivitive? And how do you get it (f(x)=2x) from f(x)=x^2-3?
*September 10, 2009*

**10th grade math**

Try making both 2 and 1 negative
*September 10, 2009*

**10th grade math**

Then you would use FOIL, and find which two numbers multiply to get 2, and add to get -3
*September 10, 2009*

**10th grade math**

do you know how to use the diamond? or were you taught with the FOIL square?
*September 10, 2009*

**Calc**

Thank you.
*September 10, 2009*

**Calc**

I don't understand how you got from lim (1+sinx/x)/(1+cosx/x) to the answer. I know that sinx/x is 1 so would the top be 2?
*September 10, 2009*

**Calc**

How do you find the lim as x->infinity of (x+sin(x))/(x+cos(x))??
*September 10, 2009*

**Calc**

How do you find the avarage rate of change for f(x)=1+sin(x) in the interval [0,pi/2]?
*September 10, 2009*

**Calc**

where did you get f(x)=2x??
*September 10, 2009*

**Calc**

How do you find the horizontal tangent for the equation f(x)=x^2-3? Algebraically
*September 10, 2009*

**calculus**

use inequslity notation to describe the set of any numbers. Define any variables you use. No item at Sarah's Variety Store cost more than $2.00. The price of a gallon of gasoline varies from $1.099 to $1.399. Need help please
*September 8, 2009*

**5th grade**

during an art contest at your school, you and a classmate each won blue ribbons for one-third of the pieces you entered in the contest. You won 2 blue ribbons and your classmate won 3 blue ribbons. Explain how this could be
*September 1, 2009*

**Science**

i dont know
*August 10, 2009*

**Math**

that's not right can someone please help.
*July 21, 2009*

**Math**

Please help me, thank you. A 100 kg astronaut is standing on the outside surface of a 4.50 x 10^4 kg spacecraft. The astronaut jumps away from the spacecraft at 8.00 m/s. What happens to the spacecraft?
*July 21, 2009*

**Math**

Can someone please help me. I don't get this question. Thank You In order to avoid a severe storm at sea a ship is set to sail 200 km at an angle of N40*E, then 150 km at an angle of S60*E. What is the displacement of the ship?
*July 21, 2009*

**French**

1. les quatre années dernières 2. je suis desolee. je ne sais pas. Vous avez [word for influence]... maybe?
*June 8, 2009*

**Math**

how do i tell the difference between a binomial distribution and a poisson distribution?
*June 8, 2009*

**Statistics-Concept Question**

i know how to use both poisson and binomial tables and i know the formulas for calculating means and standard deviations, i just have a hard time figuring out when i need to use the binomial formulas or when to use the poisson formulas.
*June 8, 2009*

**Statistics-Concept Question**

I have a stats exam tomorrow and I understand the material pretty well, but i sort of get confused. because my homework comes from a section, i know what formulas to use, but i took a practice test and i'm having a hard time identifying whether a problem is poisson or ...
*June 8, 2009*

**Marine Biology**

What zone is where most life exists?
*June 7, 2009*

**Physics**

i have no idea, i just wrote what the question said. but yes thats what i interpreted it to mean
*May 31, 2009*

**Physics**

I don't understand snell's law ( nsin(0)=nsin(0) ) and how to use it with refraction. also how do i apply that to this problem: 'a light ray enters a square piece of plastci (n=1.39) near a corner. as it encounters the adjacent side it gets refracted along the ...
*May 31, 2009*

**Math**

Can you tell me how you would answer this question? My teacher says that one answer is correct but I think that my answer is correct. I want a second opinion. A soccer coach purchases 12 uniforms for 17.50 each. He buys 6 soccer balls for 8.58. How much did he spend in all? I ...
*May 28, 2009*

**math**

Can you tell me how you would answer this question? My teacher says that one answer is correct but I think that my answer is correct. I want a second opinion. A soccer coach purchases 12 uniforms for 17.50 each. He buys 6 soccer balls for 8.58. How much did he spend in all? I ...
*May 28, 2009*

**social study**

President Obama
*May 28, 2009*

**geometry**

What is the formula for the area of a rhombus
*May 27, 2009*

**science**

compare the amount of energy used in the United states with the ammount used worldwide. Write a paragraph explaining the social and economic reasons for the difference
*May 27, 2009*

**Science**

What keeps cheese warmer? aluminum or plastic wrap?
*May 17, 2009*

**8th grade**

how do you simplify: 3x+6 ---- 3x^2
*May 11, 2009*

**Math**

Can someone please help me with this question. Thank you! The information in the table represents the temperature of a cup of hot chocolate in relations to time. Time(t) Temperature(T) 0 60 5 54 10 48 15 44 20 41 Use the exponential regression function in your calculator to ...
*May 10, 2009*

**Math**

Hi, I asked this question yesterday and I am still struggling with it, can someone please help me, thank you! State the image of the given point after the following transformation: (2,7) after a vertical stretch by a factor of 1/2 about the line y=1 followed by a horizontal ...
*April 26, 2009*

**Math**

Can someone please help me with this question. Thank you! State the image of the given point after the following transformation: (2,7) after a vertical stretch by a factor of 1/2 about the line y=1 followed by a horizontal stretch by a factor of 3 about the line x=3.
*April 25, 2009*

**French**

Could you please check these thanks. Directions: Complete with the verb mettre. 1. Qu'est-ce qu'ils -------- dans leur sac à dos? Ils ------------ Answer 1: mettent Answer 2: mettent 2. Qu'est-ce que tu --------- dans ton sac à dos? Je ---------- ...
*April 25, 2009*

**French**

Could you please check these thanks. Directions: Answer using the correct form of mettre. 1. Tu mets un survêtement quand tu fais du jogging? Answer: Oui, je mets un survêtement quand je fais du jogging. 2. Tu mets la table pour le dîner? Answer: Oui, je mets...
*April 25, 2009*

**Quick math question**

Thanks for the advice Mrs. Sue that's exactly what I'll do. I also make up problems by myself and have someone check them for me.
*April 24, 2009*

**Quick math question**

Can anyone give me a link to a free online algebra test for 9th graders. I have a test on Monday based on algebra to see if I can move on to Geometery and I need a test to see if I'm ready. Thanks
*April 24, 2009*

**Math**

the original problem was: Solve: sin(3x)-sin(x)=cos(2x) so far i've gotten to: sin(x)(2sin(x)cos(x)-1)=cos^2(x)-sin^2(x) Where would I go from here?
*April 23, 2009*

**Math, Pre-Calc**

the original problem was: Solve: sin(3x)-sin(x)=cos(2x) so far i've gooten to: sin(x)(2sin(x)cos(x)-1)=cos^2(x)-sin^2(x) Where would I go from here?
*April 23, 2009*

**Math**

Correct to the nearest tenth of a radian, state the x-intercepts and the y-intercepts for 0<x<2pi.
*April 19, 2009*

**math**

Hi! I really need help with this question. Please help me. Thanks! If f(x)=6cosx-1, algebraically determine algebraically the x intercepts to the nearest tenth. On the domain x E R.
*April 18, 2009*

**math**

Hi, Can you please help me. Thank-you. The present population of a town is 42000. a) Determine the population 4 years ago if the growth rate has been a constant 4%/year. b) Determine the number of complete years that have passed since the town first had a population of less ...
*April 18, 2009*

**word**

Physode.
*April 17, 2009*

**Applications**

Thanks!
*April 16, 2009*

**Applications**

I'm applying to the local Chamber of Commerce for a scholarship open to high school juniors to become ambassadors for our town, and it says that a cover letter and job resume are required. What should a cover letter be in this situation?
*April 16, 2009*

**Math - Pre-Calc**

So far I got it down to ((4/3)n^3+(11/6)n^2)/((4/3)n^3)+(2n^2)+(2/3)n). Would I be able to cancel out the ((4/3)n^3)s? So that it would be ((11/6)n^2)/((2n^2)+((2/3)n))? Or can I simplify that even futher by combining the (n^2)s?
*April 13, 2009*

**Math**

So far I got it down to ((4/3)n^3+(11/6)n^2)/((4/3)n^3)+(2n^2)+(2/3)n. Would I be able to cancel out the ((4/3)n^3)? So that it would be ((11/6)n^2)/((2n^2)+(2/3)n)? Or can I simplify that even futher by combining the n^2s?
*April 13, 2009*

**Math**

How would I begin to simplify this?? (4((n(n+1)(2n+1))/6)-4((n(n+1))/2)+n)/(4((n(n+1)(2n+1))/6))
*April 13, 2009*

**language arts**

Because all of the other days are week (weak) days.
*April 13, 2009*

**Math**

How do you find cos15
*April 7, 2009*

**Spanish**

also for the first one Adonde vas a comer cuando tienes hambre? for the answer you can have: voy al resturante
*April 6, 2009*

**10th grade chemistry**

How many molecules of Hydrogen gas formed when 48.7 grams of sodium added to water
*April 6, 2009*

**4th grade**

Geometry, Isoseles right triangle. Line segments MN and NO are ----? A. parallel lines, B. opposite angles, C. perpendicular lines, D. obtuse angles. I can't see that any of these are the answer to the question. Can you help me?
*April 6, 2009*

**Anatomy**

What accounts for more than 60% of the total bran weight? I looked in my book and it said one part accounted for 85% and then another part said 40%. I think it's the cerebral hemispheres, but I don't know for sure.
*March 29, 2009*

**kindergarten**

really just clap your hand gran mo ther son its 3
*March 27, 2009*

**WORLD HISTORY**

What element, found in all plants and animals, is used by scientists to determine approximate dates for an artifact’s age?
*March 25, 2009*

**Chemistry**

What is the equivalence point in an acid-base titration? I'm supposed to do a virtual lab online and it tells you to find the equivalence point, but I don't know if that means when the pH is 7 or when the indicator changes colors.
*March 24, 2009*

**english lit**

She stoops to conquer- Which characters represent the restoration period and which represent the sentimental?
*March 24, 2009*

**Spanish**

Thank you very much! I am still a little confused, but it makes much more sense to me than it did before!
*March 23, 2009*

**Spanish**

¿Qué le duele mucho a Andrea? I have: El estómago ha dolado mucho a Andrea. I'm not sure if the le has to be in the answer though because I don't really understand what the le means.
*March 23, 2009*

**Fluid Mechanics**

A supersonic wind tunnel is to be operated at M=2.2 in the test section. Upstream from the test section, the nozzle throat area is 0.07 m². Air is supplied at stagnation conditions of 500 K and 1.0 MPa (abs). At one flow condition, while the tunnel is being brought up to ...
*March 22, 2009*

**Fluid Mechanics**

A small rocket motor, fueled with hydrogen and oxygen, is tested on a thrust stand at a simulated altitude of 10 km. The motor is operated at chamber stagnation conditions of 1500 K and 8.0 MPa (gage). The combustion product is water vapor, which may be treated as an ideal gas...
*March 22, 2009*

**Fluid Mechanics**

A converging-diverging nozzle with a throat area of 2 in² is connected to a large tank in which air is kept at a pressure of 80 psia and a temperature and a temperature of 60°F. If the nozzle is to operate at design conditions (flow is isentropic) and the ambient ...
*March 22, 2009*

**Fluid Mechanics**

A large tank supplies air to a converging nozzle that discharges to atmospheric pressure. Assume the flow is reversible and adiabatic. For what range of tank pressures will the flow at the nozzle exit be sonic? If the tank pressure is 600 kPa (abs) and the temperature is 600 K...
*March 22, 2009*

**Math**

*CORRECTION* I am supposed to find the 4 vertices of the ellipse 1=(((x+1)^2)/4)+(((y-4)^2)/9) How would I go about doing that?
*March 9, 2009*

**Math**

My teacher told me the answers were (-1,7) (-3,4) (1,4) and (-1,1). But i just didn't understand how to do it, the bell rang.
*March 9, 2009*

**Math**

I am supposed to find the 4 vertices of the ellipse 1=(((x+1)^2)/4)+(((y-4)^20/9) How would I go about doing that?
*March 9, 2009*

**PreCalculus**

A kite has a lifting surface area of 630 square meters. Suppose the wind is blowing against the kite with a force of 100 newtons at an angle of 20 degrees above the horizontal. How much force is lifting the kite? I tried to draw a diagram, but I don't really understand ...
*March 8, 2009*

**Chemistry**

Thanks! That makes a lot more sense.
*March 8, 2009*

**Chemistry**

A student must make 500 mL of a 1.5 M HCl solution. The student has plenty of water and a stock solution of 6.0 M HCl to use. What volume of the 6.0 M HCl solution must be added to what volume of water to make the desired 500 mL of 1.5 M solution? I don't really know how ...
*March 8, 2009*

**English**

I am writing a character analysis of Laura from The Glass Menagerie, and I need to use quotations from the play. How do you cite these? Also, how do I know when to put a quote in a little indented paragraph thing of its own?
*March 1, 2009*

**French**

Can someone please explain to me the word "en", like why you would use it and it's different meanings? It seems like there's 50 ways to use it and I'm lost!
*February 26, 2009*

**Math**

I know the answer to this problem but I have no idea how to get there. Solve for all values of x if 0 is less than or equal to x, which is less than or equal to 2pie. (cosine squared of 4x) + (cosine of 4x)=0 The answer is: x= pie/8, 3pie/8, 5pie/8, 7pie/8, 9pie/8, 11pie/8, ...
*February 25, 2009*

**Math**

For the first problem all you have to do is add 3 hours to 10:00am.(count 10:00 to 11:00 (1 hour), 11:00 to 12:00 (2 hours), etc.) For the second problem just count backwarks 8 hours (i.e. 3 hours earlier of 5:30 would be 2:30 (5:30 to 4:30 (1 hour), 4:30 to 3:30 (2 hours), 3:...
*February 25, 2009*

**Math**

Sorry, it seems cutting from Word and pasting here doesn't work. again teh problem is. Solve for all values of c if 0 is less than or equal to x, which is less than or equal to 2pie. (cosine squared of 4x) + (cosine of 4x)=0 the answer is x= pie/8, 3pie/8, 5pie/8, 7pie/8, ...
*February 25, 2009*

**Math**

I have the answer to this question but I have no idea how to get there. Solve for all values of x if 0¡Âx¡Â2¥ð. cos©÷(4x)+cos(4x)=0 The answer I have is: x=¥ð/8, 3¥ð/8, 5¥ð/8, 7¥ð/8, 9¥ð/8, 11&...
*February 25, 2009*

**math**

1. (Tan ө + cos ө)/ (sec ө + cot ө) 2. (Tan ө + cot ө)/ sec ө
*February 21, 2009*

**math**

how do I simplify this? 1. (Tan ө + cos ө)/ (sec ө + cot ө) 2. (Tan ө + cot ө)/ sec ө
*February 21, 2009*

**Math**

How would you simplify and prove (csc x - cot x) = (1-cos x)/(1+cos x)? I've tried a lot of different starts, but I keep getting stuck.
*February 17, 2009*

**7th**

music is something you feel from the heart you have to feel the rythem or the beat of life.....
*February 16, 2009*

**year 8 Geography**

how does a river change from a source to the mouth
*February 15, 2009*

**statistics**

I dont understand how to answer this: relate the three measures of central tendency to a normal distribution- I looked it up online and it said that the mean, median, and mode are all the same but i dont understand how that can be
*February 12, 2009*

**Math/3rd grade**

They would have talked for 18 minutes twice of the usual time which would be 8 plus 10 because 10 minutes more so it would equal 18...... 4+4=8+10=18
*February 9, 2009*

**Physics**

Thanks a lot. I think it's great what you teachers do on this site. Very generous of you all to help us out.
*February 9, 2009*

**Physics**

I'm confused about significant digits in multi-step problems. If I have something like (7.004 +0.2230)/(15.1-0.033+12.07) do I first do the addition and round to 4 sig figs and then do the denominator and round to 2 sig figs and finally divide? Or do I just work everything...
*February 9, 2009*

**Algebra (urgent!)**

Find an equivalent inequality with absolute value #1: -5 < y < 5 #2: x < -4 or 4 < x I'm not sure at all how to solve this problem. Please walk me through the process. Thanks!
*February 3, 2009*

**Algebra 1**

Well, here's how to do it your way: First, to find the y intercept, plug in 0 for x. That means 5 times 0 - something equals five. That means that it must be negative 5. Then, put 0 in for y. 5 times something - 0 equals five, so obviously x is 1. Another way is to take ...
*February 3, 2009*

**Algebra (please help!)**

Find an equivalent inequality with absolute value #1: -5 < y < 5 #2: x < -4 or 4 < x I'm not sure at all how to solve this problem. Please walk me through the process. Thanks!
*February 3, 2009*

**math**

The y-intercept is 7. A way to know what is the y-intercept when you are in that form (slope-intercept form), it is the number that does not have an x next to it. To find the x-intercept, put 0 in the place of x and find what would be x to equal 0. Hope I helped!
*February 3, 2009*

**math**

Try to find the difference between each number. Notice that if you take 12 away from 16, you get 4, and the same if you take 16 away from 20. Therefore, the pattern is add 4. I hope I helped!
*February 3, 2009*

**Algebra**

Find an equivalent inequality with absolute value #1: -5 < y < 5 #2: x < -4 or 4 < x I'm not sure at all how to solve this problem. Please walk me through the process. Thanks!
*February 3, 2009*

**science**

I think the it was magnetic force that pulled them up, if I am recalling that correctly, because magnetic force is related to magnets. Sorry, I don't know how to help you with your second question. I hope I helped you a little!
*February 3, 2009*

**math**

First, distribute. Basically, multiply the 2 by 4 and by the -6. That makes it be: 5x + 8x + -12 + 2x Then, you can add all of the x's together to make it simplified, getting: 15x + 12 < 10 Then, take 12 away from each side, and divide by 5. I hope I helped you!
*February 3, 2009*

**accounting**

o How are entries made under each type of accounting? o How does each type of accounting handle depreciation, if at all? o How is inventory accounted for? o Are there any differences between the organizations that adopt a particular accounting method? o What are the strengths ...
*February 2, 2009*

**math**

Three students from grades 10,11 and 12 were elected to the student council. Grade 10: Tom(T), Sally(s) and Bill(B) Grade 11: Jerry(J),Anne(A)and Connie(C) Grade 12: Dan(D), Martha(M) and Gwen(G) A three member committee is to be formed with one person from each grade. All ...
*January 30, 2009*

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