Monday

September 26, 2016
Total # Posts: 811

**2nd Order linear ODEs**

I'm having trouble solving this problem: For the equation x^(2)y′′ - xy′ = 0 , find two solutions, show that they are linearly independent and find the general solution. Hint: Try y = x^(r). I divided the equation by x^(2) first to simplify it, and then I...

*January 30, 2014*

**10th grade Science**

Explain, physiologically, how you would decide to use ice or heat on an injury? My book doesn't have any good info on this question. Is there a reputable website or article to get info to answer this question?

*January 24, 2014*

**Python: Creating function**

The value of the inventory of a particular book is the price of that book times the number of copies we have in stock. Write a function called inventory_value that takes a Book as its argument and returns the value of our inventory of that book. Then write a function called ...

*January 24, 2014*

**Python: Named tuples**

Nevermind, figured it out! :D

*January 23, 2014*

**Python: Named tuples**

I've been trying to print a list of the book titles within the named tuple in alphabetical order, but I don't know what I'm doing wrong. I've set up my named tuple as so: Book = namedtuple('Book', 'author title genre year price instock') # Book ...

*January 23, 2014*

**Integrating Factors**

I see, thanks!

*January 20, 2014*

**Integrating Factors**

I've been working on this hw problem for a while now, but I'm stuck in the integration process. I'm pretty sure I made an error, cause I can't seem to be able to integrate the right side of the equation. Q: (1/(x^(2)+1))y' + xy = 3 using the equation d/dx(...

*January 20, 2014*

**Math: Differential Equations**

Woops, wrong problem. The problem I need help is actually: Q: Is it possible to solve the equation y'=(xy)/(cosx) for y(0)=1? Sorry about that!

*January 15, 2014*

**Math: Differential Equations**

I've been stuck on this math hw problem for a while, I was thinking of taking the integral of the equation, but I've been messing up too much that I'm not sure anymore. Q: Is it possible to solve y'=x/(x^(2)-1) for y(1) = 0? Thank you!

*January 15, 2014*

**Math: Differential Equations**

I'm given y''= sin(x) with the initial conditions of y(0)=0 and y'(0)=2. I've already taken the integral two times to get an answer of y= -sin(x)+3x, however, I'm stuck as to how to make this equation in terms of x=... Please explain, I'd really ...

*January 14, 2014*

**English-Urgent please!**

Okay, thanks for the quick response!

*December 21, 2013*

**English-Urgent please!**

I mean the phrase rule sentence=Noun phrase, aux, verb phrase That is the phrase structural rule. I understand what you wrote but I can't connect it with what am trying to figure out. Can you please explain?

*December 21, 2013*

**English-Urgent please!**

I think I got it. The simple sentence phrase rule is used to combine compound sentences. Is this correct?

*December 21, 2013*

**English-Urgent please!**

What phrase structure rule creates coordinate structures? I am confused here. Is it prepositional phrases?

*December 21, 2013*

**English**

If com and pos can be separated just like able and ity, shouldn't I separate them now? I know com is a prefix but I didn't know pos is a root.

*December 21, 2013*

**English**

What is entailment in semantics? List three words (not necessarily related to each other) that evidence entailment and say what meanings each word entails. Can you explain the 3 words part of this question. Three random words?

*December 21, 2013*

**English**

I got: non, de, compose, able, ity. Is that correct?

*December 21, 2013*

**English**

nondecomposability? How many morphemes are in that word. I have five-non,de,ability,com,ity what about the pos?

*December 21, 2013*

**Physics**

Nevermind, I figured it out!

*December 7, 2013*

**Physics**

I've been trying to solve this problem for the longest time, but I still can't get the answer. The answer is apparently 36 degrees below the horizontal. Please explain!! (: A missile is launched from the ground with a speed of 100 m/s at an angle of 45 degrees to the ...

*December 7, 2013*

**Linguistics/English**

I also need help with figuring how to draw certain things like the 'of' and 'on' in the first sentence.

*November 22, 2013*

**Linguistics/English**

Hi, I need more help. I need to know if I diagrammed these sentences correctly. Edith drew some orange flowers on the side of the house. Edith......Flowers (drew,some,orange).......(On)......Side (the)...(Of)....House (the) Final:Noun, Noun, (preposition), Noun, (preposition...

*November 22, 2013*

**Linguistics/English**

Is there any difference? I don't know if its a trick question or if I really have two questions that are the same.

*November 21, 2013*

**Linguistics/English**

Girl (the, young), sent/wrote, Note (a, short), preposition, Mother (her)

*November 21, 2013*

**Linguistics/English**

There are two sentences that vary only by one word difference. Sentences: The young girl wrote a short note to her mother. The young girl sent a short note to her mother. My Answer: Girl sent/wrote Note ---to Mother -the -a -her -young -short The structure is:Noun, verb, noun...

*November 21, 2013*

**Linguistics/English**

I have an assignment about sentence diagramming. I need help. Any example given will be great.

*November 21, 2013*

**Solar Energy Please Help**

e is 14 and 14 again

*October 26, 2013*

**Biology**

single celled prokaryotes like the bacteria and archaea are the dominant and most diversified groups of living forms today. does this support their ancient origins? Explain

*October 20, 2013*

**Chemistry**

Hey guys! are you from 3.091x ? I wasn't aware that there was a exam, and now it is due in few hours. Can you help me out? Much appreciated. 1)Determine the minimum potential that must be applied to a proton so that, on interaction with a hydrogen atom, it can excite the ...

*October 12, 2013*

**CHEMISTRY**

1. For the ion Fe3+ what is the electron configuration and electron atrangement? please explain... i do not understand... 2. F- +. Br2----> Br- + Cl2----->

*September 27, 2013*

**Math**

How do you draw 56 degrees 10 minutes and 26 seconds on paper? protractor ? circle? clock? any website that helps this type of construction? the minutes and seconds threw me off....

*September 26, 2013*

**Math**

The least squares regression line is a unique line for each data set. True The least squares regression line minimizes the sum of the residuals. False

*September 19, 2013*

**ALGEBRA **

-32x^5y^4-24x^4y-16x^3y= _ _ _ _ Factor out: -8x^3y

*September 17, 2013*

**ALGEBRA **

-32x^5y^4-24x^4y-16x^3y= _ _ _ _ Factor out: -8x^3y

*September 17, 2013*

**Poetry/British Literature/12th grade **

Which of the following poems is a dramatic monologue? (A) "My Last Duchess" (B) "Love Among the Ruins" (C) Childe Roland to the Dark Tower Came (D) all of these

*August 27, 2013*

**College Algebra**

what is the equivalent logarithmic form of 6^z=244

*June 26, 2013*

**algebra**

I have no idea totally lost haven't done any type of math in almost 30 years f(x)= x^4-x^3-7x^2+x+6 all the real roots are bounded by -3 and 4. Explain why these are the upper and lower bounds

*June 24, 2013*

**algebra**

how do I find the relative maximum and minimum values of x^4-x^3-7x^2+x+6

*June 24, 2013*

**algebra**

solve x^4-8x^3+64x-105=0 given that 2-i is one solution. must be tired cause my steps are not calculating correctly

*June 24, 2013*

**math/algebra**

find the domain of the function 1) f(x)= log2( 49-x^2) 2) f(x)=In [1/x+5]

*June 23, 2013*

**math/algebra**

solve the equation log2(3x-2) - log2 (x-5)=4

*June 23, 2013*

**math/ algebra **

solve the equation log (4x)= log5 + log(x-4)

*June 23, 2013*

**Math/Algebra**

Sketch the graph of each piecwise-defined function. Determine the domain and range. Identify each point of discontinuity. f(x)= -x if x<0 4-2x if 0 <or= x<3 2x+1 if x >= 3

*May 28, 2013*

**Math/Algebra**

Find the vertex, Focus,and Directrix of the parabola. Graph the equation. y^2=12x

*May 28, 2013*

**Math/Algebra**

Graph the ellipse and locate the foci. 16x^2 +9y^2= 144

*May 28, 2013*

**Math/Algebra**

Find an equation for the ellipse described. center(0,0); major axis horizontal with length10; length of minor axis is 8

*May 28, 2013*

**Math/ Algebra**

Find an equation for the hyperbola described: 1) Vertices at (0,+/- 10); asymptotes at y= 5/3x 2) Vertices at (-+5,0); foci at (-+6,0)

*May 28, 2013*

**Math/Algebra**

A bridge is built in the shape of a semi elliptical arch. It has a span of 96 feet. The height of the arch 29 feet from the center is to be 10 feet. Find the height of the arch at its center.

*May 28, 2013*

**physics**

Hey can you please tell the numrical answer I can`t get it :)

*April 29, 2013*

**math algebra **

Factor the given expression. Then use the zero product rule and the quadratic formula to solve the problem. There should be three solutions to the equation. x^3-2197 x=

*April 16, 2013*

**math algebra **

Factor the given expression. Then use the zero product rule and the quadratic formula to solve the problem. There should be three solutions to the equation. x^3-2197 x=

*April 16, 2013*

**math algebra **

Factor the given expression. Then use the zero product rule and the quadratic formula to solve the problem. There should be three solutions to the equation. x^3-2197 x=

*April 16, 2013*

**ALGEBRA 2**

Factor the given expression. Then use the zero product rule and the quadratic formula to solve the problem. There should be three solutions to the equation. x^3-2197 x= PLEASE, help me with this one problem I am stuck on! THANKS!

*April 16, 2013*

**ALGEBRA 2**

Factor the given expression. Then use the zero product rule and the quadratic formula to solve the problem. There should be three solutions to the equation. x^3-2197 x= PLEASE, help me with this one problem I am stuck on! THANKS!

*April 16, 2013*

**Biology**

Humans have about 20,000 genes in our genome. Explain how cells differentiate into different kinds of cells even though they have the same set of 20,000 genes in their nuclei, so they are genetically identical.

*April 12, 2013*

**Maths**

its wrong steve

*March 19, 2013*

**Chemistry**

nevermind i got it

*March 16, 2013*

**Chemistry**

Hydrocinnamoyl chloride + AlCl3 --> ??

*March 16, 2013*

**Chemistry Equilibrium**

Which of the following conditions is always true at equilibrium? deltaG=0, Q=1, K=1, deltaG=deltaG(standard), deltaG(standard)=0, Q=0, deltaG(standard)=1 I'm so confused, please help!

*March 14, 2013*

**~*Math Probability*~**

Which expression would you use to figure out the number of ways you can arrange the letters in the word equation? (1 point) 8! 8P4 4P8 4! Five friends are having their picture taken. How many ways can the photographer arrange the friends in a row? (1 point) 150 100 120 80 How ...

*March 13, 2013*

**Calculus **

How would I solve the limit for this sequence. [n^(2)]*[1-cos(2.4/n)] I used L'Hopital's rule by putting n^(-2) in the bottom, but I got the wrong answer of -1.44 in the end. Please help, thanks!

*March 8, 2013*

**Chem Problem**

Nevermind, I figured it out!

*March 1, 2013*

**Chem Problem**

I need help solving this question, I have no idea what I'm supposed to do. What is the minimum pressure in kPa that must be applied at 25 °C to obtain pure water by reverse osmosis from water that is 0.165 M in sodium chloride and 0.029 M in magnesium sulfate? Assume ...

*March 1, 2013*

**Chem Problem**

I need help solving this question, I have no idea what I'm supposed to do. What is the minimum pressure in kPa that must be applied at 25 °C to obtain pure water by reverse osmosis from water that is 0.165 M in sodium chloride and 0.029 M in magnesium sulfate? Assume ...

*March 1, 2013*

**Language Arts**

That's what I thought too, but what if you only had to select one? Which one is more of a fact?

*February 28, 2013*

**Language Arts**

What fact does the author use to support her opinion about bleach? (1 point) 1. Bleach is a poison. 2. Bleach is an expensive part of processing water. 3. Bleach isn’t terrific to have around. __________________________________________ Note: This is not a question about ...

*February 28, 2013*

**Organic Chemistry**

thank you!!

*February 22, 2013*

**Organic Chemistry **

NMR: What can be said about proton spin decoupling? a) It depends on the number of attached protons. b) It slows the deshielding effects of π -electron circulation. c) It is the same as Distortionless Enhancement with Polarization Transfer. d) It is an instrumental ...

*February 22, 2013*

**ALGEBRA **

use the pythagorean theorem to find b when a=14 and c=y (triangle) b=

*February 17, 2013*

**ALGEBRA 2**

the airline cost for x thousand passengers to travel round trip from nyc to atlanta is given by C(x)= radical 0.3x+1 where C(x) is measured in millions of dollars and x> 0. find the airline's cost for 15,000 passengers (x=15) to travel from new york to atlanta. round ...

*February 17, 2013*

**ALGEBRA 2**

the airline cost for x thousand passengers to travel round trip from nyc to atlanta is given by C(x)= radical 0.3x+1 where C(x) is measured in millions of dollars and x> 0. find the airline's cost for 15,000 passengers (x=15) to travel from new york to atlanta. round ...

*February 17, 2013*

**algebra**

5 radical 5 and 9 radical 5 ____like radicals. a. are b. are not

*February 15, 2013*

**algebra **

the length of a rectangular photograph is 5in. more than the width. If the area is 50 in^2 what are the dimensions of the photograph? the width is__in. and the length is ____in.

*February 15, 2013*

**Chemistry**

How much energy as heat is removed from the hand when 5.00 grams of Ga initially at 20 degrees C melts? The value of Heat Fusion is 5.576 kJ-mol and the specific heat of Ga is 0.374 J-g-K. Take the final temp to be 29.76 degrees C.

*February 8, 2013*

**Chemistry**

How much energy as heat is removed from the hand when 5.00 grams of Ga initially at 20 degrees C melts? The value of Heat Fusion is 5.576 kJ-mol and the specific heat of Ga is 0.374 J-g-K. Take the final temp to be 29.76 degrees C.

*February 7, 2013*

**Physics**

A 69990 kg locomotive is traveling at 9.86 m/s when its engine and brakes both fail. How far will the locomotive roll before it comes to a stop? (The coefficient of rolling friction is 0.002.)

*January 22, 2013*

**English**

I can't find anything wrong. I know that an author isn't listed, but I don't see an example of how to properly cite with no author.

*January 22, 2013*

**English**

Is the below the correct way to cite an artical from a website in APA? I got marked off on my assignment for having it this way. Researchers at national institute of technology release new data on ethanol. (2013, Jan 18). Drug Week. Retrieved from (website URL)

*January 22, 2013*

**Physics**

A sailor climbs to the top of the mast, 12.55 m above the deck, to look for land while his ship moves steadily forward through calm waters at 4.63 m/s. Unfortunately, he drops his spyglass to the deck below. Where does it land with respect to the base of the mast below him?

*January 21, 2013*

**Physics**

A ball thrown horizontally at 22.76 m/s travels a horizontal distance of 46.81 m before hitting the ground. From what height was the ball thrown?

*January 21, 2013*

**English**

Thanks so much I was worried I would get hate posts you rock!!!!

*January 10, 2013*

**English**

HI, I need help on a question I have read both books 50 times now what is the difference between Barrio boy and no gumption please help. And if your going to hate please dont state thanks!!!!

*January 10, 2013*

**APUSH**

Please help! What event made the ratification of the Treaty of Versailles virtually impossible? a. The fact that Wilson had not taken any representatives from the opposition to France b. Wilson's open contempt for the opposition in the Senate c. Wilson's tactics of ...

*December 28, 2012*

**APUSH**

Race relations were _____ during World War 1: a. improved thanks to the efforts of government programs b. had moments of violence, but predominately improved material wealth for blacks in the north c.were among Wilson's top priorities; he had strong relations with W. E. B...

*December 26, 2012*

**SUPER SUPER SUPER NEED OF HELP**

What is the name of money is used in Haiti? What does the word? Why are there windows and portals on European banknotes? Look at all the countries whose money is straightforward. What they have in common? Is that the Canadian dollar has the same value as the U.S. dollar? I ...

*December 16, 2012*

**chemistry**

but answer is not right its not 5.00*10^22

*December 14, 2012*

**chemistry**

Chemical analysis of a silicon crystal reveals gallium at a level of 3.091×10−8 atomic percent. Assuming that the concentration of thermally excited charge carriers from the Si matrix is negligible, what is the density of free charge carriers (free carriers/cm3) in ...

*December 14, 2012*

**chemistry**

A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.35 kg m-3. Under these conditions the total surface area of the balloon is 0.57 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...

*December 14, 2012*

**chemistry**

You wish to increase the carbon content of a slab of steel by exposing it to a carburizing atmosphere at elevated temperature. The carbon concentration in the steel before carburization is 165.0 ppm and is initially uniform through the thickness of the steel. The atmosphere of...

*December 14, 2012*

**CHEMISTRY**

i cant get right answer pls help

*December 14, 2012*

**chemistry**

A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.5 kg m-3. Under these conditions the total surface area of the balloon is 0.72 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...

*December 14, 2012*

**chemistry**

The diffusion coefficient of silver (Ag) in copper (Cu) has the following values: T (K) D (m2s-1) 923 5.42 x 10-16 1173 1.34 x 10-13 (a) Calculate the activation energy for diffusion of silver in copper. Express your answer in units of J/mol.

*December 14, 2012*

**chemistry**

A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.5 kg m-3. Under these conditions the total surface area of the balloon is 0.72 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...

*December 14, 2012*

**chemistry**

(a) Cadmium telluride (CdTe) is a semiconductor witha band gap, Eg, of 1.45 eV. Calculate the value of the absorption edge of this material. Express your answer in meters.

*December 14, 2012*

**algebra**

X^2 x+15 ----- * ------ = X^2+7 x

*December 9, 2012*

**algebra**

X^2 * x+15 X^2+7 x

*December 9, 2012*

**chemistry**

All you do is just write out the equation onto the product side. B. NaNO3(s)→Na^+(aq)+NO3^−(aq) C. FeCl3(s)→Fe3^+(aq)+3Cl^−(aq) The same for D. You're Very Welcome!

*November 23, 2012*

**Physics**

Twice as massive.

*November 13, 2012*

**Chemistry**

the answer for b above is totally wrong, >= 3.

*October 29, 2012*

**Math**

$10

*October 24, 2012*