Monday

April 21, 2014

April 21, 2014

Total # Posts: 68,225

**Math**

Does -7x^2+6x+3 have two real-number solutions?

**Algebra**

Do you mean 4*0.4? And how did you get positive 0.4? That was the part that confused me.

**Algebra**

How to solve y = -0.04x^2 + 1.3x + 56 using the quadratic formula?

**Algebra**

Solve the system of equations y=-2(x^2-1) y=2(x^4-2x^2 +1)

**AP Chemistry**

What is the entropy change for the vapor- ization of 2.2 mol H2O(ℓ) at 100◦C and 1 atm? H = 40700 J/mol.

**Algebra**

x+y^2=5 2x^2+y^2=6 Solve by elimination.

**Chemistry**

could it be at STP?

**Chemistry**

if a glass of ice water is at equilibrium, what is its temperature?

**Chemistry**

explain equilibrium in terms of the collision theory

**Plays**

So, basically character descriptions are not indented, right?

**Plays**

Are character descriptions such as the one below indented? [MARY looks nervous. She grabs her handbag and slowly leaves the house.]

**Plays**

When I'm writing the list of characters in a dramatic scene, are the names of the characters capitalized?

**Physics**

A stone is thrown in the air with an initial velocity of 50 m/s at 37 degrees to the horizontal. Find the total time the ball is in the air. What would be the total distance traveled?

**English**

If I wanted to describe the setting of a basketball court after a game, what are some things I might say?

**trigonometry**

how far from an 84 foot burning building should the base of the fire truck ladder be placed to reach the top of the building at an angle of 60 degrees with the ground. the ladder is mounted to the truck 8 ft off the ground

**probability math question**

a bag contanins 7 red marbles, 2 blue marbles, and 1 green marble. What is the probabilty of choosing a marble that is not blue?

**Plays**

Can a dramatic scene about a conflict in the story have just two characters?

**math**

I am sorry because I am really bad at math!! But after multiplying, I got 254.15, then I subtracted that by 10.00 and I got 244.15 now? Can you please explain to me what I have done wrong? :(

**math**

I got $15.41?

**math**

Anthony went to the store to buy soda. There was a sign that said, "15% off." The soda eas priced at $2.99 How much did the soda cost Anthony? If Anthony paid with a ten dollar bill, how much change did he recieve?

**Chemistry**

How to use the octet rule to predict the formula of the simplest compound formed from hydrogen and selenium, (Write the formula with hydrogens)?

**Chemistry **

What factors control the bond length in a covalent bond? Select all that apply. -It involves the attraction between the two nuclei involved in the bond. -It involves the attraction between the electrons in the bond and the nuclei of the atoms. -It involves the repulsion betwee...

**Chemistry**

Oo the solids have a delta G of zero!!!!

**Dramatic Scene**

If I have three characters in each column, then how would I follow those instructions?

**Dramatic Scene**

The thing is that my teacher said that the characters should come out in the order the come in the play, so it seems unclear about how to follow these instructions if I show the characters vertically.

**Dramatic Scene**

When writing a script for a dramatic scene, are the characters listed horizontally or vertically?

**Science**

1. Which of the following describes an example of land reclamation? A. After an area is mined for copper, the soil is replaced and new plants are planted B. After a forest is clear-cut, desertification occurs C. After a forest is clear-cut, it is mined for copper D. After an a...

**chemistry**

1. When performing this experiment, a student mistakenly used impure KHP to standardize the NaOH solution. If the impurity is neither acidic nor basic, will the percent by mass of acetic acid in the vinegar solution determined by the student be too high or too low? Justify you...

**math word problems**

A black pole 3 yd 2 ft long was 2 ft longer than a white pole. When part of the black pole was cut away, it was 1 yd 1 ft shorter than the white pole. How much of the white pole was cut away?

**Chemistry for health science**

Considering the neutralization reaction when nitric acid reacts with solid iron(II)carbonate. What is the minimum volume of 2.00 M HNO3 necessary to react completely with 1.06 kg of solid iron(II) carbonate, FeCO3 ?

**physics**

a bus starts from rest and achieves a velocity of 20m/s in 10s while moving westwards.calculate its avarage acceleration

**Exposition: How-to Essay (Writeacher)**

Should I write my essay in this format? 1. Determine your dominant eye (the eye from which one prefers to receive visual input). While this action might have been what you least expected, by determining your dominant eye, you will ultimately improve your accuracy and your abil...

**Exposition: How-to Essay (Writeacher)**

I have been assigned to write a 3-paragraph how-to essay. Should I number each paragraph? If not, why?

**economics**

2750?

**Acne**

Where is my post? Did someone remove it? :( :(

**physics**

See Previous Questions: Fri,3-21-14, 8:55PM.

**PLG 209**

Summarize the Bill of Rights (and Amendments 13-15). Discuss why they apply to criminal law

**english**

What are some websites that are against animal abuse & the actions they have taken to stop it. Thank you!

**Chemistry**

thank you

**Chemistry**

and if the salt would only be slightly soluble then it would still not be at equilibrium, correct?

**Chemistry**

an extremely soluable salt is added to water, and all of it dissolves. is it at equilibrium? explin.

**Math**

Solve the system using elimination. y = -x + 3 y = x^2 + 1

**Algebra**

Thanks!

**Algebra**

The number of visitors at a Web site over several days is shown in the table at the right. What is an equation that models the data? This is the given data: Days: 1, 2, 3, 4, 5 Visitors: 52, 197, 447, 805, 1270 How do you write the equation?

**focus high school**

What percentage of all infertile American women are infertile because of tubal damage caused by untreated STD?

**Expositon: How-to Essay**

I have been assigned to write an how-to essay that consists of 3 paragraphs. Should I number each paragraph?

**chemistry**

Calculate the molar conc. Of ethanoate acid needed to prepare ethonoic buffer of ph 6.8 using 0.5 molar solution of sodium ethanoic.pka of acid 0..127

**human biology cardiology**

The the right atrium lets blood flow to the right ventricle, which receives oxygen-poor blood. This blood goes to the lungs to get more oxygen. If the blood flows to the left atrium, the blood is not getting the oxygen it needs.

**Physics **

Consider two diffraction gratings. One grating has 3000 lines per cm, and the other one has 6000 lines per cm. Both gratings are illuminated with a beam of the same monochromatic light. Which grating produces the greater dispersion? Both gratings produce the same dispersion. T...

**Physics **

A single-slit diffraction pattern is formed on a distant screen. If the width of the single slit through which light passes is reduced, what happens to the width of the central bright fringe? Assume the angles involved remain small. The central bright fringe becomes wider. The...

**college physics 2**

this is the d sin(theta) = m (lambda) I am confused on what its asking now, isn't is d?

**college physics 2**

I had that the distance between interference fringes also decrease but I go it wrong

**college physics 2**

A double-slit diffraction pattern is formed on a distant screen. If the separation between the slits decreases, what happens to the distance between interference fringes? Assume the angles involved remain small. A double-slit diffraction pattern is formed on a distant screen. ...

**physics**

Two beams of coherent light travel different paths, arriving at point P. If the maximum destructive interference is to occur at point P, what should be the path difference between the two waves? Two beams of coherent light travel different paths, arriving at point P. If the ma...

**physics**

In a double-slit experiment, two beams of coherent light traveling different paths arrive on a screen some distance away. What is the path difference between the two waves corresponding to the third bright band out from the central bright band? The path difference between the ...

**Math**

I understand now. Thanks! How can I do it for linear data, such as the data below? x: 1,2,3,4,5 y: 248,307,366,425,484

**Math**

Write an equation to model the data. x: 0,1,2,3,4 y: 0,2.8,11.2,25.2,44.8 How do you do this?

**Reading**

well i need three subtopics to prove my thesis

**Reading**

yes

**Reading **

"Did you read his analysis in Sparknotes? What have you found about him by reading this novel? " he tries to see the good in everyone and never the bad he defends Tom Robinson Atticus practices the ethic of sympathy and understanding that he preaches to Scout and Jem...

**math**

regular selling price of A is 100. promo price of A is 85. New special price offered for A is 75. What will be the discount % of A

**Calculus **

A rancher wants to build a rectangular fence next to a river, using 100 yd of fencing. What dimensions of the rectangle will maximize the area? What is the maximum area? (Note that the rancher should not fence the side next to the river.)

**English **

I'm writing about hearing a certain song can take you back to a moment in your past. I know that the 1st paragraph is thesis and the 2nd is explain what song reflects on past and why. I don't know what i should in include in the 3rd paragraph

**Algebra**

Thanks Bosnian!

**Algebra**

Please explain how to do this problem. The answer says the answer is 2.43 inches, but I don't get it. A school wants to take out an ad in the paper congratulating a basketball on a successful season. The area of the photo will be half the area of the entire ad. The photo i...

**Science**

Explain residence time in relationship to reservoirs and fluxes

**Science**

Explain why residence time in the atmosphere for water is short but the flux in and out of the atmosphere is huge.

**please**

.

**please**

.

**please**

How many moles of Ca(OH)2 are needed to produce 82.9g of Ca3(PO4)2?

**research**

how did Epperson et al determine the validation of the MnSOST-R

**reading**

he tries to see the good in everyone and never the bad he defends Tom Robinson Atticus practices the ethic of sympathy and understanding that he preaches to Scout and Jem and never holds a grudge against the people of Maycomb he is a wise parent He stands rigidly committed to ...

**reading**

so i'm writing an essay what could be three subtopic i could write about of Atticus that deal with influence like how does he influence the townspeople and the kids? like respect for people what else?

**reading**

ok

**reading**

how? is it his children or the people in the town too?

**reading**

in to kill mockingbird which character influences others more?

**algebra**

For what value of x is the rational expression below equal to zero? X-4/(x+5)(x-1)

**Plays**

Suppose something like this is in the script of a dramatic scene: MARY.[Scared] I don't know what happened. Is it okay if I have a period after "scared?" I know it isn't required, but is it wrong or still okay?

**writing**

My research reports have often asked for three supporting details in each body paragraph. But I don't know if this helps.

**writing**

How many supporting details should you develop to back up your thesis?

**writing**

Which of the following does not belong in a conclusion paragraph?

**Geometry**

In triangle ABC ,if A=38degre,B=27degre,b=17m find a and c?

**Chemistry-Repost for DrBob222**

500 ml of a buffer solution with ph=2.10 must be prepared using .4 M HNO2 and solid KNO2. The ka value of HNO2 is 4e-3. a.) What mass of KNO2 should be added to 3 L of the HNO2 to make the buffer? b.) What is the buffer's pH after 150 ml of .5 M HNO3 is added? Your answer ...

**Economics HELP PLEASE!!!!**

Also sorry. 125 is wrong

**Economics HELP PLEASE!!!!**

Aldo 125. Answer should be positive

**Economics HELP PLEASE!!!!**

I think that is 250

**Economics HELP PLEASE!!!!**

Can someone please help me with a hint to solve this problem?? I'm struggling really hard with this. "Consider an oligopolistic market with two firms. Each of them produces using a cost function given by c(q)=q^2. The aggregate demand in the market is given by 1000...

**Chemistry**

Given that 20 ml of a weak acid (HA) was titrated with NaOH and the titration curve of pH vs titrant volume in ml is given, find the initial concentration of the acid? The problem gives the full titration curve starting at pH=2.2 at 0 ml added and with the equivalance pt at pH...

**Chemistry-Repost for DrBob222**

A sample of C60O3 decomposes with an activation energy of 50 kg/mol, an Arrehnius pre-factor of 2e10 s-1 and a k value of .04 s-1. How long does it take for a 25 mg sample at 25 degrees C to produce 10 mg. Your response was is that C60O<suh>3 or what? And I thought Arrhe...

**Algebra**

Thank you so much! I never spotted that I could clear the fractions like that :).

**Algebra**

2/3,-5/7 (x-2/3)(x+5/7) = 0 x^2 + 5/7x - 2/3x - 10/21 x^2 + 1/21x - 10/21 Is this right?

**Algebra**

Find a quadratic equation that has the numbers below as solutions. 1. 1/2,-10 2. 2/3,-5/7 How do I even do these problems? Those solutions are so hard to find.

**Language Arts**

I'd say A for the second one.

**Physics**

A train is moving at a speed of 30 m/s toward a stationary observer at a train station. The train whistle blows with an actual frequency of 336 Hz. What horn frequency is heard by the engineer (riding on the train)?

**PRE-CALC**

If the original coordinate axes are rotated 45° to obtain the x' and y' axes, what is the value of x in terms of x' and y'?

**Chemistry-Repost for DrBob222**

The reaction OH- + NH4+ = H20 + NH3 is kinetically first order in both reactants' concentrations. The rate constant is 2e10 1/M s. If 50 ml of .01 M NaOH is mixed with 50 ml of .01 M NH4CL, find the time required for the OH- concentration to reach 1e-4 M. Your answer: It s...

**Chemistry-Repost for DrBob222**

My question was: A saturated solution of MgF2 at 23 degrees C was prepared by dissolving solid MgF2 in 1 L water. The Ksp of MgF2 is 1.5e-5. a.)Calculate the mass of MgF2 dissolved. b.) When .1 mols of solid KF was dissolved in the MgF2 solution, precipitation was observed. Fi...

**Math**

What does Please Excuse My Dear Aunt Sally mean?

**Statistics**

An instructor hy pothesizes that the mean of the final ex am grades in her statistics class is larger for the male students than that it is for the female students. The data from the final ex am for the last semester are presented here. Test her claim using = 0.05. Ma...

**SEATTLE**

HELP

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