Wednesday

September 2, 2015
Total # Posts: 910

**Chem**

4NH3(g) + 3O2(g) -> 2N2 + 6H20, K=10^80 @ certain temp initially, all the reactants and products have concentrations equal to 12M. At equilibrium, what is the approximate concentration of ammonia?
*September 28, 2010*

**Chem**

4NH3(g) + 3O2(g) -> 2N2 + 6H20, K=10^80 @ certain temp initially, all the reactants and products have concentrations equal to 12M. At equilibrium, what is the approximate concentration of ammonia?
*September 28, 2010*

**Chem**

4NH3(g) + 3O2(g) -> 2N2 + 6H20, K=10^80 @ certain temp initially, all the reactants and products have concentrations equal to 12M. At equilibrium, what is the approximate concentration of ammonia?
*September 28, 2010*

**Chemistry**

A newly discovered giant planet has an aver- age radius 12 times that of the Earth and a mass 722 times that of the Earth. Calculate the ratio of the new planet’s den- sity to the Earth’s density.
*September 14, 2010*

**math **

x^6 + 5x^3 – 24) ÷ (x^3 – 3)
*September 12, 2010*

**Chemistry**

Can i please get a formula to calculate the concentration of an acid when it reacts with a standard solution? ( preferably 0.1 M NaOH and viniger )
*August 5, 2010*

**math**

The angle of depression of two points on opposite sides of a building are on the same horizontal level with the foot of the buiding are 58 and 49 respectively from the top of the building. If the building is 38m tall, calculate the distance between the points.
*July 15, 2010*

**Calculus II**

1) Compute the indefinite integral: integral 2x ln(x^2 - 8x + 18) dx 2) Note that x^4 + 1 = (x^4 + 2x^2 + 1) = (x^2 + 1)^2 - (sqrt2x)^2 ... use this trick to compute the following indefinite integral as an elementary function (with exact coefficients). integral 1 / (x^4 + 2x^2...
*June 13, 2010*

**Calculus**

If two people are taking a dog on a walk and have two leashes. One is at 18 degrees with a force of 23lbs and the other is at 15 degrees with 27lbs, how hard is the dog pulling if it holds them at a stand still?
*June 3, 2010*

**Algebra**

Would someone please verify my answer for the solution set of (x+20)(x -10)(x+11)>0, {x|(-20,-11)<x<(10,infinity sign)}
*May 30, 2010*

**Algebra**

Would someone please verify my answer for the solution set of (x+20)(x -10)(x+11)>0, {x|(-20,-11)<x<(10, ‡)}
*May 30, 2010*

**Algebra**

I posted this before but could not understand the answer. How do I write the solution set of: {x| } for (x+20)(x -10)(x+11)>0
*May 30, 2010*

**Algebra**

I really appreciate your help. I am still a little confused, when I add -36 +9 -99 I get 126. I don’t understand the -72.
*May 30, 2010*

**Algebra**

For w-4/w-9 – w+1/w+9 + w-99/w^2 – 81 = ,I get: 14w-126/w^2-81 or 14w-14/w^2-9. Would that be correct?
*May 30, 2010*

**Algebra**

Sorry, this is making me crazy. Thank you for pointing out my error. w-4/w-9 – w+1/w+9 + w-99/w^2 – 81 =
*May 30, 2010*

**Algebra**

Thank you for answering (x+20)(x -10)(x+11)>0. How do I write the solution set of {x| }
*May 30, 2010*

**Algebra**

Can anyone help with this last question? 8v/v^2-49 + v/v-7
*May 30, 2010*

**algebra**

I don’t really understand this and it is on a test; w-4/w-9 – w+1/w+9 + w-99/w^2 – 18 = Can anyone give me a hint...please
*May 29, 2010*

**algebra**

OK what you say make sense but I am unsure of the solution sets of {x| }
*May 29, 2010*

**algebra**

Can anyone please help with this inequality,(x+20)(x-10)(x+11)>0 The solution set is {x| }
*May 29, 2010*

**Math**

How do I do 6y/5x + 3y/10?
*May 24, 2010*

**Math**

What is 2x + 6y = 12? I need to find y, the slope, and the y-intercept. Please help!
*May 24, 2010*

**math**

Two fractions equivalent to 2/5: 4/10 and 6/15. Two fractions equivalent to 7/11: 14/22 and 21/33 Two fractions equivalent to 150/325: 300/650 and 450/975. To solve this I multiplied each fraction by a number (e.g. 2/2) For 2/5, I did 2/5 x 2/2 = 4/10. I hope I helped!
*May 24, 2010*

**english**

what are the adjectives in this sentence. it was a wild, dangerous ride down the rapids in an old canoe.
*May 18, 2010*

**4th grade**

That is not a sentence.
*May 16, 2010*

**algebra**

1. x2+5x+6 2. x2+7x+12
*May 7, 2010*

**math**

Nth expression for the following:6,11,17,24,32.....
*May 5, 2010*

**calculus**

Let g(x)= integraton (top 3x, bottom 2) e^t^4 dt. Find the value of g'(0).
*May 2, 2010*

**math**

Hi, this is a worksheet problem so i do not have the answer to it. It came with a pic though. Here is the link. Thanks. img121.imageshack.us/i/dsc01000vu.jpg/
*May 2, 2010*

**english**

extrapolated
*April 27, 2010*

**english**

after studying the clues, sherlock holmes _____________ that the butler had committed the murder. reconciled endeavored extrapolated aquiesced infused
*April 27, 2010*

**english**

1 A 2 E
*April 27, 2010*

**english**

1. B 2. C
*April 27, 2010*

**english**

1) lassitude 2) D
*April 27, 2010*

**english**

1) Due to the _____ of the fire, the residents of surrounding homes were evacuated. (A) magnitude (B) consensus (C) laaitude (D) deportment (E) simulation 2) Sophia lives a(an) _________nieghborhood; many people have a similar_________- (A) prosperous.....occupation (B) ...
*April 27, 2010*

**english**

thank you
*April 27, 2010*

**english**

The boys ____ climbingup the ______ cliff,but decided it was too dangerous. (A) asecended....lethal (B) contemplated....sinister (C) endured....mundane (D) simulated....dreary (E) declined....obscure
*April 27, 2010*

**Physics**

Yes, it will. use equation: minimum thickness= wavelength(nm)/(4*index of refraction) so for your example it would be t=600/(4*1.25) which comes to 120nm. for the second part, use eq. 2t= ((m*wavelength)/index of refraction) so again 2t=((1*600))/1.44) and t= 208.3nm
*April 22, 2010*

**science**

what is the oort and were is it located
*April 21, 2010*

**chemistry**

65.2g
*April 10, 2010*

**spanish**

Form complete sentence using the imperfect: Cada semana/yo/asistir a/escuela primaria
*April 8, 2010*

**MATH**

You shouldn't search help on PROMYs questions...
*April 2, 2010*

**6th grade Language Arts**

That's the word that I'm not allowed to use. So If I use compromise in the second blank, I don't know what to use in the first blank.
*March 30, 2010*

**6th grade Language Arts**

that's what I thought, but what about the first blank?
*March 30, 2010*

**6th grade Language Arts**

We had a great difference of _______, we finally came (together) on the (opinion) that something needed to change so we made a _______ that each person could live with. I need to fill in the blanks that mean the same as the words in parenthisis. This is a stem homework project...
*March 30, 2010*

**Math**

Bob and his dad visited the hardware store on Saturday. They observed the following transactions: Mr. Harris bought 4 for $0.50, Mrs. Clarke bought 21 for $1.00, Mr. Montaro bought 1,134 for $2.00, and Ms. Park bought 450 for $1.50. What were they buying?
*March 25, 2010*

**math**

2x^3(x^2+2x)^-1/2 -(x^2+2x)^1/2 / x^2 the whole numerator is over x^2
*March 22, 2010*

**Advice on IB subjects**

Hey there all! Im desperate for some advice on my subjects at IB! I have decided on chem bio higher and english spanish standard. I am battling between Maths and Economics higher! I really like Maths and had decided to take it but now that I told people my options everyones ...
*March 21, 2010*

**Algebra 1**

Dumb teacher Mrs sue has no life when will we ever use any of this $hît. But anyway the answer is; it is tacks free. No spaces.
*March 9, 2010*

**chemistry**

What is the pH of the solution that results from mixing the following four solutions together? (1) 150. mL of 0.250 M NaCl (2) 300. mL of 0.200 M HCl (3) 100. mL of 0.050 M HNO3 (4) 450. mL of 0.200 M NaOAc any help is greatly appreciated!
*March 7, 2010*

**chemistry**

What is the value of [HCO3- ]/PCO2 for someone with mild acidosis, with a blood pH of 7.30? 1. 0.038 2. 0.38 3. 0.030 4. 0.30 5. 3.0
*March 7, 2010*

**chemistry**

Thanks a lot!
*March 7, 2010*

**chemistry**

Which of the following mixtures will result in the formation of a buffer solution when dissolved in 1.00 L of water? i) 0.50 mol HClO2 and 0.25 mol HCl. ii) 0.50 mol HClO2 and 0.25 mol NaOH. iii) 0.50 mol NaClO2 and 0.50 mol HClO2. iv) 0.50 mol NaClO2 and 0.50 mol HCl.
*March 7, 2010*

**6th grade math**

Operations for 9/2m - 8 = -5.5 + 4m? Please help
*March 4, 2010*

**math**

i need help rounding numbers. for example, 34.566 to the nearest hundreds.
*February 3, 2010*

**algebra**

2x^2-8x-42 over 6x^2 divided by x^2-9 over x^2-3x
*January 28, 2010*

**math**

2xsquare- 8x - 42 over 6x square divided by x square - 9 over x square - 3 x
*January 28, 2010*

**math**

a movie theater charges $7 for an adult's ticket and $4 for a child's ticket. on a recent night the sale of child's tickets was three times the sale of adult's tickets. if the total anount collected for ticket sales was not more than $2,000, what is the ...
*January 28, 2010*

**math**

four times the larger number of two numbers is equal to seven times the smaller.the sum of the numbers is 22.find the numbers
*January 27, 2010*

**algebra**

a-13whena=13.so33-13=20 that's the ans 3x+2y-2zwhenx=5,y=2,z=1.so3(5)+2(2)-2(1)=17
*January 27, 2010*

**9th grade**

How do you factor this expression? 10x+15
*January 24, 2010*

**Calculus**

Prove that the average of LRAM and RRAM is equal to TAM.
*January 24, 2010*

**biology**

explain the role of antigens and antibodies in natural and artificial control of diseases
*January 23, 2010*

**social studies**

Where did the pickle first originate?
*January 20, 2010*

**Algebra**

x + square root of 5 / x - square root of 5
*January 18, 2010*

**accounting**

“When in need, Google!” has become the single solution for all and any problem under the sun. Your accounting homework problems are no exception to this. By the time you settle down in college after finding campus routes, remembering locker codes and making new ...
*January 14, 2010*

**9th grade**

s8impliy this exponential expression): -2 7 -8 ) 6 -9)8 (7) * (x) * (w * (x *(4) * -3) (w
*January 6, 2010*

**algebra**

How do you do standard form
*January 6, 2010*

**social studies**

the ottomans adopted a policy of religious tolerance.why did they follow this path?The golden Age of muslim.
*December 15, 2009*

**Physics**

A football player kicks a football with an initial velocity of 30m/s at an angle of 55 degrees relative to the flat ground. a)what is the speed of the football at its highest point b)find the highes point reached c)find the total time in the air d)how far is the football ...
*December 13, 2009*

**math**

What multiplication fact can be found by using the arrays for 2x9 and 5x9?
*December 7, 2009*

**Physics**

Measured along the surface of the water, a rectangular swimming pool has a length of 15.9 m. Along this length, the flat bottom of the pool slopes downward at an angle of 16.9 ° below the horizontal, from one end to the other. By how much does the pressure at the bottom of...
*November 30, 2009*

**Physics**

The Mariana trench is located in the Pacific Ocean at a depth of about 11 000 m below the surface of the water. The density of seawater is 1025 kg/m3. (a) If an underwater vehicle were to explore such a depth, what force would the water exert on the vehicle's observation ...
*November 30, 2009*

**Physics**

Standing waves are set up on two strings fixed at each end, as shown in the drawing. The two strings have the same tension and mass per unit length, but they differ in length by 0.55 cm. The waves on the shorter string propagate with a speed of 41.8 m/s, and the fundamental ...
*November 30, 2009*

**Physics**

A string has a linear density of 6.7 x 10-3 kg/m and is under a tension of 210 N. The string is 1.6 m long, is fixed at both ends, and is vibrating in the standing wave pattern shown in the drawing. Determine the (a) speed, (b) wavelength, and (c) frequency of the traveling ...
*November 30, 2009*

**Physics**

The transverse standing wave on a string fixed at both ends is vibrating at its fundamental frequency of 250 Hz. What would be the fundamental frequency on a piece of the same string that is twice as long and has four times the tension?
*November 30, 2009*

**chemistry 11**

Hi, I am stuck on a couple questions in chemistry 11. The questions are 1. Calculate the number of moles of the anhydrous salt left behind 2. Calculate the number of moles of water removed by heat from your sample of hydrate. 3. Calculate the moles of water per mole of ...
*November 22, 2009*

**12th grade**

Can someone look over my admissions essay for Brown?
*November 21, 2009*

**math**

3,000 / 90 = 33.33 students per instructor 3,500 / 33.3 = 105.1 105 - 90 = 15
*November 11, 2009*

**english**

what does the prefix etym mean
*November 6, 2009*

**literacy**

i need to know which country these words came from caravan,yoghurt,sofa,dessert and shampoo
*November 6, 2009*

**artist**

1485 to 1489
*October 19, 2009*

**social economics politics**

debate the following proposition: "the countries of india and china have a "right" to pollute the environment until they catch up with more industrialized countries".
*October 12, 2009*

**4th grade Math**

34
*September 29, 2009*

**physics**

F=ma , T=ma T = (61kg)(9.81m/s^2) = ? N (do the math) Constant rate would mean there is no acceleration, so T = ma + m(0)== ma Furthermore, if the gymnast is climbing up at a certain acceleration, lets say 2.1 m/s^2, use the rate at which they climb for the acceleration in the...
*September 27, 2009*

**math**

how can i round each number to the place of the underlined digit?
*September 22, 2009*

**math**

how can i rounfd each number to the place of the underlined digit?
*September 22, 2009*

**7th grade**

waht is used to mix substances, like a spoon, is two words?
*September 3, 2009*

**science**

How do I diagram the four plant families? ( I remember rose family and pea family)
*August 18, 2009*

**Science**

What are the challenges of managing your chosen terrestrial resource issue?
*July 21, 2009*

**fractions**

i want to email you. please send email so i can send my math problems to you.
*July 19, 2009*

**Algebra**

In an arithmetic series, the terms of the series are equally spread out. For example, in 1 + 5 + 9 + 13 + 17, consecutive terms are 4 apart. If the first term in an arithmetic series is 3,the last term is 136, and the sum is 1,390, what are the first 3 terms?
*July 14, 2009*

**arithmetic**

N = the term number right?
*June 21, 2009*

**arithmetic**

How do you find the sum number of an arithmetic sequence? I forgot and my textbook does not explain it well.
*June 21, 2009*

**Chemistry UGH**

Help please! I can't solve any of these, would someone be as kind as to show me the answers? How many moles of NaHCO3 are in a 125.0 g sample of the compound? 3. How many moles are in 6.73 x 1024 water molecules? 4-5. AgBr, a chemical used in photography can be made with ...
*May 28, 2009*

**Chem**

If the rocket engine contains 1500.0 g of H2O2 and an excess of N2H4, what volume of water vapor will be produced when the rocket fires up to a temperature of 540oC and a pressure of 1.2 atm? I honestly dont GET this thing, ugh =( Please Help!!
*May 28, 2009*

**12th grade**

Penn Foster Examination #93051 Cooking Appliances I've gotten 16 out of 25 completed but I'll just post the whole exam to make sure I have THOSE right. Thanks for your help guys!
*May 23, 2009*

**Calculus**

YA i can't fingure out how to use it either im thinking that it could be the xi = a+x(change of x)
*May 5, 2009*

**math**

I have the number of gun deaths in 2005=36,038 2009=43,146 I think these are too high but I followed the equation to arrive at these numbers. Have I made a mistake? I cannot figure the 9,383 number into a year after 2000.Can anyone help me?
*May 2, 2009*