# Posts by David

Total # Posts: 2,272

**Chemistry**

Q1. What will be formed when propanone reacted with sodium hydrogensulphite? There is white precipitate is the resulting solution . Is it sodium carbonate? Q2. What are the difference in the products bewteen the reaction of ethanal and propanone reacting with 2,4-...

**French**

Please correct the verb tenses in the following paragraph Alceste, le gros copain de Nicolas, se passionne pour la nourriture. Chaque fois qu’il sort avec ses amis il a envie de manger. La semaine dernière ses amis et lui ont décidé d’aller au ...

**Financial management**

evaluates investment opportunities using payback. The finance director who has been with the company since its formation in 1975, has recently heard that this method may not be the best for evaluating long term projects. You have been brought in to advise the company and have ...

**English**

Leaving Home(the play)proves that the family structure is by far the greatest cause of people's social dysfunctioning. say why you agree or do not agree with this statement.

**math help me**

sorry because of misunderstood of the question. The above answer is wrong

**math help me**

case 1 : both bottle give red balls 1/2 * 1/2 = 1/4 case 2 : one bottle gives red ball 1/2 * 1 =1/2

**chem**

methanoic acid react with potassium dichromate to form what? A colorless solution and CO2 is formed as known

**math**

Find the first and third quartiles, Q1 and Q3, of the following set of numbers. 14, 4, 13, 18, 8, 15, 8, 3, 11, 8

**math**

-1/2- (-5/8)=

**math need help please**

-9 to the 2nd power - (-6) to the 2nd power

**Pharmacy Math**

The dose of gentamicin sulfate is 1.7mg/kg. How many mls of an injectable solution containing 40mg/ml should be administered to a person weighing 220 pounds? Any help is appreciated.

**Pharmacy Technician**

A physician prescribed 5mg/kg q day of a drug for a patient that weighs 132 pounds. How many 100mg tablets will be needed for a 2-week prescription?

**Need Help on this Microeconomics question, really**

If firms in perfect competition all pay the same price for resources and all receive the same price for outputs, how can they have different total profits or different profits per unit sold?

**Math**

Make up a data set of at least 12 numbers that have the following landmarks. Maximum : 18 Range : 13 ___________________________________ ___________________________________ ____ mode: 7 median: 12

**seventh grade science**

Thank you!

**seventh grade science**

Thank you. I looked it up in a dictionary, but I do not understand the terminology. Can you please explain it in a simpler language? Thank you.

**seventh grade science**

what is a monomer what is a polymer what is the structure of a protein

**Need examples of variable and fixed inputs (micro)**

I just need some example of fixed and variable inputs.

**Math**

Imagine there are 100 lockers. Each locker is given a number 1-100. When the students are assigned to their lockers, the 1st student runds down the row of lockers and opens every door, student #2 closes the doors of locker #'s, 2,4,6,8, etc. to the end of the line. Student...

**Microeconomics help please (urgent)**

True or False? Explain your reasoning. a. The short-run average total cost can never be less than the long-run average total cost. b. The short-run average variable cost can never be less than the long-run average total cost. c. In the long run, choosing a higher level of ...

**8th grade**

I went to an unscramble a word site and came up with this "Zach's Word Unscrambler" Results The scrambled word you entered was "afsedrniru " ... Sorry, No Matches Were Found...

**Microeconomics (margin Utility) need clarification**

Someone was kind enough to help me with this question, but i was still confused on how they helped me with the first part of my question. The original question was: You go to an auction and set a maximum price of $100 you are willing to bid on an item. However, you are ...

**Microeconomics help please (urgent)**

Thank you. I will remember the advice in the future:)

**Microeconomics help please (urgent)**

You go to an auction and set a maximum price of $100 you are willing to bid on an item. However, you are fortunate and purchase it for $50. 1) Does the lower price alter the marginal utility you originally placed on the item? 2) Is your potential total utility increased ...

**Math**

Let f(x) = 1/(x+7)+15/(x-8). Find all a for which f(a)=f(a+15). How do I solve this problem? I understand this so far f(a)=f(a+15) 1/(7+a) + 15/(a-8) = 1/(a+22) + 15/(a+7) I am lost after that This is a multiple choice question and I am not getting any of the choices a.) -161/...

**Formula help**

This is a multiple choice question and I am not getting any of the choices a.) -161/8 b.) 120/7 c.) 161/7 d.) -17

**Formula help**

Let f(x) = 1/(x+7)+15/(x-8). Find all a for which f(a)=f(a+15). How do I solve this problem?

**Help**

Now solve for speed of wind in the first equation.. 33km/time=32km/hr-speedwind. How do I do that?

**Physics**

You should start by listing the given information. vi = 0 vf = 100 m/s t = 12.5s a = (vf-vi)/t A). a = (100m/s - 0m/s)/12.5 s a = 8.00 m/s^2 B). You can use several equations for this question. I'm going to use: d = (vf + vi)/2 * t. d= (100m/s + 0m/s)/2 * 12.5 s d= 625m C...

**o-chem**

explain how the rate of crystal growth can affect the purity of a recrystallized compound

**o-chem**

explain how the rate of crystal growth can affect the purity of a recrystallized compound

**o-chem**

well im confused because you said one needs to be great and the other has to be poor. so if you combine both do you get a great solvent or a horrible one?

**o-chem**

thanks. i understand why e won't work, but im a little confused on choice a. they both dissolve a wide range of solutes so would it be a great solvent?

**o-chem**

Explain whether or not each of the following pairs of solvents might be useful as a solvent pair for recrystallization. (a) ethanol-methanol (b) hexane-cyclohexane (c) acetone-ethanol (d) water-ethanol (e) water-cyclohexane

**O- chemistry**

During a recrystalliztion experiment, a student allows the hot solution to cool to room temperature, then chills the solution in an ice bath. Is the student using correct recrystallization technique? Why does the student not simply chill the hot solution in an ice bath initially?

**AP US History**

1775 to 1800

**Re**

i need to find eveidence of 3 things that jesus did and 3 things jesus didn`t do. thanks!

**grammar**

What part of speech is the word "Below" used in the following sentence. Below the main level, we have a large playroom.

**education**

Just to take the very first term you've listed, are you suggesting that income is a characteristic of a multicultural school? What would that mean - that a multicultural school has income? And if so, is that what you're trying to say? I don't think it is, is it? Or...

**Calculus**

8/h -> infinity as h -> 0, so I don't see how the above expression can tend to anything other than minus infinity.

**Math**

Can I throw in a note of clarification? Melissa'a answers are actually correct: what's INcorrect is the algebra that apparently gave rise to them. As Bob pointed out, the "16 divided by 6" is actually a measure of inches per car, not cars per inch. Also, the ...

**algebra ll**

im having trouble with this problem 6( n - 4 ) = 3n

**Math**

No, I'm sure the problem is written like this: [(3a^3-27a)/(2a^2+13a-7)]/[9a^2/4a^2-1)] And to divide you multiply by the reciprocal. So i still don't get the problem I also know to factor, but I'm stil confused.

**Math**

No, I'm sure the problem is written like this: [(3a^3-27a)/(2a^2+13a-7)]/[9a^2/4a^2-1)] And to divide you multiply by the reciprocal. So i still don't get the problem I also know to factor, but I'm stil confused.

**Math**

I'm totally stuck on this problem!! Simplify: (2a^2+13a-7/3a^3-27a)(4a^2-1/9a^2)

**Algebra II/Trig**

No, Problem! Thank you so much for the answer!

**Algebra II/Trig**

Simplify: (n/4)/(n/m) As my answer I got: 4m Is this response correct? If not, please let me know what I did wrong.

**Math check**

No, you distributed the 4 to the y only. You also need to distribute the 4 to the 8. This would then make the answer 4y+32

**Math**

Simplify: 24w^7t^4/6w^9t^2 And How Exactly do u do this? I got 4w^16t^6

**Algebra II/Trigonometry**

Thank you so much drwls! I can not believe I did not figure that out!

**Algebra II/Trigonometry**

Simplify this problem: (1/2m^4n^5)^2

**English**

No. I think you should work the subject back in, in place of "it" and remove the "s" tacked on to the end of accomplishment

**math**

Can someone show me all the combinations possible with these things A B X Y LB RB LT RT L R U D

**math**

img59.imageshack.us/img59/4912/dsc00716qy7.jpg

**Physics**

A passenger on a train traveling 90km/h on a straight, level track notes that it takes another train (180 m long and moving with constant velocity) 4.0s to pass by. What is the velocity of that passing train relative to the ground? **please include explanation** thnx!!

**Chemistry**

Nope, Kristen is right. It can also be written as 4-methylpent-2-yne but it's the same thing.

**MAT 116 Algebra 1A**

V = 1/5 ð t^2 s

**Physics **PLEASE HELP****

plz ignore the 1st part just plz help with this: what's the relation between resistance and voltage?

**Physics **PLEASE HELP****

During a short circuit, why does the voltage go down? I know that the resistance is almost zero...but what's the relation between resistance and voltage?

**Geometry**

They are similar. because ALL triangles have and will always have 180 degrees. BOTH of the right triangles have an 90 degrees angle, which leaves 90 degrees left in both triangles than they have an another angle which is less than 90 (x degree) just by knowing this, you can ...

**english**

Do you need to write a paper about it? Please, clarify your question and it will bring more chances for you to get the good answer. Another way could be to order your paper from the writers at Prime Writing service.

**Chemistry**

For the following electrochemical cell: Fe(s) | Fe2+(aq) || MnO4–(aq), Mn2+(aq) | Pt(s) Which letter corresponds to the correct balanced chemical equation in an acidic solution? A. 2Mn2+(aq) + 8H2O(l) + 5Fe2+(aq)-> 5Fe(s) + 16H+(aq) + 2MnO4–(aq) B. Fe(s)+8H+(aq)+...

**Chemistry**

For the following balanced equation: 2Ag+(aq) + Cu(s)<->Cu2+ (aq) + 2 Ag(s) Which letter corresponds to the correct cell notation at standard state conditions? A. Cu(s) | Cu2+(aq) || Ag+(aq) | Ag(s) B. Ag+(aq) | Cu2+(aq) || Cu(s) | Ag(s) C. 2Ag+(aq) | Cu2+(aq) || 2Ag(s...

**chemistry**

The first step of the synthesis is described by the reaction below. When 1.200 g of Fe(NH4)2(SO4)2 6H2O is mixed with 13 mL of 1.0 M H2C2O4 , the theoretical yield of FeC2O42H2O is grams. Fe(NH4)2(SO4)26H2O(s) + H2C2O4(aq)-> FeC2O42H2O(s) + (NH4)2SO4(aq) + H2SO4(aq) + 4 ...

**math**

Astro Knots

**chem**

H2 + H2O ->??

**chemistry**

Because solution pH is a measurement of either [H3O+] or [-OH] concentration, the acidic or basic nature of the acids and bases used in this experiment can be ascertained by inspecting just the density (electrostatic) potentials from the products (which contain either H3O+ or...

**Chemistry**

What does the density potential (also known as the electrostatic potential) measure? What do the colors on the images indicate?

**chemistry**

calculate the equilibrium constant for the reactionas written at 940K. NH4Cl->NH3+HCl delta H= NH4Cl -1779, NH3 -46, HCl -92 delta s= NH4Cl - 682,NH3 192,HCl 187 i don't know how to solve for the equilibrium constant without the concentration of the values???

**chemistry**

The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.520. If a trial's absorbance is measured to be 0.275 and its initial concentration of SCN– was 0.00060 M, the equilibrium ...

**chemistry**

thanks

**chemistry**

The correct interpretation of the equation below is:? Fe3+(aq) + SCN¨C(aq)¡ú FeSCN2+(aq) A. The reaction is incomplete because the product is still charged. B. A heterogeneous equilibrium exists because of the charged ions. C. The equilibrium constant is Kc...

**chemistry**

the concentration of OH ions in a household ammonia cleaning solution is0.0035M. Calculate the concentration of H ions. would it be pH=-log (.0035)??? or Kc=1/.0035???

**chemistry**

If a solution is diluted, say by adding 100ml of solvent, does the number of moles of solute change? Does the concentration increase, decrease, or stay the same? i think it depends on what the solvent is, for example if its water then the concentration would decrease?? please ...

**Algebra 2**

A package with square ends has a combined length and girth (girth is the perimeter of a cross section) of 120 in. The surface area of the entire package is 3600 sq. in. Determine the dimensions of thr package. s in.*s in.*l in. one solution is: 11.08in*11.08in*75.68in. find ...

**chemistry**

how would i do something like this? Calculate the concentration of borate ion for each titration. Use the borate ion concentration to determine Ksp at each temperature.

**chemistry**

thanks soo much

**chemistry**

1)Does the solubility of borax in water increase or decrease as temperature increases? 2)Is the solvation of borax in water an exothermic or endothermic process? please help ive tried asking my ta but i cant understand him. he explains it through this weird process.

**chemistry**

Which of the following is NOT true of colligative properties? Colligative properties are... A. dependent on the mass of solute present. B. responsible for lowering the vapor pressure of a solution versus the vapor pressure of the pure solvent. C. independent of the chemical ...

**chemistry**

thanks sooo much

**chemistry**

When 18 g of ethylene glycol C2H6O2 is dissolved in 150 g of pure water, the freezing point of the solution is _C . (The freezing point depression constant for water is 1.86C kg) what i tried was 18/62 to find the moles. then i got .29/.150 to solve for the molality. then i ...

**chemistry**

thanks. sorry i go to ucla.hahaha

**chemistry**

Solid borax dissolves in water according to the equation: Na2B4O7 10H2O(s) 2Na+ (aq) + B4O5(OH)42–(aq) + 8H2O(l) The sign of Ssys will be A. positive B. negative because there are A. more B. less moles of products generated. i've tried solving this problem and i think...

**math riddle ALGEBRA WITH PIZZAZZ**

They are made for two wrists.

**Accounting Multiple choice**

ACON lTD ACQUIRES THE ASSETS AND ASSUMES THE LIABILITIES OF BIRD LTD WHICH HAVE OPEN MARKET VALUES OF A Assets $120,000 Liabilities $15,000 Acorn is to issue a debenture of $50,000 and 10,000 $1 Ordinary shares for the balance of consideration. What will be the credit to the ...

**math**

This cube has five cubes along each edge. The faces are covered, but the cube is hollow inside. Can it be divided into two pieces of equal volume? Explain. I am not sure what this question is asking? Does this look right? l x w x h= 5x5x5=125 125/2=62.5 Both sides have 62.5, ...

**chemistry**

d is the correct answer

**gr 7 math**

This cube has five cubes along each edge. The faces are covered, but the cube is hollow inside. Can it be divided into two pieces of equal volume? Explain. I am not sure what this question is asking?

**Calculus - Integrals**

I made this question, just wanted to make sure it didn't drown under the tide... I've set a problem up, something like this. s^4: A+D=0 s^3: -2A+B-3D+E=0 s^2: 2A-B+C+3D-3E=0 s^1: -2A+B-D+3E=4 s^0: A+C-E=4 Count Iblis -It's easier to substitute for s the values that...

**Calculus - Partial Integrals**

I'm confused. As soon as I get the so called 'Basic Equation,' I just don't know what to do after....

**Calculus - Partial Integrals**

The paragraph after the thing with s as a variable is copy and pasted from Count Iblis.

**Calculus - Partial Integrals**

I made this question, just wanted to make sure it didn't drown under the tide... I've set a problem up, something like this. s^4: A+D=0 s^3: -2A+B-3D+E=0 s^2: 2A-B+C+3D-3E=0 s^1: -2A+B-D+3E=4 s^0: A+C-E=4 It's easier to substitute for s the values that make the ...

**Calculus - Partial Fractions**

Would anybody mind showing it out? I tried what Count Iblis said, but it didn't really work out well...

**Calculus - Partial Fractions**

I'm sorry. I forgot to say that I don't know how to solve for A, B, C, D, and E... Help there would be appreciated.

**Calculus - Partial Fractions**

I've set a problem up, something like this. s^4: A+D=0 s^3: -2A+B-3D+E=0 s^2: 2A-B+C+3D-3E=0 s^1: -2A+B-D+3E=4 s^0: A+C-E=4

**Calculus - Integrals**

That's my problem. When I tried solving for A, B, C, D, and E in that first problem, it didn't really work out right...

**Calculus - Integrals**

1) A/x + B/(1+x) 2) A/x + B/x^2 + C/(1+x) I think I'm right....

**Calculus - Integrals**

I'm not quite sure about your explanation on Partial Fractions... And Liouville's Therom. We haven't done that in class... so...

**Calculus - Integrals**

I have 3 questions, and I cannot find method that actually solves them. 1) Integral [(4s+4)/([s^2+1]*([S-1]^3))] 2) Integral [ 2*sqrt[(1+cosx)/2]] 3) Integral [ 20*(sec(x))^4 Thanks in advance.

**Calculus - Integrals**

Could you expand on #1 a bit more? I tried Partial Fractions, but I couldn't get a definite answer...