Tuesday

September 30, 2014

September 30, 2014

Total # Posts: 52

**pre calc**

A jeweler wants to make a 1 ounce ring composed of gold and silver, using $200 worth of metal. If gold costs $6000 per ounce and silver is $50 per ounce, how much of eat metal should she use?
*September 15, 2014*

**Pre Calc**

A bus trip of 90 miles would have taken an hour less if the usual average speed had been increased by 3 miles per hour. Find the usual average speed of the bus.
*September 15, 2014*

**Pre Calculus **

A motorboat travels 48 miles down a river in the same time it takes to travel 32 miles up the river. If the rate of the current is 4 miles per hour that is the rate of the boat still water?
*September 15, 2014*

**statistics**

At the start of December 2001, the retail price of a 25kg bag of cornmeal was $10 in Zambia, while by the end of the month, the price had fallen to $6. The result was that one retailer reported an increase in sales from 3 bags/day to 5 bags/day. Assume that the retailer is ...
*July 3, 2014*

**statistics**

in november 2008, apple stock dropped from $105 to $95 per share, and Microsoft dropped from $21 to $20 per share. If you invested a total of $3,570 in these stocks at the end of October and sold them for $3,250 at the end of November, how many shares of each stock did you buy?
*July 3, 2014*

**chemistry**

A student is working on a research project. The instructions in the book on how to prepare Ni(NH3)6Cl2 say that the percent yield in this preparation is 75.5 %. If the limiting reagent for the preparation is NiCl2·6H2O, and the student needs 50.0 grams of the Ni(NH3)...
*March 8, 2014*

**Physics**

Three lead balls of mass m1 = 16kg, m2 = 26kg, and m3 = 9.3kg are arranged as shown in the figure below. Find the total gravitational force exerted by balls 1 and 2 on ball 3. Be sure to give the magnitude and the direction of this force. magnitude N direction ° ...
*June 14, 2013*

**Physics**

A centrifuge can be used to separate cells from a liquid. To increase the rate at which objects can be separated from solution, it is useful to make the centrifuge's speed as large as possible. If you want to design a centrifuge of diameter 1.4 m to have a force of 128,000...
*June 14, 2013*

**Physics**

Consider again the problem of a car traveling along a banked turn. Sometimes roads have a "reversed" banking angle. That is, the road is tilted "away" from the center of curvature of the road. If the coefficient of static friction between the tires and the ...
*June 14, 2013*

**Perform the indicated operation and simplify**

X^2-2x-15/x^2+x-12*2x^2-6x/x^3+3x^2
*May 14, 2013*

**analytical chemistry**

A solution containing both Fe 3+ and Al 3+ can be selectively analyzed for Fe 3+ by buffering to a pH of 2 and titrating with EDTA. Th e pH of the solution is then raised to 5 and an excess of EDTA added, resulting in the formation of the Al 3+ - EDTA complex. The excess EDTA ...
*May 4, 2013*

**analytical chemistry**

A 10.00 mL aliquot of a solution of a weak acid , HA, whose pK a is 4.76 is titrated with OH - generated by electrolysis of water according to th e following scheme: 2 H 2 O + 2 e - â‡” 2 OH - + H 2 (a) [5 points] If the end point in the titration is ob served ...
*May 4, 2013*

**chemistry**

A solution containing both Fe 3+ and Al 3+ can be selectively analyzed for Fe 3+ by buffering to a pH of 2 and titrating with EDTA. Th e pH of the solution is then raised to 5 and an excess of EDTA added, resulting in the formation of the Al 3+ - EDTA complex. The excess EDTA ...
*March 26, 2013*

**Health**

The answer is D. If you would pay attention to the book that you have and read it you would understand this and not have to post questions like this anyway. The answers can always be found online too. Start reading if you want to get into healthcare
*March 2, 2013*

**English**

put periods in and on I wouldn't have answered the phone, if I had known it was him, who is him? The grammar needs to be worked on and the last statement needs rewording and leave out ase
*February 28, 2013*

**life orientation**

Read your book and/or look online
*February 24, 2013*

**math**

d = ?, r=23ft/sec, t=12 sec
*December 30, 2012*

**chemistry**

Reaction: CaCO3 + 2 HCl -> CaCl2 + CO2 + H2O Calculate the molarity of hydrochloric acid solution if an initial mass of 4.568g of CaCO3 was reacted with 25.0mL of the acid and 2.678g of CaCO3 remain after the reaction is complete.
*November 30, 2012*

**Calculus**

Apply Rolle's theorem if possible and find c if y=x^(2/3)-16
*June 24, 2012*

**Calculus**

Apply mean value theorem f(x)=7-(6/x) on [1,6]
*June 24, 2012*

**Chemistry**

I see what I was doing wrong now. Thank you very much!
*April 28, 2012*

**Chemistry**

Thanks, I understand the first part now but I keep getting the dilution part wrong.
*April 28, 2012*

**Chemistry**

also for 2. (part b) I found through M1V1=M2V2 that M2=8e-3 M acid. Then I did this: (8e-3 L)(8e-3M)=6.4e-5 mol acid. Next, I did the ICE table again and subtracted 1.7e-4 from 6.4e-5, and got -1.06e-4. I think I'm doing this wrong.
*April 28, 2012*

**Chemistry**

total volume=9.7e-4L .........HCl + NaOH ==> H2O + NaCl initial.8e-4....0........0......0 add...........1.7e-4................ change -1.7e-4 -1.7e-4 +1.7e-4 +1.7e-4 equil..6.3e-4...o......1.7e-4..1.7e-4 HCl:(6.3e-4 mol)/(9.7e-4 L)=0.6495 M and for pH I got 0.187 but it'...
*April 28, 2012*

**Chemistry**

1. A good indicator will have a(n)____ close to this volume and pH. I think it's endpoint but it's wrong. 2. (part a) What is the pH of the solution created by combining 1.70 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M ...
*April 28, 2012*

**Algebra**

The volume of a rectagular prism is x^3+3x^2-4x-12. The length is x+2 and the width is x+3. What is the height
*April 21, 2012*

**statistics**

I need an example of constructing a frequency polygon and have never used excel. I know what I'm supposed to put on the graph, I just don't know how to construct one on a computer.
*March 26, 2012*

**English Lit-**

thank you very much
*February 20, 2012*

**English Lit-Please recheck**

Then would the answer be Nature is at once wholly wild and wholly restrained or would it still be Nature must abide by the rules nature itself created because that sounds alot like your interpretation "Nature is restrained by the laws of nature." I'm still not ...
*February 20, 2012*

**English Lit-Please help**

We had to read An Essay on Criticism by Alexander pope and answers some questins. I spent my weekend trying to figure out one of the questions-Could someone please help "Those Rules of old discover'd, not devis'd Are Nature still, but Nature Medthodiz'd Nature...
*February 20, 2012*

**Chemistry**

If 0.0142 M aqueous Cl- is produced stoichiometrically according to the balanced equation in a reaction solution with a total volume of 1480 mL, how many mol of solid Ca3(PO4)2 are produced? 3 CaCl2(aq) + 2 Na3PO4(aq) → Ca3(PO4)2(s) + 6 NaCl(aq)
*February 17, 2012*

**Trig**

Solve Log[8](log[5]x)=0
*January 30, 2012*

**nat.sci.101**

what is the change in temperature of a steel if the linear expansion is 16m which was originally 10m at 10 degree celcius.
*August 10, 2011*

**math**

For the numbers from 100 through 199, how many have different digits in increasing order?
*May 4, 2011*

**math**

Alice is in a carpool with Sid, Raymond and Lucy. Sid will only sit beside his wife. Lucy won't sit in the front seat if her husband drives. Alice never sits in the front. The car seats only 2 in the front and 2 in the back. Who drives on Tuesday?
*May 4, 2011*

**economics**

Why is a negative income tax, by itself, unlikely to be successful policy for maintaining the living standards of the poor?
*November 26, 2010*

**chemistry**

how do I solve E = hc/lambda
*October 7, 2010*

**English**

I have three examples of platonic love in Romeo and Juliet - I need four. Thanks.
*January 18, 2010*

**Critical Thinking**

3.Strawman 4. Wishful thinking 8. invondidyrnvy sd hominem 10.red herring 11. post hoc 12.guilt trip 13. argument from outrage 14. ad hominem/genetic 15. group think
*August 6, 2008*

**math**

Seven times the difference of six and a twice a number yields the same result as the same number decreased by one.
*July 14, 2008*

**Algebra**

I'm sure how to work the following problems cant anyone help? 1) Write an equation for the parabola with focus (4,0) and directrix y=2. What do I need to do before I graph the following equations? e1) 16x^2+9y^2=144 e2) x^2/9 - (y+2)^2/9 = 1
*April 25, 2008*

**prefix and suffix**

redo
*March 2, 2008*

**science**

How can I convert 50 kg to pounds?
*December 7, 2007*

**psychology**

In a grand mal seizure, what happens to a person's brain? What can the after effects be?
*November 2, 2007*

**algebra**

Can someone tell me if this is correct: Find the value of the polynomial -x^2-3x-1 when x=-4 -1(-4)^2+3(-4)-1 -1(8)+(12)-1 -8-12+1 -20+1 =19 Is this correct??
*October 5, 2007*

**physics**

I have tried the ideal gas law to find the temp and Pressure so that i could then find the work but i am not getting the right answer in the end. any suggestions? 3.1 One kilogram of air in a piston-cylinder device undegoes a thermodynamic cycle composed of the following ...
*June 18, 2007*

**more thermo**

For the following question I was able to find the heat transfer and the entropy but I am having trouble finding the work done. When i solved delta E = Qnet - Wnet I got Win = Wout but Im not sure that is correct. I think that i need to solve for the final temp and pressure but...
*June 18, 2007*

**thermo**

For the following problem... I found the second pressure by solving P1V1/T1 = P2V2/T2. The Volumes is const so those cancel and then i am able to find the P2. From there i looked at the 1st law and came up with delt U = Qin which = mCvdelta T but that is where I am stuck. Can ...
*June 17, 2007*

**Thermodynamics again.**

For the following problem... I found the second pressure by solving P1V1/T1 = P2V2/T2. The Volumes is const so those cancel and then i am able to find the P2. From there i looked at the 1st law and came up with delt U = Qin which = mCvdelta T but that is where I am stuck. Can ...
*June 16, 2007*

**thermodynamics**

3.4 A heat engine operates between two heat reservoirs with temperatures of 560 and 280 K a) The heat engine itself has a temperature of 560 K during heat addition from the 560 K reservoir and a temperature of 280 K during heat rejection to the 280 K reservoir. The thermal ...
*June 15, 2007*

**English**

What words have ive on the end? Adjectives, nouns, and verbs: http://www.onelook.com/?w=*ive&ls=a =)
*March 26, 2007*

**genetic homework**

Albinism in humans is inherited as a simple recessive trait. Determine the genotypes of the parents and offspring for the following families. When two alternative genotypes are possible, list both. (a) Two nonalbino (normal) parents have five children, four normal and one ...
*February 11, 2006*

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