Questions Asked on
October 14, 2006

  1. Solvents

    Question: Each of the solvents given should effectively separate one of following mixtures by TLC. Match the appropriate solvent with the mixture that you would expect to separate well with that solvent. Select your solvent from the following: hexane,

    asked by Sheryl
  2. Rf values

    Question: Consider a sample that is a mixture composed of biphenyl, benzoic acid and benzyl alcohol. The sample is spotted on a TLC plate and developed in a dichloromethane-cyclobutane solvent mixture. Predict the relative Rf values for the three

    asked by Sheryl
  3. Calculus

    A plane flying with a constant speed of 14 km/min passes over a ground radar station at an altitude of 7 km and climbs at an angle of 45 degrees. At what rate, in km/min is the distance from the plane to the radar station increasing 2 minutes later? I know

    asked by Michael
  4. Calculus

    Suppose that you can calculate the derivative of a function using the formula f(x) = 2f(x) + 4x. If the output value of the function at x=4 is 3 estimate the value of the function at 4.012. Linear Approximation right? I'm not seeing an f'(x) anywhere. Can

    asked by Michael
  5. economics

    Q: The market demand and supply curves for an agricultural product are as follows: Qd = 4500-250P and Qs = 200p where quantities are in thousands of bushels per annum and price is in dollars per bushel. the government wishes to acheive a higher point on

    asked by ratboy
  6. Physical Chemistry HELP!!!!!

    A solution of the sugar mannitol ( molar mass 182.2 g/mol ) is prepared by adding 54.66 g of mannitol to 1.000 kg of water. The vapor pressure of pure liquid water is 17.54 torr at 20o C. Mannitol is nonvolatile and does not ionize in aqueous solution. a.)

    asked by Lan

    The measured osmotic pressure of seawater is 25 atm at 273K. a.) What is the activity of water in seawater at 273 K? Take the partial molar volume of water in seawater to be 0.018 M-1. b.) The vapor pressure of pure water at 273 K is 4.6 torr. What is the

    asked by Amy
  8. History

    Hi, I'm doing a History Project on the First Emperor of China, Qin Shihuangdi, and wondered if anyone could tell me when he was born and when he died? I have been on lots of websites but the dates are all in the wrong order, making it look like he died

    asked by Paige
  9. English subect/verb agreement

    Which of the following sentences does illustrate subject-verb agreement? 1. Tricia,as well as all her colleagues, are being trained on new equipment. 2. Here comes your teachers. 3. That box of two dozen eggs need to be put in the refrigerator. 4. The

    asked by Anonymous
  10. Please Please help! English

    Which of the following sentences DOES NOT illustrate subject- verb agreement. 1.Each of the players need a locker. 2.He said that the computer is broken. 3.There go the members of the cast. 4.We knew that rivers flow south. 1.Each of the players need a

    asked by Anonymous
  11. science

    what product is left when dilute sulphuric acid and zinc go together? (Broken Link Removed) dissolved in water, of course, the water that was carrying the H2SO4.

    asked by monty
  12. economics

    Thank you so much economyst but i do'nt understand the ans for part (b) The demand function for a well known economics textbook is: P = 100 - .005Q The publisher must pay $20 per book in printing and distribution costs and, in addition, it must pay the

    asked by tinky
  13. microeconomics

    John purchases 12 CDs and 15 cheese pizzas in a typical year. If cheese pizzas are inferior goods, would Mike be indifferent between receiving a $30 gift certificate at a local music store and $30 in cash? Please explain. Thanks

    asked by Henry
  14. science

    I have to have three alternative ways to maximize food production in a developing country I am going to try and do Haiti They have had some major environment problem like soil erosion and deforestation I feel the food production can be helped if they had a

    asked by Todd
  15. Poetry, part 2

    Hopkin's use of "seared", "bleared", and "smearded" is an example of You are probably looking for a grammatical which my mind is blank. But in poetry, rhythm usually sets the poem style, the use of seared, bleared, and smeared is the poetic

    asked by bio
  16. History-Armenian Genocide

    why is the Armenian genocide significant? can the international community prevent future genocide from happening? This site gives some excellent information. To consider the second part of the question, you

    asked by Katrina
  17. Graphs

    x + 2y = -4 How do I graph this?can you please help? Assign values to x and solve for y or assign values to y and solve for x. Makre a table. X........Y 0........-2 2........-3 etc. I almost always assign a value of zero to Y, too, and calculate X. Y = 0;

    asked by Margie
  18. Graphs 2

    x = -3 y = 2 how about this?how do i graph it? Is this a single point? no it says that Graph numbers 4 and 5 on the same square of graph paper. Make sure you label each line. x = -3 y = 2 Others may be able to answer this better than I; however, x = -3

    asked by Margie
  19. MSDS sheet

    Does anyone know where I can get a free MSDS sheet WITHOUT giving my complete biography? I don't mind an email address and even a name but land mail address, phone number, number of adults in household, cars in household, fax number, and other garbage is

    asked by DrBob222
  20. Research Paper

    I writing a paper on teenage driving should the age be 18? I need help on my methodology page What is a methodology page? I don't know if this helps but check on google The methodology is the method you will you to solve the problem. In this case, how you

    asked by Shuntay
  21. Please HELP!!!!! I need to finish this by 12:30!!!

    PLease Help!!My teacher is coming to pick this up at 12:30!!! Then don't waste your time pleading. Are you cheating on a test or something?

    asked by Margie
  22. Slopes

    Given y = 2x – 4, choose the statement that accurately describes this line. The slope is 2 and the y intercept is 4. The slope is 2 and the y intercept is -4. The slope is 4 and the y intercept is 2. The slope is -4 and they y intercept is 2. The

    asked by Margie
  23. Slope

    The slope of the line that passes through (2, -4) and (-6, 2) is: -4/3 3/2 1/4 -3/4 Remember, the slope is change in y divided by change in x, so, a slope of 3/2 for example, means that the line goes "up 3 and over 2"

    asked by Margie
  24. graphs

    x = -3 y = 2 how about this?how do i graph it? x = -3. This means, no matter what y is, x is -3. So, it's a vertical line at x = -3.

    asked by Margie
  25. graphs2

    x + 2y = -4 How do I graph this?can you please help? I answered this below. If you are having trouble you must tell us exactly what the problem is. What don't you understand about taking the next step? that is the problem.I got the other one but how do i

    asked by Margie
  26. Algebra1

    Complete this sentence with the correct choice: y = 4 is a horizontal line with ________. undefined slope. a slope of 4. a slope of 0. None of the above will make a true statement. Draw a line through y = 4 and parallel to the x axis. Now, what slope is

    asked by Margie
  27. PLz!!!My teacher gave me 10 more plz help!!

    I really need help!! My advice is to spend some time reading our answers and less time pleading for more help. The time you take to type a plea for more help can be used for following our suggestions. DrBob222 is right. Graphing is very important, and we

    asked by Margie
  28. Algebra

    What would be the missing piece of information given the following information: Find the slope of the line that passes through the points (2, 6) and (4, 10). m = ? a. 2 b.6 c. 1 d. 9 I think it is c. Remeber the definition of a slope. It is the change in y

    asked by Margie
  29. Algebra

    What would be the missing piece of information given the following information: Find the slope of the line that passes through the points (2, 6) and (4, 10). m = ? a. 2 b.6 c. 1 d. 9 I think it is c. m = change in y over change in x m= (10 - 6)/(4 - 2)

    asked by Margie
  30. Algebra ??

    What would be the missing piece of information given the following information: Find the equation of the line that passes through the points (2, 6) and (4, 10). y = 2x + ? a. 4 b. 2 c. 7 d. 5 OK. let's take this step by step. y = 2x + ? Remember the

    asked by Margie
  31. social studies

    I need names of twenty famous people in world history, who are not americans. Here is web site that will not get 20 but will get close. The disadvantage is that all of them are from or lived in a small town AND it was years ago. You may want newer faces.

    asked by marcus
  32. Algebra2?????

    What would be the missing piece of information given the following information: Find the equation of the line that passes through the points (3, -1) and (2, 5). y = -6x + ? 17 15 20 11 Good. Try this one just like we did the last one...let me know how you

    asked by Margie
  33. Please help with English!!!

    Which one of the following sentences does not contain a serious verb error? 1. They staying there now. 2. She want a promotion. 3. If I was younger, I'd pursue another line of work. 4. We had sang that hymn last week. Cheryl, if you read those out loud,

    asked by Cheryl
  34. Algebra3!!!!

    How would you would graph the linear equation y = -2x + 6? First plot the point (6,0) and then count up two and to the right 1. First plot the point (6,0) and then count down two and to the right 1 First plot the point (0,6) and then count up two and to

    asked by Margie

    Half the apples_________ on the floor, but some of them ________ on the table. are, are is is is are, are is We could neet the man who _________ all loans if the manager _________ here. approves, was approve, were approve, was approves, were Half the

    asked by Kallie
  36. Algebra111111!!!

    Choose the ordered pair that is a solution to the system of equations. -x + y = 12 x + 2y = 3 a. (7, 5) b. (5, -7) c. (-7, 5) d. (-7, -5) e. none of the above This question wants you to find the point of intersection of the two lines, provided they're not

    asked by Margie
  37. math

    If you swim 2 miles in 40 minutes, what is the unit rate? If you use distance=rate*time, then rate =distance/time So 2mi/40min or simplifying to 1 mi per 20min Can you convert this to mile per hour?

    asked by LIndsey
  38. Algebra22222!!!

    Choose the ordered pair that is a solution to the system of equations. 3x - y = 10 -x + y = -4 (3, -7) (-1, 3) (3, -1) (3, 1) Follow the example I gave in your previous question. I'm not going to do all of them. You want to eliminate one of the variable

    asked by Margie
  39. Algebra333333!!!

    Choose the ordered pair that is a solution to the system of equations. 3x - y = 9 2x + y = 6 (3,0) (3,-18) (3,-1) (3,1) Once again add the two equations to get 5x = 15 Solve for x and substitute into either equation to find y.

    asked by Margie
  40. To regular teachers

    In trying to help Margie with algebra, it required intensive, step-by-step process. It would certainly be alot more efficient if there were a way to provide instant messaging in a situation like this. Is there a way via your site to communicate with

    asked by DanH
  41. pigskin geography

    Here is the question, The Wonders of American stamp series informs us the American bullfrog is the largest frog,and perhaps the loudest. Their bodies grow to what size?___inches. Their calls can be heard how far away ____miles. I got the answer to the

    asked by Lanna
  42. HELP!!!!!! ENGLISH

    We thought it was__________ should go. he whom him whom he who him who The supply of tablets (is, are) low. he who... (he should go, not him should go) The supply is low

    asked by Kallie------
  43. spanish

    how do you say pool in spanish? piscina = pool charca is pool If you are talking about "pool" as the game... it is billar If you are talking about swimming pool, it is piscina piscina Thank you for using the Jiskha Homework Help Forum. First of all, it's

    asked by Anonymous
  44. Linear Approximation

    Use linear approximation, i.e. the tangent line, to approximate 1/0.104 as follows: Let f(x)=1/x and find the equation of the tangent line to f(x) at a "nice" point near 0.104 . Then use this to approximate 1/0.104 . L(x)=f(a)+f'(a)(x-a)...i think. You're

    asked by Jojo
  45. Calculus

    How do I graph sin and cosin example: graph y=-4sin(x + 3.14) Your function is the sin function shifted by pi units to the left. You need to study the sin function and know how to graph it. There should be a picture of it in your text, it's a very commonly

    asked by Karen
  46. Calculus

    How do you find Altitude and slope slope is the derivative of a function: for ex. if you have f(x)=x^2 + x, at point (1,2) f'(x)=2x+1 your slope is 2(1) + 1 = 3 =m to find the equation is y-y1=m(x-x1) so you have: y-2=3(x-1) gives you: 3x-1 is your

    asked by Karen
  47. english -I NEED HELP AGAIN

    Almost _________ work would be better than ___________. anyone's hers anyone's her's anyones hers anyones' hers' Anyone is singular and needs to show possession -- so anyone's work. . . The next pronoun is also singular and possessive. But, hers shows

    asked by Kallie------
  48. english -I NEED HELP AGAIN

    Almost _________ work would be better than ___________. anyone's hers anyone's her's anyones hers anyones' hers' When a possessive noun is used, (mother's, sister's, anyone's) use an apostrophe. When a possessive pronoun is used, (hers, his, its) an

    asked by Kallie------
  49. Algebra 2345678!!

    Solve the system of equations using the Addition method. 2a + 3b = -1 3a + 5b = -2 The addition method tells you to find common multiples of a coefficient, then add the equations together to eliminate a variable. If you multiply the first equation by 3 and

    asked by Margie

    Almost_________ work would be better than___________. anyone's hers anyone's her's anyones hers anyones' hers' Please check my previous answer.

    asked by Kallie------
  51. DanH-Algebra 1

    Solve the system of equations using the Addition method. 2a + 3b = -1 3a + 5b = -2 Margie: Roger's answer below is correct. If you don't understand it, please try and tell us what you don't understand. He makes it sound so strange can you ask him to

    asked by Margie
  52. Japanese

    I am studying Japanese and I needed to know how to say these terms: 1.hello 2.bye 3.My name is.. 4.Lier 5.Shut Up!! Sorry it's just that today is my first day in Japanese class. Thank you for using the Jiskha Homework Help Forum. Here are the expressions

    asked by Happy Halloween
  53. English

    Hi, I was wondering if somebody could help me understand this writing prompt. I'm not sure If I'm supposed to talk about the characters' different points of view in some goals toward achieving sucess or if I'm supposed to tell what each characters' goals

    asked by Isabel
  54. Government (Jury)

    I was wondering why we have a jury system for courts? Please respond. =) Thanks.

    asked by Patrick
  55. TLC error correction

    Question: Consider the following errors that could be made when running TLC. Indicate what should be done to correct the error. A. A two-component mixture containing 1-octene and 1,4-dimethylbenzene gave only one spot with an Rf value of 0.95. The solvent

    asked by Sheryl
  56. math - probability

    Albino rats used to study the hormonal regulation of metabolic pathway are injected with a drug that inhibits body synthesis of protein. Usually, 4 out of 20 rats die from the drug before the experiment is over. a) If 10 animals are treated with the drug,

    asked by Lindz
  57. MATH - probability #2

    A rescue squad spokesperson claims that the squad receives an average of 3 calls per hour. If at most 6 calls were received over a 5-hour period, would you suspect that the spokesperson was overestimating the average number of calls received per hour?

    asked by Lindz
  58. Related Rates

    Water is leaking out of an inverted conical tank at a rate of 500 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 10 meters and the diameter at the top is 4.5 meters. If the water

    asked by Tom
  59. Accounting

    What would the journal entry be for this transaction? sent a reminder to Gomez Co to pay the fee for services recorded on November 8 There would be no entry since a transaction did not take place.

    asked by Anonymous
  60. science

    what is the volume of 10 galons???? That's easy. It has a volume of 10 gallons. Do you want it converted to another unit?

    asked by brandy
  61. physics

    what site can i find physics formulas?

    asked by miss sixty
  62. Sentence Grammar

    Whats the error in these two sentences? After seeing the technique demonstrated on television, Janie baked homemakde bread for the first time yesterday, and her brother thought it tasted good, an opinion everyone agreed with. and Three hundred years ago

    asked by Sigor
  63. Difference?

    What is the difference between these two questions? They look the same to me, like they're asking the same thing. Not likely. Question: A student spots an unknown sample on a TLC plate and develops it in dichloromethane solvent. Only one spot, for which

    asked by Sheryl
  64. math

    i need to find facts on the number 4 What kind of facts? The number 4 immediately precedes the number 5 and is the first whole number after 3. Then you can make up a bunch of stuff using 4; i.e, 96 + 4 = 100 etc. If this is not the right direction, please

    asked by aretha