1. Algebra 2

    I need help simplifying the following problems. 1) square root 16x^2y^4 2) 8y^3+27 / 2xy-10y+3x-15

    asked by Tracy on April 20, 2008
  2. life orientation

    in 10-15 lines critically in 5 ways in which environment problems impacts on community

    asked by samke on May 2, 2012
  3. social studies

    Explain the effect of social studies in solving environmental problems.

    asked by hauwa on March 11, 2013
  4. Logic

    Can someone please help me solve these problems? I have to use the 17 rules of inference to prove the arguments valid: 1) 1. T = R 2. (~R > ~T) > (P . ~S) / ~S v T 2) 1. C > F 2. A > B 3. ~F . A 4. ~C > (B > D) / B . D 3) 1. (S v Q) / ~P > ~S 4) 1. D > P

    asked by Brayden on August 16, 2011
  5. math

    use the order of operations and the digit 4 four times to write problems that have the following answers 44 and 12

    asked by molly on September 27, 2011
  6. early childhood

    What problems might non-English speaking preschoolers encounter in their attempts to play with others?

    asked by betsy on April 4, 2013
  7. Algebra2

    Problems 16 & 17: Determine if the given relation is function or not. Give its domain and range. 16. (-1, 2), (1, 3), (-1, 4), (2, 5) 17. (1, 1), (2, 2), (3, 3), (4, 4)

    asked by Unknown on September 17, 2012
  8. economics

    concepts and problems in Macroeconomics Ireland's high unemployment rate

    asked by Pheobe01 on March 14, 2010
  9. Math

    What are the connections to word problems for direct and Inverse Variations and why are they functions?

    asked by Anonymous on May 31, 2008
  10. jms

    When solving problems, which of these is performed before the others? A. Multiplication B. Addition C. Exponents D. Subtraction

    asked by lola on October 5, 2015
  11. Math

    What are the connections to word problems for direct and Inverse Variations and why are they functions?

    asked by Anonymous on May 31, 2008
  12. computers

    Housing is a problem in Nigeria, write an algorithms to solve these problems.

    asked by Nnari Gift on March 28, 2012
  13. 4th grade algebra

    7 - 7 - 7 - 7 = ? 12 - 15 - 10 - 8 = ? 3 - 7 - 4 - 2 = ? 11 - 9 - 6 - 6 = ? 6 - 5 - 4 - 2 = ? 8 - 5 - 5 - 5 = ? 12 - 7 - 5 - 4 = ? 13 - 3 - 6 - 1 = ? 16 - 10 - 2 - 3 = ? 8 - 2 - 2 - 2 = ? I am not understanding how to help figure these problems out? I

    asked by Judy on November 16, 2010
  14. math

    amy sloved 3/5 of her math problems and had 24 left to do. how many problmes did she solve ?

    asked by help on January 28, 2010
  15. Mathematics

    Does anyone know how to type algebra problems in my macbook computer to post to a thread?

    asked by roek on October 2, 2009
  16. Math

    Find y^1 for the relation 2 sin (x^2y)-5x^3=3y^2. Please explain so I can work similar problems.

    asked by Mary on April 2, 2012
  17. english

    how to write solving problems scene of three characters which started with prologue

    asked by adrian on November 5, 2013
  18. Chemistry

    A goal of the acid-base titration in this scenario is to determine the concentration of sodium hydroxide solution. To do this, a 1.3000 g sample of potassium hydrogen phthalate (KHC8H4O4) is massed out. The KHP has one acid proton (H+). The solid is

    asked by Seth on September 26, 2015
  19. math

    A tank contains 50 gallons of a solution composed of 90% water and 10% alcohol. A second solution containing 50% water and 50% alcohol is added to the tank at rate of 4 gallons per minute. As the second solution is being added, the tank is being drained at

    asked by deel on August 10, 2012
  20. Chemistry

    Hey guys! Trying to understand this problem before my Chem exam but I just can't get it down no matter how hard I try. Detailed solutions would be greatly appreciated because I'm so lost on this one. Thanks! What mass of ammonium chloride must be added to

    asked by Joce on March 24, 2016
  21. chem

    A 0.158 g sample of magnesium metal reacts completely with 100.0 mL of 1.0 M hydrochloric acid in a coffee cup calorimeter. The temperature of the solution rose from 25.6°C to 32.8°C. What is ∆Hrxn? Assume the specific heat of the solution is 4.184

    asked by peter on June 25, 2015
  22. CHEMISTRY

    I have these equations in our book , but I've tried a few times to solve it in half reaction method , but I couldn't yet : 1) KMnO4 + KIO3 => MnO2 + KIO4 ( in a basic solution ) 2) MnO4- + Cl- => Mn^+2 + HClO ( in a acidic solution ) I think these are

    asked by MAD on July 9, 2014
  23. Chemistry

    describe the preparation of 12 mL of a 0.050 M solution of each of the halogens, using the reactions in the preceding question. Available to you are solid Ca(OCl)2; 0.20 M solutions of NaCl, NaBr, NaBrO3, and CuSO4; a 0.40 M solution of NaI; a 0.50 M

    asked by Jana on October 25, 2016
  24. Chemistry,please help

    You are working with the following equilibrium system in which one chromium complex is blue and one chromium complex is purple. The system is at equilibrium and is currently blue. Predict how the color will change if aqueous Ag+ ions are added. Ag+ reacts

    asked by HK on November 15, 2010
  25. stats please help test tom

    When a computerized generator is used to generate random digits, the proability that any particular digit in the set {0,1,2, . . .,9} is generated on any individual trial is 1/10-0.1. suppose that we are generating digits one at a time and are interested

    asked by david on January 24, 2007
  26. Is anyone here a chemistry genuis?

    The formate ion, (CHO2-), is related to the acetate ion and forms ionic salts with many metal ions. Assume that 9.7416 g of M(CHO2)2 (where M represents the atomic symbol for a particular metal) are dissolved in water. When a solution of 0.200 M sodium

    asked by timmy on April 9, 2010
  27. college chemistry

    A 1.875 g sample of pyrazine was dissolved in 25.00g of water, producing a solution that freezes at -1.55 C. Assume the solution behaves ideally. Kf(H2O)=1.86 C/molality. What is the experimental molecular weight of pyrazine?

    asked by Anonymous on February 3, 2011
  28. chemistry

    A solution of 114 mL of 0.190 molecules KOH is mixed with a solution of 200 mL of 0.220 molecules NiSO4. a. write a balanced equation for the reaction that occurs. identify all phases in answer

    asked by susie on October 2, 2011
  29. Chemistry

    If a solution containing 33.82 g of mercury(II) acetate is allowed to react completely with a solution containing 9.718 g of sodium sulfate, how many grams of solid precipitate will be formed? How many grams of the reactant in excess will remain after the

    asked by Caitlin on January 17, 2013
  30. Chemistry

    Suppose you tried to carry out a double replacement reaction by mixing equal voulumes of a solution that contains dissolved NAOH and a solution that contains dissolved NACL. WHat would you expect to happen when the two solutions were mixed? Expain?

    asked by James on March 18, 2014
  31. Chemistry

    An aqueous solution with a density of 0.998 g/ml at 20 degrees Celsius is prepared by dissolving 12.8 mL of CH3CH2CH2OH (p=0.803 g/mL) in enough water to make 75.0 mL of solution calculate the percent (w/w), percent (w/v), parts per million, and molality?

    asked by Jessica on October 2, 2011
  32. chem

    A solution prepared by dissolving 20.2 mL of CH3OH in 100mL of water @ 25 celcius. The final volume of the solution is 118 mL. Calculate the % by mass. density CH3OH[0.782g/mL], H20[1g/mL] @ room temp.

    asked by rita on July 22, 2011
  33. Chemistry - help needed

    In titrations involving sodium thiosulphate and potassium iodide, is it necessary to use starch solution to help us see the end point? If the colour change from yellow to colourless is easily visible, is it acceptable not to use the starch solution?

    asked by janice on February 22, 2011
  34. Algebra II

    A student is asked to solve b2 + a2 = c2 for a and gives the following solution. Assume all variables represent positive Real Numbers. b2 + a2 = c2 pb2 + a2 = pc2 b + a = c a = c-b Explain the mistake(s) made by the student and provide the correct

    asked by Kiara on July 9, 2014
  35. chem

    A solution prepared by dissolving 20.2 mL of CH3OH in 100mL of water @ 25 celcius. The final volume of the solution is 118 mL. Calculate the % by mass. density CH3OH[0.782g/mL], H20[1g/mL] @ room temp.

    asked by susan on July 22, 2011
  36. Chemistry

    A volume of 50.0 mL of aqueous potassium hydroxide was titrated against a standard solution of sulfuric acid. What was the molarity of the KOH solution if 19.2 mL of 1.50 M H2SO4 was needed? The equation is 2KOH(aq) +H2SO4(aq)-» K2SO4(aq)+2H2O(l)

    asked by Ellen on October 3, 2010
  37. chem please help!

    If a solution containing 33.82 g of mercury(II) acetate is allowed to react completely with a solution containing 9.718 g of sodium sulfate, how many grams of solid precipitate will be formed? How many grams of the reactant in excess will remain after the

    asked by Caitlin on January 17, 2013
  38. please help!!

    If a solution containing 33.82 g of mercury(II) acetate is allowed to react completely with a solution containing 9.718 g of sodium sulfate, how many grams of solid precipitate will be formed? How many grams of the reactant in excess will remain after the

    asked by Caitlin on January 17, 2013
  39. Trigonometry

    Solve the equation, where 0° ≤ x < 360°. Round approximate solutions to the nearest tenth of a degree. (Enter your answers as a comma-separated list. If there is no solution, enter NO SOLUTION.) 3 sin x − 3 cos x = 1

    asked by Karen on October 22, 2014
  40. chemistry

    A) solve for the number of grams of Ca2+ ion in a solution prepared by adding 1 gram of calcium oxalate powder to 100 mL at pH 9. (B) explain what happens to the dissolved Ca2+ calculated before if you reduce the pH of this solution to 2.

    asked by naresh on February 10, 2014
  41. chemistry

    Suppose 24.9 grams of copper (II) nitrate is dissolved in 200. milliliters of a 0.70 moles/liter aqueous solution of sodium chromate. Calculate the final molarity of nitrate anion in the solution.

    asked by Deborah on January 20, 2012
  42. Chemistry

    Suppose 24.9 grams of copper (II) nitrate is dissolved in 200. milliliters of a 0.70 moles/liter aqueous solution of sodium chromate. Calculate the final molarity of nitrate anion in the solution.

    asked by Deborah on January 20, 2012
  43. chem really need help!

    If a solution containing 33.82 g of mercury(II) acetate is allowed to react completely with a solution containing 9.718 g of sodium sulfate, how many grams of solid precipitate will be formed? How many grams of the reactant in excess will remain after the

    asked by Caitlin on January 17, 2013
  44. Chemistry

    a precipitate is expected when an aqueous solution of potassium iodide is added to an aqueous solution of: sodium sulfate iron(II) chloride calcium perchlorate barium hydroxide lead nitrate

    asked by Lauren on December 12, 2007
  45. chemistry

    what volume in Liters of 0.15M KCl solution is required to completely react with 0.150 liter of a 0.175M Pb(NO3)2 solution according to the following balanced equation? 2KCl(aq)+ Pb(NO3)2(aq)-PbCl2(s)+ 2KNO3(aq)

    asked by mike on October 26, 2010
  46. Chemistry

    A solution of 114 mL of 0.160 molecules KOH is mixed with a solution of 300 mL of 0.250 molecules NiSO4. a. write a balanced equation for the reaction that occurs. identify all phases in answer

    asked by Rheagan on October 3, 2011
  47. Science

    1. A 25.00 sample of 0.723M HClO4 is titrated with a 0.273M KOH solution. The H3O+ concentration after the addition of 10.0mL is___M. 2. Determine the pH of a 0.188M NH3 solution of at 25 degrees C. The Kb of NH3 is 1.76x10-5.

    asked by Shayla on March 20, 2012
  48. Chemistry

    you measure 5.3g of KOH and dissolve it in enough water to make 400 ml of solution. what is the molarity of this base? You want to neutralize this base with a 3.7M H2SO4. How much sulfuric acid is necessary to do this? x=5.3g/39+16+1 = 5.3/56=.095m

    asked by Jessica on April 5, 2011
  49. Chemistry

    What are the concentrations of the following solutions: a) a 200mL aqueous solution containing 4.26g sodium solfate. b) a 2.00 L aqueous solution containing 107.0g ammonium chloride NH4Cl. Plz can give me someone the answers for BOTH and the steps how you

    asked by Tarkan on December 5, 2010
  50. chemistry

    Calculate how many mL of the 5% w/v AgNO3* solution must be added to 0.4020g of the sample to precipitate all the chloride. Assume the sample is NaCl. * this means tat there are 5 grams of silver nitrate present per 100ml of solution.

    asked by Melanie on April 3, 2011
  51. basic chem

    If a solution containing 33.82 g of mercury(II) acetate is allowed to react completely with a solution containing 9.718 g of sodium sulfate, how many grams of solid precipitate will be formed? How many grams of the reactant in excess will remain after the

    asked by Caitlin on January 17, 2013
  52. Chemistry

    The antifreeze in a car is a 50% by weight solution of ethylene glycol, C2H6O2 in a water solvent. Calculate the boiling point and freezing point of this solution. (For H2O, Kb=0.52 C/m Kf= 1.86 C/m I can't even find the formula for this in my book, please

    asked by Christine on January 24, 2013
  53. OChem

    1. Why does not fluorene dissolve in 1.5M sodium hydroxide solution? 2. What experimental difficulty would you encounter if you had neclected to include a drying step before evaporating the ether solution of the neutral organic compound (fluorene)?

    asked by James on November 4, 2008
  54. chemistry

    Calculate the concentration of the chromate ion that should be present at the final point of the titration of 50, 00mL of a solution of KBr 0, 02mol/L with a solution of AgNO3 0, 01mol/L, if the maximum theoretical error for titration is 1.0%.

    asked by Shania on August 9, 2017
  55. Molarity/molality

    A 3.29 m solution of the solute H2O dissolved in the solvent acetone is available. Calculate the mass ( kg ) of the solution that must be taken to obtain 26.70 mol of H2O. m= molality I have no idea how to approach this problem, I'm not interesting in

    asked by ChEm on May 7, 2010
  56. chemistry

    Calculate the pH of .100 of a buffer solution that is .25 M in HF and .50 M in NaF. What is the change in pH on addition of the following? A. .002 mol of HNO3 B. >004 mol of KOH I calculated the correct pH of the solution but am having trouble calculating

    asked by Ivy on February 1, 2014
  57. Chemistry

    A 5.00-g sample of KBr at 25.0 C dissolves in 25.0 mL of water also at 25.0 C. The final equilibrium temperature of the resulting solution is 18.1 C. What is the enthalpy of solution, delta H (s), of KBr expressed in kilojoules per mole? Last one on prelab

    asked by Dalal on April 10, 2018
  58. english(business writing)

    Identify a problem at work or organization to which you belong. Conduct research that would help your workplace or organization solve this problem, or attend some relevant training or workshop that would provide you with such information. Can you give me

    asked by Sardar on July 27, 2007
  59. English

    Choose one significant, current issue, and specifically connect that issue to Oedipus the King. You will need to consider the following: 1)Take the political structure that we observe in Oedipus The King. Discuss how the socio-political heirarchy observed

    asked by NEED A TOPIC on January 17, 2010
  60. chemistry

    A 1.0 M acetic acid solution (CH3COOH, pKa = 4.7) is neutralized by dissolving NaOH(s) (a strong base) in the solution. Estimate the pH at the equivalence point of the neutralization process: 4.7 7.0 9.3 Which one of the following statements best explains

    asked by bekah on March 31, 2014
  61. check one question statistic

    For the scenario below, determine if the experiment describes a geometric distribution. If it is not a geometric setting, state why. if it is a geometric a) the two outcomes head or not head b) What constitutes one trial Flip a coin constitutes a flip coin

    asked by helen on March 31, 2014
  62. Algebra 1 (Reiny or Kuai)

    1. The school band sells carnations on Valentine's Day for $2 each. They buy the carnations from a florist for $0.50 each, plus a $16 delivery charge. a. Write a system of equations to describe the situation. A: y = 2x; y = 0.50x + 16. b. Graph the system.

    asked by Please, help me! on December 9, 2013
  63. math

    (a) Find the general solution of the differential equation d y/d x =10x+5 (b) Find the solution satisfying y(1)=13

    asked by Carl on September 7, 2018
  64. math

    25.0 mL of an unknown HCl solution is titrated with 17.5 mL 0.100 M NaOH. What is the Molarity of the HCl solution?

    asked by ghada on November 9, 2015
  65. math

    the lab keeps two acid solutions on hand. one is 20% and the other is 35%. how much 20% and how much 35% acid solution should be used to prepare 25 liters of a 26% solution?

    asked by skye on July 12, 2012
  66. math

    chemist has 6liter of 50% acid solution .how much water added to obtain 20% acid solution?

    asked by Anisha on May 1, 2010
  67. pharmacy tech

    Determine the milliliters of water needed to prepare 2 oz of a 10% solution from a 12.5% solution and distilled water.

    asked by rob on April 4, 2011
  68. chemistry

    Calculate the volume of a 9.00 M HNO3 stock solution that must be used to prepare 450 mL 0f a 1.80 M HNO3 solution.

    asked by katie on May 7, 2008
  69. chemistry

    a 36.o% Aqueous solution of sucrose has a density of 1.16g/mL.What mass of sucrose is in 500mL of this solution?

    asked by katie on May 7, 2008
  70. chemistry

    to what volume should you dilute 0.100 L of a 15M NaOH solution to obtain a 1.0 M NaOH solution?

    asked by eugene on March 26, 2011
  71. arif

    when I tried to find solution of 1/(x-3) + 1/(x-9) = 1/(x-2) + 1/ (x-8) all terms of x are cancelled out why? Is there any rule to find solution of this?plz guide me.

    asked by aliya on December 2, 2010
  72. algebra

    solve the equation(enter solution from smallest to largest. if there no solution enter none) 4x^2=15x+4

    asked by missfubu-c on October 28, 2012
  73. chemistry

    determine the molarity of a 18 ml sample of HCl solution that is required to prepare 30 ml of 2.3 M HCl solution?

    asked by linda on February 11, 2011
  74. Chemistry (evaporation)

    A 0.2 M KOH solution has a volume of 3 L. What percent of water should be evaporated to obtain a 0.6 M KOH solution?

    asked by Summer on March 23, 2018
  75. Chemistry

    An aqueous solution is 0.257 m NaOH. What are the boiling point and freezing point of this solution?

    asked by MJ on March 29, 2012
  76. Chemistry

    Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) If 2.00 g of Mg reacts completely with 50.0 mL of HCl solution, what is the molarity of the HCl solution?

    asked by Jayne on July 9, 2011
  77. chemistry

    What is the concentration of this solution? If you added 10mL of water to the 10mL of 0.010M CaCl2 solution.

    asked by fredy on September 13, 2010
  78. science

    25.0 mL of an unknown HCl solution is titrated with 17.5 mL 0.100 M NaOH. What is the Molarity of the HCl solution?

    asked by ghada on November 9, 2015
  79. Chemistry

    Describe in words how you would make a 1.00 M solution of HCl from a 5.00 M solution of HCl. Completely stumped here. Any help?

    asked by Brianna on September 26, 2015
  80. science

    What volume of .01M KOH solution is needed to react with 20ml .01M Zn(OH)2 solution

    asked by Anthony on May 19, 2011
  81. chemistry

    to what volume should you dilute 0.100L of a 15M NaOH solution to obtain a 1.0M NaOH solution

    asked by veronica on July 10, 2013
  82. chemistry lab

    what is the number of moles of a 0.05 M KMnO4 solution that react with 20 ml of a 0.02 M solution of FeCl2 if 75 ml of KMnO4 was required

    asked by shawnette on March 22, 2018
  83. Chemistry

    What is Mass % of an aqueous NaOH solution in which molality of NaOH is 16.7m? Density of the solution is 1.4339g/ml

    asked by Janet on January 13, 2013
  84. Chemistry

    1.000 grams of KHP consumed 43.3 mL of KOH solution. What is the molarity of the KOH solution?

    asked by Anonymous on November 9, 2016
  85. Math

    Please check my answers 1. Which ordered pair is a solution of y=x-4? My answer is B (0, -3) 4.Which equation has (2,-1) as a solution My answer is D y=-2x+1

    asked by COW on February 12, 2018
  86. Math

    A 7(1/2)% strength solution has been prepared. a) How many grams of medication are in the 7(1/2)% strength solution how do I setup this question?

    asked by Matty on February 24, 2016
  87. Chemistry

    A solution contains 153g Na3PO4 and 415g H2O. What is the percentage concentration of Na3PO4 in this solution

    asked by wj on July 13, 2011
  88. pharmacy tech

    Determine the milliliters of water needed to prepare 2 oz of a 10% solution from a 12.5% solution and distilled water.

    asked by rob on April 4, 2011
  89. math help :)

    the lab keeps two acid solutions on hand. one is 20% and the other is 35%. how much 20% and how much 35% acid solution should be used to prepare 25 liters of a 26% solution?

    asked by carry on on November 6, 2017
  90. algebra 1

    y=2x-1 2x-y-1=0 a)this sytem has excatly onw solution b)this system has indinetly many solutions c)this system has no solution d)(1,1) and (0,0)

    asked by jenika on May 17, 2012
  91. Math! URGENT

    Describe the number of solutions for the equation. -2(x-1)=2x-2 A. Infinite solutions B. One solution C. No solution Is the answer B?

    asked by Gwen on September 25, 2014
  92. chemistry

    What volume for 1.5M KCl solution must be used to prepare 500. mL of a .550 M KCl solution? I need the set up

    asked by Sarah on September 22, 2010
  93. chemistry

    . What would be the molarity of the solution produced when 276 mL of 6.00 M NaOH is combined with 125 mL of a 2.00 M NaOH solution?

    asked by jey on February 20, 2017
  94. Chemistry

    suppose you added 26.0 ml of 0.01 M NaOH to the solution, what is the molarity of excess NaOH in the mixture? what is the ph of this solution?

    asked by Mollie on November 19, 2014
  95. Algebra

    Is(0,3) a solution to the equation y=x+3 A. Yes B. No*** Is (1,4) a solution to the equation y= -2x A. Yes*** B. No Look at the following points (4,0) (3,1) (6,3) (2,-4) Which are the solutions to y= x-4? Choose all the correct answers A.(6,3) B.(4,0)***

    asked by Abby on September 22, 2015
  96. Algebra

    Find the y- and x-intercepts for the equation. Then graph the equation. Does y come first in the solution? I figured that: the first solution is (0,-3) is this correct? and is x = to {3/7,0}? Thanks! f(x) = - 3 - 7x

    asked by Rachale on March 2, 2009
  97. Math! URGENT

    Describe the number of solutions for the equation. 5(x-9)=5x A. No solution B. One solution C. Infinite solutions Is the answer B? Thank You for any help.

    asked by Gwen on September 25, 2014
  98. math

    Solve the system by elimination. State whether the system has one solution, infinite solutions, or no solution. x + 3y = –5 4x – y = 6 please help thanks

    asked by jade on December 19, 2017
  99. chemistry

    What is the pH of a solution prepared by dissolving 6.0 g of HCl in water to make 415 mL of HCl solution?

    asked by Chuck on March 29, 2011
  100. Chemistry

    The density of a solution of 3.69g KBr in 21.70g H2O is 1.11g/mL. What is the %w/v of KBr in the solution?

    asked by Jude on October 10, 2010