1. Math-Algebra

    I need help factoring these two problems: 1. 8j^3k - 4jk^3 - 7 2. 2ak - 6a + k - 3

    asked by Courtney on September 16, 2007
  2. Math

    Can someone please check these problems? Thank you! Solve each equation for the indicated value. 1. a-b=-c, for a I got a=-c+b 2. 4y+6x=12, for y I got y=-3/2x+3

    asked by Anonymous on October 26, 2014
  3. Africa

    What were the problems of colonization in Sierra Leone?

    asked by AL 92 on May 16, 2010
  4. math

    simplify the following problems. show all work 1) -1[-2(-3)^3]^2 2) -3{3-2{10-3(-2)^2}^2]^2 3) -3[4-7(-3-5)]-(-5)^2

    asked by Janae on September 27, 2011
  5. Algebra

    Hi. I am having some problems with substitution method and i just can't seem to get these right. I have 1. 2x - 3y = -1 with y = x-1 2. -4x + y = 6 with -5x- y = 21 and finally, 3. -5x + y =-3 with 3x -8y = 24

    asked by David on January 8, 2011
  6. science

    What type of environmental problems do they have in Kansas?

    asked by Kelly on February 6, 2009
  7. algebra

    show me how to do this so that i can do my other problems simplify 125-2*5/3^3-3^2-(3^2)

    asked by babygirl on September 28, 2011
  8. math

    i need help with word problems dealing with estimation

    asked by Kennari on October 10, 2007
  9. math

    How do i subtract integers? Having trouble with problems like -14-(-5)-8

    asked by lulu on October 24, 2012
  10. Algebra

    How would I solve -32=8/7(3w-1) I have no clue.. ._. These problems stress me out

    asked by June on October 17, 2010
  11. children's literature

    literature can help learn to clarify problems and:

    asked by tasha on June 8, 2013
  12. Math

    I am having a hard time simplifying problems can anyone help. Example; 8.4x+14-9.2x-8.1

    asked by Stressed on May 25, 2013
  13. art

    what are the major local civic problems?

    asked by kgd Nk on May 29, 2013
  14. Math

    Ms.Sue or Steve, how do I do those factoring problems?

    asked by First Name on May 29, 2018
  15. Alegebra 1

    can someone please help me asap with this two problems I'm really stuck here. 1) solve for j if b=j+v/2 2) 9r+9s+9

    asked by Jessi on September 21, 2009
  16. math

    how to solve negative output problems

    asked by nicholas on September 21, 2009
  17. Algebra

    Please Simplify: Having problems with this, and have many more to do. But if I get some guidence for this one I think I will be ok! (root5)a^7/2)^4 a^3/a^8 Thank you!

    asked by Janice on June 26, 2009
  18. Math

    slope and y intercept form of these two problems? Y-5=1/3(x-9) 2y+6a-4x=0

    asked by Carly on October 11, 2012
  19. MAth

    absolute value problems |30|/|10| + |-2+7|/5 x 8 = 17.4 is this answer correct?

    asked by Amy on August 18, 2014
  20. science

    What are some problems with the lost or lack of biodiversity?

    asked by Larry on October 14, 2007
  21. US HISTORY

    WHAT PROBLEMS DID THE AMERICANS AND THE MEXICANS HAVE WITH EACH OTHER IN TEXAS

    asked by jj on February 21, 2013
  22. :)

    simplify the following problems. show all work 1) -1[-2(-3)^3]^2 2) -3{3-2{10-3(-2)^2}^2]^2 3) -3[4-7(-3-5)]-(-5)^2

    asked by Nae on September 27, 2011
  23. math

    simplify the following problems. show all work 1) -1[-2(-3)^3]^2 2) -3{3-2{10-3(-2)^2}^2]^2 3) -3[4-7(-3-5)]-(-5)^2

    asked by Janae on September 27, 2011
  24. algebra

    help with week 8 word problems in mat116

    asked by cynthia on March 23, 2010
  25. psychology 210

    can someone help me with my assignment psychology and health problems

    asked by lorraine on September 29, 2009
  26. math

    what two simpler problems can you use to find 9 times 38?

    asked by brendan on October 1, 2012
  27. Math

    can someone please tell me how to solve problems like this>>>> 3/4q -7=8 3/4 is a fraction Thanks for helping me

    asked by Madison on October 15, 2007
  28. History

    What about problems in the past dealing with the second amendment?

    asked by Anonymous on October 30, 2011
  29. Algebra

    Hi. I am having some problems with substitution method and i just can't seem to get these right. I have 1. 2x - 3y = -1 with y = x-1 2. -4x + y = 6 with -5x- y = 21 and finally, 3. -5x + y =-3 with 3x -8y = 24

    asked by David on January 8, 2011
  30. Science

    Identifying the cause of any problems in a design is called____.

    asked by Anonymous on October 29, 2016
  31. Health

    What is a physician specializing in urinary problems?

    asked by Lory on September 12, 2007
  32. algebra 2 honors

    how do you solve problems like : log3x-log5=1

    asked by vanessa on February 11, 2009
  33. math

    What type of different distance rate problems are there?

    asked by Ariana on March 20, 2016
  34. Science

    What are some of the problems when designing a new single cell

    asked by Tia on November 30, 2009
  35. Algebra 2

    Find the polynomials roots to each of the following problems: #1) x^2+3x+1 #2) x^2+4x+3=0 #3) -2x^2+4x-5

    asked by Haylee on May 11, 2007
  36. ipc

    how do i solve spefic heat problems?

    asked by haley on November 2, 2009
  37. health

    what are some mental or emotional problems i can research

    asked by help on October 1, 2013
  38. Algebra

    Simply: Please show me how to work the problems. (7/2)^-3

    asked by Sam on May 14, 2008
  39. PSYCHOLOGY

    DISCUSS PROBLEMS ASSOCIATED WITH TEENAG PERIOD.

    asked by MOLYNE on May 15, 2009
  40. Pre-calculus help

    I have two problems I am stuck on, if you could show me how to solve the problems it would be much appreciated. 1) Find sin 2x, cos 2x, and tan 2x from the given information. tan x = − 1/6, cos x > 0 sin 2x = cos 2x = tan 2x = 2) Find sin 2x, cos 2x, and

    asked by Holly on April 10, 2015
  41. Physical Chem

    A student added solid K2O to a 750.0 mL volumetric flask. The solid was dissolved in water and then the flask filled with water to the mark. This formed 750.0 mL of the initial KOH solution. 20.0 mL of the initial solution was transferred to another flask

    asked by Sara on May 27, 2010
  42. Chemistry

    Potentiometric Acid-Base Titration: The tasks to be performed in Experiment #6 include: A. Preparation of a 0.05 M solution of sodium hydroxide (titrant solution). B. Standardization of the titrant solution. C. Calibration of the pH-meter. D. Determination

    asked by Malik on October 3, 2014
  43. Calculus

    I don't know if I did these problems correctly. Can you check them? Use Integration by parts to solve problems. integral x^3(lnx)dx u=lnx dv=x^3dx du=1/x v=x^4/4 Answer:(x^3)(lnx)-(x^4/16) integral xcosxdx x cosx 1 sinx 0 -cosx Answer: xcosx+cosx integral

    asked by Anonymous on November 18, 2007
  44. Algebra 1 (Reiny or Kuai)

    1. Which x-values should I choose to graph these equations (y = x; y = -x + 6) so that they intersect? 2. 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.

    asked by Please, help me! on December 9, 2013
  45. Chemistry

    Mass of evaporating dish = 41.36 g Volume of saturated NaCl solution = 10.0 mL Mass of evaporating dish and NaCl = 44.50 g Mass of sodium hydrogen carbonate = 0.49g What is the morality(M) of the sodium chloride solution if you prepare in 1 liter of

    asked by Jordan on August 30, 2011
  46. chemistry

    If you pass 10.0mL of a 50.0mL solution of [Co(en)2Cl2]Cl that has been reduced with Zn through a cation exchange column, you will obtain a solution that has three H+ ions for every Co3+ ion that was originally present in the sample. These H+ ions are

    asked by xx on October 26, 2014
  47. chemistry

    The molarity of an aqueous solution of barium hydroxide is determined by titration against a 0.335 M nitric acid solution. If 32.8 mL of the base are required to neutralize 21.5 mL of nitric acid, what is the molarity of the barium hydroxide solution?

    asked by Anonymous on April 1, 2014
  48. chemistry

    The densities of three solutions with known concentrations ( 20% , 50%, and 70%), and one unknown solution were determined. If the densities of 20%, 50% and 70% solutions are 0.69 and 0.58 and 0.49 g/mL, respectively, and the denisty of the unknown

    asked by alayna on June 17, 2013
  49. science(chem)

    Potassium Carbonate + Sodium Bicarbonate... toxic or not? Saw a actual bottle of this stuff in the supermarket...label says oddly enough.."for refreshing dry squid"...weird.. technically how can it "refresh" dry stuff? Sodium bicarbonate is one of those

    asked by ~christina~ on August 4, 2007
  50. Chemistry

    What is the vapor pressure of a solution prepares by dissolving 4.25g of K2O in enough water to preapare 1.25L of Solution at 25 degrees (C)? Assume that the density of the solution is 1.00 g/mL and that the vapor pressure of pure water is 23.8 torr at 25

    asked by Kayla on December 6, 2016
  51. Chem

    Plese tell me if these are right. A 15.0-mL sample of NaCl solution has a mass of 15.78g. After the NaCl is evaporated to dryness, the dry salt residue has a mass of 3.26g. Calculate the following concentrations for the NaCl solution. a. %(m/m)= 3.26 x 100

    asked by Jason on November 7, 2010
  52. chemsitry

    1)100ml sample of solution that is 0.2M in both Naf and Hf has 4.0 ml of 1.0M hcl added to it. calculate the ph change of this soultion .ka =7.2*10^-4 2)40 ml of 0.32M benzoic acid if titrated with 60 ml of 0.2 M naoh. clacilate the ph of the resulting

    asked by Anonymous on March 4, 2012
  53. chemistry

    1)100ml sample of solution that is 0.2m in both Naf and Hf has 4.0 ml of 1.0m hcl added to it. calculate the ph change of this soultion .ka =7.2*10^-4 2)40 ml of 0.32m benzoic acid if titrated with 60 ml of 0.2 m naoh. clacilate the ph of the resulting

    asked by Anonymous on March 4, 2012
  54. chemistry

    We're studying acids and bases; the question states that 50mL of 0.1M HNO3 solution is mixed with 25mL of 0.1M NaOH. What is the pH? I thought that I would use the Henderson-Hasselbach equation; but my answer does not match the one give in the solution.

    asked by micole on May 23, 2008
  55. Pre Cal

    Let P be the point on the unit circle U that corresponds to t. Find the coordinates of P and the exact values of the trigonometric functions of t, whenever possible. (If there is no solution, enter NO SOLUTION.) 4ð = ( , ) sin(4ð) = cos(4ð) = tan(4ð) =

    asked by Karmen on February 9, 2010
  56. Chemistry

    1. Chemists define pH as "the negative logarithm of the concentration of protons". In mathematical terms: pH = - log [H+] What is the pH of a solution whose [H+] is 0.0007 M? i got it as 7.0 i know it is wrong 2. What is the [H+] in a solution having a pOH

    asked by Lynn on April 30, 2013
  57. Chemistry Question (currents)

    A 500-mL aqueous solution of NaCl was electrolyzed for 15.0 minutes, producing Cl2 gas at the anode. If the pH of the final solution was 12.15, calculate the average current used. (hint: what products are produced at the cathode?) A. 3.8 A B. 2.2 A C. 0.47

    asked by M on March 29, 2012
  58. Chemistry

    Nitrate salts containing metal ions with the following electron configurations are added to water to make a solution. Predict whether the salt solution will be colored or colorless and explain the reasoning. a. [Kr]4d10 b. [Ar]3d3

    asked by Anonymous on November 19, 2013
  59. The Curriculum

    Which of the following is not part of negotiating a conflict? A. Enforcing your preferred solution B. Explaining the reasons behind a suggested solution C. Accepting reasonable disagreement D. Listening to and acknowledging others' rights, opinions, and

    asked by Daniela on September 13, 2014
  60. chemistry

    Precipitation Reactions is the title of the section the problem is A solution of sodium hydroxide is added to a solution of iron (II) chloride. My Net ionic equation was OH- + Fe+2 -> Fe(OH)2 I want to know if my answer is correct and why OH in Fe(OH)2 is

    asked by Selenee on September 30, 2009
  61. 8th grade

    Dear Sir, I have question related to Acids and Alkalis is that;- You are given a colourless solution.Describe three tests you would carry out to determine the solution is an acid or an alkali without tasting or using indicators. Please reply me quikly

    asked by Fatima on September 26, 2008
  62. chemistry

    The solid oxide of generic metal M is added to 75 mL of water and reacts to produce a basic solution that is 0.20 M in the resulting compound. Neutralization of the solution required titration with 27 mL of 0.56 M HCl. How many valence electrons must M

    asked by ellie on March 2, 2013
  63. Chemistry Question

    A 500-mL aqueous solution of NaCl was electrolyzed for 15.0 minutes, producing Cl2 gas at the anode. If the pH of the final solution was 12.15, calculate the average current used. (hint: what products are produced at the cathode?) A. 3.8 A B. 2.2 A C. 0.47

    asked by M on March 29, 2012
  64. U.S. History

    1. How did the muckrakers help spark the Progressive movement? A: The muckrakers investigated social problems and published their findings. The muckrakers' articles led to a general public debate on social and economic problems and put pressure on

    asked by Victoria on October 20, 2015
  65. U.S. History (Ms. Sue)

    1. How did the muckrakers help spark the Progressive movement? A: The muckrakers investigated social problems and published their findings. The muckrakers' articles led to a general public debate on social and economic problems and put pressure on

    asked by Victoria on October 20, 2015
  66. math

    Decide whether the each equation has one solution, no solutions,or infinitely many solutions. 1. 2(x-3)= 2X A.One solution B.No solutions C.Infinitely many solutions 2. 3(y-3)= 2y-9+y A.One solution B.No solutions C.Infinitely many solutions 3. 10x-2-6x =

    asked by jake on December 17, 2014
  67. physics

    A car drives along a road section free of curves with speed v0 first through the hollow of a valley (radius of curvature r1) and then over a mountain top (radius of curvature r2). Let the driver have mass m. • What changes in his weight does the driver

    asked by Teri on March 25, 2013
  68. Chemistry-please help

    Hi, I have a queestion on Gas Chromatography(GC). The following were injected into the GC systemk: - 1) 1% sample solution in acetone 2) a 500 times dilution of item 1) The retention time of the main peak in the diluted sample solution 2) shifted by ~

    asked by jess on September 18, 2011
  69. Biology

    Using a special balloon that is permeable to water but not sucrose to make an "artificial" cell. The balloon is filled with a solution of 20% sucrose and 80% water and is immersed in a beaker containing a solution of 40% sucrose and 60% water. The solution

    asked by KJack on February 4, 2012
  70. Math algebra

    David Robertson works as a chemical engineer for U.S. peroxide Corporation. David has 2500 gallons of commercial-grade hydrogen peroxide solution that is 60% pure hydrogen peroxide. How much distilled water(which is 0% hydrogen peroxide) will David need to

    asked by Selena on November 9, 2016
  71. Chemistry

    Imagine that you have a stock solution with a concentration of 4.6 M glucose (C1). You want to use the stock solution to prepare a diluted solution of 0.22M glucose (C2). You need a total volume of 10mL of 0.22M glucose (V2). What volume of water you need

    asked by Marco on September 20, 2015
  72. Biology

    Imagine that you have a stock solution with a concentration of 4.6 M glucose (C1). You want to use the stock solution to prepare a diluted solution of 0.22M glucose (C2). You need a total volume of 10mL of 0.22M glucose (V2). What volume of water you need

    asked by Marco on September 20, 2015
  73. Chemistry

    A solution is prepared by dissolving 15.6 g ammonium sulfate in enough water to make 100.0 mL of stock solution. A 10.00 mL sample of this stock is added to 52.00 mL of water. Calculate the concentration of ammonium ions and sulfate ions in the final

    asked by Anonymous on May 4, 2010
  74. Science

    #1. Kilometers per hour describes the speed of an object. ture false **** #2. Which of the following reference points would allow you to observe the speed of a car that you are traveling in? a) an airplane flying across the sky b) a car traveling next to

    asked by Mindy on February 27, 2014
  75. CHEMISTRY TITRATION Q

    The titration of 25.00mL of Ba(OH)2 solution with an aqueous solution of 0.500 M HCl reaches an end point when 30.20 mL of the HCl solution is added. Determine the concentration of M of the Ba(OH)2 solution. Soo 25.00mL=0.025L 30.20mL= 0.0302L moles= MxL

    asked by LISA on December 15, 2010
  76. chemistry

    Which of the following statements about boiling points are true? A. The boiling point of 0.1 m NaF(aq) is lower than the boiling point of 0.1 m methanol(aq). B. The boiling point of a 0.5 m aqueous solution of LiOH is the same as the boiling point of a 0.5

    asked by Anonymous on April 18, 2013
  77. math

    Tell whether the system has one solution, infinitely many solutions, or no solution. 6y=-5x+24 2.5x+3y=12 A. One solution B. Infinitely many solutions C. No solution

    asked by venus on January 3, 2019
  78. Math

    Tell whether the system has one solution infinitely many solutions or no solution. 1.5x+2y=11 3x+6y=22 a. one solution b. infinitely many solutions c. no solution

    asked by Kaai97 on January 8, 2016
  79. Math

    Tell whether the system has one solution infinitely many solutions or no solution. 1.5x+2y=11 3x+6y=22 a. one solution b. infinitely many solutions c. no solution.

    asked by Kaai97 on January 11, 2016
  80. Math

    Tell whether the system has one solution infinitely many solutions or no solution. 6y=-5x+24 2.5x+3y=12 a. one solution b. infinitely many solutions c. no solution

    asked by Kaai97 on January 8, 2016
  81. Math

    Tell whether the system has one solution infinitely many solutions or no solution.. 1.5x+2y=11 3x+6y=22 a. one solution b. infinitely many solutions c. no solution

    asked by Kaai97 on January 11, 2016
  82. Math

    Tell whether the system has one solution infinitely many solutions or no solution. x=-7y+34 x+7y=32 a. one solution b. infinitely many solutions c. no solution

    asked by Kaai97 on January 8, 2016
  83. Math

    Tell whether the system has one solution infinitely many solutions or no solution. 1.5x+2y=11 3x+6y=22 a. one solution b. infinitely many solutions c. no solution

    asked by Kaai97 on January 11, 2016
  84. Algebra 2

    Hello! I was wondering if someone could tell me if the solution to this problem is identity or no solution. The problem is 4n+5=6r+7 and I think the solution is n=3/2r+1/2 is it an identity or no solution? Thank you so very much for your help!

    asked by Cheryl on October 25, 2016
  85. Math

    Tell whether the system has one solution infinitely many solutions or no solution. 6y=-5x+24 2.5x+3y=12 a. one solution b. infinitely many solutions*** c. no solution

    asked by Kaai97 on January 11, 2016
  86. Math

    Tell whether the system has one solution infinitely many solutions or no solution. x=-7y+34 x+7y=32 a. one solution b. infinitely many solutions c. no solution

    asked by Kaai97 on January 11, 2016
  87. Law and Ethics

    Hi, I'm a incoming freshmen to a university. Over the summer I obtained the book that we would be using for a course. I have spent several hundred hours of self research and self teaching reading the whole entire book and solving every single problem in

    asked by George on July 12, 2011
  88. Chemistry: Molarity

    4.82 mL of a 0.262 M NaOH solution reacts completly with 4.79 mL of HCl solution according to the balanced chemical reaction shown below: HCl (aq) + NaOH (aq) -> NaCl*aq) + H2O (I) What is the molarity of the HCl solution? 4.82 x (1L/1000 mL) = .00482L

    asked by Bob on March 1, 2009
  89. math

    The family Mutillidae consists of over 3,000 species of wasps in which females are completely wingless and produce one of the most painful insect stings. Although not fatal to humans, the pain from the sting can last more than thirty minutes leaving its

    asked by Malbari on September 30, 2016
  90. physics

    A stone is thrown vertically upward. On its way up it passes point A with speed, v and point B, 3 m higher than A, with speed 1/2v. Calculate a) the speed v and b) the max height reached by the stone above point B. I can't find the equation You need to

    asked by jenny on September 17, 2006
  91. calculus

    I have to help teach this class tomorrow for my Senior Seminar Math class. The lesson is over Exponential and Logarithmic Functions and L'Hospital's Rule. I have all the problems needed to review this lesson, but i can not solve any of them. My teaching

    asked by Primo on September 22, 2008
  92. Chemistry

    The molar mass of glucose is 180.16g/mol A. How much glucose is needed to make 500 ml of a .44M (.44mol/1L) solution? .44M/L=180.16x.44/100ml=79.27/1000=.07927x500=39.64g/mol/550ml? B What volume of the .44M solution is needed to prepare 1L of a 5% glucose

    asked by Amanda on December 2, 2014
  93. chemistry

    How many grams of O_2(g) are needed to react completely with 3.95 g of H_2(g) according to the following balanced chemical equation: 2H_2(g) + O_2(g)--> 2H_2_O(g) Molarity (M) is the number of moles of a solute per 1 L of solution--> M= (mol solute)/(L

    asked by Kane on October 3, 2017
  94. Chemistry

    50.00 mL samples of 0.200 mol/L potassium phosphate with an excess of 0.120 mol/L lead II nitrate solution. what is the minimum volume of lead II nitrate solution required? What volume of lead II nitrate solution should the instructor tell the students to

    asked by Michelle on April 11, 2012
  95. Chemistry

    A solution is made by mixing 30.0 mL of ethanol, C2H6O, and 70.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C? I got an answer of 15.45 torr and it marked me incorrect and said "Your answer is the the partial

    asked by Lauren on February 18, 2012
  96. Chemistry

    Hg2+ + 2Cl- → HgCl Mercuric nitrate was standardized by titrating a solution containing 147.6 mg of NaCl(FM 58.44), which required 28.06 ml of Hg(No3)2 solution. Part a: Find the molarity of Hg(No3)2. I already calculated the molarity to be 0.04500 M

    asked by Asuna on October 16, 2011
  97. physics

    Your CECS graduation tassel hangs from the rear view mirror of your graduation gift, a 1981 DeLorean DMC-12 with Mr. Fusion garbage fusion generator!!! Your tassel hangs plumb or vertical when driving at a constant speed on a level highway. When

    asked by Jesse on March 1, 2016
  98. Algebra

    How do you know if a value is a solution for an inequality? How is this different from determining if a value is a solution to an equation? If replacing the equal sign of an equation and put an inequality sign in its polace, is there ever a time when the

    asked by Kim on September 18, 2008
  99. chemistry

    Nicotine is not only bad for you (ahem!), but it also acts as a base in aqueous solution: Kb = 7x10-7 at 298K. i) Find G per mol of nicotine acting as a base in aqueous solution at 298K. ii) Find the pH of the solution if the initial [nicotine] = 0.80

    asked by Tillie on February 11, 2009
  100. College Chemistry 100

    The topic is about acids, bases, and salts. The two equations are given: H20 + HCL -> H30 + CL; H20 + HC2H3O2 H30 + C2H3O2 The question is: A solution with a volume of one liter contains 0.45 mole HC2H3O2 and 0.48 mole C2H3O2 ion. (Ka for HC2H302 is 1.82 x

    asked by Marie on November 11, 2010