1. algebra

    can you please show me how to do this? Determine whether the ordered pair is a solution of the inequality. y>x^2- 5x (2,-3)

    asked by Tyriq on August 25, 2010
  2. chemistry

    Foe Fe(OH)2, Ksp=8 x 10^-16. What is the molar concentration of OH- in a saturated Fe(OH)2 solution?

    asked by Michelle on December 18, 2009
  3. chem- easy

    What is the total mass of a solution prepared by dissolving 4.00 of in 1.00 of water?

    asked by - on February 10, 2009
  4. pre cal

    solve the inequality express your solution in interval notation (x - 4)^2/ (x -6) (x + 6) > 0 Help me!

    asked by amy on December 8, 2011
  5. computer science

    . Investigate the values of  and  such that the system of equations x + y + z = 6 x + 2y + 3z = 10 x + 2y + z = , may have (i) Unique solution

    asked by sonia on November 16, 2010
  6. chemistry

    A solution of potassium chloride has a pH of 7.81.What is the [OH-] in mol/L ? Can you please show steps I would appreciate it very much. Thank you

    asked by Amber on May 25, 2008
  7. chemistry

    If 0.60 mg of KCl is present in 3.0 L of aqueous solution, what is the concentration in terms of the following?

    asked by Norma on July 25, 2010
  8. CHEMISTRY

    how would a chemistry student make a 600 mL of 1.5 M solution of NaBr?

    asked by David on May 9, 2013
  9. CHEMISTRY

    how would a chemistry student make a 600 mL of 1.5 M solution of NaBr?

    asked by David on May 9, 2013
  10. College Algebra

    4y-3

    asked by LeAnn/Please help me on November 18, 2009
  11. Gr.12 Chemistry

    What will happen if an iron spoon is used to stir an AgCl solution?

    asked by Sanjay on September 18, 2018
  12. Chemistry

    I am 100 mL of a 0.5 M HCl solution,and i want to dilute it to exactly 0.1 M. How much water should i add?

    asked by Ethio on October 30, 2011
  13. chemistry

    Why do we use a boiling solution when carrying out oxidation- reduction titration?

    asked by sylvia on January 12, 2009
  14. Algebra

    which ordered pair in the form (x, y) is a solution of this equation? (x+6)y=9 Possible Answers: A. (12,2) B. (3,1) C. (2,1) D. (4,1)

    asked by Niki on January 22, 2016
  15. Chemistry

    What will happen if an iron spoon is used to stir an AgCl solution?

    asked by Sanjay on September 18, 2018
  16. chemistry

    How many grams of NaC2H3O2 are needed to prepare 350. mL of a 2.75 M solution? i got 79.0 ??

    asked by Boberto on April 3, 2016
  17. Chemistry

    What is the mass of Na2SO4 is needed to make 1.5 L of 3.0 M solution? Na=23 g.: s = 32 g: O=16g.)

    asked by Lori on March 14, 2016
  18. Chemisty

    Describe how you would prepare 250 ml of a 0.10M NaCl solution?

    asked by Tina on November 17, 2010
  19. org chm

    how many grams of KOH are needed to make 590 ml of a solution with a pH of 11.35?

    asked by carol on November 17, 2010
  20. Chemistry

    Will there be a reaction if a magnesium strip is placed in a solution containing Zn2+ ions?

    asked by Sanjay on September 18, 2018
  21. chemisty

    how we prepare 0.5 mol of solution of hcl in 70ml in water

    asked by asif on November 15, 2015
  22. chemistry

    what mass of water is necessary to prepare 150.0g of 1.30% saline solution

    asked by Anonymous on December 12, 2014
  23. Chemistry

    Help? How many moles of LiF would be required to produce a 2.5 M solution with a volume of 10.5 L?

    asked by Victoria on August 18, 2013
  24. Med lab tech

    how many grams of KCL are required to make 5.0ml of a 35% w/v solution?

    asked by billie on November 27, 2010
  25. Quick calc question

    The particular solution of the differential equation dy/dt=2*y for which y(0) = 60 is y = 60e2t y = 60 e0.5t y = 59 + et

    asked by Babe Mckay on March 12, 2016
  26. Calculus-HELP PLZ !!!!

    Find the complete general solution to the 2nd ODE: 9y'' + 9y' - 4y = 0

    asked by Elyse on July 22, 2013
  27. Algebra 1

    systems of equations with different slopes and different y-intercepts have more than one solution Always sometimes Never I believe it is Never or sometimes I am leaning towards Never

    asked by A User on November 19, 2015
  28. Math

    solve the elimination method 8a+2b=2 -8a+b=13 determined the solution of the system

    asked by Denise on July 24, 2013
  29. chemistry

    How many moles of HNO3 are present in 34.0 mL of a 4.70 M solution of nitric acid?

    asked by fatima on July 25, 2013
  30. Pre- Algebra

    Solve x - 5/9

    asked by Kameesha on November 7, 2011
  31. Organic Chemistry

    What would have happened if we had forgotten to neutralize the aqueous solution before recrystallization?

    asked by Andy on November 3, 2010
  32. Chemistry

    Determine the total grams of Potassium Iodate solution

    asked by Anonymous on October 1, 2015
  33. Further Maths

    Find the values of N for which the solution of the equations 3x+2y=Nx and 15x+4y=Nx is not unique

    asked by Adam on October 10, 2010
  34. college math

    solve: (3/x)/1=(7/x-20) i keep getting different answers for this question. the last answer i got was 20 (which would make it not a solution) but im not sure if that is right

    asked by monty on November 23, 2009
  35. Calculus

    Find the complete solution to the 2nd ODE: 2y''+3y'+y=t^(2)+3sin(t)

    asked by Sara on July 18, 2013
  36. Chemistry

    How many moles of LiF would be required to produce a 12.0 M solution with a volume of 10.5 L?

    asked by Alek on November 10, 2014
  37. chemistry

    An aqueous solution at 25 °C is 10.0% HNO3 by mass and has a density of 1.051 g/mL. What is the pH?

    asked by Anonymous on February 19, 2015
  38. Algebra

    Graph the system below and write its solution. =+3xy−6 =y−−12x1

    asked by Anonymous on October 9, 2014
  39. chemistry

    A saturated solution of PbSO4 has [Pb^2+] = 1.35E-4M. What is the concentration of SO4^2-? thanks

    asked by amy on December 11, 2010
  40. chemistry

    How would you determine the polarity of the cell after each addition of Fe3+ solution

    asked by ronika kumar on September 23, 2015
  41. Chemistry

    what is the concentration of 0.009 M solution of nh3 at 25 degree fahrenheit?

    asked by Jewel on January 31, 2016
  42. Chemistry

    how many moles of Na2C2O4 are there in 25.00 mL of a .7654 M solution of sodium oxalate?

    asked by Kim on March 3, 2009
  43. CHEMISTRY

    What concentration of aqueous CaCl2 solution freezes at -10.2ºC?

    asked by Anonymous on November 23, 2010
  44. Chemistry

    A solution containing 42 of per 100.0 of water is cooled from 60 to 0 . What will happen during cooling?

    asked by Johannie on September 20, 2010
  45. Chemistry

    How to calculate the density and viscosity of a 10 % by wt salicyclic cid solution.

    asked by arp on February 15, 2010
  46. Chemistry

    Calculate the pH of an aqueous solution containing 3.8 10-2 M HCl, 1.0 10-2 M H2SO4, and 3.3 10-2 M HCN.

    asked by Brooke on February 28, 2012
  47. math

    find all solution sets to the equation 2x^3+12x^2+50x=o

    asked by shieda on January 25, 2012
  48. chem

    La(s) ¨ La(OH)3(aq) (basic solution) Complete and balance the following half-reactions

    asked by sarah on April 11, 2013
  49. Science

    In an acidic solution, why is the OH- concentration lower than it is in pure water?

    asked by Sheryl on October 22, 2011
  50. chemistry

    what is the effects of NH3(aq) and HCl(aq) on the CuSO4 or NiCl2 solution

    asked by molly on February 28, 2012
  51. Algebra 2

    x^4 - x

    asked by Arielt -Help now fast due tommorow on July 28, 2010
  52. Chemistry

    Which solution has the higher osmotic pressure, 2 M NaCl or 2 M CaCl2?

    asked by Joe on July 27, 2010
  53. AP CHEMISTRY

    If a solution of HF (Ka = 6.8*10-4) has a pH of 3.42, calculate the total concentration of hydrofluoric acid.

    asked by MARY on February 16, 2012
  54. CHEMISTRY!!!=0

    Determine the pH of each solution: (a) 0.10 M NH4Cl can someone show me how to do this one so i have the idea of how to do the rest. thanks!

    asked by ALISON on March 1, 2012
  55. chemistry

    8.90 g of NH4Cl is added to 19.7 g of water. Calculate the molality of the solution

    asked by Anonymous on November 7, 2013
  56. chemistry

    When a base is added to an acid so that neutralization occurs, we say that the solution is at the:

    asked by Anonymous on December 5, 2011
  57. Chemistry

    5.70 g of NH4Cl is added to 13.3 g of water. Calculate the molality of the solution.

    asked by Heather on February 16, 2012
  58. chemistry

    How does the voltage of a galvanic cell change, when there is a precipitate in the solution?

    asked by LALA on February 20, 2010
  59. math

    the system of linear equations below has a unique solution for all but one value of a: 6 x−12 y=−6 58 x+a y=−58 What is this exceptional value for a?

    asked by Tiff on October 26, 2010
  60. Algebra

    I am helping my granddaughter in algebra and need to know how to get the answer. What is a solution of x² + 6x = –5? x = –6 x = –1 (I say this one) x = 1 * (she thinks it is this one) x = 6

    asked by Anonymous on October 30, 2014
  61. school math 3rd grader

    how to find solution to subtraction problem without doing any calculation. explain?

    asked by tom on November 18, 2015
  62. Mathematics

    Determine the quadratic equation whose solutions are: 3 and -2. Explain your solution

    asked by Jessica on October 21, 2011
  63. algebra

    Simplify the logarithm log2 (64). Select the correct solution.

    asked by Anonymous on April 13, 2013
  64. chemistry

    What is formed when Na2S is added to a beaker containing amonnia solution?

    asked by Mel on December 2, 2008
  65. Chemistry

    HNO3+NaOH --- H2O+NaNO3 What is formed in the solution besides Cu(OH)2?

    asked by Ashley on October 11, 2010
  66. Chemistry

    need help to balance half reaction in basic solution IO3 to I2

    asked by Shana on July 27, 2013
  67. chemistry

    what volume of 16 sulfuric acid must be used to prepare 1.5 L of a 0.10 M H2SO4 solution

    asked by kathy on September 13, 2013
  68. Chemistry

    what is the molarity of 28.9 g of cacl2 dissolved in water to make 0.78 l of solution

    asked by Fred on May 25, 2013
  69. chemistry

    How many grams of AgNo3 are required to make 25 mL of a .80M solution?

    asked by Barbara on December 10, 2010
  70. algebra1B

    The Directions Say "What Is The Solution Of The System Of Linear Equations?" The Question Is: x-y=2 x+y=-3

    asked by Kylie on February 8, 2010
  71. chemictry

    how many gramms are in barium carbonate with 200g and 7.3% of hydrochloric solution

    asked by cynthia on May 16, 2013
  72. Math

    Find the solution to the system of equations by substitution. 2x+5y=8 and 6x+y=10 Would the answer be (1.5,1)?

    asked by Greg on January 29, 2016
  73. physics

    in electrolysis how is conductivity affected by the molecular mass of the solution

    asked by physics123 on February 20, 2012
  74. Calculus

    Find the specific solution of the differential equation dy/dx= 4y/x^2 with condition y(-4) = e.

    asked by John on February 16, 2016
  75. Pre-Calculus

    I don't understand,please be clear! Prove that each equation is an identity. I tried to do the problems, but I am stuck. 1. cos^4 t-sin^4 t=1-2sin^2 t 2. 1/cos s= csc^2 s - csc s cot s 3. (cos x/ sec x -1)- (cos x/ tan^2x)=cot^2 x 4. sin^3 z cos^2 z= sin^3

    asked by Anonymous on October 31, 2013
  76. History

    Check my homework? Choices: A. Barbed-wire fences, B. windwills, C. steel plows, D. McCormick Reaper, E. railroads Question: Life on the prairie was difficult for everyone. But there were ways to succeed. Match the problems homesteaders faced with possible

    asked by Andy on October 10, 2015
  77. History

    Check my homework? Choices: A. Barbed-wire fences, B. windwills, C. steel plows, D. McCormick Reaper, E. railroads Question: Life on the prairie was difficult for everyone. But there were ways to succeed. Match the problems homesteaders faced with possible

    asked by Andy on October 10, 2015
  78. Chemistry

    Urea (NH2)2CO is dissolved in 100.0 g of water. The solution freezes at -0.085 degrees C. how many grams of urea were dissolved to make this solution. delta T = Kf*molality Plug in 0.085 for delta T, I assume you know Kf for water, calculate molality. Then

    asked by Lauren on February 11, 2008
  79. chemistry

    Methanoic acid HCO2H(aq) also known as formic acid, is partly responsible for the characterisitic itchy rash produced by the leaves of the stinging nettle plant. Calculate the pH of 0.150 mol/L methanoic acid. The Ka for methanoic acid is 1.8 x 10^-4. My

    asked by Sarah on April 6, 2008
  80. Chemistry;HELP

    Correct the following samples of gases to standard temperature. (Assume pressure is constant)(STP stands for standard temp and pressure which is 273K and 101.3 kPa, you do not have to think about the pressure for these four but on the last three you will

    asked by Unknown on August 20, 2013
  81. Pre-Cal (Help Plz)

    [Note: I've attempted these problems 4 times and I haven't been able to get any of them correct. I really need help with this, please.] Use the Law of Sines to solve for all possible triangles that satisfy the given conditions. (If an answer does not

    asked by Ashley on June 22, 2016
  82. science

    in this section of the lab report you are given an opportunity to explain any results you received which are different that expected. SOme of the discreptancies are due to carelessnesss, reading instructions incorectly, porrobservation, basically they all

    asked by beccaa on September 15, 2009
  83. chem

    What is the pH of the solution created by combining 2.40 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 HC2H3O2(aq)? I understand how to find the pH for the NaOH + HCl solution. However, I'm not sure how to find it

    asked by Anonymous on May 2, 2011
  84. Physics

    please check these: 1. According to the Scientific Method, why does a physicist make observations and collect data? a. to decide which parts of a problem are important b. to ask a question c. to make an interpretation d. to solve all problems i was

    asked by y912f on January 27, 2009
  85. Social Studies

    Here is the question .. How did the Enlightenment contribute to the Industrial Revolution? A) People used technology to create greater prosperity for all. B) Reasoning was used to solve human problems. C) Electricity used in the production of material

    asked by Brooke on November 14, 2011
  86. Social Studies

    Can you answer these questions: 1. Under the Articles of Confederation, the greatest amount of power was in the hands of the a) Congress b) American People c) National Government d) states 2. The structure of the Congress was created at the Constitutional

    asked by S... on March 13, 2011
  87. Programming

    Hi. I am taking a computer programming class (C++). I need some help on some programs. I tried going to my teacher - he was of no help and there are no tutors. I have a lot of code, but I'm having problems. I looked online for help, but they're using

    asked by Jay on May 21, 2007
  88. statistics

    Okay, I'm having trouble understanding the difference between "and" and "or" in problems. For example: -When drawing a single card, find the probability of getting a 4 OR a diamond. -When drawing a single card, find the probability of getting a jack AND a

    asked by Shelby on June 20, 2011
  89. math please help

    The speed of a moving sidewalk at an airport is 6 ​ft/sec. A person can walk 42 ft forward on the moving sidewalk in the same time it takes to walk 10 ft on a nonmoving sidewalk in the opposite direction. At what rate would a person walk on a

    asked by madison on October 24, 2016
  90. Chemistry

    Deriving Chem Beer's Law's Equation By comparing the absorbance of each trial solution, Aeq, to the absorbance of the standard solution, Astd, [FeNCS2+]eq can be determined. Two Beer’s Law equations can be written, one for the trial (Aeq =

    asked by Raskin on April 19, 2012
  91. Math

    Experience shows that a ski lodge will be full ( 156 guests) if there is a heavy snow fall in December, while only partially full ( 57 guests) with a light snow fall. What is the expected number of guests if the probability for a heavy snow fall is .40? If

    asked by Jackie on January 18, 2010
  92. Physics

    I have some questions regarding motion problems. If I have a ball at initial velocity of 50m/s at 35 degree angle, to find horizontal and vertical components, I do the following: Vertical is 50(sin35)=28.68-rounded to 29 Horizontal = 50 (cos

    asked by Katherine on October 8, 2010
  93. History

    Describe how living conditions in cities changed during the Second Industrial Revolution. Your answer should include • a brief definition of the Second Industrial Revolution • a description of urban life and the problems created by industrialization

    asked by Kara on January 15, 2011
  94. Anthropology

    Which of the following is not an example of the type of work applied anthropologists do? Applied anthropologists : a)help to develop various programs associated with health care b)help to develop businessmen and corporations solve production and supply

    asked by TAYLOR M B on December 15, 2011
  95. American Government

    The House of Representatives shall be composed of Members chosen every second Year by the People of the several States, and the Electors in each State shall have the Qualifications requisite for Electors of the most numerous Branch of the State

    asked by girly girl on March 5, 2018
  96. obstacles

    What obstacles might you encounter on the path to sucess? Some of the obstacles might be -- illness -- yours or a family member's lack of motivation lack of money failing classes necessary to achieve your goal family responsibilities Sometimes life deals

    asked by Tiffany on June 14, 2005
  97. CHEM

    thank you VERY much for your replies, DrBob. Another question, however: How many moles of ions -both cations and anions- are present in solution when 0.75 mol of potassium chloride is dissolved in 0.25L of distilled water? How do I work this answer to be:

    asked by K on December 12, 2006
  98. algebra

    Can someone please help me with these problems? Please and thank you. 1)Solve the equation: (1/x)+[x/(x+2)]=1 2)Simplify the complex fraction: 3-(3/4) ------- (1/2)-(1/4) (1/x)+ [x/(x+2)] = 1 Convert left side to the sum of fractional terms with common

    asked by Lydia on May 13, 2007
  99. chemistry

    When a mixture of two black powders is heated, it gave off a gas which turned lime water milky Give a chemical equation to show the reaction between gas and lime water Red scales residue can be seen on the black residue. Name the red scales The red scale

    asked by saurav on March 17, 2015
  100. muscle physiology

    okay so we did a lab on muscle physiology. acquired one small 2 cm length of psoas muscle . teased the bundle of muscle fibers into individual muscle fibers. aligned 3 individual fibers on each of three different microscope slides and placed 1 fiber on a

    asked by Natash on February 24, 2009