# Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 2x + 10y = 58 -14x + 8y = 140

91,718 questions, page 149
1. ## math

I need step by step explanation of the following problem. Using the lever system equation F1x=F2(d-x)solve the following problem: A screwdriver 9 in. long is used as a lever to open a can of paint. The tip of the screwdriver is placed under the lip of the

asked by Traci on February 24, 2013
2. ## AlphaPlus

A student is asked to dilute a 4.85 mol/L stock solution in order to obtain 7.00 L of 1.25 mol/L solution. WHat volume of the stock solution should the student start with?

asked by JavaCompiler on May 7, 2016
3. ## Chemistry

A solution is 40% acetic acid by mass. The density of this solution is 1.049 g/mL. Calcu- late the mass of pure acetic acid in 120 mL of this solution at 20 C.

asked by Eric on October 10, 2010
4. ## chemistry 121

If a solution of 0.5 M HOAc dissociates as follows: HOAc + H2O „® H3O+ + OAc-, what is the final [H3O+] in the solution? Ka for HOAc = 1.8„ª10-5. What is the pH of the above solution? What is the Kb for HOAc? not sure of the initial set up please

asked by Nicole on May 5, 2015
5. ## Precalculus

Which of the following is a solution for the equation 1/485tan^2x = 0? a) pi b) pi/2 c) 485pi d) no solution Which of the following is NOT a solution to the equation 4sin^2x = 1 for 0≤x≤2pi? a) 30 degrees b) 210 degrees c) 150 degrees d) 120 degrees?

asked by Melissa on January 27, 2012
6. ## To Dr.Bob

The problem you helped me with: A liter of a solution saturated at 25 deg C with calcium oxalate, CaC2O4 is evaporated to dryness, giving a .0061 gm residue of CaC2)4. Calculate the concentrations of the inons, and the molar solubility and the solubility

asked by Anonymous on June 11, 2006
7. ## Albebra

Find the vertex of the function y = –x2 + 2x + 8. It is where the derivative -2x + 2 = 0. Since you probably haven't learned about derivatives, do it this way: Rewrite is as -x^2 +2x +8 = -(x-1)^2 + 7 Now look at the form of the formula on the right. It

asked by Joel on March 20, 2007
8. ## Algebra

I was given an answer to a question but what I really need are the steps to get there as I have other questions I need to answer the same way. Solve the equation w=Cr^-2 for r I was given r=C/w This equation is meant to figure out the weight of an object

asked by Marysvoice on February 1, 2008
9. ## Math

Huong covered a box with sticky-backed decorating paper. The paper costs \$.03 per square inch. How much money will Huong need to spend on paper if the height of the box is 9 inches, width is 3 inches, and the length is 7 inches? Please show full work.

asked by Monica on October 9, 2013
10. ## math

Essay question: show all work. Suzie’s flower shop estimates that supplies costs for one month will be given by the polynomial 5x2 + x – 4. She estimates that utilities costs for one month is given by 8x – 7. Find and simplify an expression that

asked by Anonymous on May 22, 2011
11. ## math

If length of one side of a 3x3 square is four times, and the length of the adjacent side is tripled, the perimeter of the new rectangle is how many times bigger than the perimeter of the original square? please explain and show work.

asked by Johnny on July 16, 2014
12. ## algebra-is this right

A basketball player has a vertical leap of about 36 in. If the equation d=48t^2 describes his hang time t as a function of his vertical leap d. what is his hang time? Show your work. 36=48t^2 t^2=3/4 t=(1/2)sqrt(3)seconds

asked by dan on April 25, 2010
13. ## ACCOUTING

If beginning inventory consisted of 22,500 units, ending inventory was 7,500 units, and 33,000 units were started during the period, how many units were completed and transferred out of the department to the next department? Show your work

asked by KIKI on May 20, 2015
14. ## algebra, math

A piece of wood that is 9 feet long is cut in half legthwise. Each half is then cut legthwise into six congruent pieces. What is the length of each of the twelve small pieces of wood? Show your work.

asked by syram on March 21, 2013
15. ## English

1. What do you need to put on a shadow puppet show? 2. What do you need to perform a shadow puppet show? 3. What do you need to act on a shadow puppet show? (Which one is similar to #1, #2 or #3?)

asked by rfvv on March 18, 2010
16. ## Algebra

That is not what the ? is asking. The ? is asking about how to get the quotient function, not the composite as you solved for. Can you please show us how to get the quotient function solution? Thanks! I need to find the Quotient Function of the following:

asked by Rachale on June 14, 2009
17. ## Chem Problem

Help Please? In the preparation of a mustard solution, an individual package of mustard was emptied into a beaker and the mass was determined to be 3.809 grams. The mustard was then dissolved in 50.0 ml. of distilled water. The total mass of the solution

asked by Kelli on October 9, 2012
18. ## Chemistry

Posted by Hannah on Saturday, April 18, 2009 at 3:05pm. Find the pH of a 0.010M solution of NH4ClO4 and the pH of a 0.010M solution of NH4C2H3O2. Responses * chemistry - Anonymous, Saturday, April 18, 2009 at 3:36pm after finding the ph of the

asked by Anonymous on April 18, 2009
19. ## CHEMISTRY

A concentration cell is constructed of two hydrogen electrodes. The pressure of H2 is 1.00 atm in each hydrogen electrode. One of the electrodes is immersed in a solution with [H+] = 1.0 M and the other in a solution with 0.62 M NH3. What will be the value

20. ## Improving writing

Background Ten years ago, you started working as a clerk for DMD Medical Supplies. Six months ago, Liz Jakowski, the human resources director, promoted you to office manager. You manage two employees: Jack Snyder and Ruth Disselkoen. Your office provides

asked by Camilla on December 3, 2014
21. ## Chemistry, Math

A chemist dissolves 0.091 g of CuSO4 · 5 H2O in water and dilutes the solution to the mark in a 500-mL volumetric flask. A 31.8-mL sample of this solution is then transferred to a second 500-mL volumetric flask and diluted. What is the molarity of CuSO4

asked by Ethan Boersig on February 21, 2019
22. ## chemistry

You extract the iron from a tablet and dilute that to 600.0 ml in a volumetric flask. You transfer 0.600 ml of this solution to a 75.0 ml volumetric flask and dilute this to volume. When you measure the concentration of this solution, you find that it is

asked by leigh on March 28, 2012
23. ## Chemistry

A chemist dissolves 0.095 g of CuSO4 · 5H2O in water and dilutes the solution to the mark in a 500-mL volumetric flask. A 39.7-mL sample of this solution is then transferred to a second 500-mL volumetric flask and diluted. What is the molarity of CuSO4 in

asked by Neftali on March 23, 2013
24. ## Chemistry

Hydrogen peroxide solution, H2O2(aq), is available with a concentration of 1.667mol/L. When diluted to a concentration of 0.25mol/L, the solution is used as a disinfectant. What volume of water should be added to 100 mL of the concentrated hydrogen

asked by Lori on February 21, 2013
25. ## POLYNOMIALS

ok, this might be a bit torturous, but if anyone is patient enough and help me with my working, i'd REALLY APPRECIATE IT!!!! Question: The cubic polynomial f(x) is such that the coefficient of x^3 is 1 and the roots of f(x)=0 are 1, k, and k^2. IT is given

asked by Aoi on June 15, 2009
26. ## communication

In a bad news message to subordinates, why is it a good idea to ask readers to suggest solutions to the problem? So you will have someone to share the blame with if you are unable to solve the problem So your subordinates will not blame you for the problem

asked by helen on June 2, 2010
27. ## Programming Concepts

Can someone please explain to me how I can get the solution for this question. Use the top-down modular approach and pseudocode to design a suitable program to help you solve this problem. Whenever appropriate,validate the input data. Find the sum of the

asked by terri on May 13, 2014
28. ## Chemistry

If you could me solve ths is anyway, it would be much appreciated. A solution containing 3.50g of sodium carbonate is mixed with one that contains 5.00g of silver nitrate. a. Write the complete chemical equation and the net ionic equation for the reaction

asked by Molly on June 29, 2013
29. ## Chemistry

If you could me solve ths is anyway, it would be much appreciated. A solution containing 3.50g of sodium carbonate is mixed with one that contains 5.00g of silver nitrate. a. Write the complete chemical equation and the net ionic equation for the reaction

asked by Molly on June 29, 2013
30. ## Chemistry

what would be the molarity of a KOH solution if 15 mL of the solution required 22.3 mL of 0.085 M HCl to react with the base?

asked by Anonymous on March 15, 2011
31. ## Chemistry

Please help me understand!..If you have 100.0mL of a 30.0% aqueous solution of ethanol, what volume of water is in the solution?

asked by Emily on March 8, 2011
32. ## analytical chemistry

a 0.120 ml portion of a 50.0% (w/w) KOH solution having a density of 1.50*10^3 g/l is diluted to 250 ml. What is the pH of the resulting solution?

asked by lolo on March 30, 2013
33. ## Chemistry

What volume of a 0.125 M solution of NaOH is needed to neutralize 25.0 mL of a 0.285 M solution of HCL

asked by Beth on April 23, 2018
34. ## Chemisry

If 125 mL of a 6.00 M KNO3 solution is diluted with 100.0 mL of water, the molarity of the resulting solution would be

asked by Anonymous on October 16, 2013
35. ## AP Chemistry- Acids

What is the pH of a solution obtained by adding 145mL of 0.575M HCl to 493mL of a HNO3 solution with a pH of 1.39?

asked by franny on February 12, 2014
36. ## chemistry

A beaker contains 50.0 mL pf 0.953 M solution of a diprotic acid. How many grams of Mg(OH)2 are required to neutralize this solution?

asked by Monica on June 12, 2010
37. ## calculate ratios

Calculate the amount of drug in a ratio solution. How many micrograms are in 1ml of a 1:5000 solution?

asked by Vicki on March 6, 2012
38. ## chemistry

Calculate the molarity of a solution prepared by diluting 200.0 mL of 4.0 M HCl to 500.0 mL of solution a. 1.1 M b. 1.6 M c. 2.7 M d. 10. M

asked by anonymous on December 11, 2011
39. ## Chem112

Compute pH of the saturated solution of La(OH)3 in ther 3x10^-5 M aqueous solution of La(NO3)3xKsp(La(OH)3).

asked by Dominique on October 3, 2011
40. ## Chemistry

How many millimeters of this solution should be diluted with water to produce 650 mL of a solution with pH= 11.50? 6.8% ammonia (d= 0.97g/ml)

asked by Raj on February 14, 2009
41. ## chemistry

how many millimeters of a 2.0M NaOH solution are needed to neutralize 20.0ml of a 2.5M CH3COOH solution? How do I figure this out?

asked by Anonymous on October 9, 2011
42. ## Chemistry

Determine the pH of a solution made by diluting 25mL of 6.0 M HCl until the final volume of the solution is 1.75 L

asked by Dylan on April 21, 2016
43. ## Chemistry

What is the concentration of a solution if I dissolve 42g of NaOH in a total volume of 375ml of solution

asked by Anonymous on May 9, 2012
44. ## chemistry

A 0.20 M sodium chlorobenzoate (NaC7H4ClO2) solution has a pH of 8.65. Calculate the pH of a 0.19 M chlorobenzoic acid (HC7H4ClO2) solution.

asked by justin on November 28, 2010
45. ## Chemistry

What is the molarity of an aqueous solution that is 6.44% glucose (C6H12O6) by mass? (Assume a density of 1.03 g/mL for the solution.)

asked by Shelby on March 16, 2014
46. ## Cheimistry

how much water must be added to a 30ml of 0.5M KOH solution to produce a solution whose concentration is 0.45M?

asked by Ibraheem on February 14, 2017
47. ## chemistry

I also have a question on making oxalic acid solution. What is the appearance of the solution should be? including transparency?

asked by blast on July 1, 2011
48. ## Chemistry

When Zn(OH)2(s) was added to 1.00 L of a basic solution, 1.24×10−2 mol of the solid dissolved. What is the concentration of OH− in the final solution?

asked by Amber on October 29, 2015
49. ## Chemistry

if 5.00 ml of 1.66x10^-1 M HCl solution is diluted to exactly 250.0 ml with water, what is the concentration of the resulting solution?

asked by Alex on November 16, 2014
50. ## Chemistry-Help!!

If I have 10mL of 1.0 M Ba(OH)2 solution and add it to 2.5L of water. What is the concentration of hydroxide ions in the diluted Ba(OH)2 solution?

51. ## chemistry

Calculate the molarity of a solution containing 40.0 g glucose (C6H12O6) in enough ethanol (C2H5OH) to make 40.0 mL of solution.

asked by CC on February 10, 2010
52. ## Chemistry

If you dilute 19.0 mL of the stock solution to a final volume of 0.350 L , what will be the concentration of the diluted solution?

asked by Victoria on November 14, 2017
53. ## Chemistry

You know the solution forms a precipitate when? (A) when it changes color (B) when you can’t see through it (C) because it bubbles (D) you have stirred it for more than 5 minutes (E) the solution thickens

asked by Ivy on December 7, 2010
54. ## Chemistry

What is the mass, in grams, of NaCl formed from the reaction of 2.75 mL of a 6.00 M Na2SO4 solution and 8.30 mL of 2.5 M solution of HCl?

asked by Jane on November 23, 2011
55. ## mcckc.edu

A 0.10MNaCl solution is blank (iso/hypo/hypertonic) to a 0.10M glucose solution

asked by paulina on January 29, 2011
56. ## chemistry

What is the pH of a solution if 100.0 mL of the solution is 0.23 M with respect to acetic acid and contains 1.71 g of sodium acetate, NaCH3CO2?

asked by Sam on March 18, 2012
57. ## chemistry

If you were given an unknown solution, write the steps that would be needed to prove that a solution contained phosphate.

asked by AJ on January 5, 2011
58. ## Chemistry-Confused!!

You have 10mL of a 1.0 M Ba(OH)2 solution and add it to 2.5L of water. What is the concentration of hydroxide ions in the diluted Ba(OH)2 solution?

59. ## chemistry

In what proportion should you combine a 2:5 soaking solution and distilled water to create a 300 ml of a 1:20 solution?

asked by Kill on July 21, 2014
60. ## Chemistry

Calculate the molarity of 1 lit solution of 93% H2SO4 by weight by volume even the density of solution is 1.84 g/ml

asked by Aman on August 10, 2013
61. ## Chemistry 3A

compute the molarity of a solution consisting of 2.0 moles of calcium chloride in 500mL of solution.

asked by Gurjot on December 10, 2012
62. ## chemistry

In what proportion should you combine a 2:5 soaking solution and distilled water to create a 300 ml of a 1:20 solution?

asked by cham on July 21, 2014
63. ## Chemistry

The density of a 22.0% by mass ethylene glycol (C2 H6 O2) solution in water is 1.03 .Find the molarity of the solution.

64. ## chemistry

In what proportion should you combine a 2:5 soaking solution and distilled water to create a 300 ml of a 1:20 solution

asked by Kill on July 21, 2014
65. ## Chemistry

To what volume should you dilute 25mL of a 12.0M H2SO4 solution to obtain a 0.170M H2S04 solution?

asked by Candice on September 29, 2010
66. ## Chemistry

A beaker contains 50.0 mL of 0.952 M solution of a diprotic acid. How many grams of Mg(OH)2 are required to neutralize this solution?

asked by Monica on June 12, 2010
67. ## Chemistry ASAP

If 3.2 moles of NaCl are dissolved in enough water to make a 0.98-liter solution, what is the molarity of the solution?

asked by Josh on March 10, 2014
68. ## chemistry

If 40 mL of a 6 {\rm M} \;{\rm NaOH} solution is diluted to a final volume of 200 mL, what is the resulting concentration of the solution?

asked by warla on December 6, 2010
69. ## chemistry

a solution is prepared by dissolving 02.50 mole of Ba(OH)2 in enough water to get 4.00 L of solution. What are the OH- and H3O+ molar concentrations?

asked by tara on July 28, 2011
70. ## chemistry

What is the pH of the solution in which 241 mL of HCl gas measured at 28.0°C and 1.02 atm is dissolved in 1.5 L of aqueous solution

asked by Anonymous on March 1, 2013
71. ## Chemistry

1.69 L of an aqueous solution containing 25.00 g of KCl dissolved in pure water is prepared. What is the molarity of the solution?

asked by Lori on April 22, 2011
72. ## Chemistry

What volume in milliters of calcium chloride stock solution would you use to make .50 L of 3.00 M of CaCl solution?

asked by Sue on March 1, 2013
73. ## Math

determine weather 10 is the solution of the equation x+10=36 is 10 the solution no use multiplcation principle 10x=-90 -9 3[7-9{6-2)]= -87 find -x when x=-62/83*= 62/83

74. ## Chemistry

What would the freezing point be for a solution of 0.87 M aqueous ammonia? the density of this solution is 0.922 g/cm3.

asked by Anonymous on May 1, 2010
75. ## Chemistry

3.13g if CuNO3 is dissolved in water to make a 0.270 M solution. What is the volume of the solution?

asked by Jason on November 22, 2010
76. ## science

Determine the amount of NaoH dissolved in 250ml of the solution by titrating it against N/10 H2so4 solution

asked by Rahul Kumar on April 10, 2017
77. ## chemistry

A 0.100 m K2SO4 solution has a freezing point of -0.43°C. What is the van't Hoff factor for this solution? Kf = 1.86°C/m

asked by Anonymous on February 5, 2012
78. ## Math

determine weather 10 is the solution of the equation x+10=36 is 10 the solution no use multiplcation principle 10x=-90 -9 3[7-9{6-2)]= -87 find -x when x=-62/83*= 62/83

79. ## chemistry

the density of 2 molal aqueous solution of NaOH is 1.10g/L. Calculate the molarity of the solution.

asked by abhi on May 21, 2012
80. ## chemistry

To what volume must 481 mL of 12 M Ca(OH)2 solution be diluted to make a 2 M Ca(OH)2 solution? a)1.352L b)2.886L c)2.10833L d)none of the above

asked by Allison on April 4, 2012
81. ## chemistry

Which is the mass of the solute in 400 grams of 20% solution. What is the concentration of this solution knowing that its density is 1.2 g/mL

asked by william on September 21, 2017
82. ## chemistry

The reasons why copper dissolves in AgNO3 solution but remain insoluble in Pb(No3)2 solution.help me.thank you

asked by gbemisola on November 17, 2011
83. ## GN National Public School

If one third of 100 gm of 27% of aqueous solution is taken in a beaker and 10 gm of sugar is added to it,the concentration of resulting solution is.....

asked by saumya on October 24, 2015
84. ## science

6.025*10^20 molecules of acetic acid are present in 500 ml of its solution .What is the concentration of the solution?

asked by Kanchan on July 14, 2016
85. ## Analytical Chemistry

calthe culate mass of 10% stock solution required to prepare 0.8kg of 4%solution

asked by Shewa on July 21, 2013
86. ## Chem II

Find the a) % solution, b) molality and c) mole fraction of the acid 16.0 M H2SO4 d = 1.634 g/ml for the solution

asked by Ken on February 5, 2008
87. ## chemistry

What will happen if ammonium chloride solution is used to standardize the potassium tetraoxomangate(vii)solution?

asked by Stephen on May 20, 2017
88. ## chemistry

Calculate the molar it of a solution that contains 5.4 get of sodium sulfate dissolved in enough water to make 3.5 L of solution

asked by Ali on May 6, 2014
89. ## chemistry

If you dilute 27.0$${\rm mL}$$ of the stock solution to a final volume of 0.460$${\rm L}$$ , what will be the concentration of the diluted solution?

asked by hilllary on July 18, 2013
90. ## chemistry

What is the quantity of material of NH4Cl that should be added to a solution 0.1 of NH3 to form 1L of a solution with ph 8? Kb = 1, 8x10 ^-5

asked by william on June 5, 2018
91. ## chemistry

Suppose you wanted to dissolve 40.0 g of NaOH in enough H20 to make 6.00 L of solution and what is the molarity of the solution?

asked by Servando on February 22, 2011
92. ## chemistry

What is the pH of a solution prepared by dissolving 1.533 g HCl in water to make 420 mL of solution

asked by Nancy on December 17, 2012
93. ## Math

determine weather 10 is the solution of the equation x+10=36 is 10 the solution no use multiplcation principle 10x=-90 -9 3[7-9{6-2)]= -87 find -x when x=-62/83*= 62/83

94. ## chemistry

1L of a .2M solution of Ethanoic acid is altered by adding 5.00g of sodium butanoate. what is the pH of the new solution

asked by Lana on April 8, 2013
95. ## Chemistry

What is the molarity of a sucrose solution that contains 76.7 g of C12H22O11 (342.34 g/mol) dissolved in 138.2 mL of solution

asked by Linzy on April 8, 2013
96. ## chemistry

calculate the ph of a buffer solution containning 0.1M acetic acid and a 0.1M solution of sodium acetate

asked by dagi on January 14, 2016
97. ## chemistry

3. What is the ka for a solution of choloracetic acid (C2H5ClO2) which has a pH of 1.52 in a 0.112M solution? Please reply me as soon as possible sir Thank you George.

asked by George on June 15, 2010
98. ## Chemistry

If 3.5 mL of distilled water is added to 1.5 mL of 0.280 M CoCl2 solution, what is the concentration of the resulting solution

asked by Tashawna on June 23, 2011
99. ## Chemisrty

Calculate the amount of solute needed to make the solution .50kg of a 18% (m/m) KOH solution

asked by Monster on May 18, 2011
100. ## Chemistry help!!!

Calculate [H3o+] in each aqueous solution at 25*C, and classify each solution as acidic or basic. a. [OH-]= 1.1 x 10^-9M b. [OH-]= 2.9 x 10^-2M c. [OH-]= 6.9 x 10^-12M

asked by sally on March 14, 2011