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

92,096 questions, page 425
1. chemistry

calculate the molarity of 29.25 grams of NaCl in 2.0 liters of solution

asked by Anonymous on May 28, 2013
2. HHS

What is the molality of a solution in which 15g of I2 is dissolved in 500g of alcohol?

asked by jaz on April 4, 2011
3. science

How many grams of glucose C6H12O6 would you need to make 250 mL of 1.0M solution?

asked by kevin on May 29, 2013
4. precal 2

find values for b such that the triangle has no solution A=88 degree, a=315.6

asked by danielle on July 29, 2011
5. Chem

Specify the concentration of each ion in solution for the following: .10 M AlCl3 (aq) and .15 M (NH4)2SO4 (aq)

asked by Sarah on February 13, 2017
6. Algebra

please help or examples!!!How many intergers are common to the solution sets of both inequalities? x+7>or = to 3x 3x+4

asked by alex on December 10, 2013
7. Chemistry

What happens when an electric current is passed through a solution of an ionic compound?

asked by Aybrianna on November 13, 2017
8. calculus

find the general solution x^2-2(e^y)dy/dx = y^3+e(x^2) i am getting the y^3 dx when i do seperation of variables how do i deal with this.

asked by brad on December 16, 2009
9. Biology

How many grams of NaCl do you need to make 150ml of a 0.8M stock solution?

asked by Keirra on September 8, 2012
10. chemistry

what you would do to prepare 100.0g of a 3.5% solution of ammonium sulfate in water

asked by Anonymous on May 13, 2010
11. science

Calculate the molarity of 500. mL of solution containing 21.1 g of potassium iodide

asked by kate on October 12, 2010
12. MATH (Problem Solving)

Find the general solution algebraically. 2 cos^2x=7cosx-3

asked by Anonymous on September 5, 2009
13. chemistry

What is the molality of a solution containing 11.1 g Na2SO4 dissolved in 2269.2 g of water?

asked by john on February 19, 2017
14. Chemistry

How many grams of NaF are needed to make 50 mL of a 2% aqueous solution?

asked by Angel Hernandez on April 14, 2015
15. Chemistry

Assume you are starting with a 10x solution. how would you make it a 7.5x dilution?

asked by Nance on May 27, 2013
16. chemistry

What is the pH of the solution created by combining 0.80 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)?

asked by Cindy on July 12, 2010
17. chemistry

The poH of a solution of 0.25mol/dm3 of Hcl acid is

asked by peter onoriode on March 10, 2011
18. chemistry

how many moles of LiF would be required to produce a 2.5 M solution with volume of 1.5 M?

asked by kirari on August 15, 2010
19. Math

If x = xo and x = x1 are both vector solution of Ax=b, then x1 - xo is in the Null Space of A. True or False?

asked by Anonymous on September 7, 2012
20. CHEMISTRY

DESCRIBE BRIEFLY HOW U WOULD PREPARE ONE LITER OF 0.1 NaOH SOLUTION

asked by IFEOMA on July 29, 2011
21. Math

1. Which of the following ordered pairs is a solution of the equation y=-4x^2? (1 point) (-2, 16) ***My answer*** (1, -8) (0, -4) (2, -16)

asked by Rose on March 5, 2019
22. chemistry

Calculate pH for strong base solution: 15.0 mL of 1.20×10^−2 M Ca(OH)2 diluted to 460.0 mL

asked by jeff on February 26, 2012
23. math

Which is the value is in the solution set for the inequality -8-7x>6 A=-1 b=-2 c=-3 d=2 -8-7x>6 add 8 to each side -7x>14 -7/-7>14/-7 x

asked by b6 on January 3, 2013
24. Chemistry

How many moles of electrons are required to produce 23.8 g Cu from a CuSO4 solution?

asked by Angel on May 2, 2010
25. General Chemistry

A solution of LiCl in water has XLiCl = 0.0800. What is the molality?

asked by jamiya on September 18, 2012
26. Math

Use digits 0 through 9, without using a digit more than once, so that you can make the following reduce to a solution of x < -1/2 How do I do this? Please help, I am confused.

asked by Maya on February 8, 2017
27. Analytical chemisty

How many grams of K2Cr2O7 are required to prepare 500 ml of a 0.13 N solution?

asked by Anonymous on February 2, 2013
28. chemistry

The solubility of AB(s) in a 1.000-M solution of C(aq) is found to be 0.121 M. What is the Ksp of AB?

asked by help please on May 7, 2014
29. 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
30. Valencia

2.0L of a 2.0M HCl solution is added to water so that the final volume is 6.0L

asked by Lisa on November 6, 2012
31. Clinical Calculations

What weight of NaOH would be required to prepare 3000 ml of a 2.5M solution?

asked by Tamaka on November 8, 2009
32. Chemistry

Calculate the concentration of the hydronium ion([H3Ol+]) for a solution with the pH = 4.5

asked by Lisa on March 25, 2012
33. science

why doesn't solute added to a saturated solution dissolve

asked by Anonymous on November 8, 2009
34. Algebra

I have answered the question but not sure how to check for extraneous solution. x/(5x+4)=3 The answer is -6/7

asked by Eric on February 8, 2017
35. Chemistry

Calculate the pH of a 1.19M sodium formate, HCOONa, solution.

asked by Bill on November 23, 2014
36. Chemistry

Calculate the pH and concentration of H3O of a 0.285M HCl solution.

asked by Kat on January 22, 2015
37. chemistry

will SrSO4 precipitate when .1g of Na2SO4 are added to 1L of a .01M solution of Sr

asked by brittney on March 21, 2012
38. Math

Determine the solution set to the equation: 2sin^2x+cosx-2=0

asked by Mac on March 2, 2009
39. math

The graphs of ​ f(x)=−5/3x+9 ​ and ​ g(x)=2^x−1​ intersect at (3, 4) . What is the solution of −5/3x+9=2^x−1 ? Enter your answer in the box.

asked by Jay on February 11, 2017
40. Algebra

Do the equations x = 4y + 1 and x = 4y - 1 have the same solution? How might you explain your answer to someone who has not learned algebra?

asked by Theresa on September 6, 2012
41. algebra 1

Do the equations x = 4y + 1 and x = 4y - 1 have the same solution? How might you explain your answer to someone who has not learned algebra?

asked by Austin on September 6, 2012
42. Science

Calculate the pH of an aqueous solution containing 1.3 * 10^-2 M HCl, 3.0 * 10^-2 M H2SO4, and 2.0 * 10^-2 M HCN.

asked by Will Coppock on July 24, 2012
43. Algebra 1

Do the equations x = 4y + 1 and x = 4y - 1 have the same solution? How might you explain your answer to someone who has not learned algebra?

asked by Austin on September 6, 2012
44. chemistry

Suggest a technique the student could try to reduce the concentration of the 12 M solution.

asked by sam on April 3, 2011
45. Math

1. Which of the following ordered pairs is a solution of the equation y=4x^2? (1 point) A. (-2, 16) ***My answer*** B. (1, -8) C. (0, -4) D. (2, -16)

asked by Rylan on March 4, 2019
46. chemistry

Malarity is to moles of solute over liters of solution as molality is to

asked by anita on May 23, 2011
47. College Algebra

Change 2x^2-5x=25 to standard form. Then find the solution set.

asked by Amanda on May 5, 2011
48. math

find the genearal solution of the following equation 4csc^2x-7=cotx

asked by beracah on May 20, 2016
49. acid and base titrations

what is the pH of a solution prepared by adding 0.50 mol KOH to 1.0 L of 0.30 M HNO3?

asked by jj reddick on November 21, 2010
50. Chem help

Calculate the pH of a solution containing 0.00001 moles of H3O per liter.

asked by Lindsey on November 16, 2012
51. chemistry

what is the concentration of na and co3 ions in 0.2M aqueous solution of na2co3

asked by Anonymous on August 20, 2016
52. math

Find values of x and y, if any, that will make the matrices equal. [ x y ] = [ 3 5 ] 1 9 1 9 a. x=-3,y=-5 b. x=5,y=3 c. x=-3,y=5 d. x=3,y=5 e. no solution

asked by laura on August 26, 2016
53. trig

Find the general solution for x if cos2x + sin3x = sinx

asked by Tiana on March 18, 2012
54. Chemistry

What is the density of a solution of 9.0% Calcium chloride dissolved in water?

asked by Cassie on September 9, 2012
55. Saint Louis University

Let f(x,y)=sqrt((x-a)^2+(y-b)^2+(z-c)^2). Minimize f subject to Ax+By+Cz+D=0. what is the geometric meaning of your solution?

asked by Micx on March 2, 2011
56. chemistry

How many moles of NaOH must be added to 1.00L of this solution to increase the PH to 9.25?

asked by Heather on July 18, 2012
57. Chemistry

What is the pH of a buffer solution that is 0.20M methylamine and 0.15 M methylammonium chloride. which do i get the pH of

asked by LT on April 2, 2008
58. Chemistry

a 0.20 mol/l solution of weak base hpo4 has a ph of 9. find the Kb

asked by Dawn on June 2, 2016
59. algebra plsssSSS

What are the real or imaginary solution of the polynomials x^4 -52x^2 +576=0

asked by allexelle on April 12, 2015
60. chemistry

What is the number of moles of NaOH in 1.91 mL of a 872.25 molar solution?

asked by chels on October 19, 2011
61. biology lab

how many grams of mercury II Nitrate will you need to prepare 500mL of a .60 M solution ?

asked by nicole on February 24, 2017
62. algebra 5

write the solution in interval notation x

asked by Anonymous on May 12, 2010
63. Chemistry

a 0.20 mol/l solution of weak base hpo4 has a ph of 9. find the Kb

asked by Dawn on June 1, 2016
64. Chemistry

How can I determine the H3O+ concentration of 0.50 M HCHO2 if I don't have the Ph of the solution?

asked by Er on February 7, 2018
65. Algebra

write the solution in interval notation x

asked by Anonymous on May 12, 2010
66. Mendulo

what mass of H2SO4 is contained in 25g of 15percent w/w solution?

asked by Titus on August 21, 2016
67. Chemistry

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

asked by Jewel on January 31, 2016
68. Chemistry

A solution formed by dissolving an antacid tablet has a pH of 9.18. Calculate [H+].

asked by Anonymous on April 27, 2014
69. 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
70. chem 150

calculate the molarity of 700grams of NaOH in 2 liters of solution

asked by nick on June 22, 2011
71. Chem

How would we make 500mL of a 1.5 percent w/v solution of KC1 in water?

asked by Stacy on October 11, 2012
72. chemistry

at 25 celcius, how many dissociated OH ions are there in 8.0x10^-1 L of aqueous solution with pH 4.73?

asked by Christine on November 16, 2015
73. Chemistry

Explain what would happen if a saturated solution of kno3 at 50°c is heated

asked by Miya pierre on November 16, 2015
74. Math

Write a multiplication equation with one variable and one fraction that has the solution 8.

asked by BOI on February 7, 2018
75. Algebra

What is an estimate of the solution of the equation 6n+3=2? Use a table I don't know how to get the answer :(

asked by Mari on June 6, 2016
76. Chemistry

If you have 200 mL of a 0.50 M solution of KOH and you wish to dilute it to 0.30 M, how many mL of water should you add?

asked by asdffffff on April 6, 2011
77. Chemistry

What are the concentrations of OH– and H in a 0.00070 M solution of Ba(OH)2 at 25 °C? Assume complete dissociation.

asked by Mark on October 20, 2011
78. 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
79. chem

a solution that is 0.51 M CH3COOH and 0.28 M CH3COONa is that a buffer? when can u tell when to us the henderson hasslebach

asked by Rick on March 6, 2009
80. chemistry

what is the pH of an aqeuous solution with s hydroxide ion[OH-] concentration of 7.5x10-10 M?

asked by katie on May 7, 2008
81. 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
82. chemistry

how many moles of Cl- ion in the solution containing 0.187g Cl- dissolved in 50.0 ml water.

asked by mel on October 23, 2007

how does the salinity of a solution affect osmosis in an onion cell?

asked by Kasey on March 1, 2011
84. chemistry

If you have 200. mL of a 0.50 M solution of KOH and you wish to dilute it to 0.30 M, how many mL of water should you add?

asked by Ashley on April 6, 2011
85. Chemistry

How many grams of Ni(OH)2 are produced from the reaction of 45.0mL of 1.75 M NaOH solution?

asked by Garrett on November 28, 2010
86. math

which of the ff. coordinates of points belong to the solution set of the inequality y

asked by =) on July 27, 2014
87. Chemistry

What is the chemical reaction of urea with copper nitrate solution?

asked by Ariro Mervin on March 9, 2019
88. 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
89. biology

what is the original color of Phenolphthalein solution? pink or colourless?

asked by Yuni on July 30, 2011
90. science

determine the molar concentration of Ca^2+ and Cl- in a .075 M CaCl2 solution

asked by abby on March 9, 2011
91. Science

Determine the molar concentration of Ca^2+ and Cl- in a .075 M CaCl2 solution

asked by Moses on March 9, 2011
92. math

use set-builder notation to describe the complete solution 5[3m-(m+6)]>-6(m-5)

asked by jay jay on July 14, 2008
93. Inorganic chemistry

What change in coulombs, is required to deposit 0.301 g Cu(s) from a solution of Cu^2+(aq)

asked by Steve on April 11, 2009
94. chemisty

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

asked by asif on November 15, 2015
95. science

Can a solution be made by mixing a solid,liquid,and gas?

asked by 5th physical prop of matter on November 10, 2010
96. Chemistry

Calculate the permanganate activity in an aqueous 0.18 M KMnO4 solution.

asked by RC on August 12, 2013
97. science

determine the molarity of the following solution 31 g MgF2 in 55ml H20

asked by willie on January 8, 2013
98. chemistry

How many milliliter of 2.5 M NaOH are neededto neutralize 2.7 ml of a 4.9 M H2SO4 solution?

asked by kelli on April 29, 2014
99. math

Find the remainder when 33! is divided by 37. Please give full solution.

asked by bob on August 12, 2013
100. chemistry

Two aqueous solutions are mixed: 50.0 mL of 1.60×10−2 M H2SO4 and 50.0 mL of 3.75×10−2 M NaOH. what is the PH of the following solution?

asked by anonymous on April 11, 2010