# 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 159
1. ## URGENT CHEMISTRY

A solution of hydrogen peroxide is 24.26% by mass and has a density of 1.11g/cm^3. the molarity of the solution? 7.54M .273M 8.03M 8.37M none of these

asked by Cotton McKnight on March 9, 2011
2. ## Chem 2

What is the molarity of a solution composed of 8.210g of Potassium Chromate (K2CrO4),dissolved in enough water to make .500 L of solution

asked by Cassidy on December 17, 2012
3. ## Chemistry

How many milliliters of 0.540 M sodium sulfate solution would be needed to precipitate the calcium ion from 60.0 mL of 0.180 M CaCl2 solution?

asked by Anonymous on November 8, 2016
4. ## Chemistry

What is the morality of a solution prepared by dissolving 10.60g of sodium trioxocarbonate (v) in enough distilled water to obtain 250.0 ml of a solution?

asked by Charles on November 21, 2016
5. ## ChemB

A forming acid solution has a pH of 3.25. Which of these substances will raise the pH of the solution upon addition? Explain. A) HCl B) NaBr C) NaCHO2 D) KCl

asked by ALISON on March 12, 2012
6. ## Chemistry

What will be the concentration if 52 milliters of a solution that is 12 parts per million in sodium chloride is diluted with enough water to make 97 millilters of solution?

asked by Whitney on February 14, 2012
7. ## Chemistry 1200

For each of these solutions, determine the boiling point of the solution 0.238 M glucose (C6H12O6) in water (Assume the density of the solution is 1.00 g/mL.)

asked by Rukky on January 25, 2011
8. ## chem

a volume of 10.0 ml of a 0.00450 M solution of Cl- ions are reacted with 0.500 M solution of AgNO3.What is the maximum mass of AgCl that precipitates?

asked by sam on October 10, 2011
9. ## chemistry

How many milliliters of a 15.0%, by mass solution of KOH(aq) ( d= 1.14g/mL ) are required to produce 27.0 L of a solution with pH = 11.70? I'm really not sure how to do this, it's from Acids & Bases chapter. Any help is appreciated, thanks. (:

asked by Agatha on February 22, 2009
10. ## General Chemistry

Titration between iodine and thiosulphate. Why starch solution has to be added when the solution just turned pale yellow, but not at the beginning of reaction?

asked by ConfuseChem on November 30, 2012
11. ## chemistry

When excess solid Mg(OH)2 is shaken with 1.00 L of 1.2 M NH4Cl solution, the resulting saturated solution has pH = 9.30. Calculate the Ksp of Mg(OH)2 I am not sure where to even begin on this problem.

asked by Raj on March 21, 2010
12. ## chemistry

What is the molarity of the solution produced when 14.1 grams of ammonia is dissolved in sufficient water to prepare .100 liters of solution?

asked by Drew on May 22, 2012
13. ## chemistry

A lab technician determines the boiling point elevation of an aqueous solution of a nonvolatile, nonelectrolyte to be 1.95°C. What is the solution's molality?

asked by MaryBeth on November 4, 2010
14. ## CHEMISTRY

0.15g of hydrogen chloride (HCl) is dissolved in water to make 6.5L of solution. What is the pH of the resulting hydrochloric acid solution?

asked by Anonymous on February 17, 2014
15. ## BioChem

Write the chemical equation for the reaction that occurs when you add NaOH solution to NaH2PO4/Na2HPO4 buffer solution

asked by Megan on March 23, 2012
16. ## chemistry

Calculate the concentration (% W/V) of NaCl solution that was made by dissolving 15.0 g of sodium chloride in enough water to make 300.0 mL of solution.

asked by Chemistry Chick on October 29, 2011
17. ## chemistry

you have 20ml of an aqueous solution of 0.2M NaOH. if you add distilled water to this solution until you have 200ml , what will be the concentration? How many times did you dilute it?

asked by katlego on August 17, 2017
18. ## Chemistry

A solution of X2CO3 has a concentration of 15.2 g/dm^3. 25 cm^3 of this solution require 27.5 cm^3 of 0.2 M HCl for complete reaction. Calculate the ralative atomic mass of X

asked by Lily on June 28, 2014
19. ## Chemistry II

A solution is made by mixing 38.0 mL of ethanol, C2H6O, and 62.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C?

asked by Sam on July 17, 2012
20. ## Chem 121

A solution is made by dissolving 0.35 mole of LiI in enough water to give a final volume of 260.0 mL. What is the molarity of the solution?

asked by Barbara on July 26, 2011
21. ## chemistry

A solution of Na2CO3 is added dropwise to a solution that contains 1.34×10−2M Fe^2+ and 1.33×10−2M Cd^2+ . What CO3^2- concentration of is need to initiate precipitation? Neglect any volume changes during the addition.

asked by CHEMISTRY on March 14, 2009
22. ## chemistry

A lab technician determines the boiling point elevation of an aqueous solution of a nonvolatile, nonelectrolyte to be 1.95°C. What is the solution's molality?

asked by MaryJ on November 4, 2010
23. ## Chemistry

What is the molarity of a solution made by dissolving 2.00g of potassium chloride (KCl) in enough water to make 150 ml of solution?

asked by Gerard on April 19, 2017
24. ## Chemistry

KClO3 dissociated in H20 should form a neutral solution. The results proved to be a slightly acidic solution with a pH of 6. What happened?

asked by Misha on March 2, 2013
25. ## Chemistry

If I leve 750 mL of 3.6 sodium chloride solution uncoverd and 150 mL of the solvent evaporates overnight, what is the new solution concentration?

asked by Emma on February 20, 2014
26. ## chemistry

A lab technician determines the boiling point elevation of an aqueous solution of a nonvolatile, nonelectrolyte to be 1.62°C. What is the solution's molality?

asked by Catherine on March 3, 2013
27. ## Chemistry

A 4.379 g sample of MgCl2 is dissolved in enough water to give 750.0 mL of solution. What is the chloride ion concentration in this solution?

asked by Chris on April 14, 2014
28. ## chemistry

Calculate the pH reaches 30.0 mL one 0.200 M solution of HCl salt of amitriptyline is added 100.0 mL of a NaOH solution of concentration 80 mM.

asked by Maria on September 9, 2016
29. ## chemistery

A student dissolves 196 g of H3PO4 (Molar mass = 98 g) in enough water to make one liter of solution. The molarity of the solution is ?

asked by ogb on December 9, 2012
30. ## chemistry

If 150.0 Ml of HCL solution are required to react completely with .35 moles of solid NaOH whats the molarity of the solution?

asked by Aleander Azumah on October 12, 2009
31. ## Chemistry

A solution containing 20gm salt in 200gm alchol.if density of solution 11gm/L find mass by volume percentage

asked by osama khan on June 28, 2019
32. ## math

please check my work. 1. The number of words (x) Tina can type per minute is at Least 50. write and graph and inequality. (I broke it down to these 2 choices because the A & D was incorrect) B. x is less than or equal to 50 C. x is greater than or equal to

asked by kenzie on November 10, 2017
33. ## math - probability

With the use of diagrams, show that P(A′∩B′) = P(A∪B)' I just need help with understanding how these two equal each other so that i'm able to show it with diagrams. Also don't understand why the apostrophes are there :L, thanks.

asked by anonymous on January 17, 2018
34. ## English

I need to show proof in my essay as quote but would it be ok if I said something like "as illustrated" and not a direct quote because I am trying to show an action.

asked by Lena on May 4, 2009
35. ## Math

If two coins are tossed, what is the probability that the first coin will show heads and the second coin will show tails? a. 1/2 b. 1/4 c. 1/8 d. 1/16

asked by Help I need somebody not just anybody on June 5, 2017
36. ## St. Isaac Jogues Catholic School

The ratio of cats to dogs at a pet show is 1:3,what percent of the pets at the show are cats?

asked by Trisha on November 9, 2015
37. ## geometry

In the following figure given a circle C(o,3) Bp=AB and BA^N = 30 a) Calculate AP,BN and AN b)Calculate AQ and BQ c) Show That M is the mid point of (AP) d)Show that (OM)is perpendicular to (A)

asked by Nour on April 16, 2010
38. ## Pre-Calc

I need to figure out how to solve the equation x-squared y-squared+xy=1 i have no clue. I would appreciate any help! did you mean (x^2)(y^2) + xy = 1 ??? If so, are you solving for x or y? Suggestion: let xy = a, then you have the equation a^2 + a - 1 = 0

asked by Jill- on February 25, 2007
39. ## Geometry

Hello! I am just wondering the steps to solve this equation? Given sin α = n/m where n = 12 inches and m = 16 inches, solve for α to the nearest degree. So it would be Sin(a) = 12/16, however, I'm unsure on how to solve for the degree a. Any help is

asked by Evelyn W. on June 7, 2018
40. ## MicroEconomics

80. Firms in an industry that informally agree to charge the same price as the largest firm are an example of ______. (Points: 3) satisfying price extortion overt collusion ****tacit collusion 81. A dominant strategy equilibrium exists in a game when

asked by Danielle on August 13, 2010
41. ## Physics

How fast does a rocket need to be going to break free of Earth's gravity? How fast would it have to be going in order to completely leave the solar system? (For the second part of this problem, assume that the Sun is the only mass in the solar system and

asked by Kaitlyn on September 29, 2011
42. ## intro tobusiness

objective:increase market share by 5% in telecommunications industry. Identify at least 5 key activities management information system required to accomplish objection and list 3 Management information system resources that will that will be required to

asked by pat on February 4, 2009
43. ## math

Louis Braille devised a system of six raised or not-raised dots to signify a letter of the alphabet. a) How many different letters or characters may be coded in Braille? b) If you wanted to code 94 distinct characters, such as those found on a computer

asked by CL on April 7, 2010
44. ## Physics

How fast does a rocket need to be going to break free of Earth's gravity? How fast would it have to be going in order to completely leave the solar system? (For the second part of this problem, assume that the Sun is the only mass in the solar system and

asked by Kaitlyn on September 30, 2011
45. ## physics

A projectile is fired with muzzle velocity v uphill over ground that slopes at an angle α to the horizontal. If the angle of projection is θ to the horizontal: i) show that the horizontal range is x = 2v2 (cos θ sin θ − cos2 θ tan α) /g ii) find

asked by 12345 on October 12, 2014
46. ## easy geometry

Can you please show you solution and final answer here. Thanks! 1.Find the altitude,perimeter and area of an isosceles trapezoid whose sides have lengths 10 cm, 20 cm, 10 cm and 30 cm. 2. The formula A=P(a+r)^2 is used to find the amount of money A in an

asked by cyrus on December 14, 2014
47. ## Math

An aircraft pilot wishes to fly from an airfield to a point lying S20oE from the airfield. There is a wind blowing from N80oE at 45 km/h. The airspeed of the plane will be 550 km/h. (a) What direction should the pilot steer the plane (to whole degree)?

asked by Jerome on October 2, 2018
48. ## Physics-totally bewildered!!

I have a physics question. This is for extra credit which I really need to earn- If I made a solar cell how would I know which material is best to use if given choices like aluminum with a work function of 4.1eV at a cost of 2.40Kg or platinum with a work

asked by Joni on April 23, 2011
49. ## English

I'm posting you the sentences I'm most dubtful about. I included my doubts in parentheses. 1) Despite his victorious military campaigns Cromwell introduced unpopular restrictions on everyday life, such as, for example, the closing (?) of the theatres for

asked by Henry2 on September 18, 2011
50. ## chemestry

i don't know how to solve this problem,could anyone is here to give me the correct solution.It will be good for me. In a reactor of 1.5 L the same amount of C and H2O was introduced. When the reaction: C(s) + H2O ⇄ CO + H2 reaches the equilibrium at 1273

asked by Anonymous on June 19, 2016
51. ## Math

A class went on a field trip to see a play. Adult tickets cost \$18 each and student tickets cost \$12 each. There were 10 more students than adults that went to the play. If the trip cost \$240 in all, how many adults and students went to see the play? Write

asked by Unknown on February 29, 2016
52. ## math question

I am trying to study for a basic math entrance exam and can not recall how to work out the following question. Here it is: Three people who work full time are to work together on a project,but their total time on the project is to be equivalent to that of

asked by Heather on August 11, 2010
53. ## math

Solve the compund inequality and graph the solution. -4-2 and I did t+2

asked by robert on December 26, 2007
54. ## math

Solve the compund inequality and graph the solution. -4-2 and I did t+2

asked by robert on December 26, 2007
55. ## physics

how many excess electrons must be placed on each of two small metal spheres placed 3.00 cm apart in a vacuum if the force of repulsion betwen the spheres is to be 0.000000008 N? how do i solve this problem??=( help please.thx. Use Coulomb's Law: F = k

asked by Jarin on August 20, 2007
56. ## Math

Please help. 51. Solve: 125=(x3)/0.3^-3 a.7 b.14 c.15 d.9 53. 49x-2 = 7Ö 7 a.-5/4 b.5/4 c.11/4 d.-11/4 60. Simplify: 2log^3 6 - log^3 4 a.3 b.6 c.4 d.2 61. Solve the equation: logb (x^2 + 7) = 2/3logb 64 a.9 b.3 c. √23 d. ±3 62. Solve: (The fifth root

asked by Holly on May 21, 2013
57. ## Statistics/Probability

2. Two roommates, roommate X and roommate Y, are expecting company and are arguing over who should have to wash the dishes before the company arrives. Roommate X suggests a game of rock-paper-scissors to settle the dispute. Consider the game of

asked by y912f on July 7, 2013
58. ## medical office percedures

Work Place Application 1-Assume that you have been selected to order a new computer system for the physician. Clinic personnel include: three physicians, six administrative personnel, and four clinical assistants, plus you, the office manager. Describe the

asked by Elizabeth on January 24, 2012
59. ## Math

108 is 46% of what number? Write and solve a proportion to solve the problem. I think it's 38 correct me if I'm wrong

asked by Estephania on January 16, 2016
60. ## Calculus math

how do i solve these quadratics? c=10000 9a+3b+c=7975 36a+6b+c=6400 im unsure of how to solve as a and b are unknowns...

asked by Dg on May 21, 2015
61. ## Math

How would you solve this problem? Please include steps for me! Solve for θ in the interval 0 ≤ θ ≤ 2π: cos(θ )sin(θ ) − 1/ 2cos(θ ) = 0

asked by Harry on June 18, 2018
62. ## Math

f(x)=3/(x+1) g(x)=(x^3)/5 h(x)=x^2+7x+10 a. f(x)=10 b. f(x)=g(x) c. g(x)=h(x) d. f(x)=h(x) I am told to solve the equations, but the term "solve" is so vague. I don't know what I'm doing. Please help lead me in the right direction. Thank you.

asked by Morgan on January 24, 2013
63. ## maths

y varies partly as the square root of x when x=9 and y=3. Write the formular connecting them solve for x when y=17 solve for y when x=24

asked by Anonymous on April 16, 2016
64. ## math

I need to solve a literal equation -- Solve for h: A = 1/2bh If I divide both sides by 2b, then my answer would be h = A/2b Is this correct?

asked by Carly on October 2, 2018
65. ## math

helo sir/madam can u help me to solve this problem sOLVE 2log 15 +log(5-x)- log4x=2

asked by fizz on April 15, 2014
66. ## Math

Solve the following equation u+2=4 The question for me is how do I solve these types of problem. I already know that u=2, but I need to know the steps to get to the answer. Thanks, Kaai97

asked by Kaai97 on October 12, 2015
67. ## Algebra 1 (Step-by-Step)

Will someone explain how to solve this? Write each equation in standard form. Solve by using the Quadratic Formula. 1. -7 = x^2

asked by Victoria on May 12, 2014
68. ## Math

I don't know how to solve this equation. cos(30) = x / 6 How would I solve this to find the missing side of a 30-60-90 triangle?

asked by John on May 25, 2018
69. ## algebra

solve the formula for the given letter. Assume all variables represent non-negative numbers. E=jc^2 solve for c

asked by sam on July 11, 2010
70. ## Algebra

Hi, how would I solve these 2 equations using algebra? It states in the question that I have to solve them but all I can figure out to do is to rearrange them. y= 9x+50 y=9x+100 Many thanks

asked by Del on May 31, 2010
71. ## math

how to solve a prism with a square base that has a height of 45cm and its volume is 72000000cm^3. how do I solve it?

asked by asia on September 29, 2010

Please help me! I don't understand how to solve. Solve each equation for the given variable. 37. x/a - 1 = y/b for x 39. V = 1/3 * pi * r^2 * h for h What do these equations mean? I am super confused. Please help.

asked by Hayden on October 31, 2014
73. ## math

Write and solve a real-world problem that you can solve by using objects or drawing a picture.

asked by anton on February 25, 2016
74. ## Alg 1

Solve the proportion: 4/x = (radical sign over 11, not -1) 11 - 1/3 Please solve and explain. My answer does not match any of my choices.

asked by Jane on April 16, 2013
75. ## Algebra

i forgot how to solve these types of problems.. 2x^2-18x=0, x^2=6x+7, 6y^2+5y-6=0 Also SOLVE FOR X CORRECT TO 4 DECIMAL PLACES: x^2+6x+2=0 2x+4=3x^2

asked by Jenny on September 1, 2008
76. ## Math

Solve for x. .006x^3=8889 x = approx 114, but I don't understand how to get that answer. Can anyone help me solve? Thank you!

asked by Francesca on June 7, 2012
77. ## Math

Use properties of equality and numbers to solve each equation for x. A. 7+3x = 5x + 13 how am i suppose to solve i am kind of confused?!?!

asked by EmilyMay on April 3, 2012
78. ## Physics

Forcefriction=(Psin37+15*9.8)*.70 So Pcos37 must equal to the force, solve for P. how to get the magnitude of P??how to solve for P. thanks a lot~~

asked by Teresa on August 26, 2012
79. ## Algebra II

Solve: (2x – 3)(3x – 5) = 0 Solve by the quadratic formula. Leave the square root in your answer: 3x2 – x – 8 = 0

asked by JaneLee on November 28, 2007
80. ## Science

Hello :) my name is Deqa, i was wondering if anyone knew the affects of a state of a substance on the reaction so generally speaking does it matter if a solid is dissolved in a solution or is it faster for a solution be added to another solution basically

asked by Deqa on March 20, 2007
81. ## Math (5th grade)

There are 8 more girls than boys in the Math Club. The club has 44 memebers. How many boys and how many girls are in the club? Show your work.

asked by Leann on August 24, 2011
82. ## Algebra

Can you please help with this problem: At Super Saver Mart (SSM), you can buy three packs of toilet paper and seven boxes of cereal for \$46.00. You can also purchase 8 packs of toilet paper and 4 boxes of cereal for \$75.00 at SSM. What is \$14 more than the

asked by Leroy on December 10, 2016
83. ## Biology

A student wishes to prepare 300 mL of 0.25 M sucrose. He puts 25.7 g of sucrose in a beaker and then adds 300 mL of dH2O. The total volume of the solution after the sucrose has been dissolved is 330 mL. a) What did he do wrong when preparing his solution?

asked by Ki on September 14, 2014
84. ## human resource

I am writing a paper on this subject and I need help can someone please help . Introduction – Performance Management Process II. Purpose of Employee Performance Appraisals a. Evaluating employee’s skill levels b. Feedback Opportunities i. Employee

asked by sandra on December 3, 2008
85. ## Environmental Science

Your grandparents, who loves to garden, are thinking about buying a house in a country. Next weekend, they are going to look at two houses. One has a large garden that is part of a small farm that was abandoned 25 years ago. Use what you know about

asked by Qiayamah on December 22, 2006

John is at a car show. Beginning 2.5 miles away, a car travelling at a constant 45 miles per hour approaches and then passes John. The distance between John and the car can be represented by the equation d = |2.5 – 45t|. At what times is the car 0.5

asked by Sammy on December 6, 2015

John is at a car show. Beginning 2.5 miles away, a car travelling at a constant 45 miles per hour approaches and then passes John. The distance between John and the car can be represented by the equation d = |2.5 – 45t|. At what times is the car 0.5

asked by Sammy on December 6, 2015
88. ## Calculus

Does my answer look correct? Find the derivative. 11, y= (e^3-e)(e+5)/6e my work: ((6e)(4e^3 + 15e^2 - 2e - 5) - (6)(e^4 + 5e^3 - e^2 - 5e))/ (6e)^2 Multiplied/divided everything through My answer: (10e^2 + 30e - 3)/ 18 I cant follow your work: I assume e

asked by Alexandra on December 19, 2006
89. ## science

ogranelle that modifies,packages and transport material out of the cell describes an organism that can exist onlly as a group of cells one of the structures a cell uses t o live ,grow and reproduce Why have you posted all these questions under different

asked by ruth on August 19, 2007

If a person has more mass do they do more work or exert more power? (When walking up the stairs) (Compared to a person with less mass) Am I on the right track? This is what I have so far... The person with most mass does not necessarily do the most work.

asked by Gigi on September 17, 2014
91. ## math

Please show me how to solve: Hannah took a survey of 500 students at her school to find out whether they liked baseball or football. The results are shown in the Venn diagram. How many of the students surveyed like football? 28% liked baseball, 32% liked

asked by Jane on November 19, 2011
92. ## algebra

graph each of the following equations below using their intercepts?. 25x + 50y - 100 = 0 find the intercepts Y intercept is when x is zero x intercept is when y is zero. plot those points, connect the dots. please answer my question with solution. 2y - 8x

asked by jenny on January 31, 2007
93. ## Math

"You have been asked to help build a rectangular play area at the new Tracy elementary school. You arrive at the site eager to begin! Much to your surprise, the only things available to work with are two pieces of rope. Explain how you can use the rope to

asked by Amanda on December 20, 2013
94. ## Math

How many ounces of 1% antifreeze solution must be added to 100 ounces of 40% antifreeze solution to obtain a 16% antifreeze solution? how do I set this equation up?

asked by Mark on September 29, 2017
95. ## Math

Solution A is 80% Alcohol and Solution B is 30% Alcohol. How many Liters of each Solutions should be mixed in order to make 200 liters of a Solution that is 62% Alcohol ?

asked by Wendy on April 16, 2009
96. ## Physics

Draw a block and tackle system of pulleys with a velocity ratio of 5.A block and tackle with a velocity ratio of 5 is used to raise a mass of 25kg through a vertical distanceof 40cm at a steady rate. If the efforts is equal to 60N, determine a)d distance

asked by Nelson on January 4, 2017
97. ## statistics

Use the method specified to perform the hypothesis test for the population mean µ. The highest acceptable level of pesticide found in quail has been limited to 0.35 parts per million (ppm). A hunting organization measured the level of the pesticide found

asked by looking for someone to varify my work please on April 13, 2010
98. ## Pharmacy Technician

RX: Chlorpheniramine 100 ml Lidocaine 2 oz Banana flavoring 1 tsp Take 7ml BID Refrigerator medication at 40°F. 1. What is the final volume in ml? 2. Convert: 40°F = ______ °C=4 3. How many 1oz bottles will this solution fill? 4. How many days will this

asked by Marii on June 19, 2015
99. ## Chemistry

I am having trouble getting this starting and figuring out the correct steps...the problem is Calculate the final concentration of the solution in each question 1) Water is added to 0.270 L of a 6.00M HCl solution to give a volume of 3.00 L (Express

asked by TT on December 9, 2010
100. ## Math

I missed these problems on my test and I want to see how you would do them the correct way! 1. Solve the equation: 1-2r-8=-3(6r-7)+4(r-1) 2. Solve the inequality: -55>-4(1+4x)-3

asked by Anonymous on December 15, 2013