# 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 616
1. ## Math

Mabel is installing a square pool in her backyard and wants a circular fence to enclose the pool to create 4 grassy areas around the pool as show in the figure. If the pool is located at the coordinates (1, 5), (5, 8), (4, 1), and (8, 4), what is the

asked by Zyere on January 5, 2015
2. ## Literature

I need to write a vignette on a character that will catch my reader's interest. I'm supposed to use the vigentte 'Salvador Late or Early' by Sanda Cisneros. my book says, "Use colorful verbs to show what your character does all day- early and late" I need

asked by mysterychicken on October 15, 2009
3. ## Math

270 tickets were sold at a school event. The total money collected is \$1700, if the adults cost \$10 and the student section cost \$5. How many adult tickets were sold? My teacher gave this to us but he didn't explain it how. Can you help me answer this

asked by Anonymous on September 18, 2016
4. ## Business Communication

When an audience feels your message is unimportant to them, you should: A. Use threatening language to show your seriousness of the matter. B. Make any action requested as easy as possible to accomplish. C. Avoid imposing deadlines for action. D. Make the

asked by Minnie on January 10, 2014
5. ## Human Services Administration

Evaluate each mission statement based on the following: • Beliefs • Mission • Vision • Culture • Goals • Products Show how each one of the mission statements does or does not meet the requirements of a good mission statement. I am not quite

asked by Crystian on August 2, 2011
6. ## Algebra 1

"Graph each system of linear inequalities. Give two ordered pairs that are solutions and two that are not solutions." How do I find these solutions in order to "give two ordered pairs that are solutions and two that are not solutions."?

asked by Anonymous on January 15, 2014
7. ## Chemistry

Please show me the steps..... At STP, 3.00 L of nitrogen gas contains the same number of molecules as A) 1.00 L of nitrogen gas B) 2.00 L of oxygen gas C) 3.00 L of chlorine gas D) 4.00 L of hydrogen gas

asked by Kiesha on December 1, 2010
8. ## math

A magician has 3 more red hats than black hats and 4 fewer purple hats than black hats and has 14 hatsin all. How many hats of each color does he have. Show how you got the answer.

asked by zach on September 14, 2009
9. ## English

The teacher will show the students a picture of a bess beetle with all the parts labeled. Does bess need to be Bess? I used bess beetle through my whole paper not sure when to capitalization bess.

asked by Pete on April 13, 2011
10. ## Calculus

Given the function: f(x) = x^2 + 1 / x^2 - 9 a)find y and x intercepts b) find the first derivative c) find any critical values d) find any local(relative) extrema e) find second derivative Please show me how u got this!!

asked by Gabby on April 27, 2013
11. ## Math

Dr. Jane I came up with this: 127,128,129,139,139,139,141,143,144,145,146,147,148,152 Does this seem to work?

asked by John on March 10, 2013
12. ## Calc II

A worker on scaffolding 65 ft above the ground needs to lift a 390 lb bucket of cement from the ground to a point 20 feet above the ground by pulling on a rope weighing 5 lb/ft. How much work is required?

asked by Liz on October 16, 2012
13. ## literature

Compare and/or contrast the role of the father-son relationship in The Odyssey to the relationship of Abraham and Isaac in the Old Testament. How does each relationship influence the action and theme(s) of each work?

asked by me on September 11, 2007
14. ## chemistry

a gas sample heated in a cylinder uses 650kJ of heat. a piston that compresses this gas does 800kJ of work. What is the change in internal energy, ^E of the gas during this process?

asked by harry on February 12, 2013
15. ## Physics

A load of 500N is raised through 5m by a machine when it's effort E moves simultaneously through a distance of 25m along it's direction. If the machine has efficiency of 80% , calculate a) Total work done by machine. b) Value of E

asked by Yahya Shekha on October 25, 2018
16. ## Physics

The temperature of a monatomic ideal gas remains constant during a process in which 4500 J of heat flows out of the gas. How much work (including the proper + or - sign) is done on the gas? J

asked by Pierre on April 19, 2008
17. ## lit

Compare and/or contrast the role of the father-son relationship in The Odyssey to the relationship of Abraham and Isaac in the Old Testament. How does each relationship influence the action and theme(s) of each work?

asked by me on September 11, 2007
18. ## Math

A person is pulling a freight cart with a force of 70 pounds. How much work is done in moving the cart 120 feet if the cart's handle makes an angle of 18° with the ground

asked by Justin on December 2, 2012
19. ## Physics

the charges an coodinates of two points charges located in x-y palne are : q1=+3*10^-6 C ; x=+3.5 cm . y=+0,5 cm and q2=-4*10^ -6 C; x= - 2 cm y=+1.5 cm . (a)Find the electric potential at the origin(b)How much work must be done to locate these charges at

asked by Jc on February 22, 2012
20. ## physics

Suppose you carry a bag of groceries weighing 127 N from your car to your kitchen, a distance of 48 m, without raising or lowering the bag. (a) What is the work done by the force you exert on the bag?

asked by Kellie on October 1, 2011
21. ## Physics

A horse pulls a cart with a force of 180.0 N at and angle of 33.0° with respect to the horizontal and moves along at a speed of 11.0 km/hr. How much work does the horse do in 8.6 min? What is the average power of the horse?

asked by Sam on February 26, 2014
22. ## math,help

can some one help me set this up into eqautions to be solved please. One number is 6 more than another. If the sum of the smaller number and 3 times the larger number is 34, find the two numbers. x=10 y=4 Those are the answers but how do you get to them. 3

asked by jasmine20 on February 13, 2007
23. ## Physics/Energy

A cop of mass of 90.0 kg is chasing a robber and runs up 5 flights of stairs in 20.0 sec. The cop has gone a vertical distance of 12.0 m. Determine the amount of work done by the cop to get to this height.

asked by Nana on January 24, 2017
24. ## physics

A worker on scaffolding 75 ft above the ground needs to lift a 410 lb bucket of cement from the ground to a point 25 feet above the ground by pulling on a rope weighing 5 lb/ft. How much work is required

asked by Anonymous on October 15, 2014
25. ## Math (Limits)

Consider the following function. f(x) = 2x^2 − 8x Find the limit. lim (Δx->0) (f(x+Δx)-f(x))/(Δx) How would I set up the equation to work with that function? I know how to plug in the values usually, but how would I do this for that function

asked by Ray on October 11, 2016
26. ## chemistry

The heat lost or gained by a system is related to its temperature change by a property called its heat capacity. The molar heat capacity of metals at or above room temperature equals 24.92 J/K.mol. The temperature of a block of lead (MM 207.2) was raised

asked by korko on September 25, 2014
27. ## physics

In a lab, a student measures the unstretched length of a spring as 0.109 m. When a 131.4-g mass is hung from the spring, its length is 0.201 m. The mass-spring system is set into oscillatory motion, and the student observes that the amplitude of the

asked by janny on February 21, 2012
28. ## Chemistry

To neutralize a 0.5192 g organic acid, 44.0 mL NaOH solution (1.00 ml ~ 1.12 mL HCl ~ 0.0100 g CaCO3) is required. What is the equivalent weight of the organic acid?

asked by Summer on January 21, 2014
29. ## Chemistry

How many electrons are transferred in the reaction of hydrogen peroxide with iron (II) ion in acidic solution to form iron (III) ion and water?

asked by Jen on August 8, 2008
30. ## college chemistry

10.0 mL of 0.15M of sulfuric acid is titrated with 0.05M of sodium hydroxide. how many mL of sodium hydroxide solution are required to reach the equivalence point?

asked by tim on November 17, 2010
31. ## newsome

1. lactate has a molecular weight of 90.08. How much lactate is needed to make 3 liters of .15 molar lactate. 2.What is the percentage of lactate (it's a solid) in the solution made in question 1.

asked by chemistry on November 13, 2014
32. ## chemistry

what is the boiling point of an aqueous solution that freezes at -67 degrees C? I was given this answer What is 100+6.7 (1.86/.52) ? so 100+6.7 = 106.7 1.86/.52 = 3.58 is the .52 the Kb I got the answer in the book I just don't understand how they got to

asked by swtnblk on November 5, 2011
33. ## chemistry

What concentration of aqueous CaCl2 solution freezes at -10.2ºC? The freezing point of pure water is 0.0ºC and Kf of pure water is -1.86ºC/m.

asked by Cecilia on September 1, 2010
34. ## chemistry

the mole fraction of urea (molar mass = 60g/mole) in a solution prepared by dissolving 16g of urea in 39g of h2o

asked by jessie on September 13, 2010
35. ## quadratic equations

The solution to a quadratic equation is x is equals to 3 plus or minus square root of 4 minus 8p all over 4 where p is the element of Q. Determine the value(s) of p that the roots of the equation are equal and non-real

asked by Andiswa on March 6, 2016
36. ## Chemistry 102

What is the freezing point in ∘C of a solution prepared by dissolving 6.60 g of MgCl2 in 110 g of water? The value of Kf for water is 1.86 (∘C⋅kg)/mol, and the van't Hoff factor for MgCl2 is i = 2.7.

asked by Dee on September 23, 2015
37. ## college chemistry

10.0 mL of 0.15M of sulfuric acid is titrated with 0.05M of sodium hydroxide. how many mL of sodium hydroxide solution are required to reach the equivalence point?

asked by tim on November 17, 2010
38. ## chem

a solution of weak acid of molarity 0.05 mol/dm3 is titrated against 0.1mol/dm3 NaOH, the pka = 3.67 what volume of acid would u use in ur titration?

asked by Kimora on December 7, 2008
39. ## CHEMISTRY.

Lowering of vapor pressure is directly proportional to: a) Temperature b) Mole fraction of Solute c) Mole fraction of Solvent d) Amount of solution

asked by Riana on December 15, 2013
40. ## AP Chemistry

A solution is made by mixing exactly 500 mL of 0.167 M NaOH with exactly 500 mL of 0.100 M CH3COOH. Calculate the equilibrium concentrations of H+, CH3COOH, CH3COO-, OH-, and Na+.

asked by Allison on February 16, 2014
41. ## CHEMISTRY.

Lowering of vapor pressure is directly proportional to: a) Temperature b) Mole fraction of Solute c) Mole fraction of Solvent d) Amount of solution

asked by Riana on December 15, 2013
42. ## Chemistry

A solution is made by mixing 5.00 × 102 mL of 0.167 M NaOH with 5.00 × 102 mL of 0.100 M CH3COOH. Calculate the equilibrium concentrations of H+, CH3COOH, CH3COO−, OH−, and Na+.

asked by Sandhya on March 20, 2015
43. ## analytical chemistry

0.100 M NaOH (in the burette) is titrated with 25.0 mL 0.120 M CH3COOH (pKa = 4.75) in a conical flask. Determine the pH of the solution in the flask after 10 mL of the NaOH has been added.

asked by TaeRa on April 2, 2016
44. ## chemistry

10.0 mL of 0.15M of sulfuric acid is titrated with 0.05M of sodium hydroxide. how many mL of sodium hydroxide solution are required to reach the equivalence point?

asked by tim on November 17, 2010
45. ## CHEMISTRY.

Lowering of vapor pressure is directly proportional to: a) Temperature b) Mole fraction of Solute c) Mole fraction of Solvent d) Amount of solution

asked by Riana on December 15, 2013
46. ## Chemistry

Balance the equation in aqueous basic solution: NO2-(aq) + Al(s) → NH3(aq) + AlO2-(aq) I know how to balance equations in acidic solutions, but I get lost doing the basic one, please help?

asked by Jessie on May 31, 2011
47. ## AP Chemistry

What is the hydrogen ion concentration in a solution having a pOH of 5.74? Answer in units of M. I initially did 14-5.74=8.26 to find the pH, then I did 10^(-8.26) to find molarity and I got 5.495, which is wrong... what did I do wrong?

48. ## chemistry

what is the effect of barium chloride solution, dilute hydrochloric acid and dilute trioxonitrate(v) acid on iron II ammonium sulphate hexahydrate

asked by Kenneth on April 17, 2013
49. ## Chemistry

What is the required volume in ml to prepare a liter of solution 0.1 mol of nitric acid. molar mass 63 g / mol Density 1.41 g / ml, 75% weight by weight...

asked by Anonymous on February 19, 2016
50. ## science

when a zinc is placed in a copper(ii)nitrate solution,the strip becomes coated with copper.write down the oxidation half reaction for the reaction that takes place.

asked by BONNY on August 25, 2012
51. ## chemistry

In the reaction of hydrogen peroxide with iron (II) ion in acidic solution to form iron (III) ion and water, the oxidizing agent is

asked by same on July 2, 2008
52. ## Chemistry

A sample of 30.0 mL of sulfuric acid solution was titrated with 0.720 M KOH. It was found that 46.9 mL of the base was needed to neutralize the acid. What is [H2SO4]? would you do (30.0)(0.720) / 46.9 ?

asked by Hannah on October 12, 2011
53. ## Chemistry

if 12.8g of NaCl is added to 243.2 mL of water (density (1.00g/mL)). the volume occupied by the solution is 250.0 mL. Calculate the density of the salt water.

asked by Anonymous on August 28, 2016
54. ## chemistry

You need to make a .300 M solution of NiSO4 aq. Calculate the mass of NiSO4 6H2O you should put into a .100-L volumetric flasl _____= mass in g

asked by lens on July 1, 2018
55. ## ap chemistry

What is the pH at the point during a titration when 34 mL of 0.200 M HCl has been added to 29 mL of 0.0500 M NH3 solution? HCl is a strong acid, Kb=1.8×10−5 for NH3. Answer in units of pH

asked by gabriella on February 4, 2014
56. ## Chemistry

A saturated solution of potassium nitrate in water is prepared at 70.0*C then cooled to 55.0*C how many grams of potassium nitrate crystallized--- how do I determine this using my graph with everyone's numbers

asked by Melissa on May 8, 2013
57. ## chemistry

How many electrons are transferred in the reaction of hydrogen peroxide with iron (II) ion in acidic solution to form iron (III) ion and water?

asked by Liz on April 15, 2008
58. ## quadratic equations

The solution to a quadratic equation is x is equals to 3 plus or minus square root of 4 minus 8p all over 4 where p is the element of Q. Determine the value(s) of p that the roots of the equation are equal and non-real

asked by Andiswa on March 6, 2016
59. ## chemistry

If 100 mL of a 3 M solution of sodium hydroxide is diluted to a total volume of 600 mL with distilled water, what will the final concentration of sodium hydroxide be?

asked by Brittany on February 17, 2010
60. ## science

Ravi prepared a solution of sodium chloride by mixing 5.85g of salt in 1l of water.Find molar mass of sodium chloride?

asked by rohini on February 3, 2016
61. ## chemistry

How many electrons are transferred in the reaction of hydrogen peroxide with iron (II) ion in acidic solution to form iron (III) ion and water?

asked by Gloria on April 16, 2008
62. ## Chemistry

Determine the solubility of a sodium sulfate, Na2SO4, in grams per 100g of water, if 0.94 g of Na2SO4 is dissolved in 20 g of water to make a saturated solution.

asked by Alex on May 3, 2013
63. ## Math

One-third of Derick's age two years ago is equal to a quarter of his age four years from now. How old is he now? Please provide the following: -Representation -Equation -Solution -Answer -Checking

asked by RR on March 9, 2013
64. ## Chemistry

A solution of NaCl and glucose gives a freezing point of -0.95°C. It contains 140 mOsmol glucose/L. Give concentration of NaCl in milliosmoles per liter and molarity. Thanks

asked by freelance on May 18, 2013
65. ## AP Chemistry

If a saturated solution of Potassium Chlorate at 80 degrees celsius cools to room temperature (25 degrees celsius), how many grams of crystals form?

asked by Alexandra on December 31, 2014
66. ## Chemistry

Calculate the mass of calcium phosphate that forms when 5.50 x 10 -2 mol of solid calcium chlorate is dissolved in 600.0 mL of 1.00 x 10 -2 M lithium phosphate solution.

asked by Bella on February 21, 2012
67. ## CHEMISTRY

If a pinch of flour is placed in water, does it form a coarse suspension, colloidal dispersion, or true solution? What about pepper? I thought both would be a coarse suspension

asked by KATIE on March 7, 2010
68. ## Chemistry

How many electrons are transferred in the reaction of hydrogen peroxide with iron (II) ion in acidic solution to form iron (III) ion and water?

asked by Stefany on July 2, 2008
69. ## Chemistry

What concentration of aqueous CaCl2 solution freezes at -10.2ºC? The freezing point of pure water is 0.0ºC and Kf of pure water is -1.86ºC/m. A. 5.48 m B. 11.0 m C. 1.83 m D. 6.12 m E. 2.74 m

asked by Michelle on August 21, 2010
70. ## Chemistry

What is the percent by weight of a solution prepared by dissolving 25 g of NaCl in 150 g of water? What is the volume of water in a 1 L bottle of 37% rubbing alcohol by volume?

asked by Hannah on April 15, 2012
71. ## Chemistry

When a solution of a certain gadolinium salt is electrolyzed with a current of 1.0 A for 2.0 h, 0.025 mol of Gd metal forms. Calculate the charge on the gadolinium ion in the salt.

asked by Durbin23 on May 7, 2017
72. ## science

out of following solution which possesses lowest osmotic pressure,highest boiling point and highest frezzing point 1M KCl,1MNa3PO4 and 1M glucose.

asked by sunidhi on June 21, 2016
73. ## chemistry!

an aqueous solution of calcium chloride boils at 101.3 degrees Celsius. How many kilograms of calcium chloride were dissolved in 1000.0 g of the solvent??

asked by Ana on May 25, 2010
74. ## chemistry 101

A patient receives 2700mL of an IV solution containing 4g g of glucose per 100 mL .How much energy, in kilojoules, does the patient obtain from glucose, a carbohydrate? please help I keep getting the wrong answer

asked by k on September 4, 2014
75. ## Science(Chemistry)

Suppose that 23 mL of 0.6 M K2CrO4(aq) reacts with 13.7 mL of AgNO3(aq) completely. What mass of NaCl is needed to react completely with 38.5 mL of the same AgNO3 solution? Answer in units of g

asked by Joseph on April 18, 2013
76. ## chemistry

In the reaction of hydrogen peroxide with iron (II) ion in acidic solution to form iron (III) ion and water, the oxidizing agent is is it Fe?

asked by Judy on June 28, 2010
77. ## chemistry

Calculate the concentration of oxalate ion (C2O42−) in a 0.175 M solution of oxalic acid (C2H2O4). [For oxalic acid, Ka1 = 6.5 × 10−2, Ka2 = 6.1 × 10-5.]

asked by sarah on February 22, 2011
78. ## Chem

Calculate the pH of a solution composed of 155mL of 0.1 M acetic acid and 45 g of sodium acetate. The pKa of acetic acid is 4.76. MY ANSWER: pH = 4.76 + log(3.53M/0.1M) pH = 6.31

asked by Marisol on March 6, 2007
79. ## quadratic equations

The solution to a quadratic equation is x is equals to 3 plus or minus square root of 4 minus 8p all over 4 where p is the element of Q. Determine the value(s) of p that the roots of the equation are equal and non-real

asked by Andiswa on March 7, 2016
80. ## chemistry

How many grams of hydrogen can be prepared by treating 2.63 g of iron with 130.0 mL of 1.50 M sulfuric acid solution, to give iron(III) sulfate and hydrogen?

asked by sarah on September 30, 2012
81. ## Chemistry

Calculate the molecular mass of sulphur if 35 gram of sulphur dissolves in 100 gram of CS2 to produce a solution that has a boiling point of 49.48°C

asked by chala on November 14, 2017
82. ## Math - explanation

This is an example in the text book. Using vectors, demonstrate that the three points A(5, -1), B(-3,4) and C(13,-6) are collinear. Solution AB = (-8, 5) BC = (16, -10) Then BC = 2AB AB and BC have the opposite direction, so the points A, B, and C must be

asked by Anonymous on March 29, 2008
83. ## chem

How many electrons are transferred in the reaction of hydrogen peroxide with iron (II) ion in acidic solution to form iron (III) ion and water

asked by Anonymous on August 12, 2008
84. ## chemistry

calculate the mass/volume percent of a NaCl solution in which 127g of NaCl is dissolved in enough water to give a total volume of 2.69L.

asked by lima on October 16, 2013
85. ## Chemistry

What is the hydronium ion concentration in a 0.010M solution of carbonic acid, H2CO3? For carbonic acid, Ka1=4.2x10^-7 and Ka2=4.8x10^-11.

asked by C on March 19, 2013
86. ## Pre Cal

how would i find the degrees of cos x= 3/2 if (0

asked by Marie on February 25, 2007

What is the potential halfway between two point charges spaced 1 mm apart if q1=10 micro coulombs and q2= -5 micro coulombs? Attempt at solution: no idea but need to get this right our homework is graded

asked by bel on February 15, 2012
88. ## Chemistry

A 10 mL sample of 1.5 M Potassium Phosphate is placed in a 100 mL volumetric flask and diluted to the mark. What is the Molar concentration of Potassium ions in this diluted solution?

asked by Jo on April 11, 2013
89. ## Chemistry

What is the hydroxide ion concentration of a 0.370M oxalic acid, H2C2O4, solution? For oxalic acid, Ka1=5.6x10^-2 and Ka2=5.1x10^-5

asked by B on March 19, 2013
90. ## health

Pharmacist dilutes a vial containing 1gm of antibiotic with 10ml of water. The solution is then added to 100ml of d5w. What is the concentration, in mg/ml, of the antibiotic in the d5w?

asked by Arlene on August 16, 2011
91. ## Chemistry

An 0.0284 aqueous solution of lactic acid is found to be 6.7% ionized. Determine Ka for lactic acid. HC3H5O3 + H2O H3O^+ + C3H5O3^- Ka =? Thanks.

asked by Sev on August 10, 2009
92. ## chemistry

a buffer is made by mixing 0.1 moles of acetic acd a sodium acetate in 500 ml of solution. determine the pH of the buffer. (Ka for acetic acid - 1.8E-5)

asked by Tara on December 15, 2010
93. ## Honors Chemistry

I don't exactly understand this question -- can someone maybe explain it to me please? 6) Suppose you have an NaOH solution of unknown concentration. Name three possible substances that could be used in "known" solutions to titrate the NaOH solutions.

asked by Emily on February 23, 2010
94. ## chemistry

Determine the molarity of in an aqueous solution at equilibrium with air at normal atmospheric pressure. The volume percent of in air is 20.65 Under an pressure of 1.00 , 28.31 of dissolves in 1.00 at 25.

asked by sab on February 21, 2010
95. ## Gen Chem

Knowing the MW of salicylic acid (138.12g/mol), design a procedure to make 100mL of a 0.0050M salicylic acid solution.

asked by Scott on May 20, 2016
96. ## Chemistry College (Need to know!)

Am I Correct in assuming this? dH of solution = -dH of lattice enthalpy + dH of hydration E.g: dHsolution NaCl = -dHLE NaCl(s) + dHhyd Na+(g) + dHhyd Cl-(g) Units as kJmol-1

asked by Ben on June 11, 2009
97. ## chemistry

How many grams of calcium chloride would you dissolve in water to make a total .111 M calcium chloride solution with 200 mL final volume?

asked by fiath on July 13, 2010
98. ## Chemistry

A solution contains 0.0390 M Pb2 (aq) and 0.0390 M Sr2 (aq). If we add SO42–(aq), what will be the concentration of Pb2 (aq) when SrSO4(s) begins to precipitate? I am just completely lost on this one.

asked by John on April 5, 2016
99. ## chemistry

in what ratio 0.2M NaCl and 0.1M CaCl2 solutions are to be mixed so that in the resulting solution, the concentration of negative ions is 50% greater than the concentration of positive ions?

asked by jaimi on April 16, 2015
100. ## chemistry

If you add 5.0 mL of 0.50 M NaOH solution to 20.0 mL to Buffer C, what is the change in pH of the buffer? (where buffer C is 8.203 g sodium acetate with 100.0 mL of 1.0 M acetic acid) I have calculated the pH of buffer C to be 4.74. Now what? =\

asked by Chelsea on November 7, 2010