# 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

91,330 questions, page 613
1. ## Algebra 2

Find the A) Constant of Variation, B) the Equation of the Variation, and the C) the Solution Suppose B varies directly with C and inversely with D and the cube root of A. B = 4 when A = 27, C = 2, and D = 5. Find B when C = 3, A = 64, and D = 6.

asked by Nate on February 15, 2018
2. ## Pre-Calculus

Find a solution to the equation if possible. Give the answer in exact form and in decimal form rounded to three decimal places. 1=21tan(2x+2)-6

asked by Becky on January 28, 2013
3. ## Chemistry! URGENT!

Calculate the solubility, in molL―1, of lead sulfate, PbSO4, in a 0.0185 M solution of sodium sulfate, Na2SO4 . Ksp (PbSO4) = 1.6 x 10―8 I get 8 x 10^-9...but that is not right! Thanks!

asked by Critical on June 8, 2009
4. ## chemistry

what mass of lead (ii) trioxonitrate (v)will be required to yield, 22g of lead, (ii)chloride on the addition of excess potassium chloride solution

asked by favour on January 24, 2016
5. ## Science

how many mililiters of a 0.4 molar HCl solution are needed to react completely with 13 grams of zinc according to the following equation? Equation. 2 HCl + 1 Zn -----> 1 ZnCl2 + 1 H2

asked by Nicole on July 13, 2010
6. ## Chemistry

how many mililiters of a 0.4 molar HCl solution are needed to react completely with 13 grams of zinc according to the following equation? Equation. 2 HCl + 1 Zn -----> 1 ZnCl2 + 1 H2

asked by Nicole on July 13, 2010
7. ## Chemistry

Given Lead (||) oxide, nitric (V), sodium carbonate solution and water. Explain briefly how you can prepare Lead (||) Carbonate. Use equation where possible.

asked by STEPHEN on March 25, 2019
8. ## Chemistry

Determine the mass of CuSO4.5H20 needed to make 100.00mL of a .100M CuSO4.5H20 aqueous solution..

asked by Neha on February 2, 2012
9. ## MATH

hmm...i need help on this problem, anyone know how to o this? (if u can, put a step-by-step solution) i would really be grateful. the coordinates of two points are A(-2,6) and B(9,3). find the coordinates of the point C on the X-axis so that AC=BC

asked by jacob on December 7, 2008
10. ## chem

solution of 0.148 M sodium iodide for an experiment in lab, using a 500 mL volumetric flask. How much solid sodium iodide should you add

asked by Betty on November 16, 2015
11. ## Chemistry

A solution containing 10.50g aniline in 226g of benzene lowers the freezing point of benzene by 2.60°C. What is the molar mass of aniline? Thank you in advance

asked by Coach Tai on March 20, 2017
12. ## chemistry

suppose i want to find out how many mL of 1.0M AgNO3 are needed to provide 169.9g of pure AgNO3. what is step one in solving this problem? How many mL of solution are needed?

asked by lynda smith on November 18, 2009
13. ## Math

Write 27 as a number is base five. The number 1000^2 is what in base ten? The intersection of two disjoint sets is? Find the solution set of 8x = 32.

asked by John on January 5, 2011
14. ## math

student claims that the square root of -x equals three has no solution, since the square root of a negative number does not exist. Why is this argument wrong?

asked by brina on November 11, 2009
15. ## Chemistry 104

What is the percent ionization of a solution prepared by dissolving 0.0286 mol of chloroacetic acid in 1.60 L of water? For chloroacetic acid ,Ka=1.4x10^-3

asked by Chemistry on March 19, 2013
16. ## chemistry

how many grams of silver carbonate will precipitate when excess ammonium carbonate soln is added to 41.0 mL of a .518 M silver nitrate solution?

asked by JJ on March 12, 2016
17. ## Science

A jar contains 100 mL or a 4.0 M silver nitrate solution. What mass of solid copper would you add to bring all the silver out of the solutions as a solid?

asked by Cheyenne on April 25, 2016
18. ## Chemistry

In 2-3 sentences, describe how propanoic acid (C2H5COOH) and propanoate anion (C2H5COO-) can be used to make a buffer solution if the Ka of propanoic acid is 1.34 x 10-5.

asked by gavin on April 26, 2017
19. ## Physics

Verify that the formula u(t)=Acos(ωo*t+Φ) is a solution to the differential equation for the mass on a spring, by plugging this expression for u(t) directly into the differential equation: d^2u/dt^2+ωo^2*u=0.

asked by Anonymous on March 10, 2016
20. ## chemistry

A student stated that the solubility of KCL, at 20 degrees Celsius was 36 grams of KCL per 100 grams of solution. What is wrong with this statement?

asked by Anonymous on March 8, 2014
21. ## Chemistry

An aqueous solution of an unknown, monobasic weak base has an initial molarity of .176 M and a final[OH-] of .0000158 M. What is the Kb of the unknown base?

asked by Natalie on December 8, 2010
22. ## Chemistry

A single mole of AgNo3 weighs 169.88 grams. In order to make a 1M solution, how many grams of AgNo3 would need to be dissolved in 5oomL?

asked by Jazz on November 2, 2010
23. ## science

A certain quantity of electricity deposits 0.54grams of silver nitrate solution. What volume of H2 will be liberated by the same quantity of electricity at 27 ° C and 750 mm of Hg pressure

asked by Navneeta on August 26, 2015
24. ## Chemistry

Calculate the heat of solution of LiOH if addition of 25.0g of LiOH causes the temperature of 120.0ml of water to rise from 20.0 celcius to 29.0 celcius.

25. ## chemistry

A student stated that the solubility of KCl at 20 degrees Celsius was 36 grams of KCl per 100 grams of solution. What is wrong with this statement?

asked by Anonymous on March 8, 2014
26. ## Pre-Calculus

So I'm given a general equation and am expected to get the location on the unit circle, the period, and the general solution to it. The equation is (3cot^2)2x-1 = 0. I've gotten it down to (cot^2)2x = 1/3 but I have no clue what to do next. Please help!

asked by Mariam on January 21, 2018
27. ## Chemistry

What is the concentration of CO3^-2 in a 0.028M solution of carbonic acid, H2CO3? For carbonic acid, Ka1=4.2x10^-7 and Ka2=4.8x10^-11

asked by B on March 19, 2013
28. ## Chemistry

A sample of conc. nitric acid has a density of 1.41g/ml and contains 70% HNO3 by mass. What mass of HNO3 is present per L of solution? What is the molarity?

asked by Tree Frog on February 15, 2009
29. ## science

Stomach acid has a pH of about 2. What conclusion can you reach about the pH of an antacid solution that is used to neutralize excess stomach acid? Use Figure 8-3 to answer this question.

asked by Anonymous on December 9, 2009
30. ## Chemistry

Using household bleach and saltwater of the same molarity, describe the quantities of each that would me needed to make 30 ml of a solution that contained 50% of the hypochlorite in household bleach.

asked by Sara on February 22, 2015
31. ## Chemistry

Calculate the molality (m) of a 8280 g sample of a solution of the solute CH2Cl2 dissolved in the solvent (C2H5)2O if the sample contains 13.6 mol of CH2Cl2

32. ## Chemistry

What is the molarity of a 25.0% (v/v) aqueous isopropyl alcohol solution? the density of isopropyl alcohol ( C3H8O, molar mass 60.1g/mol) is 0.786g/ml

asked by Anonymous on March 2, 2014
33. ## Chemistry

What mass ( kg ) of the solvent H2O should be added with 0.1717 L of the solute formic acid to make a solution that is 0.626 m formic acid.

asked by Kobe on March 2, 2010
34. ## Chemistry

Calculate the number of moles of CuSO4 contained in 100 ml of 1mole CuSO4 solution. Also find the number of SO4 ~~ ions in it .?

35. ## Chemistry

What mass in grams of a 0.500 m(molal) solution of sodium acetate, CH3CO2Na, in water would you use to obtain 0.200mol of sodium acetate?

asked by Jessica on February 2, 2014
36. ## 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
37. ## 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
38. ## 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
39. ## 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
40. ## 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
41. ## 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
42. ## 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
43. ## 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
44. ## 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
45. ## 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
46. ## 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
47. ## 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
48. ## 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
49. ## 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
50. ## 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
51. ## 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
52. ## 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
53. ## 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
54. ## 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
55. ## 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
56. ## 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
57. ## history

What were the reasons our forefathers divided the government into the legislative, judicial, and executive branches? How are the three branches of U.S. government supposed to interact? Is the system successful? Why or why not? Are the branches balanced in

asked by troyer0269 on August 27, 2009
58. ## accounting for investments

Can someone check my answers. -For each of the following eight situations, select the best answer concerning accounting for investments: (A.) Increase the investment account. (B.) Decrease the investment account. (C.) Increase dividend revenue. (D.) No

asked by stumped on March 4, 2007
59. ## 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
60. ## 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
61. ## 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
62. ## science

the vapour pressure of pure liquid benzene and toluene are 160mm and 60 mm repectively. calculate the vapour pressure of an equimolar solution at the same temperature?

asked by priyanka on January 23, 2015
63. ## 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
64. ## 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
65. ## 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?

66. ## 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
67. ## chemistry

Given the equation Ag^+(aq) + 2NH3 (aq) -> [Ag(NH3)2]^+ (aq) kf= 2 x 10^7 determine the concentration of NH3(aq) that is required to dissolve 415 mg of AgCl(s) in 100.0 mL of solution. The Ksp of AgCl is 1.77× 10–10.

asked by jerome on April 3, 2015
68. ## 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
69. ## 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
70. ## 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

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
72. ## 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
73. ## 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
74. ## 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
75. ## 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
76. ## 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
77. ## 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

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
79. ## 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
80. ## 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
81. ## 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
82. ## 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
83. ## 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
84. ## 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
85. ## 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
86. ## inverse trig HELP PLEASE!!

Write the general solution to y = arcsin (0.6428). 40°±360°k 140°±360°k 220°±360°k 320°±360°k How do I find the right answer? I am like seriously stuck. I need help please.

87. ## 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
88. ## 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
89. ## 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
90. ## 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
91. ## 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
92. ## 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
93. ## chemistry

what volume of a 2.5m stock soltio of acetic acid (HC2H3O2) is required to prepare 100.0 mililiters of a 0.50m acetic acid solution?

asked by Anonymous on January 23, 2013
94. ## 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
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. ## 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
97. ## 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
98. ## 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
99. ## 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
100. ## 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