# 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 560
1. ## Algebra

I have a problem that reads as: -4x-2y=12 4x+8y=-24 And when solved the answer is (2,-2), but I checked the answer in the back and it says (6,-6) How does that WORK??

asked by Liz on August 18, 2015
2. ## physics

Nala does twice as much work as Mateo in the same amount of time. How much power does she have, compared to Mateo?

asked by ramon on January 24, 2018
3. ## rearrange this equation

Rearrange to make f the subject, showing your work step by step: hf = hcT / b

asked by AK on January 8, 2013
4. ## english

This new computer program makes printers work twice as fast computer is used how in this sentence.

asked by barbara on November 16, 2009
5. ## Math

Find the measure of the reference angle for 400 degrees. I did the work and got 40 degrees, is this right?

asked by Sophie on June 8, 2009
6. ## Finances in Healthcare

How does discounted cash flow valuation work? How does it differ from the other valuation methods?

asked by Jen on March 18, 2010
7. ## Maths

How can work out the IQR with listed Upper bound and Lower Bound Outliers?

asked by Cheryl on September 7, 2016
8. ## English

Is your house close to your work? ============ What is the part of speech of 'close' here? An adjective or an adverb?

asked by rfvv on November 25, 2015
9. ## English

1. I don't read the novel yet. 2. I cannot start to do the work yet. 3. I will not open the bottle yet. 4. I don't want to go there yet. ------------- Are they all grammatical?

asked by rfvv on April 18, 2014
10. ## math

41 hours and nine minutes times 31 days what's my answer per day how many hours do I work

asked by mari on October 15, 2015
11. ## physics

A 10-kg mass is moving at a speed of 4.0 m/s. How much work is required to stop the mass? A. 20 J B. 40 J C. 60 J D. 80 J E. 100 J

asked by dali on March 3, 2017

How much does it cost to hire someone to work at a school and inspect people that come on school campus?

asked by Star :) on April 28, 2009
13. ## College physics

How much work is done to move 1.8C of charge from the negative terminal to the positive terminal of a 1.5V battery?

asked by emoni on July 17, 2010
14. ## Calculus

How do you differentiate sin^2(cos t) My work: =2sin(cos)(cost)(-sint)

asked by Nora on July 14, 2016
15. ## Regent University

A point charge of 0.5 is brought to a point a in free space. How much work is required to do this?

asked by Joseph on August 2, 2015
16. ## Physics (work)

Calculate the work done on a cyclist if a braking force of 40 N [backward] slows the cyclist from 20 m/s to 15 m/s in 2.0 s.

asked by Yinka on October 24, 2018
17. ## math

evaluate the squared root of 13.2/0.33,do i work out the division first then find the square root??

asked by mika on April 9, 2008
18. ## sci

a car performs 40,000 j of work in 5 sec. what is the power of the car. what is the horsepower?

asked by Aj on November 16, 2012
19. ## Physics

crane lifts a 75 kg girder 8.85 m. How much work does the crane do lifting with an upward acceleration of 1.20 m/s ^2?

asked by tionne on November 13, 2012
20. ## physics

how much work (J) is done by friction when the mass is 150 kg and dragged for 10 m if the coefficient of sliding friction is .3?

asked by Jamie on February 4, 2013
21. ## Physics

A 0.168kg hockey puck slides at 11.4m/s. what is the work needed to stop the puck?

asked by Sheetal on February 23, 2012
22. ## physics 11

if you have the formula W=Fd, where W=work, F=force, and d=displacement, how do you find W if you don't have F, but you have a mass and displacement?

asked by sierra on January 11, 2011
23. ## bobpursley

ok thiis is my work for the next question. im i right? im not sure on the question where it asks: what is its acceleration? wouldnt it be 9.8m/s^2??? or im i wrong? h t t p : / / i 3 6 . t i n y p i c . c o m / 2 1 o u i y w . j p g

asked by Claudia on October 15, 2008
24. ## medical law and ethics

what is the legal relationship formed between when one person agrees to perform work for another person?

asked by pandasala on December 17, 2009
25. ## physics

What displacemtn at 70 degrees has an x-component of 450m? What is its y-component? I know the answers are 1.3 and 1.2... but don't know how to work it out?? PLEASE HELP!!

asked by Kim on February 3, 2010
26. ## 9th grade

I am having trouble trying to figure out how to work this problem: Determine if each relation is a function. 1. Relation: (-2,2),(3,2,),(4,-1),(5,-2) How do i do this???????

asked by NIki on March 2, 2010
27. ## فيزياء

A 8.4-kg block is lifted vertically 9.0 m at constant speed by a boy. The work done by the boy is about:

asked by Ahmad on November 23, 2016
28. ## Science

How is the work done to hoist the counterweight related to the potential energy of the counterweight at its specified height?

asked by faith on April 24, 2019
29. ## science

A Kid applies a force of 70 Newtons to a ball over 1.1 meters.How much work did he do on the ball?

asked by jasmine on October 11, 2011
30. ## Physics

how much work is required to extend an exercise spring by 15 cm if the spring constant k has the value of 800 N/m

asked by John on September 13, 2010
31. ## PRE CALCULUS

V = x(16-2x)(19-2x) = 175 ft³ Ok, thanks. Now I'm trying to multiply out and having some difficulty. I am getting 4x^3-70x^2+304x = 175 which I'm not sure how to work with

asked by Ash on September 6, 2009
32. ## AP Physics

Will an object weigh more at the equator or at the poles? What two effects are at work and do these effects oppose each other?

asked by Henry on October 1, 2009
33. ## Physics

An engine does 15kJ of work while rejecting 37 kJ to the cold reservoir. What is the efficiency of the engine?

asked by P on November 22, 2012
34. ## science

if the pitcher moved his arm 1.1 m while accelerating the ball, how much work did the pitcher do on the bat

asked by stephanie on November 18, 2014
35. ## EASY QUESTION IM DUMB

IF you try to lift a 2x10 plank by applying 25 N force but the plank does not move did you do any work?

36. ## physics

how much work is required to extend an exercise spring by 15 cm if the spring constant k has the value of 800 N/m

asked by jazmyn on September 14, 2010
37. ## math

2.If the largest of 7 consecutive integers is 25 what is the average of the 7 integers? A.24 B.22 C.21 D.20 E.16 I got E, this is my work: 7x+21/7=25 7x+21=175 -21 -21 7x=154 x=22

asked by Johnny on July 24, 2014
38. ## Physics

An engine does 15kJ of work while rejecting 37 kJ to the cold reservoir. What is the efficiency of the engine?

asked by B on November 23, 2012
39. ## Physics

When u type on a computer keyboard, do u do work on the computer keys? Pleasee explain

asked by Katherine :)) on June 13, 2013
40. ## Physics

A vector has magnitude 58.0 units and is inclined to the positive axis of x at 42.0°. Vector has magnitude 36.0 units and is inclined to the positive axis of x at 121°. Vector has magnitude 40.0 units and is inclined to the positive axis of x at 53.0°.

asked by Alex on February 7, 2015
41. ## science

100 ml of 0.02 M acetic acid (pKa= 4.76) is titrated with 0.02 N KOH. After adding some base to the acid solution, the observed pH is 2.76. At this pH degree of protonation is

asked by kavin on April 15, 2011
42. ## Chemistry

A phosphate buffer solution contain 0.08 M K2HPO4 and 0.12 M KH2PO4. pKa values for H3PO4 are 2, 6.8, and 12.2. Calculate the concentrations of a) H3PO4 b) H2PO4- c) HPO42- d) H+ e) OH- f) K+

asked by James Alonso on March 25, 2015
43. ## Chemistry

If 17.0 mL of 0.590 M CaCl2 are mixed with 46.6 mL of 0.480 M CaCl2, calculate the molarity of each ion in the final solution? Assume the volumes are additive.

asked by Pob on April 3, 2011
44. ## Chemistry

What are the boiling point of a solution prepared by dissolving 2.40g of biphenyl(C^12H^10) in 75.0g of benzene? The molecular weight of biphenyl is 154..

asked by Anonymous on February 29, 2012
45. ## Chemistry Help Please!!

How can you precipitate BaCrO4(s) from a solution of barium nitrate and potassium dichromate? I don't get it.. it's a question from a lab we did on chromate-dichromate equilibrium.

asked by Chem Student on March 5, 2012
46. ## Chemistry

A solution has a pH of 3.90. What is the hydroxide ion concentration? I know that I need to find H30+ first but my teacher doesn't allow calculators on the test. So how would I find the answer WITHOUT a calculator?

asked by Chels on November 15, 2012
47. ## Chemistry

How many grams of sucrose (C12H22O11) must be dissolved in 200 g water to make a solution in which the mole fraction of sucrose is 0.2? Answer in units of g.

asked by Mike on October 11, 2010
48. ## Chemistry - Solubility Equilibria

Calculate the concentration (in M) of Tl^+ when TlI just begins to precipitate from a solution that is 0.0315 M in I^−. (Ksp = 5.54 ✕ 10^−8) Do I just set up an ICE table for this? So it would be 5.54X10^-8 = (.0315+x)x?

asked by Jamie on March 29, 2018
49. ## Chemistry

What are the boiling point of a solution prepared by dissolving 2.40g of biphenyl(C^12H^10) in 75.0g of benzene? The molecular weight of biphenyl is 154..

asked by Anonymous on February 29, 2012
50. ## Chemistry

Calculate the concentration of H+ ions of an aqueous solution of nitrous acid ( HNO2) to 0.02 mol/L knowing that the degree of ionization of acid is 3%

asked by Maria on January 20, 2016

why can't gravimetric analysis be used to determine the concentration of sodium nitrate (NaNO) in a solution? I think the answer is because NaNO dissolves in water. Am I correct

asked by Morgan on December 2, 2014
52. ## chemestry

H3PO4 is a tribasic acid and one of its salt is NaH2PO4.what volume of 1M NaOH solution should be added to 12g of NaH2PO4 to convert it into Na3PO4?

asked by alok on June 3, 2015
53. ## math college

Find the perimeter and area of a right triangle if the shortest side is 16 in. and the longest side is 34 in. Include correct units with each part of your solution.

asked by calvin on August 9, 2011
54. ## Chemistry

21.46 mL of Iodine I2 was standards with 0.1004 g sample of ascorbic acid. At the blue starch end point, what is the molarity of the iodine I2 solution?

asked by Pierre on April 18, 2010
55. ## Chemistry

Balance the following equation for a half reaction that occurs in acidic solution. Use e– as the symbol for an electron. Mo^3+ -> MoO2^2+ Is the answer 2O+2Mo^3+ -> MOO2^2++3e^-?

asked by Anonymous on December 3, 2012
56. ## SCIENCE(CHEMISTRY)

calculate the mass of silver deposited when a current of 2.6a is passed through a solution of a silver salt for 70mins ag=108,1 faraday 96500

asked by MIRACLE IWUNZE on March 14, 2015
57. ## chemistry

If 180.0 mL of 0.270 M NaOH are mixed with 230.0 mL of 0.500 M NaOH, what is the molarity of the final solution? Assume the volumes are additive.

asked by jade on February 27, 2012
58. ## math

We did this qs in class so we change the equation into the vertex form Here is the solution. Y=3x^2+30x+41 y=3(x^2+10x)+41 Y=(x^2+10x+25-25)+41 Y=3(x+5)^2-34 I understand everything expected I don't know how we get -34, can you explain please?

asked by Ayane on September 21, 2014
59. ## Chemistry 101

Solumedrol 1.5 mg per KG of body weight is ordered for a child weighing 2.0 pounds. Solumedrol is available as 75 mg / mL solution. How many mL should the nurse administer? Use dimensional analysis..

asked by Lilly on January 19, 2016
60. ## Chemistry

The boiling point elevation of a solution consisting of 2.92 g of a nonvolatile solute in 82.4 g of benzene is 1.077 oC. What is the molecular weight of the unknown solute?

asked by Jacqueline on October 27, 2008
61. ## Chemistry

Determine the concentration of H + ions from an aqueous solution of nitrous acid (HNO2) 0.02 mol / L, knowing the degree of ionization of the acid is 3%

asked by Shania on January 29, 2016
62. ## Chemistry

What is the mass of sodium nitrate NaNO3 that you would need to add to 250 g of water in order to prepare a solution that is 0.200 molal in NaNO3?

asked by Mike on January 30, 2014
63. ## Chemistry

Sodium sulfate is slowly added to a solution containing 0.0500 M Ca2 (aq) and 0.0370 M Ag (aq). What will be the concentration of Ca2 (aq) when Ag2SO4(s) begins to precipitate?

asked by NADIA on February 4, 2014
64. ## Math

Triangle LMN hes vertices at L(-4,-3), M(2,5), and N(-13,10). If the distance from point P(x,-2) to L equals the distance from P to M, what is the value of x? Could you be so nice and help me please. I tried so hard but I couldn't find the same solution

asked by Gabi on April 14, 2011
65. ## math

State different situations that do not involve money in which a formula like the one for compound interest is used. In each case, state a related problem and write its solution.

asked by Mike on January 18, 2010
66. ## chemistry

In a calorimetry experiment, 2.14 g of NH4Cl is dissolved in 100.0 mL of water. The temperature drops by 1.43°C. Calculate the molar heat of solution for NH4Cl.

asked by Anonymous on December 6, 2016
67. ## Chemistry

A 1.1% (w/w) solution of cocaine hydrochloride (molar mass 339.81 g/mol) in water. Calculate the molal concentration. Is it 0.0297 mol/kg?

asked by Student on February 22, 2016
68. ## Chemistry

An excess of zinc is added to 125 mL of 0.100 M HCl solution, What mass of zinc chloride is formed? Zn + 2HCl ----> ZnCl2 + H2

asked by Ana on April 29, 2010
69. ## Math

An explicit solution of a differential equation is: a) a simpler equation b) a real number c) a function on some domain d) an approximation e) a linear relation

asked by Rose on February 2, 2016
70. ## Chemistry

Calculate the mass (in mg) of KCN needed to make 500. mL of aqueous KCN solution with a pH of 10.00. The Ka of HCN = 5.0 x 10-10. I got the answer 7.8 mg but it's wrong. Can someone please explain how to do it?

asked by Nat on July 9, 2013
71. ## 9th grade

at 30degrees celcius, 80 grams of potassium bromide is dissolved in 100 grams of water. is this solution unsaturated, saturated, or supersaturated.

asked by kim on November 24, 2008
72. ## Chemistry

Name two organic compounds that cannot be extracted effectively from an aqueous solution by means of an immiscible organic solvent such as diethyl ether or cyclohexane

asked by Leesa on January 22, 2012
73. ## Chemistry :(

Calculate the molality, % percent composition by weight, and the mole fraction of HCl in an aqueous 12M HCl solution that has a density of 1.20 g?mL Please help :(

asked by Jillian on January 22, 2013
74. ## Chemistry

Can someone please explain this problem step by step. How would you prepare 1000.0ml of 0.600M NaOH solution starting from concentration of 1.000M

asked by Tasha on October 23, 2012
75. ## algebra

Please tell me IF there is a solution to this question (or is it misprinted). Can this be solved? Jenny has 11 coins in her pocket, all of which are either nickels or dimes. If the value of the coins is 754, how many of each type of coin does she have?

asked by Vee on January 31, 2013
76. ## math

find the perimeter and area of a right triangle if the shortest side is 20 mm. and the longest side is 52 mm. include correct units with each part in solution.

asked by jenna on July 3, 2011
77. ## Chem help please

What volume ( L ) of the solute methanol should be added with 4450 mL of the solvent water to make a solution that is 0.443 m methanol. i do not know how to approach this question

asked by henry on February 6, 2009
78. ## Chemistry

How would I calculate this? I have the answer because its from a previous test I just want to know how I would calculate it. How many grams of NaCI are contained in 350. mL of a 0.133 M solution of sodium chloride?

asked by Mary on June 30, 2013
79. ## Chemistry

If the methane contained in 3.50L of a saturated solution at 25 ∘C was extracted and placed under STP conditions, what volume would it occupy? Solubility of methane is 1.3 millimolar

asked by CG on September 10, 2014
80. ## Chemistry

What is the number of moles present in 24.0 mL of 0.500M solution of sodium chloride, NaCl? How many moles are there in 456 g of calcium fluoride, CaF2?

asked by Emma on May 27, 2010
81. ## Chem

In a 1.0x10^-6 M solution of HNO3(aq) at 25 degrees C, identify the relative molar amounts of species from most to least. HNO3 H3O+ H2O OH- NO3-

asked by Mer on February 20, 2014
82. ## Chemistry

How many grams of sucrose (C12H22O11) must be dissolved in 200 g water to make a solution in which the mole fraction of sucrose is 0.2? Answer in units of g.

83. ## chemistry

a 10.0mL vinegar sample was completely neutralized by 22.5mL 0.2M NaOH solution. calculate molarity and % of acetic acid in vinegar. please help

asked by confused on April 26, 2010
84. ## college

0.10 moles HCOOH (formic acid) and 0.02 moles HCOONa (sodium formate) are dissolved in a liter of water. what is the resulting pH solution?

asked by Anonymous on April 20, 2010
85. ## general chemistry

a solution of sulfuric acid was titrated with sodium hydroxide. if you took 23.7 mL of .025 M NaOH to reach the endpoint with a 5.0 mL sample of the acid what was its concentration?

asked by Lay on October 8, 2015
86. ## Crown poly

0.012moldm^3 of H2SO4 was prepared in 2 litre of volumetric glass.calcute (a)mass concentration. b.moles of H2SO4 used. C.density of solution

asked by Jummy on April 11, 2013
87. ## chemistry

How many milliliters of 16.0 M HNO3 stock solution wouuld be required to prepare 100.0mL of 3.00 M HNO3? Use the formula M1V1=M2V2

asked by missy on January 23, 2012
88. ## Chemistry

Calculate the number of millilitres of NH3(aq) solution (d = 0.986 g/ mL) contain 2.5 % by weight NH3 which will be required to precipitate iron as Fe(OH)3 in a 0.8 g sample that contains 50 % Fe2O3.

asked by Susan on July 26, 2014
89. ## Chemistry

I cannot figure out the equation and answer to the following. Can someone help please. A 25.0 mL solution of HCl has been spilled. It took 21.8 mL of saturated 2.5 M NaOH to neutralise the acid. What was the molar concentration of the acid?

asked by Campbell on August 28, 2013
90. ## Statics

Calculate the deflection v at the free end, B, for the beams shown below. Both beams have the same rectangular cross section. Give your solution in terms of P,L,E and I.

asked by Anjum on October 28, 2017
91. ## Chemistry

Calculate the new freezing point and the new boiling point of an aqueous solution that contains 40.5 g of Calcium Nitrate dissolved in 225 grams of water.

asked by Anonymous on February 5, 2017
92. ## Chemistry

When 0.016 moles of aluminum sulfate are dissolved in enough water to make 477 milliliters of solution, what is the molarity of sulfate ions?

asked by Anonymous on September 8, 2013
93. ## General Chemistry

A 15.0 ml sample of unknown HCL04 solution requires titration with 25.3 ml of 1.200 M NaOH to reach equivalence point. what is the unknown concentration?

asked by MAX on December 14, 2010
94. ## Chemistry

A 500 mL buffer solution is 0.1 M benzoic acid and 0.10 M in sodium benzoate and has an initial pH of 4.19. What is the pH of the buffer upon addition of 0.010 mol of NaOH?

asked by Nevaeh on April 21, 2016
95. ## chemistry

Earl N. Meyer found that it took 26.54 mL of a 0.0100 M KOH solution to reach the equivalence point for the titration of 25.00 mL of HCL. What is the molarity of the HCL?

asked by Alisha on June 21, 2010
96. ## Chemistry

What is the molar concentration of silver ion in a solution containing 1.3 × 10–4 M CrO42–, saturated with Ag2CrO4? The Solubility Product Constant, Ksp for Ag2CrO4 is 9 × 10–12 (A) 1.3 × 10–16 (B) 7 × 10–16 (C) 9 × 10–12 (D) 2.6 × 10–4

asked by LT on April 15, 2008
97. ## Chemistry!!!

What is the solubility of MnS, in grams per liter, in a buffer solution that is 0.120 M HC2H3O2 - 0.490 M NaC2H3O2? For MnS, Kspa=3x10^7.

asked by John on April 13, 2012
98. ## pharmaceutical calculations

what is the %w/v concentration of a solution made by mixing 35 grams of the main ingredient in 500 grams of vehicle (specific gravity 1.2000)

asked by HHahahaha on November 16, 2015
99. ## Math

State different situations that do not involve money in which a formula like the one for compound interest is used. In each case, state a related problem and write its solution.

asked by Kai on November 13, 2010
100. ## chemistry

What volume of ethanol must be diluted with water to prepare 315 mL of 0.620 M solution? The density of ethanol is given as 0.789 g/mL. Answer in units of mL

asked by james on April 25, 2014