# 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 95
1. ## help immeditaly

you have 15 coins, nickels and dimes. d=the number of dimes. write a simplified expression in terms of d for the total amount cents that you have. show work and explain

asked by Anonymous on September 19, 2012
2. ## physics (mechanics)

find the constant force necessary to accelerate a car of mass 1000kg from 15m/s to 20m/s in 10s against resistance of 270N ? pls show work (answer is 770N just in case to check)

asked by sam on February 6, 2016
3. ## geometry

One thousand raffle tickets are sold for \$1.00 each. One grand prize of \$200 and two consolation prizes of \$50 each will be awarded. Jeremy purchases one ticket. Find his expected value. Show your work for full credit.

asked by angela on June 6, 2012
4. ## prefixs

**these words wont show the right def. when i type it in the dictonary search bar **but i do no u ladys can not do my work for 4 sure *prefixes* ante arch bi demi equi extra non omin ortho semi

asked by Niqua on October 2, 2008
5. ## MATH HELP ASAP

Find the area for the circle (use 3.14 for pi). Show your work. Round to the nearest tenth.the radius is 23yd I really need help i'm treble at this type of math and i'm gonna fail if I don't have this question rigT!! THANKS EVERY ONEEEE!!!!

asked by the girl that has no friends on March 2, 2016
6. ## Stats

1. If you were to receive \$3 for every time a 7 or 11 was rolled with two fair dice and lost \$1 for all the ther values, what is the expected value (mean) for you as a gambler in this experiment? (please show work so I know how to do it). 2. Going with the

asked by Kayla on April 28, 2013
7. ## chemistry

Calculate the Molecular Weight (MW) of a hydrocarbon as if 0.5813 g of this gas completely fills a 250.0 mL flask at a temperature of 24.4 C and pressure of 742.6 mmHg. Show all work and assume ideal behavior.

asked by Tori on August 28, 2012
8. ## math

6. A magician plays a game using a full deck of cards. This includes 4 each of aces, numbers 2-10, jacks,queens, and kings. What is the probability that an even numbered card will not be selected? please explain and show work.

asked by Johnny on July 2, 2014
9. ## Chemistry

Hi, my question is: "Classify each of the following as saturated, supersaturated, or unsaturated: KNO3 90g/100g at 82*C NaCl 36g/100g at 23*C KCl 35g/100g at 18*C NaNO3 90g/100g at 28*C How do I determine if they are saturated, supersaturated, or

asked by Waleed on June 11, 2006
10. ## Pre-algebra

Dwayne walks a total of 960 feet around 3 sides of a square city block. Which equation and solution show a correct way to find the perimeter, P, of the block?

asked by Leigha on October 24, 2014
11. ## Chemistry

The freezing point of a 0.10m solution of mercury(I) nitrate is approximately -0.27 degrees celsius. Show that these data suggest that the formula of the mercury(I) ion is Hg2 2+

asked by Amy on March 6, 2011
12. ## child development

If a child is unable to connect to others because her parents do not show her love and acceptance what would be the appropriate solution for this situation? A. Change adult expectations. B. Help the child get her needs met. C. Get outside help. D. Use

asked by bev on August 25, 2015

Use synthetic division to show that x is a solution of the third-degree polynomial equation, and use the result to factor the polynomial completely. List all the real zeros of the function. x^3 - 28x - 48 = 0 Value of x = -4 Please help!!Thank you

asked by Abbey on March 27, 2010
14. ## pre cal

Use synthetic division to show that x is a solution of the third-degree polynomial equation, and use the result to factor the polynomial completely. List all the real zeros of the function. x^3 - 28x - 48 = 0 Value of x = -4 Please help!!Thank you

asked by megan on September 17, 2010
15. ## chemistry

Why is an Fe3+ solution instead of an Fe2+ solution used in calibrating the spectrophotometer? Note: hydroxylamine hydroxide is added to the Fe3+ solution then 1,10 phenanthroline is added to the solution after the addition of hydroxylamine hydroxide.

asked by smiley on September 15, 2007
16. ## Algebra

Given a line containing the points(1,4), (2,7) and (3,10) determine that slope-intercept form of the equation, provide one additional point on this line, and graph the funtion. Start by putting the first point into point-slope form: y-y1=m(x-x1), so

asked by delmore on January 7, 2007
17. ## College Algebra

Use a system of equations to solve the problem. A rectangular picture frame has a perimeter of 2,200 centimeters and a width that is 300 centimeters less than its length. Find the area of the picture. _____ cm2

asked by Dee on December 12, 2013
18. ## Quantitative methods

Missouri Mineral Products (MMP) purchases two unprocessed ores from Bolivia Mining, which it uses in the production of various compounds. Its current needs are for 800 pounds of copper, 600 pounds of zinc, and 500 pounds of iron. The amount of each mineral

asked by Anonymous on August 20, 2012
19. ## Chemistry

If 200. mL of 2.00 M H3PO4 solution is added to 600. mL of 2.00 M NaOH solution, the resulting solution will be ____ molar in Na3PO4.

asked by Fran on October 4, 2011
20. ## Organic Chemistry

What volumes of 0.00250M salicylic acid solution and 0.1M ferric chloride solution would you need to make 50mL of a 0.00350M solution?

asked by Mike on May 20, 2016
21. ## Chemistry

A solution is prepared by dissolving 23.7 g of CaCl2 in 375 g of water. The density of the resulting solution is 1.05 g/mL. The concentration of Cl- in this solution is __________ M. can someone help me? how do i get to M?

asked by BenY on September 26, 2010
22. ## Chem

A particular household ammonia solution ( d= 0.97 ) is 6.8% NH3 by mass How many milliliters of this solution should be diluted with water to produce 600 ml of a solution pH= 11.65?

asked by Kyle on February 16, 2009
23. ## General Chemistry

find [H3O+] and [OH-] 1)a solution that is 5.8×10−2 M in [HBr] and 1.9×10−2M in [NO3]. 2)a solution that is 0.780% HNO3 by mass (Assume a density of 1.01 g/mL for the solution.)

asked by jv on October 10, 2012
24. ## chemistry

What is the molarity of a potassium hydroxide solution if 38.65 mL of the KOH solution is required to titrate 25.84 mL of 0.1982 M hydrochloric acid solution?

asked by Anonymous on November 10, 2010
25. ## Chemistry

You have a solution of 0.500 M NaCl. If you add an equal amount of water to this solution, doubling the volume, what is the concentration of this solution?

asked by Christina on October 15, 2017
26. ## chemistry

6.67 mL of 18.0 molar sulfuric acid solution was dissolved in enough water to make 500 mL of solution. The molarity of the diluted solution is

asked by Anonymous on October 31, 2011
27. ## CHEM HELP?!

A particular household ammonia solution (D= 0.97g/ml) is 6.8% by mass. How many milliliters of this solution should be diluted with water to produce 650 mL of a solution with pH= 11.65?

asked by i need help! on February 16, 2009
28. ## chemistry pls help

If 10.0 mL of 1.0M HCl is added to 90 mL water, what is he concentration of the new solution? What is the pH of this solution? If the solution is titrated by 0.500M Ca(OH)2, how much volume (ml) of NaOH necessary? Need help pls.

asked by Emmy on December 8, 2012
29. ## Math

Find all real number solutions to (cubed root 3x-8)-1=0 If there is more than one solution, separate them with commas. If there is no solution, answer as "No solution."

asked by Hannah on January 27, 2011
30. ## chem

if 14.66ml of a standard .2616M KOH solution reacts with 57.5ml of CH3COOH solution, what is the molarity of the acid solution?

asked by sara on September 9, 2014
31. ## AP Chemistry

If 252mL of 2.5molar HCl solution is added to 343 mL of 2.8 molar Ba(OH)2 solution, what will be the molarity of BaCl2 in the resulting solution?

asked by Anonymous on March 3, 2014
32. ## CHEM 102

A particular household ammonia solution (d=0.97 g/mL) is 6.8% NH3 by mass. How many mililiters of this solution should be diluted with water to produce 625mL of a solution with pH = 11.65.

asked by Calvin on October 3, 2011
33. ## chemistry

predict the pH of the solution obtained when a 1.0 M magnesium hydroxide solution is titrated with an equal amount of a 1.0 M solution of sodium chloride.

asked by Ash on March 29, 2010
34. ## science

A 0.1 M NaOH solution is used for holder 50, or ml of a 0.100 M solution of acetic acid. Calculate the pH of the solution after the addition of 50.0 ml of sodium hydroxide

asked by Anonymous on May 2, 2016
35. ## Chemistry lab

A solution contains 2.65g of anhydrous Na2O3 in 200cm³ of the solution. Calculate the concentration of the solution in g/dm³ given that (Na2CO3 = 106)

asked by Sandra on April 17, 2018
36. ## Chemistry

An unknown monoprotic weak acid, HA, has a molar mass of 65.0. A solution contains 2.20 g of HA dissolved 750. mL of solution. The solution has a pH of 2.200. What is the value of Ka for HA?

asked by Sue on April 27, 2010
37. ## chem

A solution is prepared by dissolving 75.0 grams of sucrose (C12H22O11) in enough water to produce 1.00L of solution. What is the molarity of this solution?

asked by antu on December 3, 2012
38. ## Chemistry

A 25.0 mL sample of a 0.100 M solution of aqueous trimethylamine is titrated with a 0.125 M solution of HCl. What is the pH of the solution after 10.0, 20.0, and 30.0 mL of acid have been added?

asked by Brooke on April 5, 2019
39. ## Chemistry- I NEED HELP!

A particular household ammonia solution (D= 0.97g/ml) is 6.8% by mass. How many milliliters of this solution should be diluted with water to produce 650 mL of a solution with pH= 11.65?

asked by Pokadot Shorts on February 23, 2009
40. ## chemistry

A particular household ammonia solution (d = 0.97 g/mL) is 6.8% NH3 by mass. How many milliliters of this solution should be diluted with water to produce 650 mL of a solution with pH = 11.50?

asked by anonymous on March 28, 2010
41. ## Chemistry

A 25-mL sample of 0.160M solution of NaOH is titrated with 17 mL of an unknown solution of H2SO4 What is the morality of the sulfuric acid solution.

asked by Angela on March 3, 2017
42. ## Chemistry

You have a .200M solution of NaCl. if you pipette 2.00 mL of the solution into a 25mL volumetric flask and dilute it to the mark, then what is the molarity of the new solution

asked by mikey on October 24, 2010
43. ## Algebra

A laboratory technician wishes to mix a 70% saline solutio and a 20% solution to prepare 500ml of a 40% solution. What amount of each solution should be used?

asked by Raquel on December 7, 2016
44. ## Chemistry

Calculate the amount of solute needed to make each of the solution: 225g of 10% (m/m) K2CO3 solution .50kg of a 18% (m/m) KOH solution

asked by Curlyqty on May 13, 2011
45. ## physics

A 1580 kg car is traveling with a speed of 15.0 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 50.0 m? Calculate the kinetic energy: E_{k} = 1/2 m v^2 Then use that The work performed by

asked by tom on November 13, 2006
46. ## maths steve reiny

Sqrt(x)^sqrt(x)=2 show solution step that all i need thanks

asked by Anonymous on November 2, 2016
47. ## Math

How would you solve this word problem in one variable inequality form? The maximum safe water temperature in a spa is 104 degrees. The water temperature in bill's spa is 102 degrees. The temperature is increased by, d, degrees. Write and solve an

asked by Jake on September 25, 2013
48. ## Mathematics

In an orthonormal system, you're given the following: Point P(1,2) Lina a=cartesian eqn:4x-3y+6=0 Line b=parametric eqns:x=-5+3& y=-& (real n°) Circle z=cartesian eqn:x²+y²-2x-3=0 (a)Calculate the angle between lines a an b (b)Calculate the coordinates

asked by Anonymous on May 18, 2008
49. ## Maths

In an orthonormal system, you're given the following: Point P(1,2) Lina a=cartesian eqn:4x-3y+6=0 Line b=parametric eqns:x=-5+3& y=-& (real n°) Circle z=cartesian eqn:x²+y²-2x-3=0 (a)Calculate the angle between lines a an b (b)Calculate the coordinates

asked by Anonymous on May 4, 2008
50. ## History

Please check my answers please. Thank you! 1. The U.S. economy is a free enterprise system. True* False 2. Work you do for pay is called a _____. service industry diverse workforce job* volunteer job 3. When there are many people seeking the same job, this

asked by Anonymous on September 7, 2016
51. ## Chemistry

The mass/volume percent of a sodium sulfate and water solution is 12.0% m/v. If the density of the solution 1.22 g/mL, what is the molarity of the solution?

asked by Laura on December 12, 2014
52. ## Chemistry

A solution is made by dissolving 18.9 g of HCl in enough water to make 716 mL of solution. Calculate the pH of the solution at 25 degrees C

asked by Kristen on December 5, 2012
53. ## Chemistry

What volume of a .500 M HCl solution is needed to neutralize each of the following: 10 ml of a .300 M NaOH solution 10 mL of a .200 M Ba(OH)2 solution

asked by Monty on March 8, 2011
54. ## Math

A pharmacy technician is making a 50% solution, how many mL of a 38% stock solution should be added to one pint of a 82% solution? ( just need to know how to set this problem up please)

asked by Rayne on September 25, 2015
55. ## Chem

A solution is prepared by adding of KOH to 1 liter of water. The resulting solution has an [OH] of 1*10 to the negative 3. What would be the pOH of this solution?

asked by Carla M on April 28, 2011
56. ## chemistry

What is the molarity of the following solutions? A. 0.96 g MgCl2 in 500 mL solution B. 9.33 g Na2S in 450 mL solution C. 2.48 g CaF2 in 375 mL solution

asked by justin on April 7, 2016
57. ## chemistry

What is the concentration of ammonia in a solution if 24.20 mL of a 0.1140 M solution of HCl are needed to titrate a 100.0 mL sample of the solution?

asked by Victoria on November 23, 2012
58. ## Chemistry

A particular household ammonia solution ( = 0.97 ) is 6.8% by mass.How many milliliters of this solution should be diluted with water to produce 650 of a solution with = 11.60?

asked by MMmm on February 23, 2009
59. ## chemistry

calculate the volume of mL of a 1.420 M NaOH solution required to titrate the following solution. 25.00 mL of a 1.500 M H3PO4 solution

asked by TROUBLED on October 11, 2011
60. ## Chemistry

a solution is prepared by dissolving 15.0 grams of ni(no3)2 in enough water to make 250 ml of solution what is the molarity of this solution

asked by Madison on February 24, 2016
61. ## Inorganic Chem

If you forget to add phenolphthalein solution to a vinegar solution(after adding NaOH solution), how might you salvage the titration?

asked by Robert on April 13, 2011
62. ## chemistry

What is the concentration of ammonia in a solution if 24.20 mL of a 0.1140 M solution of HCl are needed to titrate a 100.0 mL sample of the solution?

asked by Victoria on November 21, 2012
63. ## chemistry

It has a solution to 10% v/V that has a density of 1.3 g/mL and a total volume of 200 mL (a) that solute mass has the solution (B) expresses the concentration of the solution in% m/m

asked by william on September 9, 2017
64. ## chem

A solution is prepared by dissolving 15.0 g of pure HC2H3O2 and 15.0 g of NaC2H3O2 in 600 mL of solution (the final volume). What is the pH of the solution?

asked by Jen on February 22, 2015
65. ## Survey of the sciences

When the hydronium ion comcentration of a solution equals 1 mole per liter, what is the pH of the solution? Is the solution acidic or basic?

asked by Stephanie on February 9, 2011
66. ## UNAM

if you add 15.ml of a 0.250M HCl solution to 50.0ml of a 0.125 MHCl solution what will be the molarity of the resulting solution

asked by Lelo on September 5, 2015
67. ## chemistry

How much of a 100mM solution do I need to add to a 2.5mM solution to make a solution with a final concentration of 10nM? Is there a formula for this? Please HELP!

asked by lisa on October 21, 2010
68. ## Chemistry

A solution is made by dissolving 18.9 g of HCl in enough water to make 716 mL of solution. Calculate the pH of the solution at 25 degrees C

asked by Kristen on December 5, 2012
69. ## Chem

Water is added to 25 ml of a .911 M KNO3 solution until the volume of solution is exactly 500ml. What is the concentration of the final solution.

asked by Jen on October 10, 2010
70. ## accounting

Andre has asked you to evaluate his business, Andre’s Hair Styling. Andre has five barbers working for him. (Andre is not one of them.) Each barber is paid \$9.90 per hour and works a 40-hour week and a 50-week year, regardless of the number of haircuts.

asked by Anonymous on August 16, 2009
71. ## 5th grade math word problems

bob started each work on the hour. one day he decided to start work twenty minutes early. he started work when his digital watch had consecutive numbers. what time did he start work

asked by Anonymous on November 13, 2012
72. ## 9th grade

Mr. Mist’s ramp broke so he tried to lift the his 150 Newton box of ungraded papers with a pulley system. Mr. Mist had to pull the rope in his system 3 meters. The papers were lifted into his car by the pulley system which lifted the box 1.5 meters,

asked by Kevin on November 14, 2009
73. ## Reposted - math - Ashley's question

L=length w=width ============ eqn 1 is 2L + 2w = 28 eqn 2 is w= (1/2)L+2 =========== solve for L and w. Post your work if you get stuck. http://www.jiskha.com/display.cgi?id=1169164168 Posted by Ashley on Thursday, January 18, 2007 at 6:49pm. John made a

asked by DrBob222 on January 19, 2007
74. ## help please(:

The neighborhood skateboard club is starting a fundraiser in order to buy more skateboards. They have decided to sell logo mugs. The Mugs on Mugs Company offers to supply mugs to the club for \$3.75 each plus a \$55 process and handling fee. The Punny-Cups

asked by Jordan on October 16, 2009
75. ## Algebra

The neighborhood skateboard club is starting a fundraiser in order to buy more skateboards. They have decided to sell logo mugs. The Mugs on Mugs Company offers to supply mugs to the club for \$3.75 each plus a \$55 process and handling fee. The Punny-Cups

asked by Jordan on October 16, 2009
76. ## Pre-Calculus

Find the values of x for which the line y=2x intersects the parabola y=(x-1)^2+1. So I set the equations equal to eachother, and solved for x using the quadratic formula. The solution I got was: x=3.41 and x=0.59. Could someone please check my work.

asked by Jon on September 20, 2010
77. ## statistics

Washington University banned smoking on the Hilltop campus starting in 2010. The student paper decides to do an opinion poll to see if current campus students/faculty/staff support the ban. Reporters are about to start asking a sample of 250 Hilltop people

asked by John on May 9, 2011
78. ## economics

Payroll Tax- You are an economic consultant to a city that just imposed a payroll tax of \$1 per hour of work. This payroll tax is paid by workers through a payroll deduction; for each hour of work, the employer deducts \$1 and sends the money to the city

asked by Anonymous on November 29, 2011
79. ## physics

A closed 2.0-L container holds 3.0 mol of an ideal gas. If 200 J of heat is added, what is the change in internal energy of the system? A. 300 J B. 150 J C. zero D. 100 J E. 200 J -Since there is no mention of work being done I thing the answer is 200J but

asked by Idali on April 4, 2017
80. ## Chem

Aqueous solutions of Zn+2 and Pb+2 both .0010M. Both form insoluble sulfides. Appx. what pH will allow maximum precipitation of one ion and leave the other in solution? Do I just use Ksp and the equations? If so what do I do next? See the selective

asked by Anonymous on May 7, 2007
81. ## CHEM

A particular household ammonia solution (d= 0.97g/mL) is 6.8% NH3 by mass. How many milliliters of this solution should be diluted with water to produce 650 mL of a solution with pH = 11.55?

asked by help!!! on February 16, 2009
82. ## Chemistry

Prepare M/20 oxalic acid solution.Using this solution, find molarity, strength, and percentage purity of the sodium hydroxide solution.

asked by Sara on June 13, 2016
83. ## Chemisrtry

What is the PH of a solution that results from mixing together equal volumes of a 0.150 M Solution of acetic acid and a 0.0750 M solution of sodium hydroxide?

asked by Ginger29 on March 30, 2010
84. ## chemistry

A solution contains 2 mEq/ml of KCL (Molecular weight 74.5). If a 20 ml ampule of this solution is diluted to 1 liter what is the percent strength of the resulting solution?

asked by Ann on February 21, 2013
85. ## chemistry

how do i know if the buffering capacity of a buffer solution is lost? Is that when after I add more of an acid or base to the solution that the pH eventually goes past + or - 1 of the original solution?

asked by laura on January 30, 2012
86. ## Chemistry

Calculate the molarity of a solution in which 0.75 moles of a solute are dissolved in 125g of solution (density of solution = 1.05g/mL). I don't even know where to begin.

asked by Lisa on April 29, 2008
87. ## chem

A particular household ammonia solution (d= 0.97g/mL) is 6.8% NH3 by mass. How many milliliters of this solution should be diluted with water to produce 650 mL of a solution with pH = 11.55?

asked by help!!! on February 17, 2009
88. ## chemistry

A solution is prepared by dissolving 23.7g of CaCl2 in 375.0g of water. The density of this solution is 1.05g/mL. determine the concentration (molarity) of Cl in solution.

asked by jim on March 14, 2011
89. ## Buffer

You have 500.0 mL of a buffer solution containing 0.30 M acetic acid (CH3COOH) and 0.20 M sodium acetate (CH3COONa). What will the pH of this solution be after the addition of 93 mL of 1.00 M NaOH solution?

asked by Nicole on April 11, 2011
90. ## science

A solution contains 2 mEq/mL of KCL (Molecular weight 74.5). If a 20 mL ampule of this solution is diluted to 1 liter what is the percent strenght of the resulting solution?

asked by Felix on January 14, 2013
91. ## chemistry

If a crystal added to an aqueous solution causes many particles to come out of the solution, the original solution was___? A: saturated. B: an emulsion. C: supersaturated. D: unsaturated

asked by kayla on August 4, 2008
92. ## Chemistry

What is the concentration of ammonia in a solution if 22.35mL of a 0.1145M solution of HCl are needed to titrate a 100.0mL sample of the solution?

asked by Amanda on November 8, 2010
93. ## Buffer Solution

You have 500.0 mL of a buffer solution containing 0.30 M acetic acid (CH3COOH) and 0.20 M sodium acetate (CH3COONa). What will the pH of this solution be after the addition of 93 mL of 1.00 M NaOH solution?

asked by Nicole on April 13, 2011
94. ## College chemistry

A buffered solution is made by adding 50.0 g NH4Cl to 1.00 L of a 0.70 M solution of NH3. Calculate the pH of the final solution. (Assume no volume change.)

asked by Nikita on March 10, 2010
95. ## AP Chemistry

The reaction of sodium oxide with water would form: 1. a neutral solution. 2. a basic solution. 3. an acidic solution. An explanation would be appreciated too!!

asked by Help!! on January 6, 2018
96. ## college cemistry

What is the pH for the solution made from 11.10 mL of 0.278 M HCl solution mixed with 70.90 mL of 0.1300 M ammonia solution ? Note that the pKa for NH4+ is 9.241 8.94 9.24 8.77 9.72 9.54

asked by Lucinda on May 27, 2010
97. ## chemistry

What is the pH for the solution made from 11.10 mL of 0.278 M HCl solution mixed with 70.90 mL of 0.1300 M ammonia solution ? Note that the pKa for NH4+ is 9.241 8.94 9.24 8.77 9.72 9.54

asked by Lucinda on May 27, 2010
98. ## Chemistry - buffers

Two burettes are filled with solutions: one with 0,1OM CH3COOH solution, second with 0,15M CH3COONa. How many milliliters each solution will need to make 20mL of solution, which pH=4.85

asked by Anonymous on March 26, 2012
99. ## Math

To conduct a scientific experiment, students need to mix 90 mL of a 3% acid solution. They have a 1% and a 10% soulution available. How many mL of each of the two solution must they combine to pruduce 90mL of the 3% solution?

asked by James on December 5, 2010
100. ## science

6g of impure NaOH was dissolved in 100ml of a solution.0.25molar solution of the base utilize 27.6ml of the solution containing 6g of trioxonitrate(5)acid.

asked by chm 101 on January 19, 2013