# 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 225
1. ## physics

What is a solution? What are the 2 parts of a solution

asked by keria on January 20, 2012
2. ## Mathematics

Am I right?? |a| -3/4 = -5/8 A) 1/8 or -1/8 B) 7/8 or -7/8 C) 1 3/8 or -1 3/8 D) No Solution** Wouldn't this just come out to to no solution..??

asked by Logan82 on October 17, 2017
3. ## science

How many ml of a 2% solution will 20 ml of a 10% solution make?

asked by jenny on September 11, 2012
4. ## Chem Help :(

What is the pH of a solution in which [H3O^+] = 6.8 x 10^-5 M? What is the pH of a solution in which [OH^-] = 2.5 x 10^-9 M?

asked by Tom on February 17, 2014
5. ## Math

3.) What is the solution to -33+m=10? 4.) what is the inverse to 38 5.) What is the solution to y+7=-9

asked by Caylee on September 21, 2015
6. ## algebra

continued 4c=3d+3 c=d-1 i got (6,7) x=1/2y+3 2x-y=6 i got no solution 8x+2y=13 4x+y=11 i got no solution 2x-y=-4 -3x+y=-9 i got (13,30) 3x-5y=11 x-3y=1 i got (7,2)

asked by Chris on November 18, 2008
7. ## chemistry

Flask A contains 100 milliliters of a solution with a pH of 5. After you add 100 milliliters of a solution from Flask B, the pH rises to 7. What was the pH of the solution in Flask B?

asked by Katy on September 5, 2014
8. ## Algebra

Match ABCDE with the solution set below A. {4/3, -4} B. {x|x > 4 or x < -4/5} C. No Solution D. {x| -11 < x < -7} E. All Real Numbers Solution set ABCDE|x + 9| < 2 ABCDE|5x - 8| > 12 ABCDE|3k + 4| = 8 ABCDE|x - 6| = -10 ABCDE|6x + 8| > -4

asked by Nick K. on June 7, 2009
9. ## accounting

lightning industries, located in northern New England, specializes in making Flash, a low alkaline wax that is used to protect and preserve skis. the company began producing at the beginning of the production process. during january, 15300 pounds were used

asked by ashley on April 22, 2008
10. ## chemistry

A 2.50-g sample of powdered zinc is added to 100.0 mL of a 2.00-M aqueous solution of hydrobromic acid in a calorimeter. The total heat capacity of the calorimeter and solution is 448 J/K. The observed increase in temperature is 21.1 K at a constant

asked by anon on October 28, 2016
11. ## Chemistry

Please help me answer this question; The goal of the recrystallization procedure is to obtain purified material with a maximized recovery. For each of the following, explain why this goal would be adversely affected. a) In the solution step, an

asked by Judy on February 8, 2010
12. ## AP Chemistry

A sample of potassium nitrate (49g) is dissolved in 101g of water at 100°C, with precautions taken to avoid evaporation of any water. The solution is cooled to 30°C and no precipitate is observed. The solution is ________. A. Hydrated B. Supersaturated

asked by Anonymous on November 15, 2009
13. ## Chemistry

A volume of 80.0mL of aqueous potassium hydroxide (KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What was the molarity of the KOH solution if 21.7mL of 1.50 M H2SO4 was needed? The equation is

asked by carley on February 24, 2014
14. ## Chemistry

How many grams of cesium chloride (CsCl) will be needed to make 750. mL of a 0.100 M CsCl aqueous solution? The formula mass of CsCl is 168.36 g/mol. Remember Molarity: M = (mol solute) / (L of solution) I need help solving this problem

asked by Mark on December 6, 2015
15. ## pcc

A volume of 40.0mL of aqueous potassium hydroxide (KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What was the molarity of the KOH solution if 21.7mL of 1.50 M H2SO4 was needed? The equation is

asked by jose on July 15, 2013
16. ## Physics

8. In an ultracentrifuge a solution is rotated with an angular speed of 3000 rev/sec at a radius of 10 cm. How large is the centripetal acceleration of each particle in the solution? Compare the centripetal force needed to hold a particle of mass 10-5 gm

asked by Pakilina on November 28, 2011
17. ## Veterinary Medicine Math calculations

I was so thankful to see this exact question answered in a different way but I still don't understand how I'm suppose to know how or what to do on the following question. I just seem to always forget something. Fifty milliliters of a solution of 50%

asked by Selina on February 6, 2017
18. ## physics

The system shown below consists of a block of mass M = 4.4 kg resting on a frictionless horizontal ledge. This block is attached to a string that passes over a pulley, and the other end of the string is attached to a hanging block of mass m = 1.9 kg. The

asked by Nick on March 16, 2012
19. ## Statistical significance

I did a biology experiment where I need to analyze the statistical significance of betweeen a data set. My experiment consisted of measuring the effects in photosynthesis and cellular respiration by exposing solutions with leaf discs to different light

asked by Catherine on October 28, 2011
20. ## Statistical significance

I did a biology experiment where I need to analyze the statistical significance of betweeen a data set. My experiment consisted of measuring the effects in photosynthesis and cellular respiration by exposing solutions with leaf discs to different light

asked by Catherine on October 27, 2011
21. ## Statistical significance

I did a biology experiment where I need to analyze the statistical significance of betweeen a data set. My experiment consisted of measuring the effects in photosynthesis and cellular respiration by exposing solutions with leaf discs to different light

asked by Catherine on October 27, 2011
22. ## science

suggest only one best method to avoid such a collision if a near earth asteroid of radius 50m strikes the earth surface?

asked by sam on December 21, 2009
23. ## science

what is the independen variable and the dependent variable for scientific method to how does air pressure in a tire save gas

asked by nic on September 29, 2009
24. ## Chemistry

If you do percent error and you come up with about 70% error, would this method of testing be considered valid? Why or why not? I don't understand an actual reason to use.

asked by babarra on November 29, 2016
25. ## Science

I have found other steps to the scientific method such as Control, Repeated Trials, and Revolt. Can you give me the definition of these three other steps??

asked by Valoy on August 9, 2008
26. ## math

Explain how you might create three parallel creases on a sheet of paper by using the method of paper folding.Sketch each step.

asked by Cherie on May 8, 2012
27. ## calculus

What analytic method steps are required to find the limit of cos x-1/2x^2 ? Limit greater than 0. Estimating -0.25 but stalled ....

asked by George on September 9, 2010
28. ## Basic Computer Science

Write a method in Java that takes two parameters. If the first parameter is equal to the second parameter multiply both and print the result. Thanks.

asked by Trish Goal on July 3, 2015
29. ## PhYs...alpha particles

how do u investigate how the range of alpha particles in air is affected by air pressure? Like..a method and what materials that wud be used.

asked by AllyKat on February 17, 2008
30. ## calculus

The region bounded by the given curves is rotated about the specified axis. Find the volume V of the resulting solid by any method. y = −x2 + 7x − 12, y = 0; about the x-axis

asked by maria on March 14, 2017
31. ## Philosophy

1. What is Parmenides’ argument that change is an illusion? Explain the way in which Parmenides is using the philosophical method. How do Plato and Aristotle respond?

asked by Dian on April 27, 2008
32. ## math-calculus 2

Consider the given curves to do the following. 64 y = x^3, y = 0, x = 4 Use the method of cylindrical shells to find the volume V generated by rotating the region bounded by the given curves about y = 1.

asked by Biff on June 21, 2013
33. ## life science

Investigation to determine whether expired air contains carbon dioxide how should state the method,step by step for the experiment

asked by john on August 3, 2015
34. ## math

use simplex method solbe LPP maximize Z=2x1+4x2+x3+x4 subject to x1+3x2+x4

asked by umesh on September 24, 2017
35. ## calculus

What analytic method steps are required to find the limit of cos x-1/2x^2 ? Limit greater than 0. Estimating -0.25 but stalled ....

asked by George on September 9, 2010
36. ## Life Sciences

Investigation to determine whether expired air contains carbon dioxide How should state the method, step by step for the experiment

asked by Ashanti on August 16, 2015
37. ## Math

Use Newton’s Method to approximate 3^(√7) to four decimal places. Use x1 = 2 as your seed. Round off intermediate iterates to five decimal place

asked by Jane on March 28, 2015
38. ## Math (Calculus)

Use the shell method to find the volume of the solid generated by revolving the plane region about the indicated line. y=4x-x^2, y=0, about the line x=5

asked by Sherman on May 8, 2014
39. ## calculus

Use Newton's method to approximate the indicated root of the equation correct to six decimal places. The positive root of 3sinx = x^2

asked by Dakota on November 10, 2011
40. ## math

use simplex method solbe LPP maximize Z=2x1+4x2+x3+x4 subject to x1+3x2+x4

asked by umesh on September 24, 2017
41. ## physics

calculate the acceleration of a 2000kg single -engine airplane just before takeoff when the thrust of the airplane ia 500N Using the G.U.E.S.S. method

asked by jim on November 2, 2009
42. ## Honors French 2

yeah..I have to write about a famous French person. What was Napoleon Boneparte's effect on the society and world at the time(monde du temps not sure what the right translation is) Thank you for using the Jiskha Homework Help Forum. First of all "monde du

asked by Tom on November 27, 2006
43. ## Math

I have trouble solving distance rate problems. I have a worksheet that I want to complete. I will post one question in hopes that someone can break it down so I am able to solve other distance rate problems. (Step by Step please.) Thank you. An aircraft

asked by Malinda on December 18, 2015
44. ## P.E.

I need to type an esay on my favorite athelete unfoetunately I don't have a favorite athelete can you show me famous atheletes What sport do you enjoy? First of all, be sure to spell the word correctly -- athlete. Then you'll be able to conduct a search to

asked by Sarah on October 12, 2006
45. ## math

Note: Enter your answer and show all the steps that you use to solve this problem in the space provided. A researcher tagged 40 giant turtles in 2008. In 2009, she returned and captured 50 turtles, 16 of which were tagged. In 2010, she returned again and

asked by no duh on May 20, 2019
46. ## chemistry

three student chemists measured 50.0 mL of 1.00 M NaOH in separate Styrofoam "coffee cup" calorimeters ( Part B). Brett added 50.0 mL of 1.10 M HCI to his solution of NaOH; Dale added 45.5 mL of 1.10 m HCL 9 eqaul moles) to his NaOH solution. Lyndsay added

asked by Daniel on January 17, 2011
47. ## MATH

Estimate the indicated derivative by any method y=1-x^2 ; estimate dy/dx , x=-1 I know I would use the f(x)= f(x+H)-(x)/h I am a bit overwhelmed with what to do next. Thanks John

asked by John on September 24, 2014
48. ## Science

Outline a step-by-step method for determining the density of a baseball. Please help with this too! Thanks

asked by Sarah on August 31, 2013
49. ## Calculus

From first principles (ie using the tangent slope method), find the slope of the following curves at the given value of x. f(x)=2x^2− 6x at x = 3

asked by Marc on April 14, 2016
50. ## Math

Determine whether ~ [ ~(p v ~ q) p v ~ q. Explain the method(s) you used to determine your answer i would use a truth table

asked by Prince on January 24, 2007
51. ## chemistry

7.How might this method of finding thickness of the aluminum be used in finding the size of the molecule?

asked by kylie on January 22, 2012
52. ## Accounting

When the net price method of recording purchases is used, the debit to purchases is for:

asked by Greg on August 10, 2008
53. ## math

use any method to simplify the complex fraction. y-(3y-5)/5/(14/10 + 7/2y) the fraction simplifies to ___.

asked by ashlyn on July 24, 2015
54. ## English

What does this question mean? What was your reading process or method for reading fiction before this unit?

asked by Emma on December 18, 2013
55. ## computers

What is the return type of a method that does not return a value? A. null B. void C. 0(zero) D. int

asked by Awesome on November 6, 2015
56. ## Chemistry

Can someone balance this equation using the half-reaction equation method? OF2 + I^- ----> F^- + I3^-

asked by Anonymous on February 21, 2008
57. ## chemistry

Following oxidation-reduction reaction by using the oxidation state method a) O2+H2O+Pb=Pb(OH)2

asked by mathew on October 5, 2014
58. ## Statistics

1. For the following exercise, complete the following by using the data sets below that provides the ages of the first seven presidents: a. Find the mean, median, and range for each of the two data sets. b. Find the standard deviation using the range rule

asked by Anonymous on July 7, 2010
59. ## Statistic

birth weight of infants: a health care professional wishes to estimate the birth weights of infants. the researcher desires to be 99% confident that the true mean is within 2.5 ounces of the sample mean. the standard deviation of infant birth wieghts is

asked by Telicia on September 1, 2012
60. ## Statistic

birth weight of infants: a health care professional wishes to estimate the birth weights of infants. the researcher desires to be 99% confident that the true mean is within 2.5 ounces of the sample mean. the standard deviation of infant birth wieghts is

asked by Anonymous on September 1, 2012
61. ## 10th grade English

This is my essay for the forum that I am attentding in few weeks time. The topic is shown below. Please make any corrections and check any awkward pharses A.S.A.P Thank you Can we balance Economic Growth and Environmental Conservation? Can we balance

asked by Andy on October 3, 2009
62. ## chem

(a) When a 4.75-g sample of solid ammonium nitrate dissolves in 60.0 g of water in a coffee-cup calorimeter (see figure), the temperature drops from 23.0‹C to 16.6‹C. Calculate ƒ¢H (in kJ/mol NH4NO3) for the solution process NH4NO3(s) ¨

asked by hannah on November 6, 2012
63. ## chemistry

a student was investigating the properties of a liquid L. He found that it turned phenolphthalein indicator red but when a piece of litmus paper was dipped into liquid L it turned blue. Which of these liquids could it be? a Aqueous ammonia b Lemon juice c

asked by vidya on February 18, 2016
64. ## chemistry

a 250.0 ml sample of an aqueous solution at 25 degrees celsius contains 35.8 mg of an unknown nonelectrolyte compound. If the solution has an osmotic pressure of 11.25 mmHg, what is the molar mass of the unknown compound? I know you need to have the answer

asked by Vic on September 30, 2012
65. ## General Chemistry.

The absorbance of a chlorophyll a standard solution in ethanol (density = 0.785 g/mL) is measured in a 1.3 cm cuvette or path length. The absorbance is 0.765 and the molar absorptivity coefficient is 86,300 M–1cm–1. The molecular weight for chlorophyll

asked by Shardae. on November 7, 2012
66. ## chemistry

A titration to standardize a HCl solution was performed by taking 50.0ml hydrochloric acid in a flask with a few drops of phenolphthalein indicator. The burette was filled with 0.15 molar NaOH. The initial reading of the burette was 0.50ml and the final

asked by martha on March 14, 2017
67. ## Analytic chemistry

A solution of HClO4 was standardized by dissolving 0.3745 g of primary standard grade HgO in a solution of KBr. The liberated OH- required 37.99 mL of the acid to be neutralized. Find the molarity(M) of HClO4. The given balanced chemical equation is: HgO +

asked by Smile on January 21, 2015
68. ## Chemistry!HELP

32.12mL of 10.0 mol/l potassium chromate solution is reacted with 120.0m of 2.00mol/l lead (II) nitrate solution. The balanced equation is; 2KCrO4(aq)+Pb(NO3)2(aq)==>2KNO3(aq)+Pb(CrO4)2(s) a. Determine the limiting reactant b. What is the maximum mass, in

asked by Lee L on November 20, 2017
69. ## SCIENCE

ALuminum can be determined gravimetricaly by the reaction with solution of 8-hydroxyquinoline (C9H7NO3).The net ionic equation . A mass of 0.1248g of Al(C9H6NO)3 WAS obtained by precipitating all of the the Al3+ from a solution prepared by dissolving

asked by NELLY on January 15, 2015
70. ## CHEMISTRY

During an experiment, a student adds 1.23 g of CaO to 200.0 mL of 0.500 M HCl. The student observes a temperature increase of 5.10 °C. Assuming the solution\'s final volume is 200.0 mL, the density if 1.00 g/mL, and the heat capacity is 4.184 J/(g·°C),

asked by imstupid on June 26, 2013
71. ## grammar help /;-;/ plz check

Which sentence contains an error in the use of end marks or commas? A.In the garden were rows, and rows of peas, beans, carrots and radishes. B.A wind, nervous colt was bucking and refusing to enter the trailer. C.The book, in my humble opinion, seemed a

asked by Leo on May 23, 2016
72. ## Intermediate Accounting

Prepare all the necessary journal entries to record the following transactions: 1. Sale of a 20 year convertible bond (dated March 1, 2001) with a face value of \$1,000,000, interest rate 5%. The bonds were sold 4 months later on June 30, 2001 at 98 plus

asked by cyndi on December 11, 2010
73. ## Law

Can anyone link me to a detailed list of possible careers in the legal system? I already have some of the basic knowledge down.

asked by Anonymous on January 21, 2007
74. ## Word problem

earth and cement block filling a box weighs 390mlb.the block weigh 2.4times as much as water and earth weighs 1.5times as much as water.water filling the box weighs 2000lb.find the weigh of the cement block.bl? plz help help help!!!! Show work

asked by Collins on January 6, 2016
75. ## Science

Dunbar, South Africa identify at least two serious environmental problems, such as soil degradation, air or water pollution, pesticide misuse, overpopulation, wildlife extinction or threatened biodiversity, and deforestation, that impact this region. What

asked by Daisy on November 3, 2007
76. ## johnson

Work these titration calculations: 1. A titration of 15.0 cm3 of household ammonia, NH3, required 38.57 cm3 of 0.78M HCl. Calculate the molarity of the ammonia. 2. What volume of 0.5M HNO3 is required to neutralize 25 cm3 of a 0.2M NaOH solution? 3.

asked by Lemun on June 18, 2012
77. ## Physics please check

A lunch tray is being held in one hand, as the drawing illustrates. The mass of the tray itself is 0.280 kg, and its center of gravity is located at its geometrical center. On the tray is a 1.00 kg plate of food and a 0.210 kg cup of coffee. Obtain the

asked by Mary on April 24, 2007
78. ## 12th Calculus

1. Explain why the function f(x)=(x^2-4)/(x-2) is not continous on [0,3]. what kind of discontinuity occurs? 2. use areas to show that integral sign with the upper limit of 3 and a lower limit of 0 (x^2-4/x-2)dx=10.5 3. use the area to show that intergral

asked by may on December 10, 2008
79. ## chemistry

Construct a galvanic (voltaic) cell from the half reactions shown below. Au3+ + 3 e- → Au (s) ξo= 1.420 V Br2 (l) + 2 e-→ 2 Br- (aq) ξo= 1.087 V Calculate the equilibrium constant (K) for this cell. Assume that the temperature is 298K. First,

asked by bekah on May 2, 2014
80. ## Discrete Math

Please help with this problem. Thanks a/ Show that for any real number x, if x>1 then |x^4|=< |23x^4 + 8x^2 + 4x| b/ Show that for any real number x, if x>1 then |23x^4 + 8x^2 + 4x| => |x^4| c/ Use the big Theta and big O-notations to express the results

asked by yengiang on April 29, 2011
81. ## Health

What is a physician specializing in female reproductive system problems? Physician specializing in cancer? What is a Physician specializing in urinary problems? What is a Physician specializing in allergies? What is a Physician Specializing in nervous

asked by Mack on September 12, 2007
82. ## Statistics Help Please

A bank is testing a new method for getting delinquent customers to pay their past-due credit card bills. The standard way was to send a letter (costing about \$0.45) asking the customer to pay. That worked 30% of the time. The bank wants to test a new

asked by Penny on November 4, 2013
83. ## chemistry

3. If 15.0 mL of a 1.5M HCl solution at 21.50C is mixed with 25.0mL of a 1.5M NaOH solution at 21.50C that is in a calorimeter, and the final mixed solution temperature rises to 28.50C, what is the ΔHrxn for this process? Assume that Ccalorimeter =

asked by Meredith on November 15, 2017
84. ## College Chemistry 104

Students are attempting to construct a battery in the laboratory that will light up a light bulb. Compare the following lists prepared by students and determine which student will not be able to successfully build a "battery" that will light up the bulb.

asked by Claire on May 10, 2013
85. ## math

Yesterday Lucy walked 2 hours and jogged 1/2 hour and covered 6.25 miles. Today she walked for 3 hours and jogged for 1 hour and covered 10.25 miles. Assuming a constant walking rate and a constant jogging rate, how fast did she walk and how fast did she

asked by help please:) on October 15, 2009
86. ## Chemistry

What is the molality of a glucose solution prepared by dissolving 18.0g of glucose, C6H12O6 in 125g of water? A)0.000794 B)0.144 C)0.699 D)0.794 Molality is the number of moles of solute per kilogram of solvent. Because the density of water at 25°C is

asked by CIndy on April 27, 2007
87. ## Geometry

1.Explain why we use the formula AB = |a - b| to find the distance of a segment. Include why you need to subtract and why you need to take the absolute value. The formula for finding vector AB is AB = b - a where a and b are the position vectors OA and OB

asked by Unknown on July 10, 2013
88. ## physic

3. I have two identical dust particles. They are spheres with diameters of 0.0001 meter (about the same as a hair). They have the same density as water so they each have a mass of 10-12 kg. If each dust particle goes through a discharge so that 2.40 „e

asked by sabrina on January 21, 2011
89. ## math

Jeremy enlarged a picture.The length of the original picture is 8cm and the width is 5cm.The length of the enlarged picture is 10cm and the width is 7cm. A.What percent is the 10cm length of the 8cm length? B.What is the area of each picture?By what

asked by Dj on September 28, 2015
90. ## Physics

A 26.0 kg block is connected to an empty 1.00 kg bucket by a cord running over a frictionless pulley. The coefficient of static friction between the table and the block is 0.490 and the coefficient of kinetic friction between the table and the block is

asked by Millie on November 18, 2011
91. ## chem 100

Super confusing question im not sure how to approach a. Determine the concentration of lead ion in solution (the molar solubility) if PbI2(s) is in equilibrium with water. Ksp = 9.8*10-9 b. From part a, it should be clear that if Pb2+(aq) and I-(aq) are

asked by Mall on May 21, 2015
92. ## Statistics

A bank is testing a new method for getting delinquent customers to pay their past-due credit card bills. The standard way was to send a letter (costing about \$0.45) asking the customer to pay. That worked 30% of the time. The bank wants to test a new

asked by Penny on November 2, 2013
93. ## Chemistry

An aqueus solution of sodium mitrate(NaNO3) contains 0.85 grams of sodium nitrate and its concentration is 0.1mol L^-1. What is the volume. in millilitres, of the sodium nitrate solution?

asked by Jeconiah on August 25, 2012
94. ## chemistry

A solution contains an unknown amount of dissolved magnesium. Addition of 5.34×10−2mol of Na2CO3 causes complete precipitation of all of the magnesium. What mass of magnesium was dissolved in the solution.

asked by bob on September 30, 2014
95. ## Chemistry

H2SO4 solution containing 200.1 g of H2SO4 in 0.3500 L OF solution has a density of 1.3294 g/ml.calculate (A) Mass%H2SO4(m/m) (B)mass%H2O(m/m) (C)Molarity (D)Molality

asked by Yeneta on September 1, 2012
96. ## chemistry

you dissolve x in 175g of water to make a saturated solution at 50 degrees celcius. if the solution is cooled to 10 degrees celcius, how many grams of x settle out? (x=15.0 at 50 degrees)

asked by steve on October 13, 2010
97. ## chemistry

When 7.50 grams of iodine (I2) is added to 48.7 grams of carbon tetrachloride (CCl4), the iodine dissolves and a solution is formed. The weight percent of the iodine in the solution is a) 13.3 % b) 15.6 % c) 60.7 % d) 2.96 % e) 86.0%

asked by jimmy on February 3, 2012
98. ## college algebra

Find all real solutions of the equation. (Enter your answers as a comma-separated list. If there is no real solution, enter NO REAL SOLUTION.) x4 + 27x = 0

asked by tara on September 5, 2013
99. ## Chemistry

A solution contains an unknown amount of dissolved magnesium. Addition of 3.38×10−2mol of Na2CO3 causes complete precipitation of all of the magnesium. What mass of magnesium was dissolved in this solution?

asked by Courtney on October 3, 2013
100. ## Chemistry

H2SO4 solution containing 200.1 g of H2SO4 in 0.3500 L OF solution has a density of 1.3294 g/ml.calculate (A) Mass%H2SO4(m/m) (B)mass%H2O(m/m) (C)Molarity (D)Molality

asked by Yeneta on September 1, 2012