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 658
1. Chemistry

What is the mole fraction of NaBr in an aqueous solution that contains 20.1% NaBr (weight/weight%)?

asked by Steve on April 7, 2016
2. chemistry

A chemist wants to make 5.5 L of a 0.250 M CaCl2 solution, what mass of CaCl2 (in g) should the chemist use?

asked by Lisa on November 20, 2010
3. Chemistry

A chemist wants to make 4.5 L of a 0.310 M CaCl2 solution what mass of CaCl2 (in g) should the chemist use

asked by Lisa on November 1, 2010
4. Chem

what mass of NaCl is contained in 24.88g of a 15% by mass solution of NaCl in water?

asked by Anonymous on October 13, 2014
5. chemistry

How many grams of sodium chloride do you need to prepare 250 mL of a 5.00%(w/v) sodium chloride solution

asked by NeeNee on March 10, 2011
6. chemistry

How many grams of NiI2 are there in 263 grams of an aqueous solution that is 33.5 % by weight NiI2.

asked by jb on August 21, 2014
7. Chemistry

How many grams of NaCl are present in a 300 grams salt solution containing 9% NaCl ?

asked by Angelica on November 6, 2013
8. Calculus

Consider the differential equation dy/dx = x^4(y - 2). Find the particular solution y = f(x) to the given differential equation with the initial condition f(0) = 0. Is this y=e^(x^5/5)+4?

asked by Anonymous on March 3, 2017
9. Chemistry

How many grams of ZnCl2 are there in 213 grams of an aqueous solution that is 17.7 % by weight ZnCl2.

asked by Ebony on May 4, 2017
10. Math

x is a partly constant and partly varies with y when y =3, x=7 and when y=6, x=9, find the relationship between x and y.Hence find x when y=4. solution?.

asked by Angel on December 24, 2018
11. chemistry

How many grams of NaOH are there in 187 grams of an aqueous solution that is 7.06 % by weight NaOH.

asked by jb on August 21, 2014
12. chemistry

how would i create a 100mL solution of 0.1N nitric acid using 6.25N nitric acid?

asked by lisa on February 26, 2008
13. CHEMITRY

what is solubility, in mol/L, of MgCO3 in a 0.65 mol/L solution of MgCL2 if the ksp of MgCO3 is 2.5*10^-5

asked by NICOLE on May 7, 2012
14. chemistry

What is the percent by volume of isopropyl alcohol in a solution that contains 24 mL of isopropyl alcohol in 1.1 L of water? this the other one i need help with and thanks for the last help

asked by Anonymous on February 10, 2011
15. La Salle

How many grams of sodium chloride do you need to prepare 250 mL of a 5.00% (w/v) sodium chloride solution?

asked by Jackie on October 25, 2010
16. character education

A solution should consider higher values more than lower values. True/False True

asked by Bri on November 10, 2017
17. Biology

What can you say about the amount of hydrogen ions relative to the amount of hydroxide ions in a solution that has a pH of 2?

asked by John on September 9, 2010
18. Biology

What can you say about the amount of hydrogen ions relative to the amount of hydroxide ions in a solution that has a pH of 2?

asked by Malcolm on November 22, 2015
19. chemistry

what volume of a 0.20M potassium sulfate solution contains 57g potassium sulfate?

asked by jen on November 12, 2016
20. Science

What is the approximate temperature of the solution after 1.75 if it is 19 degree celcius at 1.5 and 24 degree celcius at 2.0 minute? Can anyone say how to do it exactly?

asked by Alisha on September 7, 2008
21. Chemistry

Describe how you could make 5 mL of 2M potassium hydroxide solution if you have potassium hydroxide pellets available.

asked by Wanda on November 8, 2011
22. Science

How many grams of sucrose are dissolved in 400 grams of a 12% ogueaus solution of sucrose?

asked by Araceli on July 7, 2014
23. Chemistry

50.0mL of 0.01M Ba(OH)2 is added to 150.0mL of 0.01M HNO3. What is the new pH of the solution?

asked by Zac on April 29, 2012
24. Chemistry

The measured pH of a 0.100M solution of NH3(aq) at 25C is 11.12. Calculate Kb for Nh3(aq)at 25C.

asked by Anonymous on May 1, 2017
25. chemistry

Describe how to prepare a 1M solution of sodium hydroxide from concentrated sodium hydroxide (17.6 M)

asked by Jay on February 8, 2010

why does the equation x^2=-9 has no real solution? This I can't figure out. why does the equation x^2 = 9 has two solutions? Is it because it satisfied by both 3 and -3 so it has two solutions.

asked by Wendy Q on May 3, 2011
27. Algebra

What is the solution to a two-variable equation? What are the ways to represent solutions to a two-variable equation?

asked by Spetle on October 26, 2016
28. math

how many real number solutions does the equation have y = -4x^2 + 7x - 8 no solutions (is it this one) one solution two solutions infinitely many solutions

asked by nisa on March 28, 2014
29. Chemistry

To make 250 ml of a 5%(w/v) calcium carbonate solution, how many grams of calcium carbonate will I need?

asked by Chris on November 29, 2014
30. math

7​. If 60 ml of water contains 12% of chlorine, how much water must be added in order to create a 8% chlorine solution?

asked by ppp on April 15, 2017
31. Chemistry

The pH of a 0.002 50 mol/L solution of benzoic acid is 3.65. Calculate the Ka for benzoic acid.

asked by Maria on December 20, 2011
32. Algebra

What is the solution to a two-variable equation? What are the ways to represent solutions to two-variable equation?

asked by Spetle on October 26, 2016
33. Chemistry

Calculate the S(univ) for the following phase change at 25 deg celcius. The boiling point of heptane is 98.0 Celcius and has a Delta Hvap= +21.6kj/mol. C7H16(l)--> C7H16(g) Delta S= +79.0j/k I know that the equation is Delta Suniv= DSsys + DSsurr PLEASE

asked by Hank on November 23, 2014
34. physics

An amusement park ride consists of a large vertical cylinder that spins around its axis fast enough such that any person inside is held up against the wall when the floor drops away. The coefficient of static friction between person and wall is µs, and

asked by Jessi on February 17, 2009
35. algebra

Your research the average cost of whole milk for several years to look for trends the table shows your data what is the equation for a line of best fit how much would you expect to pay for a gallon of milk in the year 2023 Year, 1998, 2000, 2002, 2004,

asked by snow on March 15, 2014
36. Physics

If an object is thrown in an upward direction from the top of a building 1.60 x 102 ft. high at an initial velocity of 21.82 mi/h, what is its final velocity when it hits the ground? (Disregard wind resistance. Round answer to nearest whole number and do

asked by Alexis on November 7, 2012
37. tempe

An April 15, 2002 report in Time Magazine stated that the average age for women to marry in the United States is now 24.5 years of age. If the standard deviation is assumed to be 4.1 years, find the probability that a random sample of 32 U.S. women would

asked by Paul on March 5, 2013
38. physics

A chain of length l and mass ë per unit length is fully open and is held on a high frictionless table with y1 of its length hanging from the side of the table as shown in figure. When released, it starts slipping off the table. By calculating the speed of

asked by anil on October 29, 2010
39. math

What is the least number of place-value blocks you need to show 4,200? The greatest? well, here is what the blocks are: 4 2 0 0 thousand hundreds tens ones does this help at all? I'm actually trying to figure this out so I can help my daughter. I

asked by melissa on September 28, 2006
40. Statistics

An April 15, 2002 report in Time Magazine stated that the average age for women to marry in the United States is now 24.5 years of age. If the standard deviation is assumed to be 4.1 years, find the probability that a random sample of 32 U.S. women would

asked by Paul on March 5, 2013
41. Trig application

A man is holding a gun 4 feet above the ground and fires into an open field. The bullet has an initial velocity of 300 feet per second and an initial angle of 30°. Find the range (the horizontal distance traveled before hitting the ground ) and the

asked by Jane on March 4, 2016
42. calc (confused)

A wedge is cut from a right circular cylinder of radius r by two planes, one perpendicular to the axis of the cylinder and the other making an angle (beta) with the first. Find the volume of the wedge by slicing perpendicular to the y-axis. Please show all

asked by beam on May 6, 2015
43. math

Estimate the amount of gasoline consumed by automobiles in the USA each year (assume population of USA is 300 million). If the gasoline consumed annually can be stored in a single tank that is 0.1 km by 0.1 km at the base, what is the height of the tank?

asked by ra on November 23, 2008
44. math

you roll a number cube. what are the odds in favor of rolling a 1 or a 5?thanks. There are 6 sides of a cube. You want one of 2 numbers to show up. So it's 2/6 chance....or 1/3 Matt I assume that you are talking about a die (Singular for "dice"), it has a

asked by dillon on April 13, 2007
45. Physics

A pitcher hurls a 0.25kg ball around a vertical circular path of radius 0.6 m, applying a tangential force of 30N, before releasing it at the bottom of the circle (underhand pitch). If the speed of the ball at the top of the circle was been 15 m/s, what

asked by Anonymous on October 24, 2016
46. Chemistry II (College)

How would I go about solving this problem? Can someone show me an equation that can be used? The decomposition of dimethyl ether at 504°C is a first-order reaction with a half-life of 27 min. (CH3)2O(g) CH4(g) + H2(g) + CO(g) What will be the total gas

asked by Tim on March 12, 2010
47. math

Suburban Population. The following charts show the populations for two suburbs from 1980 to 1990, where x = 0 correspond to 1980, x = 2 correspond to 1982, and so on. Year x Suburb 1 y Year x Suburb 2 y 0 12,690 0 23,112 2 12,071 2 23,893 4 13,463 4 24,674

asked by grace on July 17, 2011
48. Chemistry II (College)

How would I go about solving this problem? Can someone show me an equation that can be used? The decomposition of dimethyl ether at 504°C is a first-order reaction with a half-life of 27 min. (CH3)2O(g) CH4(g) + H2(g) + CO(g) What will be the total gas

asked by Tim on March 12, 2010
49. math

Can someone please explain this problem to me: I have to use integrals to find volumes with known cross sections but i just don't understand. I have to do a lot of examples for homework like this so can someone show me so I can do my other problems?

asked by summer on April 7, 2010
50. Check my work

Danielle likes to work alone and has strong math and analysis skills. She like the challenges of the outdoors and regularly records her observations. For which kind of job would she be most suited? Select two apply. a. Botanist b. Biology teacher**** c.

asked by Sid.V on September 18, 2018
51. history

All of the following statements are true about the Works Progress Administration EXCEPT: A.despite its good intentions, it provided few jobs for Americans B.the organization developed work projects for artists, musicians, and writers. C.it laid much of the

asked by sharice on March 15, 2011
52. lit

What do you think Oedipus Rex and A Raisin in the Sun imply about Sophocles’ and Lorraine Hansberry’s cultural identity?" If you go to http://www.sparknotes.com/lit and read the Context and Themes ... sections for each work, you'll find plenty of ideas

asked by stacy on February 1, 2007
53. Social Studies

What do the Samriddhi women plan to do with money they receive from future loans? A.Start a fruit-tree plantation B.Buy vans and trucks to mover their products to big cities. C. Invest in the indian stock market. D. Hire businessmen who can help them

asked by Senpai were all gunna die on April 14, 2016
54. HISTORY HELP plsssssssss

The Black Death contributed to the growth of the arts by decimating the population, leaving the survivors wealthier giving artists a universal subject to depict strengthening the control of the Church forcing people to spend more time indoors, where they

asked by Oscar on September 13, 2016
55. grammar

In which sentence does the verb correctly agree with the subject? 1) A copy of Moby Dick and a magazine has disappered form my room. 2) Peggy or Phyllis dirve me to Florida every winter. 3) Les and Miranda is late for work today. 4) Not only the muffler

asked by pamelA on February 3, 2009
56. Career

Please check my answer In which of the following would a person works as a business administrator be interested? 2 points A. convincing someone to purchase a project** B planning employee work schedules C. typing memos and letters D. writing facts,

asked by JACK on September 14, 2018
57. health

Describe the possible barriers to entry and exit for: (a) a physician wanting to establish a solo practice office in internal medicine, (b) a company offering a health club facility in the same building where employees work, and (c) a tertiary hospital

asked by Karol on May 7, 2011
58. economic 100

you have been hire as a staffing agency representative for a company that places individuals in temporary and permanent work positions. Explain the effect that the current unemployment rate may have on your clientele in the next couple of months and how it

asked by sue on August 14, 2013
59. Misc.

Our English teacher has been helping us work on a contest for the past month. She has bought us pizza, brought food for us, and even allowed us to miss her class. She has really been a great help and we want to give her a present... Any Ideas? She likes to

asked by Anonymous on March 14, 2008

Describe the possible barriers to entry and exit for: (2) physician wanting to establish a solo practice office in internal medicine, (b) a company offering a health club facility in the same building where employers work, and (c) a tertiary hospital

asked by holeil on May 20, 2014
61. art history

This work by the Renaissance sculptor Donatello brought together antiquity and modernity by doing what? showing a biblical figure in a classical pose depicting a tale from mythology in a religious setting infusing emotion into a traditional subject

asked by dianni on November 2, 2018
62. English

I need help on this question: Which sentence does the verb correctly agree with the subject: A. A copy of Moby Dick and a magazine has disappeared from my room. B. Peggy or Phillis drive me to Flordia every winter. C. Les and Miranda is late for work

asked by Jin Kobeaux on March 24, 2008
63. Chemistry

indicate whether the following would increase decrease or have no effect on the solubility of copper (ii) carbonate (ksp - 2.5 x 10^-10) when compared to the solubility of water 1. dissolve it in an acidic solution 2. dissolve it in ammonia, forming a

asked by Alice on March 26, 2017
64. Chemistry

'Identify two factors that affect the change in entropy that occurs during the formation of an NaCl solution. State whether each factor causes an increase or decrease in entropy.' All I can think of is the dissolving process, which increases entropy, but

asked by SarahF275 on February 6, 2018
65. Chemistry College Level

Ok, so here's my question: If exactly 14.563 grams of KMnO4 were dissolved to yield 750 mL of solution waht would be the normality of the KMnO4? From a previous question (that this question says to refer to) we have: MnO4- +8H+ +5e --> Mn2+ +4H2O I'm not

asked by Tichele on April 17, 2011
66. Chemistry:Important!!!!!!!

A student begins with 9.7 mL of a 0.26 M Cu(NO3)2 solution and performs copper cycle lab. She recovers 0.075 grams of copper metal. A) What is the Theoretical Yield B) What is the Actual Yield C) What is the Percent Yield

asked by B on February 10, 2014
67. Chemistry

A student begins with 9.7 mL of a 0.26 M Cu(NO3)2 solution and performs copper cycle lab. She recovers 0.075 grams of copper metal. A) What is the Theoretical Yield B) What is the Actual Yield C) What is the Percent Yield

asked by C on February 10, 2014
68. Chemistry

Sulfuric acid (H2SO4) is a very strong diprotic acid. If 0.065 moles of sulfuric acid is mixed with water to make 456 mililiter of solution, what is the molarity of H+? Answer in units of M.

69. chemistry

What is the melting point of a mixture of 2.00 lb of NaCl and 12.00 pounds of ice if exactly half of the ice melts? Assume that all the NaCl disolves in the melted ice and that the van't Hoff factor for resulting solution is 1.44.

asked by Wiped on September 11, 2012
70. Chemistry

in the presence of NH3, Cu+2 forms the complex ion [Cu(NH3)4]+2. If the equilibrium concentrations of Cu+2 and [Cu(NH3)4]+2 are 1.8x10^-17M and 1.0x10^-3M respectively, in a 1.5 M NH3 solution, calculate the value for the overall formation constant of

asked by lena on April 3, 2012
71. chemistry

Sulfuric acid (H2SO4) is a very strong diprotic acid. If 0.062 moles of sulfuric acid is mixed with water to make 200 mililiter of solution, what is the molarity of H+? Answer in units of M

asked by cheri on September 13, 2012
72. accounts

Practical accounts quedtion with minimum 20 journal enteries,ledger,cash book,trial balance,adjusted trial balance,income statement,and balance sheet with solution

asked by ritika on January 25, 2015
73. Chemistry

A solution contains 23.1 ppm of dissolved Fe(NO3)3 (241.860g/mol), which dissociates completely into Fe3+ and NO3- (62.005g/mol) ions. Find the concentration of NO3- in parts per million

asked by Nick on January 9, 2015
74. Chemistry

Toluene, C6H5CH3, is a liquid similar to benzene, C6H6. It is the starting material for other substances, including trinitrotoluene (TNT). Find the molality of toluene in a solution that contains 26.2 g of toluene and 132 g of benzene.

asked by MJ on March 29, 2012
75. chemistry

2) Toluene, C6H5CH3, is a liquid similar to benzene, C6H6. It is the starting material for other substances, including trinitrotoluene (TNT). Find the molality of toluene in a solution that contains 25.8 g of toluene and 135 g of benzene.

asked by Mike on October 15, 2012
76. chemistry

Acids and bases • What is an acid? • A 500cm3 solution containing 1.9g of a weak acid HA has a pH of 3.50. Calculate the molar mass of the acid, given that it has a Ka of 2.0 × 10-6moldm-3 • Calculate the pH of the following: • 0.002moldm-3 NaOH

asked by chansa on June 7, 2016
77. physics

a concave mirror of diameter 40m is used with a 6cm tall object placed 20 cm from it. Where is the image? Can you check my solution Radius(R)=20cm Distance object(do)=20cm (2/R)=(1/do)+(1/di) (1/di)=(2/R)-(1/do) why do they give you the object height i

asked by shan on April 28, 2008
78. physics

A 5.0 gm marble is fired vertically upward using a spring gun. The spring must be compressed 8 cm if the marble is to just reach a target 20 m above the marble’s position on the compressed spring .(a) What is the change in the gravitational potential

asked by sunny on September 16, 2010
79. MATH

Suppose the annual expected mortality rate from coronary disease is 500 per 100,000 individuals. In a specific community of 600,000 individuals, how many deaths are expected to be attributed to coronary heart disease over a one year period? my work:

asked by Redgy on July 14, 2016
80. Math

A solid is made up of two rectangular prisms how would I find the surface area of the solid? The diagram shows 3 feet on top, 6 feet on the left side, 7 feet on the bottom, 2 feet and 4 feet to the right Our teacher gave us the answer of 156 then told us

asked by Josh on April 28, 2015
81. Art

In an effort to help a student understand the concept of shading, which teaching strategy could an educator use to help someone who learns best through hands-on activities? A. Explain shading techniques out loud. B. Write shading techniques on the board.

asked by Summer on April 14, 2015

This select group has been asked to consider the Colorado City Convention and Visitors Bureau survey of 25 hotels in the local area. The survey is concerned with the current availability of rooms. The availability of the rooms was as follows: 90, 72, 75,

asked by taabbie on April 27, 2012
83. english

In Germany they came first for the Communists, and I didn't speak up because I wasn't a Communist. Then they came for the Jews, and I didn't speak up because I wasn't a Jew. Then they came for the trade unionists, and I didn't speak up because I wasn't a

asked by sue on May 5, 2018
84. Physics

You decide to take a nice hot bath but discover that your thoughtless roommate has used up most of the hot water. You fill up the tub with 270 kg of 30.0°C water and attempt to warm it further by pouring in 5.00 kg of boiling water from the stove. (a)

asked by Anthony on July 18, 2010
85. Math

Kosuke wrote a mathematics contest consistingof 25 multiple choice questions, the scoring system gave 6 points for a correct answer, 2 points for not answering, and 1 point for an incorrect answer.Kosuke got x correct and left y unanswered questions a)

asked by Nancy on October 9, 2011
86. Physics

A ball is thrown horizontally from the top of a 65 m building and lands 105 m from the base of the building. Ignore air resistance, and use a coordinate system whose origin is at the top of the building, with positive y upwards and positive x in the

asked by Lauren HELP on September 11, 2014
87. Algebra

I don't know how to put this in standard form: f(x)=x^2-2x-15 I tried (x^2-2x+-x^2)-25-x^2, but x^2 doesn't factor into anything so I can't fully put it into standard form. can you show me how, plus how to find the x intercepts and y intercepts?

asked by Murajabash on November 12, 2009
88. Math

16.Four students are in line to perform in the talent show. Sally is ahead of Kevin. Marcus is behind Kevin. Sally is behind Jenny. Who is first in line Jenny

asked by Jerald on April 2, 2013
89. Physics

What net force F will accelerate a 0.5 kg mass at 4 m/s2? If this same net force were applied to a 20 kg mass, what would its acceleration be? Please show me step by step including the right equations

asked by Anonymous on October 2, 2016
90. author

“It is little wonder that they went land-mad…” Notice the verbs in this sentence. List at least three verbs that support this topic sentence and show how the settlers were indeed “land-mad

asked by angelique white on August 29, 2012
91. algebra

Let X represent the number of television show episodes that are taped in a season. Write an expression for the number of episodes taped in 6 seasons. The expression is?

asked by lei on February 8, 2017
92. ChemistryPRELABS

Mixtures of oxygen and nitrogen show almost ideal boiling behaviour. Nitrogen boils at 77.36 K and oxygen boils at 90.30 K. What is the boiling point of air?

asked by Ami on November 9, 2015
93. geometry

. Which of the following circles would show the locus of points in a plane 1 unit from the intersection of the lines x + y = 2 and x â€“ y = 4? a. center (4, 2), radius = 1 b. center (3, â€“1), radius = 1 c. center (3, 1), radius = 1 d. center

asked by faty on September 28, 2010
94. Math-properties

c(a*b) = (c*b)a Is this commutative, associative, or both? It feels like it is commutative since numbers change their order. However, it feels like it is associative, because different numbers are grouped together in the parenthesis. Is it possible to show

asked by Lisa on March 1, 2012
95. Math

Let log 2 = a, log 3 = b and log 7 = c. Express the indicated logarithm in terms of a, b, and c. 1-log3 5 (3 is the subscript of the log) ans:(1-a)/b, i need someone to show me the step bcus my ans is different from the given ans. my ans=(1/a)-b.

asked by ifi on March 28, 2013
96. chemistry

If the pressure on a 2.50 mL gas sample were doubled from 0.500 atm to 1.00 atm, what would be gas volume at the new pressure? my Answer 1.25 mL if i'm wrong can you show me how u got to your answer please.

asked by jakey on January 19, 2013
97. physics

A toy train track is mounted on a large wheel that is free to turn with negligible friction about a vertical axis (see the figure). A toy train of mass m = 2.5 kg is placed on the track and, with the system initially at rest, the electrical power is turned

asked by Emily on November 9, 2009
98. Social studies, help

How did advancements during the Gupta period transform mathematics? A. They invented algebra.**** B. They created the concepts of square numbers and square roots. C. They developed a decimal system with a numeral for zero. D. They made progress in

asked by Em on November 8, 2018
99. physics

A metal container, which has a mass of 9.4 kg contains 14.2 kg of water. A 1.7-kg piece of the same metal, initially at a temperature of 160.0°C, is dropped into the water. The container and the water initially have a temperature of 15.0°C and the final

asked by anonymous on April 16, 2012
100. english

use them to complete the sentences. Note:you must change the form of some of the words. 1.Many_____are exported from Africa to other parts of the world. 2.The______of a new official school song has been agreed by the staff and students. 3.the government is

asked by mr x on November 27, 2018