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 63
1. chemistry

10.0 moles of NH3 and 10.0 moles of H2 are introduced into a 1.00 L flask. At equilibrium, 3.0 moles of NH3 gas remain. Calculate Kc for this reaction. N2(g) + 3H2(g) < > 2NH3(g) sorry i forgot to say show all the work please! We usually don't do the whole

asked by patrick on August 5, 2007
2. Simple Probability Question

A small manufacturing company has rated 80% of its employees as satisfactory and 20% as unsatisfactory . Personnel records show that 75% of the satisfactory workers had previous work experience in the job they are now doing, while 30% of the unsatisfactory

asked by Lina on May 13, 2014
3. math

asked by Jean on October 4, 2015
4. science

Calculate the mass% of different element present in H2SO4. Also show the solution.

asked by Ragini on June 13, 2014
5. Maths

By making the substitution u =ln x show that the following equation has exactly one real-number solution: -12/ln x +ln x^4 = -9

asked by Lauren on October 27, 2016
6. calculus

plz help show me steps solution evaluate the integral §dx/[(x+1)root(1-x^2)]

asked by dam on September 26, 2016
7. MATHS URGENT

By making the substitution u =ln x show that the following equation has exactly one real-number solution: 9/ln x + ln x^4 =-12

8. Math

If 4 is added to the numerator & denominator of 5/7, by how much is the fraction increased? Please show solution.. thanks

asked by JCO Sabellano on February 2, 2013
9. maths

By making the substitution u=ln x show that the following equation has exactly one real-number solution: -12/ln x + ln x^4 = -9

asked by Michael on October 25, 2016

it is known that b^2 - 4ac is a real root of equation ax^2 + bx + c = 0 (a=/ 0),then ( ) is true. (A) ab> = 1/8 (B) ab = 1/4 (D) ab

asked by Anonymous on July 18, 2018
11. maths

By making the substitution u =ln x show that the following equation has exactly one real-number solution: -12/ln x +ln x^4 = -9

asked by Lauren on October 26, 2016
12. chem

What is the pH of a 1.00 molar solution of NaNO3(aq)?The Ka for nitric is 0.0007.show all calculations

asked by Zitha on March 12, 2011
13. maths pppllllz hellllp me too hard

determine a series if solution of the equation y"(x)+x.y'(x)+y(x)=0 show me step plz

asked by philip on September 25, 2016
14. chemistry

A sample of 10.00g of a solid unknown was dissolved in 25.00g of water. Assuming that pure water freezes at 0.0°C and the solution freezes at -5.58°C, what is the molal concentration of the solution? What is the molar mass of the solid? Show your

asked by paula on January 24, 2015
15. Chemistry

A 156.5 g piece of stainless steel was heated to 510 C and quickly added to 25.11 g of ice at -30 C in a well-insulated flask that was immediately sealed. What will be the final temperature of the system if there is no loss of energy to the surroundings?

asked by Jerry on October 26, 2008
16. physics

how do i solve this, i tried dividing the mass by the height, but its wrong A 407-kg pile driver is raised 15 m above ground. (a) How much work must be done to raise the pile driver?__kj (b) How much work does gravity do on the driver as it is raised?__kj

asked by james on April 4, 2010

Two 5th grade classes raised money for their local animal shaelters.There are 20 students in Class A. Each student raised 12\$. There are 26 students in Class B raised 1.5 times as much as each student in Class A. A. How much money was raised altogether in

asked by Kristiana on October 1, 2012
18. math 118

a. Suppose a market research company finds that at a price of p = \$6., they would sell x = 44 tiles each month. If they lower the price to p = \$2, then more people would purchase the tile, and they can expect to sell x = 48 tiles in a month’s time. Find

asked by jer on February 4, 2012
19. substitution method

-3x+y=-5 x+2y=0 Your equations: -3x + y = -5 x + 2y = 0 Let's solve the second equation for x: x = -2y Now let's substitute -2y for x in the first equation to solve for y: -3(-2y) + y = -5 6y + y = -5 7y = -5 y = -5/7 Now let's substitute -5/7 for y in the

asked by sooto on February 20, 2007
20. pharmacy tech.

Prepare 500ml of a 1:5 solution using a 1:10 solution and a 1:4 solution. What quantities will be used of each stock solution to make the 1:5 solution?

asked by blackpearl07 on August 5, 2012
21. pharmacy calculations

prepare 500 ml of a 1:5 solution using a 1:10 solution and a 1:4n solution. what quantities will be used of each stock solution to make the 1:5 solution?

asked by cleondra on August 3, 2012
22. Physics

If the heat of 110J is added to a gaseous system, change in internal energy is 40J, then the amount of external work done is?

asked by Anshu on February 12, 2017
23. Chemistry

In a gas expansion, 69 J of heat is absorbed from the surroundings, and the energy of the system decreased by 118 J. Calculate the work done. _______ J

asked by Rose on October 31, 2010
24. Chemistry

What is the total internal energy change (∆E), in J, of a system that releases 202.90 J of heat and absorbs 315.7 J of work from the surroundings?

asked by Katie on June 10, 2015
25. Social Studies

A system in which a series of workers and machines work to add individual parts to a product is known as a(n)____and it_____. Link please to help me?

asked by Amber on March 23, 2016
26. Chemistry

In a gas expansion, 69 J of heat is absorbed from the surroundings, and the energy of the system decreased by 118 J. Calculate the work done. _______ J

asked by Betty on October 31, 2010
27. Chemistry

3. A chemistry student makes up a 0.10 M solution of NaF(aq) and finds the pH to be 8.09. a. Explain why the presence of F- in this solution affects the pH. b. Write out the acid/base equilibrium equation for the reaction of F- with water. c. Use the

asked by chamy on April 4, 2012
28. MATH

The work crew for the talent show at the local high school includes these members: 2 freshmen,4sophomores,8juniors,6 seniors.If the sponsor randomly chooses 1 member of the work crew to announce the act & 1 member to control the lighting, what is the

asked by marilyn on April 12, 2017
29. graph

can someone SHOW me how to solve these graphs?2x > -6 and x - 4 < 3 x + 5 > 2x + 1 and -4x < -8 -6 < x + 3 < 6 (Remember this is an "and" statement) -3x < -6 or x + 5 < -2 x - 2 > 2x + 1 or -10 > -2x - 2 Look at the third. -6 < x + 3 < 6 (Remember this is

asked by mike on June 29, 2007

I can answer this question, but I need to explain to our child how to solve it using the method requested, not an algebra solution. Child is becoming frustrated and confused while attempting to answer these questions. the instructions for solving, are try

asked by Paulette on August 23, 2012
31. Algebra 1 (Ms. Sue or Steve or Reiny)

Solve each inequality. 1). |z -6| + 8 > 5 A: No solution? 2). 2|x -3|

asked by Anonymous on October 28, 2013
32. Algebra

Please Solve: x + (sqrt11-x) = 5 A. 2 B. 7 C. 2, 7 D. No solution

asked by Kim on August 3, 2009
33. Calculus

Solve the inequality |5+(2/x)|

asked by Larin on March 6, 2017
34. Math

If (x, 3) is the solution to the equation 4x+2y=22, then what is the value of x? Can you solve it for me so i can see how you did it? a. 8 b. 6 c. 5 d. 4

asked by HELPP!!! on January 10, 2013
35. Algebra 1A

solve: 7x13

asked by James on September 28, 2009
36. algebra

solve 4/5(2x-3)>12 The solution set is

asked by beth c. on July 28, 2011
37. algebra

solve for the indicated letter c=2d, for d solution is d=

asked by scatterbrain on September 11, 2009
38. Math 116a

Solve 9/10(3+8x)+3¡Ý15 The solution is {x|x }

asked by katie on September 23, 2011
39. Algebra 1A

Help!! solve 2.4x+22.0>55.0-8.6x the solution set is {x]x> ?}

asked by Paul on September 30, 2009
40. algebra

solve for solution 6m+n=17m-5n=8

asked by vee on March 16, 2011
41. Math 116 algebra please check

Solve -8¡Ü4x-7¡Ü-2 The solution is -1/4,5/4

asked by jay jay on July 16, 2008
42. Math 116a

Solve and Graph 2x+9¡Ý5 and 2x-13¡Ý-9 The solution is {x|x¡Ý } Help

asked by katie on September 23, 2011
43. math

solve -16

asked by jason on June 29, 2009
44. Math

Find the solution to: Solve: 0.9x+9

asked by Nikki on August 20, 2010
45. Algebra - Math

How do you solve 5y+4=5(y+3)-11 ? when i did it out i got 0y = 22 so no solution but i don't think it's right ?

asked by Mimi tran on October 15, 2012
46. math

Find the solution to: Solve: 0.9x+9

asked by Delores on August 20, 2010
47. math

Solve: Check your solution. 3y - 7 = -3y + - 19

asked by Anonymous on January 21, 2015
48. math

solve by substution 4x-3y=36 x=2y+7 solution

asked by dustin on May 20, 2008
49. Algebra

Solve (x+12)(x-10)(x+3)>0 Solution set is:

asked by Greg on June 9, 2010
50. Confused

Solve with a solution set 3(3+4x)-6>63

asked by Felicia on June 13, 2008
51. Help

Solve the equation q+7/4+q-3/3=5/2 I think there is no solution

asked by Katie on October 28, 2011

Solve. 6y-6

53. Marie

Maurice drove 400 km from Edmonton to Battleford in 1 hour less time than it took Martin to drive the same route from Battleford to Edmonton. If Maurice drove 20 km/h faster than Martin, at what speed did each of them drive? Show a complete algebraic

asked by Shay on February 25, 2007
54. PHYSICS

The acceleration of the center-of-mass point of a system of particles depends on: a) all the forces acting on the system b) only the external forces acting on the system c) only the internal forces acting on the system

asked by terrence on March 19, 2007
55. Computer Science

For java programming, what is the difference between read() and next()? For example: Let's say I import the java Scanner class. Then I proceed as follows: Scanner userInput = new Scanner(System.in); System.out.print("Enter the number of students: "); int

asked by Kid on November 10, 2018
56. Chemistry

What NaCl concentration results when 209 mL of an 0.660 M NaCl solution is mixed with 492 mL of a 0.270 M NaCl solution? __ mol/.209 L = 0.660 M __ mol/.492 L = 0.270 M .. I have no idea how to solve this. I have no idea why I even set up the equation

asked by Katherine on April 9, 2012
57. Pre-Cal (Help Plz!)

Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.) (tan^2θ-9)(2cosθ+1)=0 θ=__________________ I got

asked by Amber on July 11, 2016
58. Chemistry

Prepare a 0.0200 mM dye solution at low pH by dilution 0.40 ml of the stock 0.100 mM chemical X into the appropriate volume of 2.5 M HCl. What is the amount of HCL required for dilution, the final concentration of HCl in the solution, and the pH? I know

asked by Emma on June 24, 2010
59. algebra

Can someone please help me with this one? Solve (5x+4)^1/2-3x=0 Just so you know, it is to the 1/2 power. Add 3x to both sides of the equation, then square both sides. That should enable you to gather terms and factor. Yeah, that's the part I understood.

asked by Lydia on March 10, 2007
60. Maths

You have seven balls labelled 1,2,…,7 and seven unlabelled, indistinguishable boxes. How many different ways can the balls be placed into the boxes? Can anyone please work the complete solution. I got the answer but it was solved by my brother and he

asked by Satyam on June 25, 2013
61. Chemistry

Only a chemist can be trusted with the combination to the safe containing a ton of money. The combination is the pH of solution A, followed by the pH of solution C. (for example: is the pH of solution A is 3.47 and the pH of solution C is 8.15 the

asked by Dan on April 30, 2007
62. physics - quantum mechanics

hi can you please help me with this particular question? thanks a lot ___________________________________ The work function of a material refers to the minimum energy required to remove an electron from the material. Assume that the work function of gold

asked by duda on August 5, 2007
63. algebra

It takes 7 hours for Isabella to rake leaves by herself.Her brother can work 3 times as fast.if they work together,how long will its take them to rake leaves? My answer: Isabella can do one job in 7 hours (1/7in one hour).Matthew does 3/4 of the job in one

asked by Anneliese on May 29, 2017
64. Math

Suppose A,B, and C are positive integers such that 24/5 = A + 1/B+1/C+1 The value of 1A + 2B + 3C equals: (A) 9 (B) 12 (C) 15 (D) 17 (E) 20 hey i am trying to solve the problem, is it written like A+1 _____ B+1/C+1 A + 1 ______ B + 1 ____ C + 1 sorry it

asked by Jason on April 4, 2007
65. chemistry

Experiment: Gravimetric Determination of Phosphorus in Fertilizer Samples 1. Can NH4Cl be used as a substitute to precipitate the phosphorus in the sample? Why or why not? - I think, NH4Cl can be used although I'm not quite sure if Cl- ions have some

asked by Smiley on August 17, 2007
66. CHEMISTRY

How many grams of sulphuric acid (H2SO4) are needed to make 1.5L of a 1.5 molar solution? ~~~~~~~~ Here's my work so far: 1.5L x 1.5mol/L = 2.25molH2SO4 2.25mol H2SO4 x 98.09g H2SO4 / 1mol H2SO4 = 220.7025g H2SO4 I wanted to ask if my work is correct,

asked by Anonymous on March 4, 2015
67. Math

1)Solve 3+2(1-x)>6 or 2x+14

asked by Jon on February 24, 2008
68. Biochemistry

Can someone help me calculate protein concentration using the Bradford Assay? If you could show me how to do tube 2, that'd be great. Tube 1: 0 ul Protein Stock Solution, 800 ul Water, 0 ug Protein, Absorbance @595nm = 0 Tube 2: 10 ul Protein Stock

asked by OR on October 7, 2013
69. physiscs

A 10g sample of an unknown ionic compound is dissolved, and the solution is treated with enough AgNO3 to precipitate all the chloride ion. If 30.1 g of AgCI are recovered, which of the following compound could be the unknown? A. NaCI B. NaNO3 C.BaCI2 D. Mg

asked by Jay on November 14, 2010
70. Intermediate Accounting

A company changes from straight-line to an accelerated method of calculating depreciation, which will be similar to the method used for tax purposes. The entry to record this change should include a debit to retained earnings i nthe amount of the

asked by Jeniffer on February 7, 2010
71. calculus

Show that tan^3(x)-8(tan^2(x))+17(tan(x)0-8 = 0 has a root in [0.5, 0.6]. Apply the Bisection Method twice to find an interval of length 0.025 containing this root. I have NO idea where to go with that equals 0 part...I could figure it without it but that

asked by terra on October 24, 2011
72. Calculus

The region enclosed by the graph e^(x/2), y=1, and x=ln(3) is revolved around the x-axis. Find the volume of the solid generated. I don't understand if we have to use the washer method or the disk method for this one because when I drew it out on a graph

asked by David on March 1, 2017
73. Calculus

The region enclosed by the graph e^(x/2), y=1, and x=ln(3) is revolved around the x-axis. Find the volume of the solid generated. I don't understand if we have to use the washer method or the disk method for this one because when I drew it out on a graph

asked by Dave on March 1, 2017
74. Sociology Research Methods

You are conducting a survey for a national organization with 25,689 dues-paying members. (a) What sampling method would be the most logical to use? (b) What are the steps you would use to develop the sample? (c) What are the advantages AND disadvantages of

asked by Faye on June 24, 2017
75. math

Jeff wants to start a lawn maintenance service to earn money for college. He wants to charge \$25 for a small lawn and \$35 for a large one. It takes him an average of 2 hours to mow and trim a small lawn and 3 hours to do a large one. He wants to make at

asked by Cj on May 9, 2012
76. Finance

Calculate the monthly finance charge for the credit card transaction. Assume that it takes 10 days for a payment to be received and recorded, and that the month is 30 days long. (Round your answers to the nearest cent.) \$200 balance, 14%, \$50 payment (a)

asked by NLJ on November 22, 2014
77. CALCULUS

Using separation of variables technique, solve the following differential equation with initial condition dy/dx = (yx + 5x) / (x^2 + 1) and y(3) = 5. The solution is: a.) y^2 = ln(x^2 + 1) + 25 - ln10 b.) ln(abs(y+5)) = ln(x^2 + 1) c.) ln(abs(y+5)) =

asked by Anonymous on May 26, 2012
78. science

A drop of mass 2.0 g falls from a cliff of height 1.0 km. It hits the ground with a speed of 50.0 m/s. The work done by resistive force is 1. -10j 2. -12.50j 3. -15.5j 4. -17.50j solution:- I think change in kinetic energy can give me work done. B ut how

asked by 911 on October 13, 2015
79. science

A drop of mass 2.0 g falls from a cliff of height 1.0 km. It hits the ground with a speed of 50.0 m/s. The work done by resistive force is 1. -10j 2. -12.50j 3. -15.5j 4. -17.50j solution:- I think change in kinetic energy can give me work done. But how to

asked by 911 on October 13, 2015
80. chem

Calculate the final concentration of a. 4.0 L of a 4.0 M HNO3 solution is added to water so that the final volume is 8.0L b. Water is added to 0.35L of a 6.0M KOH solution to make 2.0L of a diluted KOH solution. c.A 20.0 mL sample of 8.0% (m/v)NaOH is

asked by tracy on November 8, 2012
81. Math!

6a + 5b = 10 , 6a - b = -110 a=________ b=_________ 6a + 5b = 10 6a - b = -110 =================== Subtact equation 2 from equation which will eliminate a. Solve the resulting equation for b, then substitute into either original equation and solve for a.

asked by kare on August 24, 2006
82. math

solve the two sided inequality and show the solutin on real number 7

asked by Samee on November 2, 2010
83. Mathematics

Solve d/dx x(ln(x)-1) I had: =d/dx xln(x) - d/dx 1 =d/dx ln(x)^x =x^(-x-1) [and this is wrong] Can someone show me the correct answer and working please?

asked by xX_Supaman_Xx on December 5, 2007
84. math

Can somebody explain to how to solve this problem. -3 divided by 6 show in a reduced form)

asked by cora evans on January 22, 2014
85. Math

Can you show me how to solve this problem? You have a die, what is the probability you will not get a six, six times in a row?

asked by Steven on October 1, 2007
86. math

25.83/3.71x/5.3 find unknown proportion. show steps to solve

asked by Anonymous on December 5, 2012
87. mathematics-cubic equation

. solve the cubic equation 2x^3-11x^2+18x-8=0 show workings #thanks

asked by P1 on March 26, 2016
88. Calculus

Pls help solve this problem if sqrt(y)=(arctan)tan-1(x), show that (1+x^2)dy/dx((1+x^2)dy/dx)=2

asked by NGOFAKA on October 23, 2007
89. Algebra

Help meh solve and show the process pls r/15 (is great or than or equal to) -3 Thank you

asked by Crisps on February 4, 2018
90. Algebra 1

Clearly show and explain each step for full credit. solve the inequality |4x-3|=5

asked by Daniel on February 28, 2013
91. Algebra

Quadratic formula x^2+6x+8-0 (solve by factoring) (second Problem) 5w^2-3=0 Please show steps

asked by tbell on May 29, 2014
92. Math

Solve the equation: (-3/p+2) = (-8/p-3) Can someone please show me how to do this? I have a whole page of these to do but I don't really know what to do. If I could just see one done, I'm sure I can figure the rest out. Thank you.

93. Algebra

I'm trying to solve this equation for x. .6 = x / x + 20 I can tell that X=30, but how do I prove that mathematically? We can't just plug in numbers, we have to show where we got them from.

asked by Craig on February 16, 2009
94. math

solve 3x^3+x^2-8x+4>0. show all the algebraic calculations. (5 marks) (for grade 12 ways)

asked by Navin on November 25, 2013
95. math

ln x^4 + ln X = 24 ln e. Find the value of x. ln x^5=24 x^5=e^24....next i don't know how to solve it. someone plz show me the calculation steps.

asked by ifi on March 25, 2013
96. Math

solve for x, where x is a real number. (x^2)+3x-4=14 Please show me the steps im missing one and i cant figure out what

asked by star on August 19, 2011
97. Calculus

Use the function f and the given real number a to find (f^-1)'(a) f(x)=(x+9)/(x+3), x>-3, a=2 f(^-1)'(a)= ? Can someone please show me how to solve this problem?

asked by Alyssa on November 13, 2016

solve the following quadratic equation and show steps 2z^4 +14z^3 + 20z^2

asked by Anonymous on April 9, 2013
99. algebra

2x^2-2x-1=0 How do I use the quadratic formula to solve this because I am totally new at this and need help? Please show me the steps for this equation,so I will be able to do it own my own. Thank you.

asked by paulina on September 5, 2010
100. algebra 2

Solve the equation. Check for extraneous solutions. 9|9-8x|=2x+3 can anyone please show me how to do this problem?

asked by gamer chick on September 5, 2014