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 78
1. Maths

I am trying to work through the following equations and can't remember how to do them. I would appreciate if someone could show me how to do both questions so I can see the difference. Find the equation of the line that passes through A(4,-2) and is

asked by Mel on March 15, 2008
2. Chemistry

asked by mysterychicken on October 22, 2010
3. Quantum Mechanics

Calculate the probability of finding an electron in a 1s H-atom orbital inside the nucleus. Show your work and state your assumptions.

asked by Jill on April 28, 2009
4. Calculus

A position function has the positions listed below. t 2 4 7 10 12 f(t) 34 98 155 205 271 Approximate the instantaneous velocity at t=5. show work.

asked by DW on September 16, 2013
5. calculus

find the complex zeros of the polynomial function. write f in factored form. f(x)=x^3-10x^2+42x-72 please show work.

6. anatomy

What is the kcalorie value of a meal supplying 110g of carbs, 25g of protein, 20g of fat, and 5g of alcohol? Please help show work

asked by lizzy on April 21, 2009
7. Physic

Calculate the average speed of an oxygen molecule (with a mass of 5.3e-26 kg) at room temperature (300 Kelvin)show your work

asked by Luis on July 22, 2012
8. college algebra

find the complete zeros of the polynomial function. write f in factored form. f(x)=x^3-7x^2+25x-39 please show all work. I do not understand this.

asked by Heather on November 20, 2012
9. physics

16. A positive and a negative charge, each with a magnitude of 3.65 x 10-4 C, are separated by a distance of 0.67 m. Find the force on each of the particles. You must show your work for credit.

asked by lula on March 16, 2019
10. Chemistry

Give the physical state of CO2 under the following conditions: pressure = 4000 mmHg, temperature = 18 degrees F. show work!

asked by Sarah on September 6, 2011
11. Algebra2...........

Using the integers 2,3,4,5, How many 3-digit odd numbers less than 300 can be formed if no repetition of digits is allowed? Please explain and show work.

asked by Anonymous on July 1, 2013
12. Chemistry

Determine the theoretical field of aspirin for a student who started the experiment with 2.489 g of salicylic acid. Show your work.

asked by Margaret on February 12, 2013
13. Statistics

Below Find a sequence of probabilites generated using excel.What is this mystery poisson functions M? Be precise, down to one decimal and show work.

asked by Jason L on March 8, 2007
14. algebra ll

find a geometric means between 4096 and 972? my answers is (0.75)^4 if it wrong can you give the right answer and show the work as simple as you can. thank you

asked by Anonymous on October 26, 2008
15. college calculus

evaulate an intergral for length of curve with y=(sqrt(4-x^2)) and 0

asked by andrew on March 10, 2008
16. calculus

find the volume of the unlimited solid obtained by revolving y=1/(x^4 +1) around its asymptote, show work. helllpp pleaseee, I have no idea how to do this...

asked by eliz on March 16, 2017

Rewrite the expression tan(90°−θ)sinθ as one of the six trigonometric functions of acute angle thetaθ. Please show work + answer. I have a few of them to do. Thanks.

asked by chichi on July 27, 2016
18. Trigonomentery Maths to difficult help me

Given that cosZ=L where z is an acute angle.find and expression of (cotz-cosecz)/(secz+tanz)? plz help help help!!!! Show work

asked by Collins on January 6, 2016
19. Algebra 2

Using the integers 2,3,4,5, How many 3-digit odd numbers less than 300 can be formed if no repetition of digits is allowed? Please explain and show work.

asked by Anonymous on July 3, 2013

c. Find x using the ratios of the sides 6cm and 8cm. Show your work. Im having trouble solving this problem, mostly because im not sure what function to use. If i could get some help on this it would be appreciated.

asked by Space Dandy on December 15, 2015
21. Algebra 2

Using the integers 2,3,4,5, How many 3-digit odd numbers less than 300 can be formed if no repetition of digits is allowed? Please explain and show work.

asked by Anonymous on July 1, 2013
22. Algebra

Use the quadratic formula to find the exact solutions of the equation. Show work. Simplify the final results as much as possible. 4x^2 – 16x + 25 = 0.

asked by Bonnie on July 8, 2009
23. Math

Determine the angular velocity in radians per second of 4.3 revolutions in 9 seconds. Use π = 3.14. Round the answer to the nearest tenth. Show all work.

asked by Trish Una on June 14, 2019
24. Kinematics Physics

Please let me know if someone can help with this subject. I have summer school in physics because I did not get the first semester. I am still not getting it. Alyx Yes, we can help you. Post your questions, show your work, and we'll guide you in the right

asked by Alyx on July 29, 2006
25. Math

Write an equation and solve if possible please: 1.) You make 20 silk flower arrangements and plan to sell them at a craft show. Each flower arrangment costs \$12 in materials, and your booth at the craft show costd \$30. If you sell the arrangments for \$24

asked by Help FAST!! on August 13, 2008
26. education

During the middle of the twentieth century, North American psychology was dominated by A. evolutionary theory. C. neuroscience. B. cognitive development. D. behaviorism. 8. What is a major limitation of the psychophysiological method? A. Investigators

asked by mandy on September 27, 2012
27. Chemistry 2

Calculate the molarity of the following aqueous solution of 25.0 grams of MgBr2 in 0.355 L solution? Did I work this right? 25gMgBr2/184.113 gMgBr2 =.1357861748 mol MgBr2 then: .1357861748 mol MgBr2/0.355 L =.382 M

asked by Brandi on August 8, 2014
28. Chemistry

Question: At 300 K,Carbon powder and O2 are included in container of 10dm3.When the system is heated well,all the O2 converts into CO2.Then the system is cooled to the initial temperature. The volume of the Carbon powder is negligible. Find the percentage

asked by Shenaya on June 8, 2017
29. math

60 ml of solution A is mixed with 120 ml of solution B to produce solution C which contains 8% of pure acid. If 80ml of solution A is mixed with 40ml of solution B, a solution D containing 10% of pure acid can be produced. find the percentage of pure acid

asked by anjan on July 5, 2011
30. english

What is Bronte's main purpose in describing Jane's meals and activities at Lowood? A)to show how all schools operate B) to show the discomforts she endures at Lowood C) to show the interesting aspects of Jane's life at Lowood D) to show how students

asked by john on July 7, 2014
31. Chemistry

Show the mechanism that illustrates the following reaction. 1-methyl-1-methanol-cyclopentane + acid -> 1-methyl-cyclohexene So, there is an elimination reaction, *AND* the carbon ring grows from a five carbon ring to a six carbon ring. (I hope my IUPAC

asked by chemstudent on June 6, 2008
32. Algebra

Student tickets to the Homecoming game cost \$5 each. General admission tickets cost \$8 each. So far, 150 tickets have been sold. \$900 has been collected. A. Write a system of equations for this model in standard form. 5S = Student tickets: 100 sold 8G =

asked by Anonymous on June 2, 2017
33. Thermodynamics

A closed cycle gas turbine unit operating with max. And min. Temp. Of 760 and 20 Celsius deg has a pressure ratio of 7/1. Calculate the thermal efficiency and work ratio? Ans = 42.7 % , 0.505 My answers are : Efficiency 42.7 % which is correct.. but work

asked by Akki on November 26, 2015
34. Chemistry

Each of the following mixtures is placed in a dialyzing bag and immersed in distilled water. Circle the substances that will be found outside the bag in the distilled water. a. KCl solution and glucose solution b. albumin solution (colloid) c. albumin

asked by porsha on June 13, 2017
35. math

Can someone please show us how to show 1500 x 2.1? I can not for the life of me show my daughter how to come up with the correct answer she is just not getting what I am showing her.

asked by Ree on September 26, 2007
36. math

Find the GCF of the numbers using an appropriate method. 240, 10,000, and 4500 Find the prime factorization of the number, and write it in exponent form. 670 Find the LCM for the given numbers by an appropriate method. 24, 54, and 27

asked by anonymous on March 19, 2011
37. bubba

Find the GCF of the numbers using an appropriate method. 240, 10,000, and 4500 Find the prime factorization of the number, and write it in exponent form. 670 Find the LCM for the given numbers by an appropriate method. 24, 54, and 27

asked by anonymous on March 19, 2011
38. math

Solution Dilution question: An order for 25mg of a oral solution is needed. You have 1000g and a 30ml bottle to make the solution. How many ml will you need for 25mg of the finshed oral solution. So once the solution is made, I will need to get 0.75ml out

asked by AZ on December 24, 2017
39. Physics/Statistics

We're actually learning propigation of error in my chem class, but it seems to be used equally as much in Physics/Stats. My teacher showed us two methods of doing it: REAL Method (Addition/Subtraction): square root[(error absolute 1)^2 + (error absolute

asked by Amiga on September 14, 2006
40. For Hellpp - Algebra 2

I removed your original post because of an inappropriate name. Please -- in the future do not string out your name across the page. _________________________________ Homework Help Forum: Algebra 2 Answer this Question | Responses Posted by

asked by Ms. Sue on May 20, 2009
41. English

BACKGROUND: Ten years ago, I started working as a clerk for DMD Medical Supplies. Six months ago, Liz, the human resources director, promoted me to office manager. I manage two employees: Jack and Ruth. My office provides secretarial support for the four

asked by Kayla on March 29, 2012

BACKGROUND: Ten years ago, I started working as a clerk for DMD Medical Supplies. Six months ago, Liz, the human resources director, promoted me to office manager. I manage two employees: Jack and Ruth. My office provides secretarial support for the four

asked by Kayla on March 30, 2012
43. Science

What is an example of a stable system how were you able to determine whether or not the system is stable? Would a sea saw be a stable system because the output is under control and it returns back

asked by Need help on March 28, 2019
44. HISTORY!! help plz and thannks

what are protective tariffs and the factory system? I want to know what a factory system si because the question is Why was the factory system beneficial to Canadians. help plz and thank u!

asked by beecca on March 8, 2009
45. chem

2 NO(g) + O2(g) 2 NO2(g) For the reaction above tell whether the reaction would shift to the left (L) or right ® if I a. Increased the total pressure of the system b. Removed O2 from the system c. Increased the amount of NO in the system

asked by don on November 22, 2012

The accrual accounting system is a standard system used by most businesses and is also the system used in the simulation. In relation to the rules of accrual accounting, consider the following question: What is being "unaccounted" for?

asked by Patte on January 11, 2017
47. MATH help

Which of the ordered pairs in the form (x, y) is a solution of this equation? 5x-y/3=13 (2,-9) ,(3,-6) A. Neither is a solution. B. The first is not a solution, but the second is. C. The first is a solution, but the second is not. D. Both are solutions.

asked by flaca on October 29, 2015
48. Algabra A(1)

a solution of 67% soution is mixed with a solution o f57% to make 30 liters of a 59% solution. How many of each solution is used?

asked by Hannah on January 3, 2012
49. english

What is the appropriate citation method for your major or course of study? What have you learned about that citation methodology from Lesson Three of this course? Do you think you'll be able to use this citation method effectively to avoid plagiarism?

asked by jd on July 8, 2017
50. chem

how would I do the elimination reaction of 2-chloropentane. When I figured it out I got the products as being 1-pentene and hydrogen chloride. Is this correct?

asked by Lena on March 13, 2009
51. Physics

A woman with a mass of 50kg is standing on the rim of a large disk that is rotating at an angular velocity of .50 rev/s about an axis through its center. The disk has a mass of 110kg and a radius of 4.0m. Calculate the magnitude of the total angular

asked by Karla on March 27, 2007
52. Math/Calculus

The region R is bounded by the x-axis, x = 2, and y = x^2. What expression represents the volume of the solid formed by revolving R around the line x = 2? It seems that I'm not allowed to post images, so I will try to type out my answer: ∫[0, 4] π *

asked by Alice on April 28, 2018
53. Physics

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical

asked by Akbar on June 11, 2012
54. physics need help plz

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical

asked by Akbar on June 8, 2012
55. physics

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical

asked by Akbar on June 13, 2012
56. physics

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical

asked by Akbar on June 11, 2012
57. physics

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical

asked by Akbar on June 7, 2012
58. Differentiate

Can someone please differentiate y = sin x / x for me? What I did was put (sin x)(x)^-1 and used the product rule... So for me it was (sin x)[-1(x)^-2] + [(x)^-1(cos x)] Now as I'm looking at a similar homework problem I think my method may be wrong... If

asked by Kay on October 27, 2009
59. Chem

How would one balance the following redox reaction using the half reaction method? Fe(OH)2 + O2 + H2O ---> Fe(OH)3 This is in my chemistry teacher's homework, and it comes up with an answer, but I don't see how to use the half reaction method when there is

asked by Jake UCD 11/15/11 on November 15, 2011
60. Math

A biologist has determined that a particular osprey has a 70% chance of catching a fish on any given day. Carry out a simulation of 20 trials using the random number table below to find the probability that the osprey will actually catch a fish on all of

asked by Bob on May 20, 2014
61. Algebra 2

A biologist has determined that a particular osprey has a 70% chance of catching a fish on any given day. Carry out a simulation of 20 trials using the random number table below to find the probability that the osprey will actually catch a fish on all of

asked by Bob on May 20, 2014
62. Chemistry

I got this question wrong, and I'm not sure where my mistakes lie. Can someone show me what I'm not doing right and what the correct answers should be? "Some states have reduced the legal limit for alcohol sobriety from 0.10% to 0.080% alcohol by volume in

asked by Chris on September 19, 2006
63. Biology -- metric

Which statement best describes the significance of the number 10 in the metric system? The system is used by 10 countries There are 10 metric prefixes There are 10 base units The system is based on multiples of 10. * my answer How many places would the

asked by Anonymous on August 25, 2015
64. Help pls.

Compute the acceleration of the block sliding down a 30 deg inclined plane if the coefficient of kinetic friction is 0.20. Show solution pls.

asked by Yan-yan on August 23, 2014
65. Mechanics

Calculate the average horsepower required to raise a 200-kg drum to a height of 20 in a time of 1:0 minute. Show the solution and answer

asked by Aries on September 15, 2013
66. chemistry

Write a procedure in a number list for how you would make 300ml of a 7% (mass/volume) aluminum chloride solution. show all calculations

asked by Anonymous on May 15, 2011
67. Math ( i just need these two to finish my workshet

Show the solutions of 1. If a = 4, b = 3, and A = 36o. 2. If a = 3, b = 4, and A = 48.59o Finding a "solution" means solving for all missing sides and angle measures in each triangle.)

asked by Tony on July 28, 2012
68. Algebra I

Can you please show me the steps and solution to this problem? I really don't understand. Thank you very much. Write an equation in slope-intercept form of the line through points S(-2, -7) and T(4, 3).

asked by Marina on October 27, 2016
69. Maths

The cash price for a Tedelex Component system with a DVD is 1999.95.If you buy the system on hire purchase you must pay a deposit of 200.00 and an instalment of 91.00 per month for 24 months. (A)The total amount you would pay for the system on hire

asked by Jenny on June 21, 2018
70. parabolas

how do i find the equaion of the following parabolas? 1)intercepts at (2,0),(8,0) and (0,48) 2)turning point at (1,-2) and passing through the origin. can someone please teach me how to do this??thanks! The first: Write you standard equation of a parabola

asked by Emma on May 20, 2007
71. math

solve the inequality -5(x-7)

asked by diane on May 26, 2014
72. Math

How would you solve this for x using logarithims? I tried but when I plugged my answer for x back into the equation it didn't work at all. 4^2x = 9^x-1

asked by Anonymous on January 15, 2008
73. College Algebra

okay so using y = (-5/6)x + 3 how do i find the corresponding value for y when x = 12? here was the previous work to the problem. 5x+6y=18 solve for y 5x + 6y = 18 Subtract 5x from both sides. 6y = 18 - 5x Divide by 6 y = (18-5x)/6 or 3 - (5/6)x

asked by Alicia on November 16, 2007
74. Geometry

Solve for x. x(x+3)=2^2 I think I'm doing this all wrong. Here is the work I've done so far: x^2+3x=4 x^2+3x-4=0 ...now what? i started trying to use the equation x=-b sqrt of (b^2-4ac) but I'm just getting confused...

asked by Anonymous on May 16, 2009
75. matha

Please I am lost on how to find the derivative of function using first principal,could someone please work out an example on how to solve such problem?

asked by yanifa on June 4, 2017
76. math

Solve. 15x – 2(6x – 0.865) = 2x + 0.365 We will be happy to critique your work or thinking.

asked by veronica on May 7, 2007
77. science(physics)

a force f= 3i+cj+2k acting on a particle causes displacement , d=-4i+2j+3k. If the work done is 6 joule then the value of c. Plz. Solve

asked by marley on June 10, 2011
78. Precalculus

Hello, I just want to make sure I'm doing this correctly: Solve the following systems of equations algebraically. y=x^2-1 2x-y+2=0 My work: -x^2+2x+3=0 Divide everything by -1 x^2-2x-3=0 (x-3)(x+1)=0 x=3, x=-1 Thank you!! :)

asked by Kayla on September 29, 2018

solve x-sqrt(2x+1)=7 Can someone explain how to work this out. Im not exactly sure how you figure the square root part.

asked by Alehanda on April 18, 2008
80. Geometry

Solve for x. x(x+3)=2^2 I think I'm doing this all wrong. Here is the work I've done so far: x^2+3x=4 x^2+3x-4=0 ...now what? i started trying to use the equation x=-b sqrt of (b^2-4ac) but I'm just getting confused...

asked by Anonymous on May 16, 2009
81. Math

Creating the best fit straight line through a set of points on a graph is called 1. slope-intercept method. 2. connecting the dots. 3. linear regression. 4. the straight edge method. 5. the equation of a straight line.

asked by haley on September 15, 2009
82. algebra

a chemist needs 10 liters of a 25% acid solution. the solution is to be mixed from three solutions whose acid concentrations are 10% 20% 50% how may liters of each solution should the chmist use to satisfy the following? a use as little as possible of the

asked by sandy on April 26, 2008
83. Pre Calculus

I keep trying to solve this by factring but I can't seem to get! It's so frustrating! The problem is 1+tan2x=0 This is how I worked the problem before: 1+((2tanx)/(1-tan^2x))=0 ((2tanx)/(1-tan^2x))= -1 Then I cross multiplied to get: -1 + tan^2x = 2 tanx

asked by Jen on April 11, 2013
84. Math

Predicted winner in an election for town mayor . Method C: Telephone 100 randomly-chosen voters who live in the town. 54 percent plan to vote for the incumbent mayor. Method D: Telephone 70 people who have lived in the town for more than 25 years. 45

asked by Andrew on March 19, 2017
85. PHYSICS HELP

Please check to see if these statements are right. Through the process of doing work, energy can move between the external world and the system as the result of forces. I believe this is true. Please verify. Yes, true.

asked by Pat on January 10, 2007
86. statistics

A clinical trial tests a method designed to increase the probability of conceiving a girl. In a study 306 babies were born, and 174 of them were girls. the sample data with a 0.01 significance level to test the claim that with this method, the probability

asked by angela on November 25, 2013
87. Chem 2

A 50/50 blend of engine coolant and water (by volume) is usually used in an automobile\'s engine cooling system. If your car\'s cooling system holds 4.00 gallons, what is the boiling point of the solution? Make the following assumptions in your

asked by Paulie on July 14, 2012
88. chemistry

A 50/50 blend of engine coolant and water (by volume) is usually used in an automobile\'s engine cooling system. If your car\'s cooling system holds 4.20 gallons, what is the boiling point of the solution? Make the following assumptions in your

asked by Morgan Parker on March 2, 2013
89. Chemistry (PLZ HELP)

1. Outline a procedure to prepare an ammonia/ammonium buffer solution. I'm confused how to start it off. This is an outline of how the steps should be: Step One - Calculate the concentration of hydronium ions in the solution that requires buffering. You

asked by Emily on May 24, 2018
90. Businees(finance)

Nancy Tai has recently opened a revolving charge account with MasterCard. Her credit limit is \$1000, but she has not charged that much since opening the account. Nancy hasn't had the time to review her monthly statements as promptly as she should, but over

asked by Dena on April 7, 2008
91. algebra

hola necesito ayuda con mi tarea pero no entiendo como aserlo porque esta en ingles which ordered pair is the solution set of the following system of inequalities? y< 1/2x + 4 y> and equal to -x + 1 f:(-5,3) g:(0,4) h:(3,-5) j:(4,0)

asked by Anonymous on March 29, 2013

Josh and Racquel sold corn dogs and burritos at the math club fundraiser. The corn dogs(c) cost \$.35, and the burritos(b) cost \$.75. They sold a total of 600 items, and raised \$360. a)Write an equation for the total # of items sold. b)Write and equation

asked by <3Medic+Droid<3 on January 25, 2009
93. Calculus

a 160-inch strip of metal 20 inches wide is to be made into a small open trough by bending up two sides on the long side , at right angles to the base. the sides will be the same height , x. if the tgrough is to have a maximum volume, how many inches

asked by Someone on January 11, 2017
94. Math

SOLVE FOR USING SUBSTITUTION OR ELIMINATION A bicycle manufacturer builds racing bikes and mountain bikes. Materials for the racing bike cost \$110 while labor to build them is \$120. Materials for the mountain bike cost \$140 and labor is \$180. The company

asked by Tina on September 17, 2018
95. Algebra 2

SOLVE FOR USING SUBSTITUTION OR ELIMINATION A bicycle manufacturer builds racing bikes and mountain bikes. Materials for the racing bike cost \$110 while labor to build them is \$120. Materials for the mountain bike cost \$140 and labor is \$180. The company

asked by Tina on September 17, 2018

Anyone mind checking these 2 quiz answers please? Which statement best explains why nation-states write constitutions? A: Constitutions give citizens unlimited powers. B: Constitutions establish nation-states. C: Constitutions allow governments to elect

asked by Natalie on December 11, 2016
97. chemistry

What is the percent by mass of 3.55 g NaCl dissolved in 88 g H2O? 2. A solution is made by adding 1.23 moles of KCl to 1000.0 g of water. What is the % by mass of KCl in this solution? 3. If you have 100.0 mL of a 25% aqueous solution of ethanol, what

asked by Anonymous on February 10, 2011
98. heat

20 cubic inches of a gas with an absolute pressure of 5 psi is compressed untill its pressure reaches 10 psi. what is the new volume of the gas? ( assuming that there s no change in temperture) a. 5 cubic inches b. 10 cubic inces c. 40 cubic inches d. 100

asked by heather on July 11, 2006
99. physics

Subjects Art Business Computers English Foreign Languages Health Home Economics Mathematics Music Physical Education Science Social Studies Features Contribute Download Experts Forum Job Openings Homework Tips Libraries.Jiskha Link to Us Reference School

asked by leesa on February 23, 2008
100. Math

Write a program in C to find a root of a given equation using Secant Method. Perform five iterations to obtain the smallest positive root of the equation f(x) = sin x + 2tanx. Verify your answer with the program written by you. Please post the solution....

asked by Royal on March 13, 2012