# 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 556
1. ## Math

Difficult conversion problem---imgur*com#Ojmb7*jpg (replace * with . and # with / to get proper URL...sorry about the extra work but this site isn't letting me post links)

asked by . on September 7, 2010
2. ## Chemistry

2CO(g) + O2(g) 2CO2(g) Go = -511.6 kJ and So = -173.1 J/K at 314 K and 1 atm. The maximum amount of work that could be done by this reaction when 2.43 moles of CO(g) react at standard conditions at this temperature is__________ kJ. how?!

asked by Bryan on April 26, 2012
3. ## thermodynamics

deremine (a) the work done and (b) the change in internal energy of 1.00 kg of water when it is all boiled to steam at 100c. Assume a constant pressure of 1.00 atm and heat of vaporisation = 2260000 J.

asked by frank fred on April 15, 2012
4. ## Physics

A 50.0-kg student climbs a 5.00-m-long rope and stops at the top. (a) What must her average speed be in order to match the power output of a 200 W light bulb? (b) How much work does she do?

asked by Kelly on October 7, 2007
5. ## thermodynamics

deremine (a) the work done and (b) the change in internal energy of 1.00 kg of water when it is all boiled to steam at 100c. Assume a constant pressure of 1.00 atm and heat of vaporisation = 2260000 J.

asked by frank fred on April 15, 2012
6. ## Grammar

1.I wrote on my journal while I listened to (softly, soft) music. 2.Classes at SEO go by so (slow, slowly) during the summer. 3.As she presented her work, her voice sounded (different, differently).

asked by LaLy on July 10, 2010
7. ## Uncountable nouns

1.work 2. skin 3. sand 4. rain 5. postcard 6. traffic 7. accident 8. air 9. cloud 10. information 11. happiness 12. news 13 furniture 14. entertainment Please help to check the above whether they are all correct, thanks & regards.

asked by deyond ng on February 18, 2017
8. ## physics

Calculate the energy in kcal used by a 53-kg woman who does 55 deep knee bends in which her center of mass is lowered and raised 0.400 m. (She does work in both directions.) You may assume her efficiency is 20%.

asked by Mary Katheryn on April 23, 2014
9. ## business

The vice president of human resources at Ato Enterprises feels strongly that workers need to realize the benefits of their hard work. This reveals the firm's responsibility

asked by Anonymous on March 31, 2011
10. ## 6th grade math

my work sheeet said use each of the symbols add,subtract,multiply,and divide to make thte following math sentence true. 12___ 3___ 7___ 1____ 11=0

asked by Daysi on September 21, 2009
11. ## Math

Hi! I need to work out how much water is used per minute in my showerhead, per toilet flush, each dishwasher load, washing machine cycle and taps. How would you suggest I do this if I cannot access the information online? Thanks

asked by JJ on March 31, 2011
12. ## planning & implementing for the environment

Purchasing equipment that has multiple uses can A. be more accessible to the children. B. make less work for staff. C. cut costs and encourage creative play. D. be easier to find. My answer is A

asked by Amanda on October 16, 2014
13. ## Physics

Find work done when 25kg weight lifted to a vertical height of 2m from the ground carrying to the same place by pushing it up and inclined plane make the angle of 30 degree (g=9.8)

asked by Samarth on March 7, 2017
14. ## English

Trying to help my daughter who is in grade 6 with her home work I'm not understanding what to do it says Fill in the empty sound boxes to represent the sounds in each homogragh. I got a BOW and arrow for my birthday. ________________? can you help please.

asked by kellie white on June 26, 2019
15. ## To Jen: College

I've removed your post because a) it contained a reference to which we have no access b) it gave no idea of your ideas or work on this assignment Note: We had no connection with any college, and we don't do homework assignments.

asked by Ms. Sue on April 19, 2009
16. ## History

Which was the Catholic Church’s most powerful tool in maintaining its authority in medieval Europe? A. ******** its missionary work B. its monasteries and convents C. its control over the sacraments D. its hospitals and schools

asked by Gacha Lover on November 30, 2018
17. ## physics

A merry-go-round of mass 1640kg has a radius of 7.5m. How much work is required to accelerate it from rest to a rotation rate of 1 rev. per 8 seconds? (assume a solid cylinder) /

asked by Mark on March 29, 2011
18. ## physics

a man pushes a lawnmower 50ft in 5s by exerting a force of 30lb at an angle of 53degrees with the horizon. find the work done and the average power expended in horsepower.

asked by kled on September 26, 2016
19. ## Chemistry

This is sort of like the one I last posted, only it asks for the final temp. instead of energy... What is the final temp. (in degrees C) after a 15.5 g piece of ice at 0 degrees C is placed into a styrofoam cup with 125.0 g of water initially at 72.0

asked by Lindsay on May 14, 2007
20. ## chemistry

write a balanced equation to show the reaction that occurs when: a) carbon react with bromine b) germanium react with fluorine c) tin with oxygen d) lead with hot concentrated hydrochloric acid. e) silicon react with steam

asked by amos on May 7, 2019
21. ## mathematics

if7 times the 7th terms ofan arithmetic progression is equal to 11 time is 11th terms, show that its 18th term is 0 can you find the 1st terms andthe common difference -justify your answer

asked by rajeswari on April 4, 2016
22. ## Grammar advisor

there are 100 questions on a quiz after taking the test I can only manage 66 % I have heard many students complain they can't get more the 69% after the test we don't receive the test results that show our right or wrong answer so now we dont' know what we

asked by Jim Collum on June 9, 2013
23. ## Algebra

Carmen wants to add to her menu by selling BLT sandwiches. How much should she charge for the BLT if she would like to make 35%-40% profit on each BLT? Show how you know your pricing is correct. Costs for ingredients for 4 BLTs: Bread \$6.20 Bacon \$4.25

asked by Caden on February 5, 2019
24. ## Math

My question is to get a better understanding of this. Basically, these two problems, I did it WITHOUT replacement. So I would multiply each defects and so forth. My question is, would I have to subtract the total from 1 in the second question? I am not

asked by J on March 6, 2007
25. ## Algebra

The product of 3 consecutive integers decreased by the cube of the first is 85. Wahat are the integers? THE GIVEN EQUATION IS: (x)(x+1)(x+2)-xcube = 85 How can i solve this ?

asked by Chesca on July 2, 2014
26. ## math

I need to solve this problem , bought 6 ribbons each ribbon is 1/4 yard long how many yards of ribbons do i need to buy?

asked by Benny on February 10, 2015
27. ## CHEMISTRY

Solve for the new pressure in each of the following with N and V constant A sample of Na with a pressure of 770 mmHG at -60C is heated to 23C

asked by SHARON on July 24, 2011
28. ## Math

Solve each equation by completing the square. -36x=8x^2+28 -8x^2-3x=-5 5x^2-x-6=0 6x^2-24x-30=0 7x^2+8x-12=0 -10x^2 -9x+1=0 5x^2-x=4 -11x^2-8x=-7x-10 -3 1/3x^2+ 10x -27 1/2= -231/3

asked by Monte' on November 10, 2007
29. ## Math

Find the vertex of F(x) by using the formula for the x-coordinate of the vertex. F(x)= 4x^2 - 3x - 6 I don't exactly understand this question. could someone clear it up and help me solve it? Thanks!!

asked by Jenny on August 18, 2010
30. ## Algebra 1

The formula for the volume of a rectangular prism with the length l, width w, and height h is V = lwh. Solve this formula for w.

asked by Anonymous on September 30, 2013
31. ## mathematics

solve problem using ratio 5:8 in a school are girls and 135 boys how many children are in the school in total.

asked by Anonymous on September 3, 2014
32. ## mega urgently important maths

the functions f and g are defined by f(x)=2/(x+1), x>0 g(x)=1-x^2, xER a)find value of fg(x)giving your answer in the simplest form. b) find f^-1(x) c) solve f(x)= f^-1(x)

asked by ??? on September 28, 2009
33. ## Algebra I

So- im trying to help my little brother out with his Algebra- but its been awhile since i have had algebra class- we need help with the following question: Solve the following equation for x: 2(x+4)=4x+12 2x+8=4x+12 2x=-4 x=-2 I think, lol I'll buy that.

asked by Briana on January 21, 2007
34. ## Math

i don't know how to solve this, i'm so lost. determine the exact value of c cot( 4c- pie/4) + tan ( 2c + pie/4)= 0 please help me!!! THANK YIU

asked by jake on June 18, 2011
35. ## Riddle

Help. Solve You are in a room with no windows, doors or any exit. Your only 2 items in the room are a mirror and table. How do you escape ??

asked by Joe on July 14, 2018
36. ## Math - Solving Graphically

1. 8 + 7x =2x² I used my calculator to graph this and got x is about 4.41 and -.904 2. 1/3x² - 15 = 0 Again, I graphed on my calculator and got x is about 6.70 and -6.70 Are these answers accurate and is there another way to solve?

asked by Anna on September 1, 2010
37. ## Math

Solve each equation by completing the square. -36x=8x^2+28 -8x^2-3x=-5 5x^2-x-6=0 6x^2-24x-30=0 7x^2+8x-12=0 -10x^2 -9x+1=0 5x^2-x=4 -11x^2-8x=-7x-10 -3 1/3x^2+ 10x -27 1/2= -231/3

asked by Monte' on November 10, 2007
38. ## Maths Dividing Farction

I need help to solve this:= 16 pies were shared among some women in a party. Each woman received 2/5 of a pie. How many women were there in the group?

asked by Sarah JJ on February 14, 2015
39. ## Algebra 2

I need to know how to solve quadratic equations by factoring. Can you so a step by step explanation to this sample problem? 2 x -12x-28

asked by Joanna on November 30, 2009
40. ## math

Write a real-world problem that you solve by writing an equation.The answer to the problem must be 6. 4 divided by 24=6

asked by yuki on January 19, 2016
41. ## Chemistry

It is easy but I cannot solve or do buffer questions/slns.. Please help. Describe the preparation of 500 ml of 1 M phosphate buffer at pH 7.2.

asked by Buffer sln on October 12, 2014
42. ## Maths (Linear and Quadratic Equations)

I need to solve a pair of equations where one is linear and the other is quadratic. 2x2 + 3xy + y2 = 0 3x + y = 2 last 2 in 2x2 is square root two, same after y2. help please!!!!!!!!!!!!!!!

asked by Saud on November 21, 2012
43. ## College Algebra

Use rational root theorem and the factor theorem to help solve the following equation X4-2x3-13x2+38x-24=0

asked by Ruth on November 6, 2011
44. ## calc

Each of the regions A, B, and C bounded by f(x) and the x-axis has area 5. Find the value of ∫2 [f(x)+3x^2+2]dx. −4 I know to solve I can find the antiderivative of the equation but im not sure how to do this because of the f(x) in the parentheses.

asked by DD on November 16, 2014
45. ## hw

concentrated sulfuric acid has a density of 1.84 g/ml. calculate the mass in grams of 1.00 liter of this acid. how to solve this?

asked by hw help ASAP on September 22, 2011
46. ## Math helppp

The area of a playground is 64 square yards. The length of the playground is 4 times longer than its width. How can I solve this?

asked by Jessica on October 12, 2017
47. ## calc

2cos2x=-sinx solve for x over the interval [-pi,+pi] x= 0.6349radians x=2.507radians x= 1.003 radians x= 2.138 radians

asked by SkiMasktheSlumpGod on December 26, 2017
48. ## 7th grade math

A large carton of juice holds 12 cups. How many 3/4 cup servings does the carton hold? I'm not sure how to solve it at all.

asked by Reece on September 11, 2014
49. ## Math

Use inverse operations to solve each equation. Explain each step and identify the property used to reach step. 19 = h/3 - 8

asked by Darkdream on January 18, 2018
50. ## Geometry

1. MO bisects LMN, LMN = 5x-23, LMO = x+32. Find NMO. >>I got the answer 45.75 but I got it wrong. I do not know how to solve this question and I have tried all that I know. Please help..

asked by Needs Help on January 24, 2011
51. ## math

Solve for X (3x+2)^(1/3)=-2 I multiplied (3x+2)^(1/3) by the power of to cancel the 1/3 I put -2 to the power of 3 as well getting -8 After I subtracted 2, getting me -6 dividing by 3x, I got -2 as my answer. Is this correct?

asked by john on January 28, 2016
52. ## algebra

factor the expression by using areas X^2+2x-3 solve the inequality (enter infinity for and infinity for-8 as needed.7 is less and equal 2-y

asked by missfubu-c on October 19, 2012
53. ## Algebra 1:Problem Solving

How many different seven-digit telephone numbers are available if the only restriction is that the first digit can't be 0? Is there a formula for this to make it simpler? Then I'll solve this problem myself.

asked by Thea on October 4, 2009
54. ## Math

there is \$175,000 to award. If the money is awarded to 4 students in a ratio of 1 to 2 to 3 to 4, how much will the largest award be? How would I solve this ?

asked by Amy~ on September 5, 2010
55. ## Geometry

Point J is between H and K on line segment HK. use th given information to write an equation in terms of x. Solve the equation. Then find HJ and JK. HJ=(x/4) JK= 3x - 4 KH = 22

asked by Aaron on September 1, 2014
56. ## Math

how to solve: In a survey at a supermarket, 78 out of 120 people surveyed said that they shopped more than once a week. What percent of the people is that?

asked by 6th Grade Math on January 27, 2010
57. ## Math

Solve the following equation =0.017=2x^2/(0.0550-x)(0.165-x). I was told it was 0.00196. But I got like 0.00247. Is 0.00196 correct?

asked by John on March 12, 2018
58. ## Math

Complete the table Yards is blank Feet= 29 Inches= 348 Help find yards Help solve

asked by Joel on April 23, 2018
59. ## Math

Solve the equation for x in the interval 0

asked by Diana on January 11, 2010
60. ## trig

Solving Trig Functions: How Do You Solve For Sin 7.5 Using Half-Angle and Double-Angle Identities?

asked by Spy[c] on September 22, 2010
61. ## Math

2. Write a division equation that can be solved by multiplying each side by​ ​9 over 4. Solve the equation to verify your answer.

asked by KAshi on July 18, 2019
62. ## math

Solve the equation algebraically. Round the result to three decimal places. log4 x - log4(x-1) = 1/2 I have no idea how to do this. Please help!

asked by Hannah on September 10, 2009
63. ## Math

solve equation in interval. sec x = -3 -¦Ð ¡Ü x < ¦Ð the answer is x = -1.911 and 1.911 could someone please write the steps to solving this

asked by Amy on September 4, 2011
64. ## Chemistry

32.0=5.5x10^2(1/T)+14.2 Solve for T I am confused about what the first step would be to solving for T. Would I divide 5.5x10^2(1/T) and move it to the left side? Please help.

asked by Maddy on January 28, 2015
65. ## Algebra

32.0=5.5x10^2(1/T)+14.2 Solve for T I am confused about what the first step would be to solving for T. Would I divide 5.5x10^2(1/T) and move it to the left side? Please help.

asked by Maddy on January 28, 2015
66. ## Conic section identification

Explain which conic section this equation and explain how to solve it: 12x^2-18y^2-18x-12y+12=0

asked by saad on August 17, 2011
67. ## math

Please solve -2x+7>22 -2x+7-7>22-7 -2x>15 -2x/(-2)

asked by Anonymous on September 22, 2010
68. ## Math

I'm unsure how to solve this... can someone help me? Match the equation with its graph. −6/7 x - 1/2 y = 3/7 The answers are graphs, so I'll type the coordinates of the graphs here. A.) -1, 4; -6, 4 B.) -1, -4; 4, 6 C.)-4, -6; 4, 8 D.) -4, 6; 2, -4

asked by Abigail on December 10, 2015
69. ## Maths - trig

Solve 3cos2x - 7cosx = 0, when 0

asked by Rose on October 3, 2010
70. ## Chemistry

An alpha particle,4He2+ , has a mass of 4.00151 . Find the value of its charge to mass ratio in C/kg. How do I solve this?

asked by Brittany on September 7, 2011
71. ## pre algebra

When twice a number is decreased by 8, the result is the number increased by 7. How would you solve it and check answer into the original problem?

asked by Amber shall on February 1, 2011
72. ## math

you competed in a 3.9 kilometer race you finished the race in 0.4 hours. which equation can you solve to find your speed, R?

asked by john on October 17, 2009
73. ## math

Einsteins famous formula E=mc^2 relates energy E,mass m and the speed of light c. solve the formula for c.

asked by lisa on March 9, 2013
74. ## Math

How do you solve this equation in numbers five times the diffrence of twice a number and three decreased by the sum of the number and eight equals 13

asked by Bella on July 1, 2017
75. ## statistics

What formula do I use to solve: A sample with a mean of M = 40 and a variance of s2 = 20 has an estimated standard error of 2 points. How many scores are in the sample?

asked by brenda on July 8, 2014
76. ## Calculus

What do you think the appropriate limit is of this sequence? 0.7, 0.72, 0.727, 0.7272,... The answer my textbook gives is 27/99. I have no idea how they got that answer. How do I solve this question?

asked by Anonymous on February 11, 2018
77. ## mathematics

Mr. Collins is buying trsin tickets for \$42 each. What is the total cost of the tickets? Use the distributive property to solve.

asked by alice on December 22, 2012
78. ## algebra

I need help with this question please: Solve the inequality. Give the result in set notation. (If you need to use or –, enter INFINITY or –INFINITY, respectively.) -25 5x < 30 {x | 1 x < 2}

asked by damion on February 1, 2010
79. ## Algebra

ok I believe this is now correct 0 = (m_M r^2)/m_E - r^2 + 2(3.84403 E 8 m)r - (3.84403 E8 m)^2 how do I solve this algebraically where r^2 is the only unkown the physics problem h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2

asked by Jake on December 23, 2009
80. ## math- pre calc/trig

Find the length of each side of a square if the diagonal is 7(square root 2)? How do I solve or set up this problem?

asked by jen on September 30, 2014
81. ## Math

0 Seventy minus the product of 8 and a number is 86. Write the verbal sentence as an equation. Then solve the equation

asked by Jess on August 30, 2018
82. ## Math HELP

Choose the equation you can use to solve the following problem each cupcake cost \$4.00. How many cupcakes,x, are puchased if the total cost is \$36.00 A 4+x=36 B 36-X=4*** C 4X=16 D X/4=36 PLEASE HELP ME

asked by NOICE on November 4, 2018
83. ## Social Studies

What are the causes of problems the Mayas and other Native American groups face in Guatemala? How are people trying to solve these problems?

asked by Candy on June 1, 2015
84. ## physics

an object is moving up and inclined plane its velocity changes from 15 cm\sec to 10 cm\sec in 2 seconds .what is its acceleration solve

asked by Anonymous on July 6, 2012
85. ## Math

To solve a math problem for homework Carrie needed to find the total of 2 3/4 6.00 and 3 4/5 What should Carrie have gotten as an answer? 7.55?

asked by Jerald on November 10, 2012
86. ## trig

How do you solve sin(e^x)=0 for x? The question is "find the smallest number x such that sin(e^x)=0".... but I can't even get AN answer lol! Much appreciated!

asked by Luna on September 11, 2013
87. ## Math

Write and solve an equation for the situation. Eight and one-half years ago, Steven was 7 years old. How old is he now? Explain.

asked by Bell on December 5, 2012
88. ## trig

How do you solve sin(e^x)=0 for x? The question is "find the smallest number x such that sin(e^x)=0".... but I can't even get AN answer lol! Much appreciated!

asked by Luna on September 11, 2013
89. ## Math

Solve: 1.) 2x² + 24 = x² The answers I obtained were: x = i√24 and x= -i√24 are these correct? 2.) 9x³ = 25x 3.) 5x² - x = 7x² - 5x - 2 4.) 2x² = x³ + 4x - 8 ~Thank you

asked by Henry on September 1, 2010
90. ## algebra

Solve each absolute value equation or inequality and choose the correct answer from the choices provided. |x| + 5 = 18 A. 5 or –5 B. 13 or –13** C. 18 or –18 D. 23 or –23 answer **

asked by yeet on October 23, 2018
91. ## Math

Choose the equation you can use to solve the following problem each cupcake cost \$4.00. How many cupcakes,x, are puchased if the total cost is \$36.00 A 4+x=36 B 36-X=4*** C 4X=16 D X/4=36

asked by NOICE on November 4, 2018
92. ## math

Please help me solve this question. Find the value of the annuity. a=1000 I=0.06,n=25? what is the future value of annuity? (round to the nearest cent.)

asked by Sam on April 29, 2013
93. ## conics

Explain which conic section this equation and explain how to solve it: 12x^2-18y^2-18x-12y+12=0

asked by saad on August 17, 2011
94. ## algebra 2

If someone can help me understand this question I'd appreciate it. Solve the following equation. Its a 3x3 matrix that = x^2 first row is 0 0 -1, second row 3 x 0, 2 0 3. Im not quite sure how to find x so i can figure out what x^2 is.

asked by Janet on August 17, 2015
95. ## physics

John runs at 4.6 m/s for 7.53 s along the x axis. How far does John run? Answer in units of m AND What relationship should be used to solve this situation? 1. x = v − t 2. x = v t 3. x = v + t 4. None of these 5. x = v

asked by Sadie on October 22, 2012
96. ## algebra 2

Explain which conic section this equation and explain how to solve it: 12x^2-18y^2-18x-12y+12=0

asked by saad on August 17, 2011
97. ## solving conics

Explain which conic section this equation and explain how to solve it: 12x^2-18y^2-18x-12y+12=0

asked by saad on August 17, 2011
98. ## math

the sum of a numbers is 15 and their difference is 4. form a pair of simultaneous equations and solve to find the numbers.

asked by disha on January 15, 2010
99. ## Advanced Functions

how do i solve this linear inequality equation x+2 divided by 2 greater than/equal to x-2 divided by 4 answer is [-10, infinity)

asked by Anonymous on August 5, 2011
100. ## Maths

Solve the equation 2x-5=7-6x Enter your answer as a fraction in its lowest terms in the box below using / for division. For example, enter as 5/2.

asked by Beth on December 18, 2010