# 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 633
1. ## physics

A 2 kg block, starting from the rest, slides 20 m down frictionless inclined plane, dropping a distance of 10m. The magnitude of the net force on the block while it is sliding is...? How do I solve this problem? And if it were to ask for the speed at the

asked by Anonymous on May 11, 2008
2. ## Math

A sales associate at a computer store receives a bonus of \$100 for every computer he sells. He wants to make \$2500 in bonuses next month. Write and solve an inequality to find the minimum number of computers he must sell.

asked by Juan on March 8, 2016
3. ## geometry

I am having a hard time determining what formula I need to solve the following: On a hexagonal window the height is 1.3m. Find the width.Do I use the pythagreom theorem (but I have only one known number) or do I use the formula 6(1/2as)? I'm confused. The

asked by Cendrillion on August 19, 2010
4. ## social studies

what did the actions of the border ruffians demonstrate about the slavery debate? select all that apply a. that opposing sides would resort to violence b. that abolitionists would triumph by using the press c. that settlers would follow the laws d. that

asked by annie on March 16, 2018
5. ## macroeconomics

a) Suppose the economy is characterized by the following behavioral equations: C = c0 + c1YD YD = Y – T I = b0 + b1Y Government spending is constant. Note that investment now increases with output. Chapter 5 will discuss the reasons for this relation.

asked by Eve on March 19, 2007
6. ## Chemistry

Hello, how would I solve this question? I tried solving it, but I got 109% as my answer which seems incorrect. This is the question: 4FeCr2O4(s) + 8K2CO3(aq) + 7O2(g) → 2Fe2O3(s) + 8K2CrO4(aq) + 8CO2(g) . 4.0 g of FeCr2O4 and 6.0 g of K2CO3 were reacted

asked by Anonymous on September 14, 2018
7. ## Calculus

I can do the Ferris Wheel type. This one I can not solve. A light is attached to a 13 inch radius bicycle tire, at a point 8 inches from the center. If Harvey rides the bike at 15 mph, how fast is the light moving up and down at its fastest?

asked by Reggie on December 4, 2012
8. ## Biology/English

I read The Andromeda Strain and I have to make an outline of the scientific method using Examples from the book. This is what I have so far: ASK- "What killed all the people in Piedmont"? RESEARCH- When they released the germ into the cage with the mouse

asked by Anonymous on August 11, 2010
9. ## statistics

a the gym i notice women tend to work out together more then men. males together at gym 5 alone 7 women alone 6 together 6 what statistical test should i use what is the Ha and Ho what is the appropriate analysis and should the Ho be rejected

asked by dave on June 25, 2012
10. ## Algebra II

Two cards are drawn from a standard deck of cards. Find the probability that a king or a red card is drawn. Work: 4/52 + 26/52=30/52 or 15/26 Is this correct? Thanks

asked by Lucy on March 30, 2008
11. ## chemistry

what is the mass of bromine contains the same number of atoms of 50.0 g of iodine? my work: 50g/79.5g= .628 mol(Br) 50g/126g=.394 mol(I)

asked by fatima on November 4, 2015
12. ## Maths

Colin walked a distance of 15 miles in 6 hours Work out Colin's average speed Give your answer in miles per hour

asked by Fatima on June 2, 2019
13. ## Graphing Circles - Finding the radius

A circle is tangent to the y-axis at the point (0,2) and passes through the point (8,0). Find the radius of the circle. I tried using distance formula but it doesnt work? Help please thanks.

asked by Knights on March 10, 2013
14. ## maths

during a week a student spends 1/5 of her time in bed,1/8 of her time doing home work and 2/5 of her time in lessons.What fraction of her time is left for doing other things?

asked by leo on February 8, 2016

You roll a number cube 20 times. The number 4 is rolled 8 times. What is the experimental probability of rolling a 4? A. 40% B. 25% C. 20% D. 17% How do I work this problem out? Please explain. Thank you.

asked by Lily Longoria on May 13, 2016
16. ## civil enginerring

air having a pressure of 40 psig and a volume of 8 cu ft expands isotermally to a pressure of 10 psig find the external work performed during the expasion

asked by john on March 13, 2011
17. ## Algebra 2

Q: (x^2-9/x^2-5x)(5x-x^2/x^2-x-12)(x^2-8x+16/x-4) my answer: -1 How i solved: crossed multiplied 2 of the 3 sets of fractions the multiplied the answer to the remaining one and simplified. Can you check that my work is correct?

asked by Bryan on March 21, 2016
18. ## calculus

A spring exerts a force of 4x lbs when it is compressed a distance of x feet. How much work is required to compress the spring a distance of one inch?

asked by sam on December 1, 2011
19. ## calculus

A spring exerts a force of 4x lbs when it is compressed a distance of x feet. How much work is required to compress the spring a distance of one inch?

asked by Anonymous on April 17, 2011
20. ## physics

A hallway display of energy is constructed in which several people pull on a rope that lifts a block 1.15 m. The display indicates that 1.05 J of work is done. What is the mass of the block?

21. ## physics

A hallway display of energy is constructed in which several people pull on a rope that lifts a block 1.15 m. The display indicates that 1.05 J of work is done. What is the mass of the block?

22. ## Algebra I-

(solving for x) 3(x+5)=6x-4+7(-7x-1) Each time I try this i plug the numbers in and i find out that i am worng. Please help! I get -13/23 but I didn't check it. Post your work if you want me to check it and find your error.

asked by Victor on January 21, 2007
23. ## Physics

The coefficient of kinetic friction between a suitcase and the floor is 0.272. If the suitcase has a mass of 90.0 kg, how far can it be pushed across the level floor with 700 J of work?

asked by Angela on October 5, 2010
24. ## physics

A block of mass M=1.0 kg is dragged over a horizontal surface by a force F=20.0N. The block is displaced a distance d=10.0 m, the friction force Ff is 5.0 N. What is the work done by the weight Fg?

asked by Elisabeth on September 15, 2011
25. ## Geometric progression

sum of 4 terms of g p is 30 & sum of first and last term is 18 . Find gp a(r^4-1)/(r-1) = 30 a + ar^3 = 18 a(1+r^3) = 18 it's easy to see that if a=2, r=2 Does that work on S4? 2*15/1 = 30. Yes So, the GP is 2,4,8,16,... But sir I want not logic proof ,

asked by Venkatesh on March 23, 2016
26. ## African American 1930's

During Christmas dinner (1930's), did African American's have a limited supply of dishes, (African Americans who had to work in the fields)? Could you name some dishes they had?

asked by Anonymous on May 17, 2010
27. ## algebra

Describe two laws of exponents and provide an example illustrating each law. Explain how to simplify your expression. How do the laws work with rational exponents?

asked by kelley on November 18, 2010
28. ## algebra

a student works no more than 25 hours each week at a part-time job. what would be the inequality that represents how many hours the student can work each day?

asked by Ashlynn on February 18, 2016
29. ## Physics

Mandy picks up a 25 N book from the floor to a height of 0.50m. How much work does Mandy do? (Hint use w=mg to find the force necessary to move the book)

asked by Jennifer Tran on April 8, 2013
30. ## To Ms.Sue

Why did you create this website in the first place? And did you make this or did someone else make it? Do you just answer questions at your home? I know your a retired teacher but don't you still work? I have so many questions.

asked by GYMNAST on October 20, 2017
31. ## Physics

How much work must be done to increase the speed of an electron (a) from 0.18c to 0.19c and (b) from 0.98c to 0.99c? Note that the speed increase is 0.01c in both cases.

asked by Brian on December 12, 2012
32. ## Maths

Here is a list of what you need to make 20 buns: - 100g butter - 150g flour - 200g sugar - 4 eggs Work out what you need to make 30 buns Please help. Thank you x

asked by anonymous on April 3, 2015
33. ## physics

A 0.579 kg basketball is dropped out of a window that is 6.22 m above the ground. The ball is caught by a person whose hands are 1.31 m above the ground. How much work is done on the ball by its weight?

asked by Sam on January 25, 2012
34. ## physics

Two forces parallel to the x-axis do 14.7 J of work on a small tray while moving it 20.7 m in the x direction across the gym floor. One of the forces has a value of +3.89 N in the x direction. What is the other force?

asked by Anonymous on January 26, 2017
35. ## physics

The physics of moving a small charge through a potential difference. How much work is needed to move a -8.0 ìC charge from ground to a point whose potential is +75 V?

asked by aly on April 28, 2011
36. ## chemistry

Calculate the amount of heat required to heat a 3.5 kg gold bar from 21 degrees C to 37 degrees C. What would be the best way to work this problem? I don't know if I need to convert the kg to g.

asked by Raene on September 3, 2018
37. ## Math

Mr. Bailey mowed his yard in 90 minutes. His son Roy mows the yard in 75 minutes. How long will it take them if they work together (using 2 lawn mowers)?

asked by John on March 4, 2014
38. ## Math

My home work asks "what is the five number summery of a datta set? How is it used to mAke a box plot?" But i frogot what a five number summery is please help.

asked by Magiemay on April 25, 2013
39. ## ALGEBRA

Lines A and B are perpendicular and have the same x-intercept. The equation of line A is x + 2y - 4 = 0 . Determine the y-intercept of line B. A.-8 B.-2 C. 4 D. 8 This is the work that I did: x + 2y - 4 = 0 +4 +4 x+2y = 4 -x -x 2y = -x+4 divide both sides

asked by Anonymous on January 19, 2011
40. ## chemistry

Calculate the amount of heat required to heat a 3.5 kg gold bar from 21 degrees C to 37 degrees C. What would be the best way to work this problem? I don't know if I need to convert the kg to g.

asked by Raene on September 3, 2018
41. ## Algebra

Please confirm if I did the follow problems correctly: A) Find the sum or difference. (5a – 3b) + (2a + 6b)= 7a + 9b Answer: = 7a + 9b B) Let’s work a few of these (FOIL) 1) (x+2) (x+8) = x 10 Answer: x10 2.) (x+5) (x-7) = x + 11 Answer: x + 11 3.)

asked by Jeannie on April 3, 2011
42. ## com150

whcih article did you choose. I choose how telephones work . What type of introduction does the writer use? what is the impact of that kind of introduction in this essay.

asked by lynn on July 6, 2008
43. ## Math

Ella babysits for 3/4 hour before school each morning. a) How many hours does she babysit in a 5- day work week? b) How many hours does she babysit in 4 weeks?

asked by Cherie on October 19, 2012
44. ## physics

A 25.0 kg pickle is accelerated from rest through a distance of 6.0 m in 4.0 s across a level floor. If the friction force between the pickle and the floor is 3.8 N, what is the work done to move the object?

asked by steve on November 6, 2011
45. ## physics

a .300 kg baseball is thrown at a speed of 6.5m/s. the batter hits the ball and it flies into the outfield at a speed of 19.2 m/s. How much work is done into hitting the baseball

asked by jay on January 22, 2012
46. ## physics

A 0.579 kg basketball is dropped out of a window that is 6.22 m above the ground. The ball is caught by a person whose hands are 1.31 m above the ground. How much work is done on the ball by its weight?

asked by Jen on January 22, 2012
47. ## Physics

A block of mass M=1.0 kg is dragged over a horizontal surface by a force F=20.0N. The block is displaced a distance d=10.0 m, the friction force Ff is 5.0 N. What is the work done by the weight Fg?

asked by Elisabeth on September 13, 2011
48. ## Math

an irrigation pump can do a job 3 times faster than another. If the y work together it takes 9 hours to complete the job. How long would it take the larger pump by itself

asked by Pat on October 20, 2016
49. ## physics

need help quick: Magen's mass is 25 kg. She climbs the 4.5-m ladder of a slide, and reaches a velocity of 3.0 m/s at the bottom of the slide. How much work was done by friction on Magen?

asked by Steve on December 1, 2011
50. ## 11 grade / physics

find the work by a body which is moving with a velocity of 10m/s and after covering some distance it has the velocity of 20m/s mass of the body 100kg

asked by ajay on May 11, 2017
51. ## math

it takes 35 minutes for mr morrison to drive 25 miles to work. rounded to the nearest mile per hour, what is the speed in miles per hour?

asked by misty on February 2, 2011
52. ## Algrebra

Please confirm if I did the follow problems correctly: A) Find the sum or difference. (5a – 3b) + (2a + 6b)= 7a + 9b Answer: = 7a + 9b B) Let’s work a few of these (FOIL) 1) (x+2) (x+8) = x 10 Answer: x10 2.) (x+5) (x-7) = x + 11 Answer: x + 11 3.)

asked by Jeannie on April 3, 2011
53. ## economics

Let U(x; y) = 5x:8y:2 showing all derivation work, find: (a) the Marshallian demand functions for x and y (b) the Indirect Utility Function (c) the compensated demand functions xc and yc

asked by Anonymous on February 21, 2014
54. ## algebra

simplify the expression. Use only positive exponents. 8x^2y^-2/x^-2y * (4xy^2)^-1/x^2y Something does not seem right in your terms. Are you saying that 8x is being taken to the 2y power and that all this being taken to the -2x power? Please clarify your

asked by kayla on March 7, 2007
55. ## Physics 1

A 0.620 kg basketball is dropped out of a window that is 6.40 m above the ground. The ball is caught by a person whose hands are 1.61 m above the ground. How much work is done on the ball by its weight?

asked by Fallon on May 5, 2010
56. ## physics

A block of mass 3.90 kg is pushed 3.80 m along a frictionless horizontal table by a constant 16.0 N force directed 24.0° below the horizontal. What is th total work done on the block?

asked by gabe on October 25, 2010
57. ## science

calculate the velocity of a car increases from 54km 1hr to 72 km/hr if the mass of the car is 1500kg find the work done to increase the velocity

asked by sejal on March 31, 2016
58. ## Physics

A skateboarder with a mass of 68.6 kg and a speed of 4.92 m/s coasts across a parking lot. After coasting for 35.0 m the skateboarder has a speed of 1.12 m/s. How much work has been done against friction? a) 338 J b) 76.8 J c) 7.5 J d) 787 J

asked by Kennedi on January 14, 2017
59. ## math

I have a question is this cheating when we ask questions from our school work ? Wouldn't our on line school know we are kids are doing this ? What is an ethical homework question ? Curious..

asked by Molly on February 2, 2013
60. ## physics

A hallway display of energy is constructed in which several people pull on a rope that lifts a block 1.10 m. The display indicates that 0.85 J of work is done. What is the mass of the block?

asked by skylar on January 11, 2012
61. ## physics

How long would it take a 750W electric motor to do 1.5x10^5 of work What I have so far: So we know w=fappxd 1.5x10^5=750xd So we can arrange that to find d. And then maybe use a formula to find t? Thank you!!

asked by amy on March 30, 2017
62. ## Spanish 1

(Darme) a cuchara. I am supposed to replace Darme with the mandate form of the word. I replaced it with dénme, but that didn't work. What is the right form?

asked by Mary on December 8, 2011
63. ## physics

a motor pumps water from a depth 0f 6meters. f it pumps 100kg of water in one minute with a velocity of 10m/s. calculate the work done

asked by afsal on December 25, 2011
64. ## Algebra

Write the equation of the line L satisfying the given geometric conditions. L has y-intercept (0,-3) and is parallel to the line with equation y=2/3x+1 I will be happy to critique your work on this. y=(2/3)x-3?

asked by Linda on May 20, 2007
65. ## Science

How much work is done on the trolley by the force,if the force applied is 200N at an angle of 37 degrees to the horizontal and the trolley moves a distance of 10m.

asked by ANNAH on May 1, 2014
66. ## Chemistry

The work function for a certain metal is 3.00 eV. Calculate the speed of the electrons in m/s ejected by light of wavelength 209 nm. If it is not ejected, report a speed of 0.0.

asked by Austin on February 7, 2018
67. ## Physics

A tennis player hits a 58.0g tennis ball so that it goes straight up and reaches a maximum height of 6.17m. How much work does gravity do on the ball on the way up? On the way down?

asked by Carmen on November 11, 2010
68. ## PHYSICS*****

Two forces parallel to the x axis do 18.1 J of work on a small tray while moving it 21.8 m in the x direction across a gym floor. One of the forces has a value of +3.69 N in the x direction. What is the other force?

asked by Steve on March 21, 2012
69. ## physics

A boy pushes a book by applying a force of 40N.Find the work done by the force ,if the book is displaced by 25cm along the path.

asked by Anonymous on October 30, 2011
70. ## math

A fireman stood in the middle of a step ladder. He climbed down 4 steps and continued his work. He went down 8 more then back up 9 to the top. How many steps were on the ladder?

asked by Lauren on February 7, 2011
71. ## physics

A pump is required to lift 800 liters of water per minute from a well 15.0 m deep and eject it with a speed of 17.0 m/s. How much work per minute does the pump do?

asked by tom on July 19, 2010
72. ## Physics

Two forces parallel to the x axis do 17.2 J of work on a small tray while moving it 19.0 m in the x direction across a gym floor. One of the forces has a value of +3.93 N in the x direction. What is the other force?

asked by Jacob on October 14, 2014
73. ## physics

A boy pushes a book by applying a force of 40N.Find the work done by the force ,if the book is displaced by 25cm along the path.

asked by Anonymous on October 30, 2011
74. ## Domestic Violence

Which of the following is an example of violence against women in the family? A. Forced prostitution B. Dowry-related violence C. Sexual harassment at work D. Trafficking in women is it A

asked by Amy on January 5, 2016

The difference in potential between any two points in a field is the ___ required to move a unit of whatever is affected by the field between the two points. I need help with this. Could it be work? or energy? Please help

asked by Sejul on April 10, 2011
76. ## physics

A 0.620 kg basketball is dropped out of a window that is 6.40 m above the ground. The ball is caught by a person whose hands are 1.61 m above the ground. How much work is done on the ball by its weight?

asked by Fallon on May 11, 2010
77. ## Math

A student thinks the sum of 4.3 and 8.4 is 12.7 because 4+8= 12 and 3+4=7. The student then adds 3.7 and 2.6 and gets 5.13 because 3+2=5 and 6+7=12 Identify the mistake in the students procedure and explain why the procedure wont always work

asked by Anonymous on January 11, 2016
78. ## algebra 2

There are twenty songs from which a disc jockey can chose five to play on her program. How many different arrangements of songs are possible for the program? Please check my work 20x19x18x17x16

asked by Thomas on May 21, 2010
79. ## physics

A boy pushes a book by applying a force of 40N.Find the work done by the force ,if the book is displaced by 25cm along the path.

asked by Anonymous on October 30, 2011
80. ## physics

A 15.0-kilogram mass is moving at 7.50 meters per second on a horizontal, frictionless surface. What is the total work that must be done on the mass to increase its speed to 11.5 meters per second?

81. ## physics

Due to a tune-up, the efficiency of an automobile engine increases by 4.00%. For an input heat of 1530 J, how much more work does the engine produce after the tune-up than before?

asked by S on December 4, 2014
82. ## Calculus

Could someone work this out so I understand it. Thanks Given the supply function p=S(x)=5(e^0.02x-1) Find the average price (in dollars)over the supply interval [31,36] The 0.02x in the only thing ^ on the e

asked by Jay on April 25, 2011
83. ## Physics

A toddler applies a 25.0 N force to a chair over a distance of 2.5 m, the chair is being pushed across a smooth floor against a force of friction (10.0 N resistance). How much work is being done?

asked by Ryan on June 11, 2017
84. ## Physics !! Help Needed UrGeNtLy!!

A toddler applies a 25.0 N force to a chair over a distance of 2.5 m, the chair is being pushed across a smooth floor against a force of friction (10.0 N resistance). How much work is being done?

asked by Ryan on June 11, 2017
85. ## Algebra

Describe two laws of exponents and provide an example illustrating each law. Explain how to simplify your expression. How do the laws work with rational exponents?

asked by Sam on December 8, 2010
86. ## physics

Suppose you moved a box across a rough horizontal surface with a 50 N force over a displacement of 10 m. If the frictional force at the interface was 10 N, how much work was done to the box?

asked by Mary on July 7, 2015
87. ## Physics

A hill is 290 m long and makes an angle of 10 degrees with the horizontal. As a 68 kg jogger runs up the hill, how much work does gravity do on the jogger?

asked by Casey on December 16, 2010
88. ## math

you want to use a square section of your yard for a garden. You have at most 52 feet of fencing to surround the garden. write and solve an inequality to represent the possible lengths of each side of the garden. Math - Dylan, Tuesday, March

asked by Sweg Man Jones on February 22, 2017
89. ## ELECTRICITY AND MAGNETISM

a dust particle with mass =5.0*10-9 kg and charge q =2.0nC starts from rest at point a and moves in a straight line from a to the point b ! what is its speed V at point b? please some on SOLVE it and send me ON my emial after got solved pleaseee ?

asked by sufyan khalil on October 29, 2011
90. ## Physics

A car weighs 15000-N and is traveling along a highway at 27 m/s. If the driver immediately applies his brakes and the car comes to rest in 85 m, what net force acts on the car during its acceleration? How do you solve this to get an answer of -6564N?

asked by ihatephysics on December 22, 2010
91. ## Physics

A player throws a ball at an initial velocity of 36 m/s. The maximum distance the ball can reach (assume ball is caught at the same height at which it was released) is? (I tried to solve it but i think it doesn't have all the information needed to slove

asked by Yass on October 9, 2015
92. ## algebra

Why does the inequality sign change when both sides are multiplied or divided by a negative number? Does this happen with equations? Why or why not? Write an inequality for your classmates to solve. In your inequality, use both the multiplication and

asked by Anonymous on November 30, 2009
93. ## Chemistry

An electron ps from the 6th to te 3rd energy level in the hydrogen atom: a) calculate the wavelength b) calculate the frequency c) calculate te enrgy d) into which spectral series would the photon be grouped? (i really just need to formulas, then i could

asked by Ella on May 23, 2011
94. ## physics

A crate of mass 97 kg is loaded onto the back of a flatbed truck. The coefficient of static friction between the box and the truck bed is 0.26. What is the smallest radius of curvature (in m) that the truck can take, if the speed with which it is going

asked by Becky on October 4, 2010
95. ## Discrete Math

Solve the recurrence relation a_n = -2a_n-1 + 15a_n-2, n ≥ 2, given a₀ = 1, a₁ = -1. x² + 2x - 15, the distinct roots 3 and -5, so a_n = C₁(3^n) + C₂(-5)^n. The initial condition gives a₀ = 1 = C₁ - C₂, a₁ = -1 = 3C₁ - 5C₂. We obtain

asked by Francesca on April 5, 2011
96. ## Math

I have no idea what is the first step in the question. Please solve it for me. Following is the question relating to the chapter i.e. Vectors in two dimensions: {1} If a= (p+q p), b= (3 q+1) and a=b, find the values of p and q. NB: The bracket of a and b

asked by Ahmed on July 31, 2009
97. ## Pre-caluclus

I do not know how to solve for y to get the inverse of this question: The number of elephants in a park is estimated to be P(t)=7500 1 + 749e^(−0.15t) where t is the time in years and t = 0 corresponds to the year 1903. Find the inverse of P(t). What is

asked by Anonymous on September 30, 2014
98. ## math-law of sins

solve the triangle: 1. A= 61 degrees a=8 b=21 2. A=136 degrees a=15 b=28 3. C=115 degrees b=12 c=7 For all of these problems I used law of sins and when I input it into my calculator I get domain error after doing sin inverse to get an angle degree. What

asked by skye on August 2, 2012
99. ## Algebra

Solve the given polynomial equation. Use the Rational Zero Theorem and​ Descartes's Rule of Signs as an aid in obtaining the first root. 2 x cubed minus 5 x squared minus 5 x minus 1 equals 02x3−5x2−5x−1=0

asked by Karla on November 11, 2016
100. ## physics

A typical steel B-string in a guitar resonates at its fundamental frequency at 240 Hertz. The length of the string is 0.620 m. What is the wave velocity along the string? Find your answer in m/s. What is the formula to solve?

asked by Student in Need on March 29, 2011