# 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 685
1. ## physics

a man pulls a log of mass 45 kg along level ground by means of a rope at constant speed. If the applied force is at an angle of 30 degrees to the horizontal and the force of friction is 36N find the work done by him pulling the log through a distance of

asked by maham on May 12, 2013
2. ## Health

This can be C. OR D. couldn't it be? A second hand statement? Dang! or even B. Keep running this through my head Which one of the following statements is an example of hearsay? A. I saw the doctor administer the injection. B. I checked the patient’s

asked by Jessica on July 6, 2010
3. ## Production and Operations management

A ball bearing assembly firm wants to set up an assembly line which must have an output of 60 units per hour. The work elements are A to J and the task times are 40, 30, 50, 40, 6, 25, 15, 20, 18 and 30 seconds respectively. a. Determine the cycle time

asked by Special on July 6, 2010
4. ## Chemistry(I'm sooo confused here!)

The Rydberg equation, with n1=1, predicts an ultraviolet series of spectral lines of atomic hydrogen. Which of the following wavelengths is not predicted by the equation: 1/ = (1.097 x 10(7) m - 1) x (1/n1(2)-1/n2(2) a)182 nm b)103 nm c)97 nm d) 95 nm e)

asked by lavonne on November 4, 2010

read my essay and tell me if its good Industrialization, which followed the Civil War, had a big impact in the United States. The workers suffered a great deal. They worked hard and lived in poor conditions. Children also suffered; children had no

asked by ANAIS on February 28, 2007
6. ## economics

which of these is most likely favored by both management of labor? a. an increase in wages b.cutbacks in health coverage due to rising health care costs c. establishment of a profit sharing plan d. guarantees against layoffs e. new work rules to increase

asked by Frances on January 20, 2011
7. ## Math - Logarithmic

Log_8 = Log with the base of 8 log_8 (x-3) - log_8 (3x+11) = log_8 [1 / (x+1)] I use the quotient law for the left side and eliminate log_8. And then what? My Work: log_8 [(x-3)/(3x+11)] = log_8 [1 / (x+1)] [(x-3)/(3x+11)] = [1 / (x+1)] Answer: 7

asked by Anonymous on December 12, 2007
8. ## PChem

For the gas phase reaction 2NO2 + F2 ¨ 2NO2F, the rate constant is k= 38 dm3/mol-s at 27 oC. The reaction is first-order in NO2 and first-order in F2. A) Calculate the number of moles of NO2, F2, and NO2F after 10.0 s if 2.00 mol of NO2 is mixed with

asked by Debora on December 9, 2014
9. ## Algebra

Divide using long division or synthetic division. (21x^3 - 7)/(3x - 1) Just wondering, how would you solve this problem using synthetic division?

asked by Jule on October 26, 2007
10. ## algebra

i am supose to graph this using three points on a graph how am i suppose to find three points for this problem x

asked by TAMMY on May 2, 2007
11. ## math question

/how do i solve this? The probability of winning a game is 15%. If you play 20 times,how many times should you expect to win? A.5 times B.3 times C.6 times D.15 times

asked by matt on June 5, 2014
12. ## Math

Solve 0.6^x < 0.8 So here's what I did: x log0.6 < log 0.8 x < log 0.8/ log 0.6 x < 0.437 But that's not the correct answer, it's: x > 0.437 Can someone explain why it changes < from to > ? Thanks in advance!

asked by Clueless on February 28, 2019
13. ## math

There are some caps in a box. 1/6 of them are red, 1/3 of them are blue and 3/7 of the remainder are green. If there are 27 green caps, how many caps are there altogether? How should I solve this?

asked by Claire on December 3, 2015
14. ## geometry

Given that Vector BD Angle ABC, Measures Of Angle ABC =6x - 12, And Angle = 72 Degres, Which Equations Could Be Used To Find The Value Of X? A - 6x - 12 = 72 B - 1/2 (6x-12) = 72 C - 2(6x - 12 = 72 D 6x - 12= 2(72) Can Anyone Help Me How To Solve Or Help

asked by jacob on September 2, 2011
15. ## AP Calculus BC

Hi! Thank you very much for your help--- I'm not sure what the answer to this is; how do I solve? Find antiderivative of (1/(x^2))[sec(1/x)][tan(1/x)]dx I did integration by parts and got to (1/(x^2))[sec(1/x)] + 2*[antiderivative of (1/(x^3))(sec(1/x))dx]

asked by APpreciative student on November 23, 2010
16. ## Algebra

Divide using long division or synthetic division. (21x^3 - 7)/(3x - 1) Just wondering, how would you solve this problem using synthetic division?

asked by Jule on October 26, 2007
17. ## algebra 1

This problem has a fraction in it. Solve: square root of y =(numerator) 5+square root of 2. (Denominator)2 25.5+5square root of 2?

asked by Lily on August 30, 2010
18. ## math

Angles A and B are supplementary angles. Find the measure of each angle if angle A is 30 degrees greater than angle A. How do I solve this?

asked by Sally123 on September 5, 2018
19. ## Algebra

Solve for "x" in each equation. 1)xsquared+12x+25= 0 2)xsquared+4x-12= 0 3)xsquared-5x= 50 4)(x+1)squared= 169 5)2xsquared+5x= 12 6)(2x-5)squared= 225 7)x-4/x-3 = x+2/x+1 8)9/2x+1/3= 1/2 9)6/x-1= 3/x 10)2x/2x+2x= 4

asked by Cute on October 9, 2013
20. ## college algebra--need help please!!

solve the following exponential equation. use exact answers only. not sure how to put it into the equation but it is 2 then 1-9x where the 1-9x is above the 2=e2x where the 2x is above the 2. Can someone tell me or explain to me how to put this equation

asked by Heather on November 24, 2012
21. ## science

Bacteria are invisible to humans except under a microscope. Which evidence did Pasteur use to show that bacteria were the cause of soured wine? A. Heated wine did not sour B. Capped wine did not sour C. Filtered wine did not sour D. Chilled wine did not

asked by PLZZ Help on January 26, 2015
22. ## Science / Physics

A vehicle is traveling west with a momentum of 1,800 kg•m/s. A second vehicle is traveling east with a momentum of 1,200 kg•m/s. The vehicles collide. What is the total momentum of the system after the two cars collide? A. 600 kg•m/s westward B.

asked by Klauus on May 10, 2019
23. ## Accounting

I am working on a problem that wants me to make a balance sheet and income statement for the Argo Sales Company based on some information given that I have no idea how to compute. I have been able to figure out how to do a ratio correctly if I am given the

asked by Rene on May 21, 2008
24. ## world his

Describe the major classical period trading patterns within and among China, India and the Mediterranean? The major classical period trading patterns within China, India and the Mediterranean are: Expanded territory – added southern rice valley Feudal

asked by Anonymous on September 5, 2009
25. ## Chemistry

The pH of a 0.100 M solution of an aqueous weak acid (HA) is 4.00. What would the Ka for the weak acid be?

asked by Grace on April 16, 2012
26. ## chemistry

how many moles of sodium chloride are in 937 mL of a 1.88 M solution of sodium chloride?

asked by Randy on April 29, 2012
27. ## chemistry

Find volume (in ml) of 0.3 M solution of sodium chloride containing exactly 3.0g of sodium chloride.

asked by Allison on March 10, 2015
28. ## Chemistry

Given 1.01 g of H2 in the reaction H2 + 1/2 O2 = H2O. The Delta H for solution is 143 kJ. What is the delta H for the reaction?

asked by Roger on October 20, 2012
29. ## math 7

When 3n is divided by 7 the remainder is 4. What is the remainder when when 2n is divided by 7? (With solution pls...) tnx

asked by MNHS_MNHS on January 13, 2014
30. ## chemistry

How many grams of Sodium chloride are in 53.2 g of solution that is 0.50% by mass sodium chloride?

asked by Aamnda on December 4, 2011
31. ## Science

What is the approximate value of the solution after 1.75 if it is 19 degree celcius at 1.5 and 24 degree celcius at 2.0 minute?

asked by Alisha on September 7, 2008
32. ## chemistry

Please calculate the pH and [H+] of a 0.30 mol/L solution of butanoic acid,. The Ka of butanoic acid is 1.52 x 10^-5

asked by Ross on April 7, 2008
33. ## chemistry

How many moles of sodium chloride are in 711 mL of a 2.01 M solution of sodium chloride

asked by Anonymous on November 17, 2013
34. ## Algebra

Determine whether the given numbers are solutions of the inequality. y-8>2y-3 4, -11, -19, -1 (are any of these numbers a solution to the inequality?)

asked by Ann on June 9, 2011
35. ## chemistry

if 25.00 mL of 1.04 M Na2CO3 is diluted to .500 L, what is the molarity of Na2CO3 in the diluted solution?

asked by England on September 6, 2012
36. ## Chemistry

The Ka value for ethanoic acid is 1.8x10^-5, what would be the pH of a 2.0x10^-2 M solution of ethanoic acid?

asked by Rachael on February 27, 2011
37. ## Chemistry

The Ka value for ethanoic acid is 1.8x10^-5, what would be the pH of a 2.0x10^-2 M solution of ethanoic acid?

asked by Rachael on February 27, 2011
38. ## Algebra 1

If x is greater then or equal and y is greater then or equal to 0 then which quadrant holds the solution?

asked by Steve on December 20, 2014
39. ## college chemistry

How many milliliters of a 9.0\% ({\rm v/v}) propyl alcohol solution would you need to obtain 4.0{\rm mL} of propyl alcohol

asked by chloe shaw on November 12, 2012
40. ## Chemistry

a chemist wants to make 5.5L of a .3M Cacl2 solution. What mass of CaCl2 should the chemist use?

asked by Charessa on February 9, 2014
41. ## Math

What is the solution of 1/3 + 3/10 + 1/5? Hi, I don't really know how to add fractions very well yet. Can you explain how to add these 3 fractions? Thanks so much

asked by Questioner on March 6, 2015
42. ## science

How many molecules of stearic acid are present in 2.00 mL of a 0.25 mM solution of stearic acid?

asked by sammy on December 15, 2010
43. ## C

A solution contains 19.0 g of NH4Cl in water and is 9.10% NH4Cl. What is the mass of water present?

asked by Anonymous on October 28, 2016
44. ## chemistry

In a saturated solution of Al(OH)3 the concentration of OH^1- is 2.6 x 10^5 mol/L. The concentration of Al3+ in mol/L is what?

asked by Jennifer on April 1, 2008
45. ## Science

How many grams of Sodium chloride are in 53.2 g of solution that is 0.50% by mass sodium chloride?

asked by Josh on May 2, 2017
46. ## chemistry

how much copper sulfate do i need to make a solution of 100ml of 1M copper sulfate?

asked by johnny on April 30, 2015
47. ## math

Classify each statement as sometimes, always, or never true. A. 2^(2/3)*4^(4/3)=8*2^(1/3) B. If x>0, then (squareroot x*squareroot 2)^3 =x^(3/2) 2^(3/2) C. If x>0, then (squareroot x+ squareroot 2)^3 =x^(3/2) 2^(3/2) D. The only solution to x^(2/3)= 4 is

asked by hannah on March 24, 2013
48. ## chemistry

If you have 1.00 M sodium chloride solution, and you have 300. mL of it, how many grams of sodium chloride are there?

asked by a on May 15, 2018
49. ## Chemistry

I need someone to check these True or False questions for me please: 3. Dissolving salt in water is a physical change- F 14. Burning newspaper is a physical change- F 19. The liter is a measure of volume- T 20. The amount of heat and temperature of a

asked by mysterychicken on October 19, 2010
50. ## Math

particle P of mass m kg is attached to two fixed points A and B by two identical model springs, each of stiffness k and natural length l . The point A is at a height / l above the point B. The particle is free to oscillate vertically under gravity. The

asked by John on March 31, 2017
51. ## physics - relative motion

A ferryboat, whose speed in still water is 4.00m/s, must cross a river whose current is 3.00m/s. The river runs from west to east and is 128m wide. The boat is pointed north. a) If the boat does not compensate for the flow of the river water and allows

asked by Leo on December 18, 2012
52. ## Physics

A pinball machine uses a spring that is compressed 4.0 cm to launch a ball. If the spring constant is 13 N/m, what is the force on the ball at the moment the spring is released? I don't understand this I guess... Does the ball leave the spring at the

asked by HELP ME! on May 16, 2009
53. ## Physics

A block of mass m lies on a rough plane which is inclined at an angle è to the horizontal. The coefficient of static friction between the block and the plane is ì. A force of magnitude P is now applied to the block in a horizontal direction, towards the

asked by Anonymous on May 13, 2012
54. ## Physics

how are the fundamental laws and principles of physics related to the complexity that we see in nature? 2) How do the laws of physics apply to other sciences such ad biology, chemistry, and earth science? Give a specific example to show the connection - is

asked by anonymous on September 13, 2015
55. ## Algebra

Hiya! I have a function here: y = x^2 - 4x - 32 I have some questions about it. 1. I think this parabola opens up. Am I correct? Can you explain how you know weather it opens up or down? 2. Can you tell me what the axis of symmetry and the vertex of this

asked by Student on February 28, 2014

You decide to buy a new home for $101000.00 at 7.5% interest rate. You feel that you can afford$800.00 for a mortgage payment. You make a down payment of $10000.00 How much will you still owe after making payments for one year. Show the mortgage payment asked by Sam on May 21, 2015 57. ## chemistry draw a diagram of the water molecule. then draw where the electrons are to show it's covalent. so does that mean its lewis structure, which would be: .. H- O -H .. but where would the electrons go? Many pictures of H2O here: asked by maurice on June 10, 2007 58. ## Statistics According to the record of the registrar's office at a state university, 35% of the students are freshman, 25% are sophomore,16% are junior and the rest are senior. Among the freshman, sophomores, juniors and seniors, the portion of the students who live asked by Myda on November 13, 2016 59. ## structured query language math Display a list of all instructors, showing their ID, name, and the number of sections that they have taught. Make sure to show the number of sections as 0 for instructors who have not taught any section. Your query should use an outerjoin, and should not asked by joe on July 23, 2011 60. ## Math an = 3n - 1 Answer 2, 3, 4, 5 2, 5, 8, 11 -2, -5, -8, -11 4, 7, 10, 13 3 points Question 2 Write the first four terms of the sequence whose general term is given. an = 2(2n - 3) Answer -6, -2, 2, 6 -1, 1, 3, 5 -2, -4, -6, -8 -2, 2, 6, 10 3 points Question asked by Tony on July 17, 2012 61. ## social studies 1. The admission of Missouri as a slave state was controversial in the Senate because the Senate was pro-slavery. it would create sectionalism. it would upset the balance.*** the Senate was anti-slavery. 2. The main topic of the Lincoln-Douglas debates was asked by TTR+S<3 on April 21, 2014 62. ## math On a recent day, 8 euros were worth$9 and 24 euros were worth 24 euros were worth $27. Write an equation of the form y=(k)x to show the relationship between the number of euros and the value in dollars. Where y is dollars and x is euros. I got y=.89x am I asked by Samantha on November 2, 2015 63. ## Visualizing spots Question: A colorless unknown substance is spotted on a TLC plate and developed in the correct solvent. The spots do not appear when visualization with a UV lamp or iodine vapors is attempted. What could you do to visualize the spots if the compound is the asked by Sheryl on October 15, 2006 64. ## Social Studies (Check, Please!) 1. In what ways did the Taft-Hartly Act hurt labor unions? A: The Taft-Hartley Act hurt labor unions in many ways. First, it outlawed the closed shop, of the practice of forcing business owners to hire only union members. Secondly, it outlawed Union shops asked by Victoria on January 30, 2016 65. ## science( chem) When a 0.1M solution of weak acid HA was titrated with a 0.1M NaOH. The pH measured when Volbase=1/2Voleq point was 4.62. Using the activity coeficents, calculate pKa. fA-=0.854 and fHA=1.00 For this I'm confused once again. I know that using the activity asked by christina on July 22, 2007 66. ## linear algebra show that if u dot v = u dot w for all u, then v = w. You can use the result of the previous problem: http://www.jiskha.com/display.cgi?id=1184622247 Linearity of the inner product implies u dot v = u dot w -----> u dot(v-w) = 0 This is true for all u, asked by chris on July 17, 2007 67. ## science How do work out what the empirical formula for aluminium selenide is? You need to provide the data. It's easier to explain with numbers than try to go through it with words. You do you not have numbers? Perhaps the question is, "How do we know what the asked by sarah on February 6, 2007 68. ## Website.need it please! Can any one help me to find which website is good for high school student to learn more subjects online with others without paying or any good website for doing home work or school game?. thank you. asked by Ochaya on August 10, 2009 69. ## Math The number of fish in a tank decreases by x% each year. Given that the number of fish halves in 8 years, work out the value of x. Give your answer to 1dp. (3marks) I've tried this question but am not sure of my answer. Could someone please go through it asked by Winter on June 5, 2017 70. ## Science A neutralization reaction between an acid and a base produced the salt Na2CO3. What acid and what base participated in this reaction? ---------------- Sorry about just asking without showing work or anything, but I don't really get the concept of this and asked by Anonymous on March 2, 2015 71. ## AP Physics 1: Pendulums A 2.20 kg pendulum starts from a height of 5.00m. It swings back and forth through one whole oscillation but only returns to a maximum height of 4.75m. How much negative work was done on the pendulum during the first entire oscillation? asked by Tyger2020 on August 25, 2017 72. ## physics Spider silk is a remarkable elastic material. A particular strand has spring constant 70 mM/m, and it stretches 9.5 cm when a fly hits it. How much work did the fly's impact do on the silk strand? asked by Eliana on March 9, 2012 73. ## French Can someone check my work? I'm trying to say: "He was at the zoo and a lion jumped out of the cage and attacked him." This is my attempt. Could you please fix any mistakes? "Il était au zoo et un lion a sauté de la cage et l'attaqué." asked by Natalie on June 6, 2008 74. ## Science What could happen if a plant’s phloem does not work correctly? Select one: a. Photosynthesis will not take place. b. The plant might be short of water. c. The plant might be short of food. d. The plant will not be able to dissolve minerals. asked by T.J And the Vibe on February 15, 2013 75. ## Physics A bike pump has a 2.3 cm diameter piston that can move a maximum length of 35 cm. How much work is done on the air in the pump if the initial pressure is 1 atm and the final pressure is 4.4 atm? asked by Aly on February 23, 2016 76. ## Physics A man lifts a 21.1 kg bucket from a well and does 3.1 kJ of work. How deep is the well? Assume that the man lifts the bucket at constant speed. Answer in units of m. I am not sure if I did this right: (mg)(d)= Wnet (21.1 kg)(9.81)(d)= 3100J d= 14.98 meters asked by Julia on March 2, 2008 77. ## programming ( qbasic) rem prints fibonacci series cls a=2 b=1 for p = 1 to 5 print a print b a=a + b b=b + a next p end I have done this program. How do you do it using modular programming.. FUNCTION...END FUNCTION???? I tried but it didn't work asked by mark on November 5, 2015 78. ## Dynamics A particle moving along a straight line is subjected to a deceleration a=-2v^3 m/s2. If it has a velocity v=8 m/s and a position x=10 m when t=0, determine its velocity and position when t=4s. I tried to integrate the deceleration equation, but it didn't asked by Dynamics Problems on July 11, 2014 79. ## Honors Chemistry Can someone check my work please? Thanks :)) 2. Write the formulas for the compounds formed between the following: g. Cu+2 and NO3- (the +2 and - are superscripts, while the 3 is a subscript) ===> I got Cu(NO3)2. h. NH4 and SO4(2-) (the two 4's are asked by Emily on October 13, 2009 80. ## Science A reversible heat engine operates with an efficiency of 50%. If during each cycle it rejects 150 cal to a reservoir of heat at 30°C, then what is the temperature of the other reservoir and how much work does it carry out per cycle? asked by KK on January 5, 2019 81. ## Pre-calculus Hello, Consider a geometric sequence with t3= 18 and t7= 1458. Are there one or two values for the common ratio? How does this affect the sequence (I got one, but the way this question mentions 2 ratios, I get the feeling there are 2 values.) My work: 1458 asked by Lucina on February 12, 2015 82. ## physics What is the time constant of a 10 H inductor and a 200 ohm resistor connected in series? Is my work correct? I did: T= L/R = 10 H divided by 200 ohm = 0.05 seconds = 50 milliseconds mS. Is that correct? asked by Brett on December 6, 2016 83. ## Algebra How do you work this out? Going downstream a tugboat averages 17 kph. Coming back upstream its average speed is only 6 kph. How fast does the current flow? How fast is the tugboat going? asked by Jillian on May 26, 2009 84. ## physics A 180 kg block is pulled at a constant speed of 8.3 m/s across a horizontal floor by an applied force of 135 N directed 15° above the horizontal. What is the rate at which the force does work on the block? asked by ghias on October 28, 2010 85. ## physics A car of mass 550 kg is moving at a speed of 1.5 m/s. A man pushes the car, increasing the speed to 3.2 m/s. How much work did the man do? A. 3435 J B. 2816 J C. 2197 J D. 4123 J asked by meriyhome on October 4, 2014 86. ## physics A 16.3 kg block is dragged over a rough, horizontal surface by a constant force of 157 N acting at an angle of 35 degree above the horizontal. Find the work done by the 157 N force. asked by Anonymous on February 24, 2012 87. ## Science A body of mass 10kg is moving with velocity 10m/sec.The work done to stop the body is : A) 500J B)-500J C)1000J D)-1000J How to calculate the answer? asked by Ujwal on June 16, 2017 88. ## Math A rectangles length and width are in a ratio of 17:2. The area is 136 square yards. What are the length and width. Have no idea how to even start to work this problem other than 17L X 2w= 136 asked by Mak on December 14, 2016 89. ## math You and your sister work on the weekends at your parents’ store. You receive$4 per hour and your sister gets $5 per hour. On Saturday both of you worked a total of 7 h and together made$32. How much money did each of you earn on Saturday?

asked by Anthony on January 27, 2016
90. ## physics

An amount of work equal to 3.5 J is required to compress the spring in a marble gun. If all energy is conserved, how much kinetic energy does a 25 gram marble have when it leaves the spring?

asked by Mimi on November 14, 2010
91. ## Calculus

Find an equation of the tangent line to the graph of f at the given point. f(x) = x + (4/x), (4,5) I tried using the limit process a lot, but it didn't quite work. If possible, please use the limit process. Thanks a lot to whoever answers this question.

asked by Tyler on September 27, 2016
92. ## physics

A truck accelerating at 0.0083 meters/second2 covers a distance of 5.8 × 104 meters. If the truck's mass is 7,000 kilograms, what is the work done to reach this distance?

asked by saluma on February 4, 2015
93. ## Physics

A person lifts a 5.2 kg cement block a vertical distance 1.2 m and then carries the block horizontally a distance 7.3 m. Determine the work done by the person and by the force of gravity in this process.

asked by Mike on January 9, 2012
94. ## physics

Given that the electric potential is 7.0×10^−2 V higher outside the cell than inside the cell, and that the cell membrane is 0.10 thick, calculate the work that must be done (in joules) to move one sodium ion from inside the cell to outside.

asked by nikki on September 5, 2011
95. ## physics

a helicopter of mass m has an acceleration of magnitude 0.12 upward. a)determine the force required to cause this aaceleration? b) how much work is done by this force in moving the helicopter a distance deltay upward?

asked by samima sabah on October 31, 2010
96. ## physics

Children in a tree house lift a small dog in a basket 4.90m up to their house. If it takes 201J of work to do this, what is the combined mass of the dog and basket?

asked by Anonymous on October 12, 2012
97. ## physics

216J if energy is required to raise the temperature of aluminium from 15 degrees Celsius to 35 degrees Celsius. Calculate the mass of the aluminium. My work I keep getting 0.012 but it is not right I know the formula is Q= m x C x T

asked by Jiskha help on November 14, 2014
98. ## Physical science

What is the formula of magnesium sulfate and ammonia? My work:MgSO4 + 2NH4OH --> (NH4)2SO4 + Mg(OH)2 Correct/Balance the equation below. MgSO4 + NH4OH → (NH4)2SO4 + Mg(OH)2

asked by DFD on December 15, 2014
99. ## computer

When you work with headers and footers in Word, the Header and Footer Tools tab or toolbar displays only when you are actually working within the header or footer. True False True?

asked by Bri on June 4, 2018
100. ## Art World Culture

10.)Most artists fall into a particular style because: A. They choose the style when they become a professional. B. They are given the style as an assignment in college. C. Their work naturally has the characteristics of the style. D. They chose to join a

asked by #FreeGucci on March 17, 2016