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 430
1. Biochemistry

you have a 0.200L of solution containing 250mM phosphate buffer, pH 6.8. An equivalent amount of HCl/NaOH with respect to the total amount of phosphate in the buffer --> mmol of NaH2PO3 + mmol of NaH2PO4 = 50 mmoles. What would the pH of the above buffer

asked by Abba on May 18, 2015
2. Analytical chemistry

Below i wrote a few problems, i did them all but in the book i don't have results, so i don't know if i did them right or not. I would really appreciate if someone would go through the problems and tell me if i got the right results. If i made a mistake

asked by Gloria on August 3, 2013
3. Accounting

Applying the interest allowance method, compute Julie's and Jennifer's share of net income if Julie invested \$40,000.and Jennifer invested \$24,000. At an 8% interest rate, with the remainder to be decided equally. Net income was \$10,000.

asked by Kathy on February 6, 2015
4. Chemistry

I have this question which I believe I solved correctly, but I was wondering if someone could look it over to make sure? The question is... Assay for Vitamin A (a fat soluble vitamin) required an extraction step into ether. In this assay, 2.00 mL of serum

asked by Rob on January 11, 2013
5. physics

1. How far (in meters) must a 600 kg pile driver fall, if it is to do 14000 J of work? 2. A spring whose spring constant is 150 N/m is compressed 0.800 m. What speed (in meters/second) can it give to a 0.600 kg ball when released? 3. A 550 N crate rests on

asked by Ricky on July 7, 2010
6. physics

1. How far (in meters) must a 600 kg pile driver fall, if it is to do 14000 J of work? 2. A spring whose spring constant is 150 N/m is compressed 0.800 m. What speed (in meters/second) can it give to a 0.600 kg ball when released? 3. A 550 N crate rests on

asked by Ricky on July 7, 2010
7. Physics

When a solar flare erupts on the surface of the sun, how many minutes after it occurs does its light show up in an astronomer's telescope on earth? I am totally confused..help!

asked by J on March 31, 2008
8. math

show me how do find volume i know it is base x height but then what? example 20 cm wide 17cm high and how do i bring it to nearest cubic unit. I am in 6th grade. thank you

asked by polly on January 22, 2009
9. math

Draw a picture of base-ten blocks and use the area interpretation for multiplication to show 34 X 28 complete the calculation by using a paper-and-pencil algorithm

asked by heatherly on June 15, 2009
10. chemistry

Express the following quantities in scientific notation: 700m __________ 0.00054kg _______ 4500000m _________ How many seconds are in 6.5 hours?(show T-chart)

asked by Kyle Jackson on September 5, 2012
11. Parametric derivatie help plz

Find the equation of the line tangent to the parametric curve define by x=cos2t and y=sin3t and t=pi/12 plz i don't no where to start from show working

asked by Collins on October 28, 2015
12. maths

The line segment connecting A(-18,8) and B(-10,-8) is divided in the ratio 1:3 by point C. The coordinates of C are... Please show your working and thx for taking your time to answer this question.

asked by Sam on December 23, 2016
13. Calculus

Prove that the function defined by: f(x)={1 if x is rational, 0 if x is irrational is not integrable on [0,1]. Show that no matter how small the norm of the partition, ||P||, the Riemann sum can be made to have value either 0 or 1.

asked by Jacob on April 6, 2017
14. english

• Use at least five adverbs and five adjectives to write a 150- to 300-word review of a movie, sporting event, musical performance, or television show

asked by heather on January 23, 2011
15. Algebra

If the trend for the growth in the median home value continues=d, what would be its value in the year 2007? show how you obtained your answer using the linear equation you found in part c).

asked by Jewel on June 7, 2012
16. math

The lappens but three large sandwich wraps. nine people in all will be at the picnic show three differnt ways to cut the sandwiches so that each person gets an equal share

asked by Anonymous on September 25, 2012
17. Math

A store owner bought comforters for x dollars and is marking them up 60 percent write two expressions that represent the selling price and show that they are equivalent.

asked by Jim on January 12, 2016
18. Vectors - Maths

Given that a = i - j + 2k, b = i + 2j + mk and c = 3i + nj + k, are linearly dependent. Express m in terms of n in simplest fraction form. Answer: m = (2n-9)/(n+3) Can someone pls show their working and explanation? Thx a lot ~C~

asked by C on January 5, 2017
19. chemistry

Consider the equation A(aq) + 2B(aq) 3C(aq) + 2D(aq). In one experiment, 45.0 mL of 0.050 M A is mixed with 25.0 mL 0.100 M B. At equilibrium the concentration of C is 0.0410 M. Calculate K. a) 7.3 b) 0.34 c) 0.040 d) 0.14 e) none of these the answer for

asked by raf on April 4, 2011
20. chemistry

(a) Construct a Lewis structure for O2 in which each atom achieves an octet of electrons. (Assign lone pairs where appropriate.) i am using marvin sketch and don't know what i need to show

asked by Samantha on December 2, 2012
21. english

Hi, I have to compare the story Young Goodman Brown to some modern day song or movie or television show (some form of entertainment). Do you have any ideas I could use?

asked by jon on February 22, 2012
22. chemistry

identify and show the bond in the formation of the following; AsH3 BaO BCL3 SO2 ZnC2 CL2 K2S PH3 PLS I NEED AN ANSWER THANKS

asked by joyce on June 19, 2011
23. Finance

shawn bought a home for \$100,000. he put 20% down and obtained a mortguage for 30 years at 5 1/2%. what is the total cost of the loan? can you show me how this is worked out?

asked by linda on August 26, 2011
24. Com155

Use at least five adverbs and five adjectives to write a 150- to 300-word review of a movie, sporting event, musical performance, or television show

asked by Jacqui on September 28, 2010
25. chemistry

Write a balanced chemical reaction to show the dissociation of solid magnesium chloride (MgCl2) in water, indicate states of the reactants and products

asked by Jessica on October 15, 2010
26. Chemistry

Draw the best Lewis structure for NCCH2C(O)CH2CHO, a neutral molecule. Show all atoms, bonds, lone pairs, and formal charges.

asked by Cathy on September 11, 2009
27. chemistry

1.15g of acetylsalicylic ia recovered from an aspirim synthesis reaction that began with 2g of salicylic acid, what would be the percentage yield for the preparation? show your computations

asked by Rogylyn on September 1, 2014
28. Science

3g of ethane c2h6 on complete combustion gaye 8.8g of co2 and5.4g of water show that the result are in accordance with the law of conservation of mass

asked by Shipra on July 14, 2019
29. chemistry

1) Aluminum Chloride- Red- PH: 4.0 2) Sodium Carbonate - Violet- PH: 9.5 Ammonium Acetate - Yellow - PH: 6.5 the question is: explanation with equation to show hydrolysis Could you please help me thank you.

asked by fenerbahce on July 12, 2012
30. English

“Give me a place to stand, Archimedes said, “and I can move the world.” These words show which figurative language? A. paradox B. satire C. simile D. metaphor D?

asked by quick help needed on May 19, 2016
31. mathematics

Two equal circle touch externally at point P. PX and PY are chords in the respective circles which are perpendicular. If the centres Are A and B. Show that AX is parallel to BY and AXYB is a parallelogram.

asked by Anonymous on May 4, 2014
32. physics

Two sounds, one of 200 Hz and one of 194 Hz occur at the same time. What beat frequency do you hear? Show your calculations I'm not looking for someone to do my homework for me. I just don't know what formula to use to figure it out.

asked by Bethany on January 25, 2012
33. Maths

This is a 3-D Geometry Problem.Please help me out!P is a variable point such that its distance from the xy-plane is always equal to one-fourth of the square of its distances from the y-axis.Show that the locus of P is a cylinder.

asked by Bobo on September 28, 2015
34. English

I'm writing the sentence "This TV show shows examples of behavior that can harm--" and then I list a bunch of things. Should it be a solid dash or two dashes like I wrote? Thank you.

asked by Ekaterina on June 11, 2009
35. science

Grapic organizer.show details that support this main ideals.thermal energy moves through solids liquid, gases and space

asked by anonymous on December 3, 2012
36. kuai

could you show me how to set ,y problems up so I have a chance at figuring them out. I have spent countless hours on the two statistic questions I posted and am still at square one. Please, you seem to know what you are doing and I'm willing to learn.

asked by Amy on November 4, 2013
37. Math

A test has 125 items. Each correct answer earns 1point and 65% is a passing grade. If you get 42 answers wrong will you pass? Show working

asked by Devon on February 12, 2012
38. math

You spin a spinner divied into thirds and labled a, b, c, and you flip a coin. use a tree diagram to answer the question. How many outcomes show heads and b?

asked by shion on February 25, 2012
39. calculus

prove the following integrals: a)sin3xcos7xdx = -1/20cos(10x)+1/8cos(4x) i know i have asked this question before but i am very confused bobpursley, can you please show me the steps of proves. thanks in advanced

asked by maria on January 28, 2010
40. computer graphic

This control on the Layers Palette in Photoshop changes the selected layer, allowing to show through from underneath. a See-through b transparency c saturation d color mode i am little confused between a and b...

asked by Anonymous on January 24, 2009
41. US History

53. Show how the role of the federal government was viewed by different groups at different times in the 20th century. I don't quite understand what this is saying, and I need to write an essay on this, so can someone explain it to me? Thanks -MC

asked by mysterychicken on November 13, 2010
42. physics

a boy weighing 350N runs up a flight of stairs consisting of 20 steps each 10cm high in 10 seconds. What is his power? show your workings

asked by marv on March 29, 2012
43. math

sunita baked a round cake for 11of her friends.she wants to divide it into 11 pieces with only 4 cuts. it is not important that the sizes of each piece should be the same how can she do that ? show it in diagram

asked by NAHID NOORI on June 13, 2012
44. Maths

The first year after 1999 which is the product of three consecutive integers is: 2004 2040 2046 2052 2184 Please show working out and choose either one of these years

asked by Babiinoob on April 26, 2011
45. calculus

Find the complex zeros of the polynomial function. Write f in factored form. f(x)=3x^4-10x^3-12x^2+122x-39 Please show wrok, I do not understand how to do this.

46. physics

A car traveling along a level road uniformly increases its speed from rest to 28m/s in 8.0s. Show that it travels a distance of 112m in this time.

asked by Daisha on February 12, 2011
47. physics HELP

A block a mass of .113 kg is slid horizontally with a acceleration of 2.612 m/s^2 What is the kinectic force and the coefficient of friction. Please show the steps in getting these answers,

asked by anthony on November 5, 2012
48. algebra

write in simplest form 1/10 / 1/4 they way you typed the problem illustrates well why it is so important to use brackets to show the precise order of operation. I will assume you meant (1/10) ÷ (1/4), if so then it would be (1/10)(4/1) =2/5

asked by Tony on April 25, 2007
49. Chem

1.15g of acetylsalicylic ia recovered from an aspirim synthesis reaction that began with 2g of salicylic acid, what would be the percentage yield for the preparation? show your computations

asked by Mouzier on May 11, 2019
50. Chemistry

Methane reacts with water to form CO and H2 as follows: CH4(g)+H2O(g)=CO9g)+3H2(g) The value of Kp at 298 k for the reaction is 7.7 *10^24, calculate Kc. If you can please show the steps I would greatly appreciate it. Thank you

asked by craig on December 10, 2013
51. English

I have a question its which diagram correctly represents this sentence? Sara, José, and Kenny were studying together for the test. How can I post a link to show you the diagrams?

asked by Emily on October 13, 2014
52. Physics

A 500.0 g metal block absorbs 3.25 × 103 J of heat to raise its temperature by 50.0 K. What is the substance? Please show steps because I have several problems like this and then I can see where I am goibg wrong

asked by Pat on March 12, 2012
53. math

The line x plus 7y=5 cuts the circle x^2 plus y^2=15 at the points P & Q. Find: a) P & Q. b) the midpoint of PQ. (I don't know why, but the plus sign does not show after I submit d question so dats y I wrote it in words)

asked by Francis on March 2, 2015
54. english

Could you show me some examples of sentences using pronouns desribing a recent interaction with a friend or family member about personal finance or credit cards.

asked by Jackie on April 14, 2011
55. Calc

Evaluate the limit if it exists, otherwise, write ∞,-∞ or DNE as appropriate. (you may not use the L'Hospital Rule) lim e^cosx \squareroot(tan((3)/(4)x)+10) x-> π Please show steps I am very confused!

asked by Clay on September 9, 2018
56. anatomy

a person with a tumor of the anterior that oversecretes ACTH into the blood stream would be expected to show signs of cushings disease. is this true or false

asked by Leslie on November 20, 2016
57. Gr. 10 math again!

Factor by Grouping.Thanks Bob. PLEASE SHOW ME THE STEPS! 1.) 6x2-21xy+8xz-28yz just to make it clear,the 2 infront of -21 is actualli an Exponent 2. 2.) x2+5x+7x+35

asked by Nini on April 6, 2009
58. physics

describe an expirement to determine the specific heat capacity of the metal . state the precaution that should be taken and show how the results in calculated from the measurement made?

asked by poppy👌🤔 on May 6, 2019
59. identify tenses

1. The dou had been given the second best time slot. a. past perfect in the passive voice b. past continuous in the passive voice c. an infinitive in the passive voice Answer a 2. The promotional poster was designed by Zach a. past continuous in the

asked by Jim Collum on June 12, 2013
60. physics

I once was given a metal whiskey flask for being in my cousin’s wedding. When it got dented, I put in 1 gram of H2O (initially 21°C, just like the air filling the rest of the flask) and heated it up to boil the water. It popped the dent out. Assume the

asked by sumsum on March 20, 2014
61. physics

I once was given a metal whiskey flask for being in my cousin’s wedding. When it got dented, I put in 1 gram of H2O (initially 21°C, just like the air filling the rest of the flask) and heated it up to boil the water. It popped the dent out. Assume the

asked by mike on April 2, 2014
62. Physics

I once was given a metal whiskey flask for being in my cousin’s wedding. When it got dented, I put in 1 gram of H2O (initially 21°C, just like the air filling the rest of the flask) and heated it up to boil the water. It popped the dent out. Assume the

asked by SumSum on March 19, 2014
63. Math

I need help in seeing if I solved these inequality problems correctly. 1. A store sells two models of computers. Because of the demand, the store stocks at least twice as many units of model A as of model B. The costs to the store for the two models are

asked by Jamie on May 19, 2008
64. Discreet Mathematical Structures

Use proof by contraposition to prove the following statement: If A is the average of two positive real numbers then one of the two numbers is greater than or equal to A. Proof. Domain: positive real numbers P: A=(x+y)/2 Q: x is greater than or equal to A

asked by Anna on October 7, 2010
65. History

Which of the following was not one of the underlying causes of the Panic of 1893? the failure to build enough railroad lines to satisfy market demands the weaknesses of the American banking system the withdrawal of British funds from American investments

asked by jackie on September 21, 2015
66. Physics

Two blocks, each of mass,m, are attached to the ends of a massless rod which pivots as shown in Fig. 8-40. Initially the rod is held in the horizontal position and then released. Calculate the magnitude and direction of the net torque on this system. This

asked by Emily Grossman on March 24, 2011
67. American National Gov.

The American bureaucracy conjures up the following images except cumbersome “red tape.” civil servants who are inefficient, unresponsive, and unhelpful. officials who have amassed power and who act against the rights of citizens. a system that can act

asked by Heather on January 26, 2014
68. bus 599

A group of economics students gathered to study for a test on the money and banking system in the U.S. During a fast and furious brainstorm session, Jill scribbled down several key phrases she will use to study tomorrow. Unfortunately, in her haste, all

asked by Anonymous on March 5, 2012
69. Physics

If five forces act towards the same point on a body at angles of 60, 120, 180, 240 and 270 degrees and their respective magnitudes are 60N, 40N, 30N, 25N and 20N. Determine whether this system of forces is in equilibrium; find the resultant.

asked by Chinedu on March 3, 2010
70. English

Rewrite this paragraph so that it is set in the future. --------------------------------------- The applications for this technology are far-reaching. The special system allows companies to track shipments. It also helps keep people safe in countries with

asked by Larry on November 17, 2008
71. science

The current classification system used by biologists is: A)Complex and unchanging. b)universally accepted by all biologists c)based on four generalized types of living organism: the bacteria, archaea, eukarya and protista d) updated and revised whenever

asked by Jon on September 17, 2011
72. Physics

Sorry for the repost, i made a typo in the original post's subject. A dry water well is 1.5 m in radius and 5.0 m deep. In order from lowest to highest, the fifth resonant frequency of this well is closest to ... I know that it is an open-closed system,

asked by Sammy on January 27, 2010

Terry realizes that the draft of her memo announcing a new suggestion system mentions who will be evaluating the suggestions on both the first and second page, so she deletes the second reference and adds a little more to the first. What part of the

asked by terrie on November 24, 2010
74. Social studies

3.how were farms of the new england colonies similar to the farms of the up country A.separating church and state B.requiring all laws be approved by the council*** C. Creating a jury system for legal decisions D. Giving the people a stronger voice in the

asked by Taylor on October 7, 2014
75. physics

1. If m1= 3kg and m2= 2kg then find acceleration and tension action on the system. 2. A batsman deflects a ball by an angle 45 degree without changing its initial speed which is equal to 54km/hr.What is the impulse imparted to the bal.(mass of the ball is

asked by Mona on August 14, 2012
76. education

I am trying to find examples of the similar as well as the differing roles that home, society, and school play in today’s educational system. Determine how—as an educational professional—you will enhance these relationships for the benefit of your

asked by Sally on September 12, 2008
77. Social Studies

5. Which of the following was an effect of nativism in the United States in the 1920s? the Great Migration the Scopes Trial** the Jones Act of 1917 the quota system My answer choice is number two. I'm looking for confirmation of my answer and if I'm wrong,

asked by SS help on March 29, 2018
78. anatomy

When comparing Tay-Sachs disease and Duchenne's muscular dystrophy which of the following do both have in common? A.they both involve malfunction of the nervous system B.they both involve mutations in which fat replaces normal tissue C.they both are

asked by unknown on September 30, 2008
79. Chemistry

The water from a hydrated magnesium salt is driven off by heat in a closed system. If the steam generated exerts a pressure of 24.8 atm in a 2.00L container at 120 degrees C, determine the number of moles of H2O driven from the compound.

asked by Missy on October 6, 2010
80. law

can somebody who has done LLB advice me on studyn for da first year exam in may..i fear cz i was not really in touch n i doubt whethr i can score well for all 4 subjects(criminal/contract/constitution/english legal system) pls advice me how to pass all

asked by ruwangi on February 12, 2012
81. physics

A light, rigid rod l = 5.55 m in length rotates in the xy plane about a pivot through the rod’s center. Two particles of masses m1 = 9.8 kg and m2 = 2.4 kg are connected to its ends. Determine the angular momentum of the system about the origin at the

asked by d on February 12, 2015

Terry realizes that the draft of her memo announcing a new suggestion system mentions who will be evaluating the suggestions on both the first and second pages, so she deletes the second reference and adds a little more to the first. What part of the

asked by Anonymous on May 30, 2010
83. Science

Adam suffers from severe emphysema. Gas exchange in his lungs is not adequate, and he requires supplemental oxygen. But even though his blood carbon dioxide levels are elevated, his blood pH is close to normal. Considering the urinary system, explain how

asked by Colleen on July 30, 2014
84. chemistry

A drop of oil (volume 0.05cm3) is released from a medicine dropper on to the calm surface of a pond where it spreads out to cover an area of "40m2". Assume that the oil film has a uniform thickness equal to the diameter of a oil molecule. Calculate the

asked by angel on March 9, 2007

A 0.60 kg sphere rotates around a vertical shaft supported by two strings, as shown. If the tension in the upper string is 18 N. Calculate the tension in the lower string? the rotation rate (in rev/min) of the system?

asked by Joeline on May 19, 2013
86. Health

Which of the following lipoproteins carries dietary fat that is absorbed into the digestive system to the liver and body cells for use? a. Chylomicrons b. High density lipoprotein c. Micelle d. Low density lipoproteins I think its A is that correct?

asked by Anonymous on October 2, 2013
87. Computer

An organization is having its seven department located on 3 floors of a building,3 on groubd, 2 on first & 2 on the second floor each department is having 4 to 5 members & each member has to be provided with a computer system. In order to network these

asked by Sonal on June 3, 2013
88. Health and physical education

The peripheral nervous system (Select all that apply)A. Is made up of the brain and spinal B. cord Links the body to the brain C. Is made up of sensory and motor neurons D. Is responsible for thought and reasoning.......A and C?

asked by Haruhi on March 23, 2016
89. P.E.

The peripheral nervous system (Select all that apply) Is made up of the brain and spinal cord Links the body to the brain Is made up of sensory and motor neurons*** Is responsible for thought and reasoning***

asked by Anonymous on May 1, 2015
90. Chemistry

Bulb A is 100mL and contains Helium at 1atm. Bulb B is 500ml and contains Argon at 2atm The bulbs are connected together by a valve. (assume constant tempreature). What is the mole fraction of Argon in the opened system?

asked by Kayla on July 2, 2013
91. Physics

A weight lifter manages to lift a 147 kg weight a distance of 1.1 m. Treat her as a thermodynamic system and find how much heat (in kcal) she must put out if her internal energy decreases by 3620 J during the lift.

asked by Riley on January 31, 2014
92. physics

A laundry detergent contains a three-level quantum system ("whitener") which absorbs ultraviolet light at 273 nm. It emits light at 597 nm as part of a two-step process . What is the wavelength of the second emission process?

asked by Lorlyna on April 26, 2011
93. Science

Which term do scientists use to describe objects made of ice and rock in the solar system that enters the earth's atmosphere. 1: asteroids 2: comets 3: meteors 4: planet I choose comets or meteors

asked by Lovely on March 11, 2019
94. Physics

A 66000 kg iceberg at −6.7◦C breaks away from the polar ice shelf and floats away into the ocean at 6.36◦C. What is the final change in the entropy of the system, when the iceberg has completely melted? The specific heat of ice is 2010 J/kg ·◦C.

asked by asdf on November 19, 2017
95. Physics

A block and tacle of 6 pulley is used to raise a load of 300n steadily through a height of 30m if the workdone against friction is 2000j. calculate the workdone by the effort,the applied effort,the efficiency of the system

asked by HAKEEM on January 24, 2016
96. Differential Equations

A car is traveling at 70 mph skids 240 ft after it's breaks are suddenly applied. Assuming that the cars breaking system provides a constant deceleration, find that deceleration. How long did it take the car to stop?

asked by Jenna on June 19, 2011
97. social studies

How did horace mann feel that reforming the american educational system was important? A. it would help people attain better jobs B. it would help in the fight to end slavery C. it would help in the fight for gender equality D. it would help people become

98. THE AGE OF JEFFERSON TO THE AMERICAN EXPANSION

Which of the following was true of the Judiciary Act of 1801? A. It expanded the federal court system. B. It was opposed by the Federalists. C. It packed the Supreme Court with Democratic Republicans. D. It reduced the power of the federal courts.

asked by Anonymous on February 24, 2011
99. Chemistry

Samples of NH3 and 02 are placed in a rigid container. When the equilibrium below is established, the partial pressure of H2O is 0.784 atm. What is the partial erasure of NO when the system is at equilibrium? 4NH3 + 5O2 -----> 4NO + 6H2O

asked by Anonymous on April 27, 2015
100. physics

An astronaut exploring a distant solar system lands on an unnamed planet with a radius of 2520 km. When the astronaut jumps upward with an initial speed of 2.94 m/s, she rises to a height of 0.83 m. What is the mass of the planet?

asked by janie on May 31, 2010