# 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

92,096 questions, page 606
1. ## physics

Consider an ideal spring that has an unstretched length l0 = 3.9 m. Assume the spring has a constant k = 20 N/m. Suppose the spring is attached to a mass m = 6 kg that lies on a horizontal frictionless surface. The spring-mass system is compressed a

asked by PLS HELP on October 11, 2013
2. ## Probability Questions - STAT

1) The probability of getting a certain disease is 0.2. A certain test is available which returns a positive result 90% of the time for those with the disease, and a negative result 75% of the time for those without the disease. Compute Pr{Test positive}.

asked by Need Help Urgent on January 6, 2016
3. ## Chemistry

If 20.0 grams of Al is placed into a solution containing 115 grams of H2SO4, how many grams of hydrogen gas could be produced? 1. Write the balanced equation. 2Al + 3H2SO4 ==> Al2(SO4)3 + 3H2 2. Convert 20.0 g Al to mols. Remember mols = g/atomic mass 3.

asked by Britney on March 18, 2007
4. ## Physics A2 level Student

When I came new to As I was given these as homework after we did easy practise questions in class. I find this topic and all its worksheets easy except this one for some reason. I got every single one of these questions wrong and struggled and still do

asked by Help needed on September 19, 2018
5. ## Chemistry

94.0 g of a metal at 88.0°C are added to 55.0 g of water at 26.0°C. When the system reaches constant temperature, the temperature is 39.3°C. What is the specific heat of the metal? The specific heat of water is 4.184 J/g·°C.

asked by Megan on March 8, 2010
6. ## Physics

In a closed system where kinetic, potential, and thermal energy are changing, the kinetic energy decreases by 54 J, and the thermal energy increases by 13 J. What is the change in the potential energy?

7. ## physics

A particle that hangs from a spring oscillates with an angular frequency ω. The spring-particle system is suspended from the ceiling of an elevator car and hangs motionless (relative to the elevator car) as the car descends at a constant speed v. The car

asked by flame on October 8, 2010
8. ## physics

A particle that hangs from a spring oscillates with an angular frequency ω. The spring-particle system is suspended from the ceiling of an elevator car and hangs motionless (relative to the elevator car) as the car descends at a constant speed v. The car

asked by flame on October 6, 2010
9. ## Physics

A uniform, 274-N rod that is 2.05m long carries a 225-N weight at its right end and an unknown weight W toward the left end.When W is placed 50.3cm from the left end of the rod, the system just balances horizontally when the fulcrum is located 78.0cm from

asked by Robin on April 12, 2015
10. ## phys101

in a calorimeter can(water equivalent=40g)are 200g of water and 50g of ice,all at 0 degreea celcius.into these poured 30g of water at 90degrees celcuis.what will be the final temperature of the system?specific capacity of water is 4186j/kg per degrees

asked by KABELO on April 29, 2010
11. ## physics

A particle that hangs from a spring oscillates with an angular frequency ω. The spring-particle system is suspended from the ceiling of an elevator car and hangs motionless (relative to the elevator car) as the car descends at a constant speed v. The car

asked by flame on October 7, 2010
12. ## Chemistry

Which aqueous solution below is expected to have the lowest freezing point? Assume 100% dissociation for ionic species. 1)0.25m MgBr2 2)0.30m Na2SO4 3) 0.50m KCl 4) 1.0m sucrose 5) 0.40m Cr(NO3)3 I think that the answer is 0.30NaSO4 but I am not positive.

asked by Hannah on February 12, 2012
13. ## English

I urgently need you to help me rephrase the following lines (you once told me they were wrong.number 2). Macbeth: "Methought I heard a voice cry, “Sleep no more! Macbeth does murder sleep”—the innocent sleep,Sleep that knits up the raveled sleave of

asked by Henry2 on October 23, 2011
14. ## English

Could someone please help me make this feature article flow and be enticeing to the reader? With winter on the horizon, many Australians are again facing the prospect of drought. If there isn’t a better than average rain season this year many Australian

asked by Jake on May 5, 2007
15. ## accounting

The Bags and Luggage Company had the following account balances as of January 1: Direct Materials Inventory \$ 8,700 Work in Process Inventory 76,500 Finished Goods Inventory 53,000 Manufacturing Overhead - 0 - During the month of January, all of the

asked by alexis on January 22, 2013
16. ## biology

I'm doing a paper on a case study. The man, John Doe, is 55 years old, has high cholesterol, and has experienced frequent chest pains, profuse sweating, dizziness, and shallow breathing. These are the questions I have to answer: 1) What physiological

asked by Anonymous on January 25, 2011
17. ## Physics

Suppose now that the air carts below are both moving to the right initially. The cart to the left has a mass m1 and an initial speed v0; the cart to the right has an initial speed v0/2. If the center of mass of this system moves to the right with a speed

asked by Kelly on April 27, 2010
18. ## English(Clauses and Sentences)

I need help with this... One Sunday, when half of us- including my father - were at work, the rest-including myself - were in the block, taking advantage of the chance to stay in bed late in the morning. These are my guesses... 23. Isolate the dependent

asked by Sonic on September 23, 2007
19. ## english

please send me some example about that essay, "Away to decrease your chance of becoming a victime of random violence" There are no "examples" of essays here. You must write your own; then post it and someone here will be able to give you feedback. Here are

asked by louise on November 30, 2006
20. ## History

Was not sure whether you got the last post. I am repeating it. Is this a thesis statement. Please comment and can you advise me whether the grammar,spelling etc. Is good? In this essay I am going to show you the impact of the Industrial revolution. By the

asked by Ruth on March 3, 2010
21. ## Art

The jeweler set a ring so that the green of the emerald contrasted with the white of the diamonds. He decided that adding the large, costly stone was worth it a. because of the archival quality of the stone b. for aesthetic reasons•• c. to show his

asked by Vanessa on February 1, 2016
22. ## Maths simple interest

Q1)The length of time for \$5000 to earn \$1000 if invested at 10% per annum AND Q2)Khalid invests \$6750 at 8.5% per annum.How much interest has he earned and what is the total amount in his account after 4 years? Umm thanks in advance and also pls show all

asked by Rajluxmi on May 16, 2016
23. ## Math

This is the question. In 1991, an American, Ann Trason, set a world record by running 100 km in 7hr,50min,09sec. What is the best estimate of her average speed? A.12 km per hour B.14 km per hour C.16 km per hour D.18 km per hour how do u figure this out?

asked by Meherin on February 25, 2009
24. ## com155

can you show me if the words in bold are the pronouns in the following sentences and what kind of pronoun they are? My mom and I were discussing her credit card statement over the phone yesterday. She was upset at how high her bill was. She has a 12.5%

asked by kat on May 15, 2011
25. ## com220

Need some feedback or a review of a rough draft essay and full sentence outline. It may appear that I am not referencing sources, but believe me I have full reference page with 7 sources to site thus far in. I just need someone to take a look at the layout

asked by wendy on February 3, 2010
26. ## Word Problems-Math

Please help with my word problems? Solve the problem. The rabbit population in a forest area grows at the rate of 6% monthly. If there are 260 rabbits in April, find how many rabbits (rounded to the nearest whole number) should be expected by next April.

asked by Stacey on October 23, 2007
27. ## Algebra-Problems

Please help with my word problems? Solve the problem. The rabbit population in a forest area grows at the rate of 6% monthly. If there are 260 rabbits in April, find how many rabbits (rounded to the nearest whole number) should be expected by next April.

asked by Stacey on October 24, 2007
28. ## Physics

A 136kg crate is at rest on a floor.A man attempts to push it across the floor by applying 412N force horizontally. Taking the coefficient of static friction between the crate and the floor to be 0.37,show that the crate does not move.

asked by Anonymously on November 10, 2018
29. ## pyhsics

A 1kg projectile is fired at 10m/s from a 10kg launcher. The momenta of the projectile and the launcher have the same magnitude, but opposite directions. Show that the KE of the projectile is 10 times gerater that the KE of the recoiling launcher. KE =

asked by sherri on April 6, 2010
30. ## chem!!

Question: 1. The value of the equilibrium constant for the reaction H2CO3(aq) + energy ƒnƒnH2O(l) + CO2(g) can be changed by introducing a change to which component of the equation? This relates to the Le Chatelier principle. Thanks! Keq (the constant

asked by ??? on June 14, 2006
31. ## chemistry

calculate kole fraction of hcl in solution of hcl contaning 24.8% of hcl by mass

asked by dipak on August 28, 2015
32. ## Biology

What happened if you put the Elodea leaf cells in a solution of 0.5% NaCl,1.8% NaCl and 0.9%NaCl?

asked by Ivy on July 23, 2011
33. ## Chemistry

How many mL of 0.100 M HCl must be added to 100.0 mL of 0.100 M F- to prepare a buffer solution that has a pH of 3.05? F- (aq) +H20 (l) HF (aq) +OH- (aq) Kb= 1.47*10^-11

asked by TP on April 3, 2018
34. ## Math

A whole brick is balanced with 3/4 pound and 3/4 brick. What is the weight of the whole brick ? Use a visual solution process

asked by Dell on October 29, 2012
35. ## ap chemistry

The ionization constant of HF is 7.2 × 10−4. What is the molar concentration of H+ in a solution which is 0.353 molar in HF and 0.145 molar in KF?

asked by gabriella on February 4, 2014
36. ## Bio/Chem

If i change the concentration of the 3% hydrogen peroxide solution to 1.5%, am I changing its concentration or percent concentration?

asked by Pink on April 20, 2014
37. ## algebra

how many real number equations does this equation have? 0= -7x^2+6x+3 A. 1 solution* B. 2 solutions C. no solutions D. infintie solutions

asked by zzz on April 29, 2019
38. ## Math

What is an estimate of the solution of the equation 6n+3=2? Use a table ok so I know the answer is -1/6 but its asking to use a table? does anyone know what kind of table you use for this and how I'd use it? thank you soo much

asked by Kylie on October 21, 2016
39. ## chemistry

A 0.010 M solution of a weak monoprotic acid has a pH of 3.70. What is the acid-ionization constant, Ka, for this acid? a. 2.0 ´ 10-4 b. 2.0 ´ 10-5 c. 4.0 ´ 10-6 d. 4.0 ´ 10-7 e. 4.0 ´ 10-8

asked by zacky on May 13, 2010
40. ## Honors Chemistry

When a solution is red, does it absorb or transmit red light? If it absorbed red would you see it? You see what is transmitted.

asked by Anonymous on October 16, 2006
41. ## Math

What is an estimate of the solution of the equation 6n+3=2? Use a table. ok so I know the answer is -1/6 but its asking to use a table? does anyone know what kind of table you use for this and how I'd use it? thank you soo much

asked by Memes on October 2, 2017
42. ## Data Management

Could you help me with this math question. The mean of 4 numbers is 5 and the mean of 3 different numbers is 12. What is the mean of the 7 numbers combined? Produce an algebraic solution.

asked by Mabel on March 2, 2015
43. ## math

How much pure acid must be added to 2 liters of a 10% solution of acid to obtain a mixture that is 20% acid?

asked by ken on January 17, 2017
44. ## Chemistry

A 112 mL solution of 0.351 M HCl is added to 52.0 mL of 0.161 M HCl. What is the new concentration of HCl?

45. ## Physics Urgent

A container of volume V = 103 cm3 has a mass of 30.0042 g when evacuated. When the container is filed with an unknown gas of pressure p = 4.72 atm at temperature T = 20oC, the mass of the system increases to 30.9508 g. Assuming that the unknown gas behaves

asked by Sydney on November 8, 2010
46. ## Physics Urgent

A container of volume V = 103 cm3 has a mass of 30.0042 g when evacuated. When the container is filed with an unknown gas of pressure p = 4.72 atm at temperature T = 20oC, the mass of the system increases to 30.9508 g. Assuming that the unknown gas behaves

asked by Sydney on November 8, 2010
47. ## accounting

Schumacher Company uses the perpetual inventory system, and it engaged in the following transactions during 2012: 1) Started the business by issuing common stock for \$7,500 cash 2) Paid cash to purchase \$5,000 of inventory 3) Sold inventory that cost

asked by Anonymous on March 7, 2012
48. ## History

In what way was the Khmer empire influenced by India? A.The Khmer empire used an adapted form of India's writing system. B.The Khmer empire was conquered by India. C.The Khmer empire's common people practiced Buddhism. D.The rulers of the Khmer empire

asked by LARRAY on December 15, 2018
49. ## Math

Use the definition of the derivative to show that if f(x)= square root of x, then f(x)= 1/2(square-root x)

asked by Paul on February 15, 2013
50. ## Vectors Math

You will often see proj (Vector a onto Vector b) written as proj b⃗ a⃗ .Show that projb⃗ a⃗ =(a⃗ ⋅b⃗ b⃗ ⋅b⃗ )b⃗ .

asked by Arashvir on February 22, 2015
51. ## programming

Can someone teach me how to show whats on my computer screen to another computer's screen?

asked by Clayton on December 18, 2014
52. ## Differential Calculus

use the rule that says limit of (e^h - 1)/h = 1 as h approaches 0 to show that the limit of [ln(x+h) -lnx]/h as h approaches 0 = 1/x, where x>0

asked by Kristen on November 8, 2008
53. ## calculus1

who can show me step by step on how to differentiate f(x)= (-x^2-1)/(x^2-1)^2. please do so. The answer must be f'(x)=(2x^3+6x)/(x^2-1)^3 or it is a wrong answer

asked by john on December 16, 2017
54. ## calculus

use the rule that says limit of (e^h - 1)/h = 1 as h approaches 0 to show that the limit of [ln(x+h) -lnx]/h as h approaches 0 = 1/x, where x>0

asked by Anonymous on November 8, 2008
55. ## math

how do you simplify cos(A+B)*cos B=sin(A+B)*sin B can you show me the steps? thank you very much!!!

asked by candybar on February 9, 2011
56. ## calculus

Let g(x)=f(2x). Show that the average value of f on the interval [0,2b] is the same as the average value of g on the interval [0,b]. Please explain how this problem is done!!!

asked by Buddy the Elf on January 18, 2012
57. ## math

caculate the following fractions 1/3+ 2/3+ 5/3 what is the answer to these fractions and show houw you get the answer. please.

asked by Dana on October 25, 2012
58. ## Calculus

show that the tangent to the curve f:f(x)= x^2-x at the point p1(0,0) is perpendicular to the tangent to the curve at p2(1,0)

asked by Anonymous on February 3, 2013
59. ## Differential Calculus

use the rule that says limit of (e^h - 1)/h = 1 as h approaches 0 to show that the limit of [ln(x+h)-lnx]/h as h approaches 0 = 1/x, where x>0

asked by Kristen on November 7, 2008
60. ## Math

Show that the angle between the vector joining (a, b, c) and (b, c, a) and the vector joining (a, b, c) to (c, a, b) is equal to π/3

asked by Monica on October 12, 2010
61. ## math

show that any positive odd integer is of the form 6q+1, 6q+3 or 6q+5, where q is any positive integer.

asked by priya on June 21, 2009
62. ## math

how do you show that lim((e^(h)-1)/h)=1 as h approches 0 given the series e^x= 1+x+(x^2/2!)+(x^3/3!)... And given F(x)=e^x how do you find the lim((f(x+h)-f(x))/h)as h approches 0

asked by alex on February 24, 2009
63. ## English

1. Time is up. 2. Time is over. 3. Time is finished. 4. Time is off. =============== At the end of a talk show, what can an MC say?

asked by rfvv on September 6, 2015
64. ## algebra

Simplify x / 6x - x^2 Please show me how you did it so i can understand! Another one, Simplify x^2 - 3x - 18 / x + 3 This is a fraction Another one, k + 3 / 4k - 2 (this is a fraction) * 12k^2 + 2k - 4)

65. ## Math

Please show the steps of 2209^1/2 or steps of square root of 2209?

asked by Sonny on September 28, 2010
66. ## Calculus length of curve

Hi--can anybody show me how to do this? Find the length of the curve r(t)= (sqrt2)i + (sqrt2)j + (1-t^2)k from (0,0,1) to (sqrt2, sqrt2, 0). Thank you!!!!!!!

67. ## number theory

give an example to show that a^2 congruent to b^2 mod n need not imply that a congruent to b mod n.

asked by Laura on April 18, 2009
68. ## Algebra

Can you please show me step by step to the answer you have given me. -1/4(8x+2). I still do not understand how you came up with the answer. Thank yooi

asked by Theresa on January 27, 2013
69. ## math

Show that any positive odd integer is of the form 6q+1, 6q+3 or 6q+5, where q is any positive integer

asked by priya on June 20, 2009
70. ## algebra

i have no less than 6,000 to spend and no more than 10,000 write an inequality to show how much I have to spend

asked by charlyn on February 13, 2010
71. ## Probability

Show that if events A B and C are independent that the following pairs of events are also independent: a) A and B Union C b) A - B and C

asked by Chris on February 3, 2009
72. ## math

convert 689 base 10 to base 3. Can you please show me this step by step

asked by Emily on September 26, 2017
73. ## math- calculus

You will often see proj (Vector a onto Vector b) written as projb⃗ a⃗ .Show that projb⃗ a⃗ =(a⃗ ⋅b⃗/ b⃗ ⋅b⃗ )*b⃗ .

asked by anon on February 26, 2014

I need help with this problem ! 5 2/5 - 3 4/5= ? 6 1/10 - 3 4/10 = 10 - 4 2/5= ? PLEASE! SHOW ME EACH PROBLEM STEP BY STEP SO , I CAN FINISH MY HOMEWORK! THANK YOU!

asked by pat on March 3, 2011
75. ## Linear Algebra

a) Show that if A has a row of zeros and B is any matrix for which AB is defined, then AB also has a row of zeros.

asked by Sarah on April 7, 2010
76. ## Math

40-3n=-23 what is n? 2/3-6h=-13/6 what is h? write as a equation,then solve. the quotient of a number and 2, minus 9, is 14 a number decreased by 7 and then divided by 5 is 13 the sum of 15 and 7 times a number is 99

asked by Maryam :) on October 23, 2012
77. ## algebra

Solve the linear equation using any technique you have learned. Name the technique. Check. 3x + 12 = -7x - 28 I know the answer is x = -4 and I know that substitution is the technique that is used, but I can't figure out how to set this up

asked by lovey on February 21, 2010

The length of a rectangle is 5 ft more than the width. If the area of the rectangle is 36 sq. ft what are the dimensions of the rectangle? (Please provide steps/explanation to solve this problem.)

asked by purpletree on March 29, 2009
79. ## GYAN

a base ball team has lost games and has won 13 games. WHAT PER CENT OF THE GAMES PLAYED DID THEY WIN? HOW CAN SOLVE

asked by SUNIL on February 9, 2016
80. ## Math

How would I would I solve this problem -25-75h=h+25 Add 25 to both sides. Subtract h from both sides. This should leave you with -76h = 50 Finally, divide both sides by -76

asked by Dustin on March 15, 2007
81. ## Physics/Maths

Keplers third law I understand. T^2/a^3 of one planet = T^2/a^3 second planet. But I can't do the algebra to solve for the second planet's a^3 (semimajor axis) Would someone walk me through the steps please? Thanks.

asked by charlie on June 11, 2009
82. ## Math

1. Solve each absolute value equation or inequality and choose the correct answer from the choices provided. |x| + 5 = 18 (1 point) 5 or –5 13 or –13 18 or –18 23 or –23 2. |x + 3| < 5 (1 point) –8 < x < 2 –2 < x < 8 3 < x < 5 –3 < x < 5 3.

83. ## algebra 1

Given any random, 3-digit number, what is the probability that a number will be: a) a multiple of 5 b) divisible by 2 c) a square number i know the answer but i don't know how to solve it

asked by naomi on January 18, 2013
84. ## CHEMISTRY

WHEN A 50.0g SAMPLE OF AN ELEMENT COMBINES COMPLETELY WITH ANOTHER ELEMENT TO MAKE 78.4g OF A COMPOUND. WHAT MASS OF THE SECOND ELEMENT REACTED? HOW TO i SOLVE THIS PROBLEM?

asked by pat on September 27, 2007
85. ## math

One leg of a right triangle is one less than twice the other. The area of the triangle is 18 square feet. What is the length of the 3rd side of the triangle? Solve by factoring. A= 1/2 (b)(h) 18= 1/2 (x)(2x-1)

86. ## Physics

Here, I am dealing with a Science formula for momentum. The formula is: M= mv So, I have: m= 10 grams (.01 Kilograms) v= 5,000 centimeters a second (50 m/s) It says to Find M and also solve the formula for M. Please help!

asked by Amal on June 8, 2010
87. ## Math

I want to check this. I had used formulas V = B x H and I x w x h to solve these What is the volume of the box that is 14 inches long, 7 inches wide and 10 inches high? I got 980. Am I right?

asked by Ben on December 16, 2014
88. ## Statistics

hii. I have a question about pdf and cdf.. I couldn't solve it Please help me :/ 1) the pdf of the random var. X is given by f(x)= (3/8)(x+1)^2 if -1

asked by Melike on January 10, 2014
89. ## Math

How do you solve this? I have tryed so many times and can not get the right answer. (1.65-1.05)^2/0.4+0.8 The answer is suppose to be 1.7 but everytime I do the problem i don't get anything near that answer. Help would be greatly appreciated.

asked by Sally on January 21, 2010
90. ## Physics

Here, I am dealing with a Science formula for momentum. The formula is: M= mv So, I have: m= 10 grams (.01 Kilograms) v= 5,000 centimeters a second (50 m/s) It says to Find M and also solve the formula for M. Please help!

asked by Amal on June 8, 2010
91. ## Trigonometry

How do you solve this trig identity? Using @ as theta: Sin@-1/sin@+1 = -cos@/(sin@+1)^2 I've tried it multiple times but I can't seem to arrive at the answer.

asked by Sammy on November 27, 2012
92. ## US History

In the Watergate Scandal, I know that 5 men broke into the Democratic National Committee headquarters and Nixon did not want to give up the tapes that revealed that he wanted to cover up the break in... why? 1) Did Nixon put up the tape recording system in

asked by Amy~ on August 7, 2010
93. ## physics

A set of crash tests consists of running a test car moving at a speed of 11.6 m/s (25.52 m/h) into a solid wall. Strapped securely in an advanced seat belt system, a 61 kg (134.2 lbs) dummy is found to move a distance of 0.69 m from the moment the car

asked by Tsion on February 12, 2014
94. ## The court system

I need to write a 1400 word paper comparing the entertainment fiction of the court system with its reality. Describe the fictional portrayals of the courtroom including the trial process, the roles of the prosecution and defense, the roles of the courtroom

asked by Ron on November 29, 2008
95. ## English

Writeacher,I need you help to work out the questions to the following answers (You have already checked). 1) Which pattern does Robinson's education of Friday recall? What advantages does Robinson have over Friday? Robinson’s education of Friday recalls

asked by Henry on March 4, 2012
96. ## English Essay

When it comes to conversation, husband and wives often have problems that close friends of the same sex don't have. First, they may not have much to talk about, and second when they do talk. misunderstanding s often developed that lead to major fights. our

asked by san on February 24, 2007
97. ## physics

Explain each of the following questions. ( a) Can an object– Earth system have kinetic energy and not gravitational potential energy? ( b) Can it have gravitational potential energy and not kinetic energy? ( c) Can it have both types of energy at the

asked by matt on October 5, 2010
98. ## college physics

Explain each of the following questions. ( a) Can an object– Earth system have kinetic energy and not gravitational potential energy? ( b) Can it have gravitational potential energy and not kinetic energy? ( c) Can it have both types of energy at the

asked by matt on October 5, 2010
99. ## Composition (Intro Paragraph)

I would like to get a little feedback. I had to write an introduction paragraph of at least 250 words that includes a thesis sentence stating how and why the specific work is more than just a piece of entertainment. The thesis must relate why it is a

asked by Jim on March 27, 2011
100. ## history

What was the Roman Empire’s system of government prior to Julius Caesar that heavily influenced Western democracies? Peasants, including women and slaves, were ruled by kings, barons, and lords. Roman government consisted of a king, crown prince, and an

asked by Kira on September 29, 2017