# 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

91,330 questions, page 194
1. ## Algebra

Tom gets paid $2.80 per hour.overtime rate is 1 and half time more.He got$173.60 for 54hours of work.How many hours did he work overtime?

asked by Ani on November 17, 2015
2. ## science

a cart was pulled for a distance of 1 kilometer and the amount of work accomplished equal 40.000 joules. with what force was the work accomplished?

asked by alex on January 9, 2013
3. ## science

a cart was pulled for a distance of 1 kilometer and the amount of work accomplished equal 40.000 joules. with what force was the work accomplished?

asked by alex on January 9, 2013
4. ## math

okay so I have to work out this problem for school work and I don't understand it. the problem is : if the perimeter of an isosceles triangle is 2x + 10, what is the length of one of the congruent sides ? PLEASE HELP ME !

asked by kayla on June 18, 2014
5. ## Math - Logarithmic

Solve: 2^(5x-6) = 7 My work: log^(5x-6) = log7 5x - 6(log2) = log7 5x = log7 + 6(log2) x = (log7 + log2^6) / 5 And textbook answer: (log7) / (log2) What did I do wrong?

asked by Anonymous on December 13, 2007
6. ## Physics, Math, Aerospace, Engineering

A de-orbit burn, similar (but not the same) to that presented in the previous math problem, has been performed. During this de-orbit burn a pre-calculated ∆V (delta V, change in velocity) of 99.1 meters per second will be used to decrease the Shuttle’s

asked by Wolf on January 3, 2015
7. ## university of oklahoma

A 85-g bullet is fired from a rifle having a barrel 0.582 m long. Choose the origin to be at the location where the bullet begins to move. Then the force (in newtons) exerted by the expanding gas on the bullet is 15750 + 9900x - 27500x2, where x is in

asked by Nawaf on February 28, 2013
8. ## physics

Car Q continue at 26m/s west at the next overpass zip past a cop. The cop begins accelerate 3m/s^2. Eventually cop catches up to car Q who maintained the previous speed(25m/s). Cop side by side motion Q to pull over. A) Determine the time elapsed since cop

9. ## English

1. He still felt fun about the show to watch the dynamic movements of the dancers. 2. He still felt funny about the show to watch the dynamic movements of the dancers. 3. He still felt fun to watch the dynamic movements of the dancers about the show. (Are

asked by rfvv on June 11, 2011
10. ## Chem

Calculate ΔG at 25°C for the precipitation of lead(II) chloride from mixing 100. mL of 0.025 M lead(II) nitrate solution with 100. mL of 0.15 M sodium chloride solution. The ΔG° for the reaction at 25°C = −27.36 kJ/mol. (Hint: write out reaction

asked by Anonymous on February 23, 2014
11. ## Chemistry

Convert the information described below into balanced equation: (a) When a mixture of copper(II) oxide and carbon is heated, elemental copper forms and carbon monoxide evolves into the atmosphere. (b) When a concentrated solution of sodium hydroxide is

asked by Dan on March 12, 2017
12. ## chemistry

(a) The measured pH of a 0.200 M HBr solution at 25°C is 0.806. Calculate the activity coefficient for H . (b) The measured pH of a 0.200 M HNO3 solution at the same temperature is 0.822. Calculate the activity coefficient for H in this solution.

asked by kdawg on February 20, 2014
13. ## health care

If an enrollee uses more services thatn originally assumed per the PPPM calculation, then the plan would a. show a profit for that period b. show a loss for that period c. need a contract renegotiation d. require that the enrollee be dropped from the plan

asked by kisser08 on October 25, 2010
14. ## math

what if ur teach iz a total which? also what happens when you get totaly confused when you have to work out the problems?if don't work out the problems, theni get a 000! That's why the best way to learn is by studying yourself using good books! :) First

asked by katharine on November 14, 2006

A double-slit experiment is performed with light from a Helium Neon Laser on two slits 80 micrometers apart. The first bright interference fringe left of the center is spaced 2m from the bright center. How far away from the double slit is the screen?

asked by kailey on March 3, 2017
16. ## Chemistry

Weight of the Rock Salt Sample: .343 (g) Weight of the Rock Salt Solution: 9.910 (g) Trial #1 Trial #2 Trial #3 Weight of Rock Salt Solution Delivered (g) : .89 1.17 .786 Weight of AgNO3 Solution Delivered (g) : 1.53 .548 .786 Concentration of AgNO3 :

asked by Selena on October 4, 2014
17. ## Math

Tom has green and red tomatoes in a bag a 4 to 3 ratio 5 green tomatoes and 5 red tomatoes were removed making the ratio become 3 to 2 how many red tomatoes were originally in the bag Please show me how to work the problem

asked by Michelle on January 5, 2016
18. ## Social Studies

Western democracies are referred to as representative democracies. They share a common ideology. However, when they transform theory into practice, differences occur. One important difference is a matter of emphasis. Should a system emphasize liberal or

asked by Ashley on October 8, 2008
19. ## History of old Europe

The Middle Ages began with the collapse of... A. Renaissance. B. Roman Empire. C. Kingdom of Mali. D. Tang dynasty. My answer- A Why did the system of feudalism arise drink ht eMiddle Ages? A. to develop an economic system b. to determine jobs within city

asked by dddd47906 on September 15, 2014
20. ## Chemistry

I have two questions: 1. A sample of 10.7 g of CO reacts completely with O2 to form CO2. How many grams of CO2 will be formed? 2. Urea (NH2)2CO is prepared by reacting ammonia with carbon dioxide. The byproduct is water. 637.2 g of ammonia are reacted with

asked by Lauren on March 19, 2011
21. ## Chemistry

You found an unknown metal sample shaped as a cube with each side measuring 2.00 cm. The cube's mass is 48.0 . Your colleague examined the mystery cube with X-ray diffraction and told you that it contains just one element arranged in a body-centered-cubic

asked by Riley on March 18, 2012
22. ## Math

I HAVE NO IDEA WHAT THE ANSWERS ARE JUST PLEASE TELL ME IF THEY ARE WRONG OR RIGHT, PLEASE HELP IF YOU CAN!!!!! 1.-2v-7=-23 A.)15 B.)8*** C.)-8 D.)-15 4.-2(m-30)=-6m A.)-15 B.)-13 C.)-8*** D.)8 5.3n+2=8+2n A.)3 B.)4*** C.)5 D.)6 6.Simplify the expression.

asked by Aaliyah on February 8, 2016
23. ## Problem solving:for 3rd grade

Write a real-world problem that you can solve by adding or subtracting.Then give your problem to a classmate to solve.

asked by Jon on October 25, 2012
24. ## History

I HAVE NO IDEA WHAT THE ANSWERS ARE JUST PLEASE TELL ME IF THEY ARE WRONG OR RIGHT, PLEASE HELP IF YOU CAN!!!!! 1.-2v-7=-23 A.)15 B.)8*** C.)-8 D.)-15 4.-2(m-30)=-6m A.)-15 B.)-13 C.)-8*** D.)8 5.3n+2=8+2n A.)3 B.)4*** C.)5 D.)6 6.Simplify the expression.

asked by Aaliyah on February 8, 2016
25. ## Math

I don't get this at ALL. I don't really need to solve it because it's a bonus question. But I would still like to solve it, because my math teacher is going to give candy out to the people who get this right. 2x^2 + 9x + 5

asked by Barry Vacker on January 29, 2019
26. ## algebra

solve the polynomial y=2x^2-4x+1 I am sure neither your text nor your teacher asked you to "solve the polynomial y=2x^2-4x+1 " are you graphing the function, or are you solving the quadratic y=2x^2-4x+1 ?

asked by Haylee on May 17, 2007
27. ## math help me

an ellipse has an area of 4.17 in^2, and a minor axis that is 2 inch long. solve fot the major axis. how do i solve this?

asked by Anonymous on January 10, 2009
28. ## advanced functions grd 12

im not sure wheer to start and how to do solve this problem solve: cosX(2sinX-3^1/2)=0 ,0

asked by kerry on May 8, 2012
29. ## College Algebra

solve systems of equations by graphing... I get how to graph and solve equations but i just don't understand why its coming out wrong u=v 4u=3v-3

asked by RomanRamirez on September 23, 2008
30. ## math

how do i solve this equestion i don't understan 2(x+1)-3x=3(3+2X) please give me details on how to solve it because i have 100 more to go and i don't understand a thing

asked by brenda on October 30, 2010
31. ## physics

how do I solve for angular momentum if the weight its 700 g and the angular v is (1m=r, 120rmp). I get 12.56 for the v. But i don't know how to solve for the monentum. Also is my v correct?

asked by Levin Need help for test! on November 5, 2014
32. ## Math

Mrs. Lucida has budgeted \$400 for the party. Write and solve the inequality. Solve how many hours the party would last

asked by Anonymous on February 1, 2012
33. ## Calculus

Simplify. State the nonpermissible values. 4a^2-1/4a^2-16*2-a/2a-1 This is what I did to try and solve it out: (2a+1)(2a-1)/(2a+4)(2a-4)*2-a/(2a-1) I cancelled out the (2a-1)'s and don't get how to solve. I'm supposed to get the answer : -2a-1/4(a+2) But I

asked by -Untamed- on December 23, 2011
34. ## Math

T=10d+20 Solve for d. I got T/10-2=d Is this correct? and.... L=9.2+0.17m Solve for m round to nearest hundreth or tenth. I got L/0.17-54.1=m Is this correct? thanks for replying.

asked by Larry on September 29, 2008
35. ## Algebra

Please Solve: 4-x=-5 I thought the answer was -9 but that doesn't seem to be it. Can someone please help? Thanks! This is what I have: 6. 4-x=-5 The problem to solve is: 4-x=-5 Subtract 4 from both sides x = -9 Then divie by -1 Would the answer be 9? To

asked by Angie on June 27, 2009
36. ## math

Jenny wanted to solve the quadratic equation x2 - 11x +18 = 0 by factoring. Which of the following equations would lead her to solve the given equation?

asked by cam on August 30, 2014

An equation is shown below: 4(2x - 5) = 4 Part A: How many solutions does this equation have? (4 points) Part B: What are the solutions to this equation? Show your work. (6 points)

asked by Reb on April 24, 2016

Simplify: ￼ 4sqrt400/4sqrt80 Show your work. 4sqrt400/4sqrt5 = 4sqrt80 4sqrt80=4sqrt16 * 4sqrt5= 2*4sqrt5= 2^4sqrt5 Is this right ?

asked by Ciaria on March 17, 2015
39. ## college algebra

Solve the equation. How do you solve a fraction? X^2/3=1/16 Thanks

asked by Anonymous on March 27, 2013
40. ## y=mx+b

how to solve we solve those types of problems

asked by jasmine on September 16, 2013
41. ## math

solve the following equation algebraically 6=x+2/3 could i get some help on how to solve this?

42. ## Pre-Cal

Solve the equation for the indicated variable: (ax+b)/(cx+d)=6 , Solve for X

asked by Dom on May 25, 2016
43. ## Math

Solve the inequality. -3p > -48 A p < 16 B p > -51 C p < -16 *** D p > 16 Solve the equation -2v - 7 = -23 A 15 B 8 C -8 *** D -15 x/3 - 10 = -12 A -6 *** B -66 C 6 D 66

asked by Anymous on October 10, 2016
44. ## math

asked by timothy on April 21, 2013
45. ## algebra

Solve with fractions. 6x^(2/3)-11x^(1/3)+4=0 How do I solve? Thanks

asked by Anonymous on April 1, 2013
46. ## Math

Solve for area of a trapezoid A= h(b1+b2) 2 Solve for b1

asked by John on October 1, 2013
47. ## Algebra 1 (Reiny)

How am I supposed to solve 2x^0y^-3 when x = 7 and y = -4? Also, what steps must I take to solve x^10/d^-3?

asked by Anonymous on January 23, 2014
48. ## Math

Solve for x: x^4-15X^2+14=0 How would I solve this problem?

asked by Emma on January 10, 2012
49. ## Math

I really, really need help! Solve for the indicated variable. 8x+4y=12 Solve for y. Explanation too, please! Please and thanks!

asked by Izzy. on January 4, 2012
50. ## college algebra

Solve the equation. How do you solve a fraction? X^2/3=1/16 Thanks

asked by Anonymous on March 27, 2013
51. ## Math situations

asked by Sandra M on March 31, 2012
52. ## Maath

Solve the equation for the indicated variable. 5(4r-3c)-2(7r-9c)=0 solve for r

asked by Courtney on August 23, 2010
53. ## Math

Solve each formula for the indicated variable V=xr^2h solve for h. HElp please.

asked by Larry on September 29, 2008
54. ## geometry

how do u solve this geometry question to solve hj=5x jk=7x kh=96?

asked by nicole on September 15, 2011
55. ## Algebra

y=25x+500 solve for x solve for y

asked by karen on November 21, 2014
56. ## algebra

asked by Rick on October 2, 2013
57. ## Math

Solve the linear equation. Solve for x and y y=-3/4x + 1/4 y=3/4x - 3/4

asked by Amy on October 28, 2011
58. ## Math

asked by Petronella on October 4, 2009
59. ## math

Solve to solve for y 4x+10y equals 12

asked by tomeisha on September 16, 2015
60. ## Mathematic

solve x2 + 2x - 3 < 0 and graph. Anyone can solve the problem please.

asked by write2khin on April 13, 2010
61. ## math

Please help me solve the following. Thanks, Write m^p = q using logarithms. Solve (1/e)^2x = 14

asked by Scott on November 28, 2007
62. ## math

how do you solve x/5= -2 i don't understand how to solve it

asked by need help asap on December 16, 2018
63. ## maths

1. solve 10x + 4 = 39 2. solve 4(9x + 2)= 152

asked by anonymous on April 26, 2017
64. ## Algebra 2

Solve: 0 = x3 + 5x2 + 2x – 8 Solve: 0 = x3 – x2 – 11x – 10

asked by Christian on January 13, 2008

URGENT HELP!Squares into Primes Some primes can be expressed as the sum of two squares, as in 13=2^2+3^2; some can't:7=/=a^2+b^2. Other primes can be c^2+2e^2 like 11=3^2+2*1^2; still others are f^2+3 g^2, like 31=2^2+ 3* 3^2. Find all the primes less than

asked by Sara on September 28, 2009

What patterns help you divide? DRaw a picture or make a chart to show how to divide 1600 by 4. Give the quotient. We know the answer but having trouble to make a chart to show the outcome. Please help. Thanks in advance

asked by kim on January 30, 2011
67. ## Chemistry

I have these two questions on my section review that I don't know how to answer. Can someone help me? Please and thank you. 3. Describe in your own words how to prepare 100 mL of a .85 M solution of sodium chloride. 4. If you dissolve 2.00 mol KI in 1.00 L

asked by Ana on April 29, 2010
68. ## Chemistry

An aqueous stock solution is 85.0% H2SO4 by mass and its density is 1.83 g/mL. What volume of this solution is required to make 1.00 L of 1.35 mol/L H2SO4(aq)? Give your answer in millilitres, accurate to three significant figures.

asked by Wes on September 30, 2014
69. ## chemistry

what is the balanced chemical equation for "solid calcium hydrogen carbonate reacts with hydrochloric acid solution producing carbon dioxide,water and calcium ions solution"?

asked by Anabeth on March 6, 2016
70. ## Chemistry

A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 550 mL of a solution that has a concentration of Na+ ions of 0.600 M ?

asked by Lo on October 14, 2015
71. ## Chemistry

My brain refuses to wrap around titration. Problem: Given 150.0 mL of a 1.05 M HCl solution, how many milliliters of a 2.50 M Al(OH)3 solution are required to neutralize the HCl? I think the balanced formula is 3HCl + Al(OH)3 - AlCl +3H20 but that's as far

asked by Wolfmaid on December 7, 2009
72. ## Science

What is the balanced chemical equation for "solid calcium hydrogen carbonate reacts with hydrochloric acid solution producing carbon dioxide,water and calcium ions in solution?"

asked by Anonymous on March 6, 2016
73. ## chemistry

A scientist wants to make a solution of tribasic sodium phosphate, \rm Na_3PO_4, for a laboratory experiment. How many grams of \rm Na_3PO_4 will be needed to produce 250 mL of a solution that has a concentration of \rm Na^+ ions of 0.600 \it M?

asked by Katie on March 30, 2011
74. ## MATH

I have about 30 questions of this, so I need to understand the process. Please make it as detailed as possible! Thank you! Q: To reduce 32 grams of a 25% solution of antiseptic to a 10% solution, how much distilled water should a pharmacist add? A:

asked by LILY on July 21, 2008
75. ## Chemistry

A volume of 60.0mL of aqueous potassium hydroxide (KOH ) was titrated against a standard solution of sulfuric acid (H 2 SO 4 ). What was the molarity of the KOH solution if 25.7mL of 1.50 M H 2 SO 4 was needed? The equation is 2KOH(aq)+H 2 SO 4 (aq)¨K 2

asked by Sarah on September 26, 2013
76. ## Chemistry

A buffer is made by mixing 100 mL of 0.25 M acetic acid (CH3COOH) and 150 mL of 0.10 M sodium acetate (CH3COONa). Calculate the pH of the solution after 0.5g of solid NaOH is added to the solution (Given Ka (CH3COOH) =1.8 x 10-5)

77. ## chemistry

A scientist wants to make a solution of tribasic sodium phosphate, Na_3PO_4, for a laboratory experiment. How many grams of Na_3PO_4 will be needed to produce 550 mL of a solution that has a concentration of Na^+ ions of 0.500 it M?

asked by Anonymous on November 11, 2010
78. ## Chemistry

An aqueous salt solution is formed by adding 11.67 g sodium sulfate (solute) to water (solvent). What mass (in g) of water is used if the freezing point of the solution is -12.9 Farenheit. Kf H2O = 1.86 Celsius/m

asked by jenny on February 24, 2012
79. ## Chemistry partial molar volumes

The partial molar volumes of the CCl4 and benzene are 122cm3/mol and 98.0 cm3/mol, respectively in a solution in which mole fraction of chloroform is 0.2. Calculate the volume occupied by 2.5 moles of the solution. Thank yOu.

asked by Urgent pls. on August 24, 2011
80. ## Chemistry

Hello, I have a question about something we learned in chemistry today. We've been going over Ka/Kb table values, and using them to determine if a solution is acidic, basic or neutral. One of the compounds (in aqueous solution) are NH4OCl (aq), which is

asked by Sally on May 18, 2010
81. ## science

The solubility of sodium chloride is 36.0 g/100. ml of water, and the density of saturated NaCl solution is 1.202 g/mL.. I have 500. mL of a 1.00 M NaCl solution. If I boil it to the point of saturation, what is the final volume?

asked by Nasser on July 25, 2012
82. ## Chemistry

What type of reaction occurs when potassiumbromide solution is mixed. With lead(II) acetate solution? Gas evolution, oxidation reduction, precipitation, acid-base neutralization, or no reaction

asked by Coug on January 8, 2010

A 0.2mol/L solution of KMnO4 has been added to 10 ml of 0.5mol/L acidified FeSO4. write the balance equation of the reacttion then calculate the volume of the oxidizing solution that should be added to oxidize all the Fe^2+ ions. please help and thank

84. ## chemistry

The pH of 100 mL of a 0.10 M aqueous solution of Compound Z is 11.30. (a) Is Z an acid, a base, neither, or cannot be determined? Justify your choice. (b) Write the relevant Bronsted-Lowry equation showing how Z behaves in aqueous solution

asked by alexis on August 3, 2008
85. ## Chemistry

How to find the mass of a solid formed when: 45.00ml solution of 0.003 800 mol/L lead (II) nitrate is mine dish a 30.00 mL solution of 0.08800 mol/L strontium iodide

asked by Sam on November 29, 2015
86. ## Chemistry

I am really stuck on these 2 questions: 1. Why was 2M HNO3 added before adding 0.05M AgN03? 2.Write a full equation b.) an ionic equation between silver nitrate solution and sodium chloride solution.

asked by Mahta on March 9, 2010
87. ## chemistry

A scientist wants to make a solution of tribasic sodium phosphate,Na3PO4 , for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 550 ml of a solution that has a concentration of Na+ ions of 1.40M ?

asked by ASh on February 7, 2012
88. ## Chemistry

Express the concentration of a 0.0510 M aqueous solution of fluoride, F-, in mass percentage and in parts per million. Assume the desnity of the solution is 1.00 g/mL Since, we're assuming the density I think that also means were assuming the volume.. but

asked by Joy on February 19, 2012
89. ## Chemistry

The electrolysis of 250ml of a brine solution was carried out for a period of 20mins with a current of 2A. The resulting solution was titrated with 0.62M HCL. How many ml of HCL would be required to achieve natural point

asked by Shilpa saxena on May 19, 2017
90. ## Chemistry

What is the concentration of methanol in a solution prepared by combining 7.85mL of a 3.693M methanol solution with 17.50mL of water? Assume volumes are additive and report your answer to 3 decimal places.

91. ## chemistry

You add thiocynanate ions to a solution The molarity of silver ion is 0.1M initially. Calculate the max concentration of SCN- ion that exists in the solution before AgSCN beings to precipitate? ?

asked by emily on March 15, 2011
92. ## chemistry

A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 500 mL of a solution that has a concentration of Na+ ions of 0.700 M

asked by ionic on March 27, 2011
93. ## chemistry

A solution contains 0.20 M Cl- and 0.20 M SO4^2-. a) identify a cation that could be added to the solution to give a precipitate with only one of these anions. MY answer: Cu+ b) write the net ionic equation for the precipitation reaction in part a) MY

asked by Anonymous on December 11, 2014
94. ## AP Chemistry

A 2.685 g sample of KHC8H4O4 was dissolved in water and uses to standardize a NaOH solution. The endpoint was reached after 38.25mL of titrant were delivered. Find the molar concentration of the NaOH solution.

asked by Rebecca on February 4, 2018
95. ## Chemistry

How many grams of glycerin C3H8O3 must be dissolved in 375.9g of water at 100 degrees Celsius to reduce the pressure of water above the solution to 714.6mmHg. The solution is a non-volatile compound

asked by Jude on April 23, 2011
96. ## General Chem lab

Hi, how do I calculate how many grams of unknown diprotic acid are needed to make 150mL of 0.750N (normal) solution? and to make 125mL of 0.500M (molar) solution? we have 0.5000M of NaOH.. Please help me...

asked by Ashley on October 30, 2011
97. ## Chemistry

What mass of sucrose (C12H22O11) should be combined with 477g of water to make a solution with an osmotic pressure of 8.15atm at 275K ? (Assume the density of the solution to be equal to the density of the solvent.)

asked by chemstud on February 8, 2015
98. ## chemistry

A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 450 mL of a solution that has a concentration of Na+ ions of 0.700 M

asked by allen on March 27, 2011
99. ## Chemistry

A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 400mL of a solution that has a concentration of Na+ ions of 1.10M ?

asked by Ashley on September 24, 2014