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 249
1. mat116

Graph the system of inequalities: x+3y or= 0

asked by Suzanne on November 16, 2010
2. ENDOCIRNE SYSTEM

HOW ENDOCRINE SYSTEM FUNCTION

asked by ALEJANDRO on September 13, 2011
3. Algebra

Graphing the system of inequalities. y>= -5 x>= 6

asked by Tina on October 10, 2009
4. math

Evaluate (3 + 4) + 1 in the mod 5 system

asked by mike on November 14, 2010
5. science

What is the definition of "Organ System"?

asked by Erin on January 20, 2011
6. Algebra

1. I need help solving the system by substitution -x-y-z=-8 -4x+4y+5z=7 2x+2z=4

asked by Samantha on October 9, 2017
7. IT

why is system Burn-in important?

asked by michael on May 15, 2016
8. math116

What does it mean for a system to be consistent or inconsistent?

asked by Anonymous on March 19, 2010
9. science

this system gives the body its shape

asked by monesh on October 5, 2017
10. Algebra 2

Complete the system for no possible solutions: x+y+z = 7 y+z = ? y+z=?

asked by BC on October 14, 2010
11. English

Other people said they had invented the system.

asked by Leslie on December 17, 2018
12. World History

What is the basis of the feudal system?

asked by Losa on October 24, 2012
13. math

Conversions in the Metric System

asked by Anonymous on March 14, 2017
14. Informaton Technology

Why is system Burn-in important?

asked by Sherzz on May 14, 2016
15. Chemistry

Find the pH of mixture of acids. 0.185 M in HCHO2 and 0.225 M in HC2H3O2 Im using an ice chart of weak acid and putting in strong acid in H+ initiAL concentration. I've done the problems many different ways but cannot seem to get the right answer help

asked by L.Bianchessi on February 26, 2012
16. physics

A horizontal spring attached to a wall has a force constant of 800 N/m. A block of mass 1.10 kg is attached to the spring and oscillates freely on a horizontal, frictionless surface as in the figure below. The initial goal of this problem is to find the

asked by Anonymous on September 27, 2011
17. math

Percents Unit Test 1.   Write a ratio and a percent for the shaded area.  (1 point) , 25% , 31.25% , 20% , 25% 2.   Model 25% on a  grid.  (1 point) 3.   Write the ratio as a percent. In the small country of Varia, a bill becomes law only if

asked by Fun on June 21, 2018
18. Chemistry

Can someone please explain how to do this problem? I am really confused. Thank you. 3. How much heat does 32.0 grams of water absorb when it is heated from 25.0 degrees Celsius to 80.0 degrees Celsius? q = mass*specific heat water*(Tfinal-Tinitial) = ??.

asked by Amy on July 19, 2007
19. physics

If 80% of a piece of wood is submerged in water before oil is added, find the fraction submjerged when oil with a density of 781 kg/m^3 covers the block. (Don't neglect the buoyant force of air before the oil is added). I thought to find the density of

asked by tmaria on June 19, 2007
20. PHYSICS

Identify the following gas compression descriptions as adiabatic, isothermal or isobaric. a. As the gas compresses, the internal energy ÄU, decreases when the temperature decreases; the work done on the gas is greater than the heat removed from the gas:

asked by GRISSELL on March 3, 2012
21. physics

Answer the following question:Be sure to show all work. Include formulae and units.Be sure to include relavant, meaningful diagram and a complete circuit diagram with circuit related problem. take enough space, don't try to squeeze everything on a small

asked by titu on April 17, 2015
22. college algebra

4. The yearly cost T, in thousands of dollars, of tuition and required fees at a private college (includes two- and four-year schools and does not include room and board) can be approximated by T= 3/5n + 5 where n is the number of years since 1985. That

asked by Kim on May 9, 2010
23. Chemistry

1. A bottle of juice at room temperature is placed in a bucket of ice inside a box. The box, bottle, and bucket of ice represent a closed system. Which of the following statements is true? (2.0 points) (Points : 2) Heat flows from the ice to the juice

asked by jeje on March 14, 2011
24. english

Choose and Place MLA, APA, or Both in the blank. _____1. In a work with a single author, the author’s last name and initials are listed in the works cited entries. _____2. In a work with a single author, the author’s full last name and first name are

asked by john on April 8, 2012
25. Unit 4 - Memory, Thinking, and Intelligence

research Spearman's Model of Intelligence and Gardner's Multiple Intelligences. Based on your findings, compare and contrast the two models. Provide several comparisons and several contrasts. Which of the two models do you feel is more in line with

asked by candy on September 21, 2006
26. chemistry

I need help on these questions. They all seem pretty similar i think? i don't know what formula i am suppose to use. And what does nonvolatile mean? is that like a clue or something? 1) 2.6 g of the nonvolatile solute sucrose (C12H22O11) is added to 465 g

asked by confusedkid on January 24, 2009
27. spanish

Can you please help me with my spanish homework :? ~.~.~.~.~.~. I did most of it,but I'm stuck on a few,so please help :) ~.~.~.~.~.~. You are a contestant on a game show. The host of the show has given you these answers. Write the corresponding questions

asked by greg on April 20, 2008
28. physics

Work Energy Lab a. What assumptions have been made in performing law of conversation of energy and analyzing the results? b. Which forces are directly responsible for generating ÄQ? c. How much work do these forces collectively (as opposed to

asked by mas on October 4, 2010
29. Physics

The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. (a) Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed of a person situated at

asked by Ryan on September 30, 2016
30. Planning

describe what you think will be your major challenges in getting and keeping part or full time employment in the next two years. Since I don't work right now, I am usually with my family, at home, not really that busy. So once I start working, I think my

asked by Anonymous on April 21, 2011
31. math/algebra

I have been asked to answer questions in parts in relation to a story problem, but I am having difficulty finding the right formulas. Did I do this right...If not, please help me and tell me where I went wrong. Part B The landscaper that maintains Mrs.

asked by Anna please HELP, I need this by 7:00 on November 19, 2009
32. Calculus - Math

Sorry in advance - it's a very wordy, multi part question. The parts with the ..........are the parts that require an answer. I have no idea where to begin or what to do to solve this. We will determine the volume obtained when revolving the solid bound by

asked by Sarah on October 31, 2011
33. geometry

BD is a perpendicular bisector of triangle ABC. XZ is a perpendicular bisector of triangle WXY. Triangle ABC is similar to triangle WXY with a scale factor of 1:2. Part I. Find BD, AB, WZ, XZ and WX. Part II. What is the scale factor of the perimeters of

asked by Amira on April 29, 2010
34. another geometry question

BD is a perpendicular bisector of triangle ABC. XZ is a perpendicular bisector of triangle WXY. Triangle ABC is similar to triangle WXY with a scale factor of 1:2. Part I. Find BD, AB, WZ, XZ and WX. Part II. What is the scale factor of the perimeters of

asked by mike on May 7, 2007
35. Chem

2. Suppose a chemistry student made 2000. mL of 6.00 M HCl. He accidently spilled half of this solution on the floor. What is the Molarity of HCL left in the beaker? Explain the answer... - for this problem, would I use the eq'N, M1V1=M2V2. 3. What is the

asked by Lina on January 31, 2017
36. chemistry

Would the following errors cause an increase or decrease in absorbance and % Transmittance? insoluble particles were accidentally pipetted into the cuvette with the solution the cuvette was wet and not prerinsed with the solution. fingerprints were not

asked by jared on May 10, 2007
37. Math

A solution of 10% sulfuric acid and one of 25% sulfuric acid are to be used to make 500 ml of 20% sulfuric acid. How many ml of each solution needs to be used in the mixture? (round answers to the nearest ml)

asked by Kira on September 8, 2015
38. probability

Two questions: 1. Assume a building has two independent security alarm systems. The first system works for 80% of the time and the second works 70% of the time. What percentage of time is the building protected by at least one security alarm system? Please

asked by Karen on June 6, 2014
39. physics hey bob

you help me solve this problem. but how am i suppose to if i don't know the mass of the car? on a level road the stopping distance for an automobile is 35.0m for an initail speed of 90 km/hr what is the stopping distance of the same automobile on a simalr

asked by anthony on October 31, 2010
40. Computer science

As a member of the Information Security team at a small college, you have been made the project manager to install an access control system (ACS) in a dormitory. The ACS will automatically unlock the dormitory doors via an electronic proximity reader and

asked by Kelon on July 22, 2012
41. Computer science

As a member of the Information Security team at a small college, you have been made the project manager to install an access control system (ACS) in a dormitory. The ACS will automatically unlock the dormitory doors via an electronic proximity reader and

asked by Kelon on July 17, 2012
42. Geometry

1. In the formula -2x-y=7, what is the slope? 2. An isoceles trapezoid has____pair(s) of parallel sides. 3. Is a triangle with sides of 6,8, and 10, a right triangle? yes or no. 4.Find the area of the rectangle(30cm, 40cm,40cm. 5. Use factoring to simplify

asked by Patricia on April 15, 2010
43. algebra

In this equation or question: translate the following text into an equation involving ratios and solve it. " Anne is paid \$45 per hour, if she worked 55 hours in a particular week, how much will she be paid that week? 45/1 = x/55: cross multiply and solve

asked by Johnny on June 22, 2014
44. chemistry

An aqueous solution contains three solutes. One liter contains: 0.200 moles of calcium chloride, 0.150 moles of magnesium chloride, and 0.750 moles of sodium chloride. How many grams of Cl are there per liter of this solution? a. 39.0 g b. 51.4 g c. 78.0 g

asked by Lisa on October 24, 2015
45. chemistry

Calculate the volume of 1.00 M acetic acid solution and mass of sodium acetate needed to make 250 mL of a 0.450 M acetic acid/acetate buffer solution with a pH of 4.00. (The pKa is 4.74 for acetic acid).

asked by eddie on November 3, 2014
46. Math

How do you find the percentage of a number? I have no clue how you do that. An example I have is 850 students are attending a camp, 38% of them play musical instruments. What number of people play instruments? I don't get how to solve that and here's

asked by Jessie on October 22, 2012
47. Pre-Calculus

Use applications of exponential functions and logarithmic functions to solve. The half-life of plutonium 241 is 14.4 years.If 100 grams is present now, How much will it take to reach 2 grams of plutonium 241? y=a(1/2)^(t/14.4) How do I solve for t? I'm not

asked by Suga on December 14, 2017
48. math

1.What is the diameter of a sphere that has a volume of 3052.08 m^3? My answer is: 9m 2.What is the radius of a sphere that has a volume of 2304π m^3? My answer is:12m ~If i get it wrong please explain it to me how to get it, i know the formula and how to

asked by Jakis on February 21, 2017

1. solve sqrt (11-x) = sqrt(x-7) choices are 6,7,8 or9 I think according to my calcs the answer is (9) The range of f(x) = sqrt(3x-6) - 2 answers would be y= (-2) y> (-2) y

asked by Erica on January 8, 2011
50. physics

A helicopter lifts a 70 kg astronaut 13 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/10. (a) How much work is done on the astronaut by the force from the helicopter? J (b) How much work is done on the astronaut by

asked by Anonymous on October 1, 2009
51. math

write all the steps to solve the following problem. explain your steps as you solve it. a certain computer can perform 10^5 calculations per second. how many calculations can it perform in 10 seconds?

asked by math help asap on November 12, 2014
52. Math

Solve for the missing variable: ALL FIGURES ARE SIMILAR. Figure 1: 8m-side 1 and 6m-side 2. Figure 2: 20m-side 1 and r meters-side 2. r=? Solve for r. Can you help me? Thank you.

asked by Happyface on August 22, 2008
53. Math

1) Solve for x and check Radical (x^2-10x)=3i 2) Simplify (5+ Radical 2)/(5-Radical 2) 3)describe the nature of the roots x^2-x-6=0 x^2+4x+29=0 4) Solve for x and check Radical (x^2 +4x +44) +3=2x I got 7 and -5/3 as answers, was not sure though

asked by JP on December 11, 2008
54. Career

1.)How people produce, distribute, and use goods and services? a.) Economy b.) Free enterprise system c.) Competition d.) Profit 2.)The amount of goods and services available for sale. a.) Producers b.) Consumers c.) Supply d.) Demand 3.)The amount of

asked by Amanda on April 30, 2015
55. environmental science

what causes salinization? Poor drainage, semi-arid or arid region of the world, water table 2-3 meters from the surface are some of the reasons. You can go to www.google.com and type in salinization. There are a number of articles there worth reading. need

asked by Toni on September 15, 2006
56. Simple interest!

Kenneth recentley started a new job. his starting gross monthly salary was 3200. Each year on the anniversary of his starting date, kenneth is promised a 7% raise. If keneth works for 5 years what was his gross annual income in his fifth year of work? my

asked by brandy! on October 19, 2006
57. Algebra

Natalie earns \$2.50 for each CD she sells and \$3.50 for each DVD she sells. Natalie sold 45 DVDs last year. She earned a total of \$780 last year selling CDs and DVDs. Write an equation that can be used to determine the number of CDs (c) Natalie sold last

asked by Amy on February 17, 2013
58. Algebra

Natalie earns \$2.50 for each CD she sells and \$3.50 for each DVD she sells. Natalie sold 45 DVDs last year. She earned a total of \$780 last year selling CDs and DVDs. Write an equation that can be used to determine the number of CDs (c) Natalie sold last

asked by Sylvie on February 16, 2013
59. calculus

A tank with a rectangular base and rectangular sides is to be open at the top. It is to be constructed so that its width is 4 meters and its volume is 36 cubic meters. Building the tank costs \$10 per square meter for the base and \$5 per square meter for

asked by john on December 12, 2011
60. Chemistry

I found this on the internet and I need an explanation. Q: You want to make sure a large weather balloon does not burst and wish to check the temperature at 3000 meters altitude. The balloon manufacture guarantees the balloon up to 60.0 Liters in size.

asked by Jane on March 22, 2015
61. Social Studies Pretest Lesson 1 Unit 7

1: Why is urbanization associated with the Industrial Revolution? A:The expansion of family farms refocused the nation on agriculture. B:The concentration of factories in cities brought job opportunities. C: Settlers expanded the frontier West of the

asked by Reeces on December 7, 2016
62. ALgebra

A theatre production company donated free tickets for their show to the local Boys & Girls club. They claimed that the ticket value was \$306. A child's ticket cost \$5.25 and an adult ticket cost \$9.75. If there were three times as many children's tickets

asked by Alison on June 12, 2014
63. 6th Grade Math

Carmen received some money for her birthday on Friday. That night, she took her friend out to dinner. She spent half of her check for dinner. Then she tipped the waiter \$6. The next evening she went to dinner alone, she spent half of the money she had

asked by Brandi on March 30, 2009
64. probability

a teacher on her way to work passes through 3 stoplights each morning. the distances between the stop lights are great and the lights operate independently of each other. if the probability of the red lights are .4,.8 and .6 for each light, what is the

asked by Lindsey on February 25, 2014
65. calculus

Eight and one-half foot-pounds of work is required to compress a spring 3 inches from its natural length. Find the work required to compress the spring an additional one-half inch. (Round your answer to two decimal places.)

asked by fgm on January 25, 2012
66. Physics

(a) Determine the amount of work (in joules) that must be done on a 95 kg payload to elevate it to a height of 1007 km above the Earth's surface. ANSWER in MJ (b) Determine the amount of additional work that is required to put the payload into circular

asked by Steve on March 22, 2011
67. Physics

A construction crew pulls up an 87.5-kg load using a rope thrown over a pulley and pulled by an electric motor. They lift the load 15.1 m and it arrives with a speed of 15.6 m/s having started from rest. Assume that acceleration was not constant. a. How

asked by Anonymous on July 31, 2012
68. Physics

A basketball player makes a jump shot. The 0.650-kg ball is released at a height of 1.80 m above the floor with a speed of 7.80 m/s. The ball goes through the net 3.10 m above the floor at a speed of 4.40 m/s. What is the work done on the ball by air

asked by A on March 6, 2018
69. Physics

A construction crew pulls up an 87.5-kg load using a rope thrown over a pulley and pulled by an electric motor. They lift the load 15.1 m and it arrives with a speed of 15.6 m/s having started from rest. Assume that acceleration was not constant. a. How

asked by Anonymous on July 31, 2012
70. physics

Calculate the work required to be done to stop a car of 250 kg moving at a speed of 18km/hr? answer is right or not please check Mass =250 kg Velocity = 18kg = 18 x 1000/60 x 60 = 5 m/s KE = ½ mv x v = ½ x 250 x 5 = 125 x 5 = 625 J Therefore the counter

asked by Evangelin Lenin on December 31, 2015
71. Grammar

1.Which of the following sentences have (unreduced) compound clauses? Briefly explain your answer. a.I like cities with parks and public sculptures. b.Everyday he either burns the toast or overcooks the eggs. c.Neither does he drink nor does he swear.

asked by Nora on April 7, 2009
72. Algebra

Use the five steps for problem solving. Enrollment at a particular online university is 11,600. There are seven times as many students who work full time as there are students who do not. How many students work full time and how many do not?

asked by Poochie on July 10, 2011
73. Algebra

Use the five steps for solving problems Enrollment at a particular online university is 11,600. There are seven times as many students who work full time as there are students who do not. How many students work full time and how many do not?

asked by Poochie on July 10, 2011
74. Engineering science

A water pump produces 9KL of water per hour at a height of 70 m above the pump.The pump is driven by a 3 KW electric motor.calculate. 1) The work done per hour 2) The work done per minute

asked by Thulani on September 27, 2014
75. physics

a 5.0 kg mass hangs at the end of a cord. Find the tension in the cord if the acceleration of the mass is 1.5 m/s squared up. I'm trying to find the formula (s) to plug in the numbers to work the problem. if you can help me with the formulas and plugging

asked by courtland on February 5, 2010
76. Finance

Sauerfood company has decided to buy a new computer system with an expected life of 3 yrs. the cost is 150,000.the comapny can borrow \$150,000 for 3yrs at 10% annual interest or for one yr at 8% annual interest. How much wld sauer save in interest over the

asked by Nancy on November 8, 2010

what clothes are dentists required to wear to work? who will pay for the clothes that they wear to work?

asked by melissa on April 18, 2009
78. math

Number of days taken by 1 man to complete the same work is less than by number of days taken by 1 women to do this work?

asked by renjith on May 17, 2017
79. physics

How much power is required to do 110 J of work on an object in a time of 0.4 s? W How much power is required if the same work is done in 5 s? W

asked by james on January 23, 2012
80. Math

3. A can do a piece of work in 6 days. B is 50% more efficient. The number of days it take B to do work is A. 9 B. 3 C. 2 D. 4 Is the answer 4? If so, how did you get your answer?

asked by 7th grade Math on August 13, 2015
81. maths ( mental ability)

P can do a piece of work in 9 days. Q is 50% more efficient than P. The number of days it takes Q to do the same piece of work is?

asked by rupesh on November 2, 2009
82. math

10 men can do a piece of work in 10 days.how many days can 100 men take to do the same amount of work?

asked by mary on July 24, 2009
83. Statistics

cant tell if i am on right track for this prababilitly hw assigment help would good! I was recently given a hw assigment dealing with the price is right's "money game". The contestant is shown nine cards on a board. Each card has one pair of numbers. One

asked by Mike jenkins on July 18, 2012
84. psy

Please help, very lost Eric has computed that it takes an average (mean) of 17 minutes with a standard deviation of 3 minutes to drive from home, park the car, and walk to his job. One day it took Eric 21 minutes to get to work. You would use the formula

asked by mary on February 1, 2010
85. psycholgy

Please help, very lost Eric has computed that it takes an average (mean) of 17 minutes with a standard deviation of 3 minutes to drive from home, park the car, and walk to his job. One day it took Eric 21 minutes to get to work. You would use the formula

asked by mary on February 1, 2010
86. algebra

Okay, how do you factor a polynomial when there is a number in front of the highest x term. For example: how would you factor 2x^2-11x+15 i know the answer is (2x-5)(x-3), right? So you put the 2x on one side and then you put an x on the other. And then

asked by Fidelia on May 15, 2007
87. English Improving writing

Ok this what I have now Thanks to all of you for your help Brain storming revised The problem is Jack and Rachel often has nothing to do Bonnie and Molly is working extra and have to work over time Melanie and Jessica share an administrative assistant

asked by Kaleigh-Anne on June 9, 2008
88. algebra 2

Would some one look at these problems and see if I got them right Thanks Just let me if they are wrong so I can go back over them 1.Write in simplest form 48/56 A. 6/7 2.Multiply 8x^3/5 *10/x^3 A. 16/x^4 3.Divide 4/x^7 / 12/x^3 A. 1/3x^2 4. divide

asked by CINDY on June 1, 2007
89. Math

You are given two equations which are both true, and you are asked to solve for both x and y. You plan to solve this set of equations by substituting part of one equation into the other so you end up with an equation that contains only x's or only y's. The

asked by Jen on October 7, 2008
90. Math 102

if you have a pizza with a diameter of 20 that is cut equally into 4 pieces, one way horizontal and one way vertical. how do i figure out where to place 2 non-center vertical cuts so that the pizza has 8 equal parts? i found the area for the circle to be

asked by Nick on April 27, 2010
91. physics

A typical problem in physics is that physical quantities can be calculated for a series of ﬁnite systems, but ultimately, we would like to know the results for the inﬁnite system. Hulthen (1938) studied the one-dimensional Spin Heisenberg model with

asked by Kedir on November 2, 2018
92. Chemistry

When 0.100 L of 0.200 M K2C2O4 react with 0.150 L of 0.250 M BaBr2, BaC2O4 forms an insoluble precipitate. Calculate the final concentrations of the ions that remain in solution after the reaction. I know how to get the net ionic equation (Ba2+ + C2O4- ->

asked by Anonymoose on October 1, 2018
93. Chemistry

A solution of sodium hydroxide is standard- ized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the following data, calculate the molarity of the NaOH solution: mass of KHP 1.654 g; buret reading before titration 0.23 mL;

asked by Broy on October 4, 2011
94. Chemistry

Lead(II) nitrate solution reacts with potassium iodide solution to produce lead(II) iodide and potassium nitrate. The answer in the book is: Pb(NO3)2(aq) + 2 KI(aq) ---> 2KNO3(aq) + PbI2(s) I understand how to write and balance the equation. However, I am

asked by Jeff on January 28, 2011
95. Science

this my science homework about milo so yeah if you can answer these would be great. What is the solute? What is the solvent? Was the mixture a solution or a suspension explains why? Which part of the mixture is the sediment? Explain why the particles

asked by Jeremy Yea on May 30, 2010
96. science

an unknown molarity of HCl acts as an analyte.50mL of it is placed into a conical flask ans a 0.1M of solution of NaOH was used as a reagent. The endpoint is pH=7, with a pKa of 6.5 chosen.The colour of the solution changed when 10mL of 0.1012M NaOH WAS

asked by constance modongo on October 16, 2018
97. AP chemistry

A solution of sodium hydroxide is standard- ized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the following data, calculate the molarity of the NaOH solution: mass of KHP 1.894 g; buret reading before titration 0.13 mL;

asked by Anonymous on October 24, 2010
98. chemistry

A solution of sodium hydroxide is standard- ized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the following data, calculate the molarity of the NaOH solution: mass of KHP 1.744 g; buret reading before titration 0.13 mL;

asked by cheri on September 19, 2012
99. Math

Hi! Okay so I started to attempt this math problem; 3cot^2x-1=0. However, I'm a little stuck. My teacher wants me to find the Location on The Unit Circle, Period, and General Solution. Can someone check what I have and help me with the rest? 3cot^2x-1=0

asked by Oscar on January 26, 2015
100. Hayden

Chloroacetic acid has a relatively large equilibrium constant, so at low acid concentrations it is necessary to use the quadratic equation in order to calculate the concentrations of the aqueous species. Ka for ClCH2COOH is 1.4 ´ 10-3. For the problems

asked by leona on June 19, 2010