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 89
1. Maths

How do you work out and show difference between 2 numbers i.e 60 students and 40 students out of 100

asked by Shannon on February 16, 2011
2. Math

If a rule is (3x,y) and a scale factor of 4 is used to transform it , what will the new rule be??? Show work

asked by Jessica on March 27, 2007
3. algebra

Given the function f(x)=7-(1/8)x ,find a formula for the inverse function. show work.

asked by Davone on May 10, 2014
4. Math- urgent

If slope= 4;(3,8) what would be the equation in point-slope form? Please show your work.

asked by Sarah on February 5, 2014
5. math

find the slope of the given line if it is defind. the line through (2,5) and (0,8) please show work

asked by jackie on January 26, 2013
6. Math (Algebra/Pre-Algebra)

What is the x-intercept of the line with equation 2y + 3x = 24? What is the x-intercept and how do I find it? I have to show work. Thank you!

asked by Samantha on June 4, 2009
7. math

eight time a number is ten more than three times the number...please show your work

asked by ellie on August 1, 2016
8. algebra

Find the x and y intercepts: 3x - 2y = -12 i know the anwser is (2 , -3) but how do i show the work that i found that anwser?

asked by sami on October 21, 2010
9. Algebra 2

Solving Quadratic Systems x^2+y^2=20 x^2-6y=28 PLEASE SHOW WORK I'M HAVING TROUBLE SOLVING IT

asked by Alicia on December 1, 2014
10. Algebra 2

Solving Quadratic Systems x^2+y^2=2 x^2-6y=10 Please show work I'm having trouble solving it

asked by Alicia on December 1, 2014
11. Algebra 2

Solving Quadratic Systems 2x^2+5y^2=53 4x+y^2=17 Please show work I'm having trouble solving it.

asked by Alicia on November 29, 2014
12. math

the sum of two numbers is 51. Twice the first plus 4 times the second is 128. What are the numbers? Show your work.

asked by allan on January 19, 2010
13. geometry

11. Show your work. PB is a line segment on a number line. It had endpoints at -2

asked by Dokkan on August 29, 2017
14. algebra

Find the x- and y-intercepts for the equation. Please show all of your work. Then graph the equation 2x + 3y = 15

asked by nicole on November 1, 2011
15. Pre Calc

Simplify and show work step by step cos²θ + sin² = ???

asked by Huh on November 30, 2010
16. math

Bob has 4 more dimes than nickels. He has 1.45 in all. How many nickels does he have? Please explain and show your work.

asked by Chloe on January 4, 2010
17. Physical science

The photo-electric effect has many practical applications.A photocell, used in burglar system such application.The work function of the metal used as a cathode in the photocell is 8,7 times 10^-19J. Calculate the velocity at which the electrons are

asked by Tamara on October 11, 2010
18. chemistry

2 mol of solid iron (C = 25.1 J/(mol K)) is heated from 20C to 200C. How much does its internal energy change? U = q +W but no matter exchange so work is 0. then U=q=9036J But why is q not negative since isnt the system loses its heat to the surrounding

asked by eng on March 9, 2010
19. statistics

Times for a surgical procedure are normally distributed. Method A has a mean of 28 minutes and a standard deviation of 2 minutes for completion. What is the probability that a surgical procedure conducted by method A takes at most 33 minutes to complete?

asked by Matthew on March 17, 2012
20. Math

In Super Bowl I, the Green Bay Packers defeated the Kansas City chiefs by a score of 35 to 10. The total points came from 13 different scoring plays, which were a combination of touchdowns, extra point kicks, and field goals, worth 6, 1, and 3 points

asked by David on February 1, 2016
21. chemistry

a sodium hydroxide solution was prepared according to the procedure outlined in this weeks experiment. This sodium hydroxide solution was standardized by by titration against exactly 10mL of a 0.28M hydrochloric acid solution. In three titrations, the

asked by Kacie on November 25, 2012
22. Math

Can you show me the work to get these answers also? A.Solve each equation. Leave exact answers: 1.5^3x-2=14 2.log(x-1)-logx=log(x-3) B.If f(x)=x+2/x and g(x)=7/x-5, a. Find the composition (f o g)(x) and simplify completely. b. Find the domain of (f o

asked by Jeff on December 8, 2013

The human heart is an organ that is made up of cells. Not all of the cells that make up the heart are identical, however. What name is given to a group of similar cells that perform a special function and together make up an organ? A) embryo B) organelle

24. Anatomy & Physiology

The pancreas is part of the digestive system because the pancreas secretes enzymes that digest foods. Because it produces hormones such as insulin and glucagon, the pancreas is also part of the endocrine system. List two other organs that are parts of

asked by morgan on August 23, 2018
25. TRIG

1) Find an angle that makes the statement true: costheta =sin(3theta+10degrees) 2) Verify this proof: sec(Pie -x)= -secx Can someone show me how to solve for these. Very much appreciated!

asked by ALISON on October 23, 2011
26. math

find total amount due on loan,round to nearest cent.\$600 = principal Rate=2% time in Years=2 show steps to solve and answer

asked by Anonymous on December 5, 2012

Please show me how to solve this problem. A person wearing a shoulder harness can survive a car crash if the acceleration is less that -300 m/s2. How far must the front end collapse if it crashes while going 101 km/hr? Thanks.

asked by mike on February 14, 2010

Maurice drove 400 km from Edmonton to Battleford in 1 hour less time than it took Martin to drive the same route from Battleford to Edmonton. If Maurice drove 20 km/h faster than Martin, at what speed did each of them drive? Show a complete algebraic

asked by Shay on February 25, 2007
29. algebra

Maurice drove 400 km from Edmonton to Battleford in 1 hour less time than it took Martin to drive the same route from Battleford to Edmonton. If Maurice drove 20 km/h faster than Martin, at what speed did each of them drive? Show a complete algebraic

asked by Shay on February 25, 2007
30. Linear Algebra

Let v1 = (1, 0, −1) v2 = (0, 2, 2) v3 = (−3, 4, 7) and let W = Span{v1, v2, v3}. 1. Show that v3 is a linear combination c1v1 + c2v2 of v1 and v2 by finding the constants c1 and c2. 2. Show that W = Span{v1, v2}. 3. Show that v1 and v2 are linearly

asked by Zabe on November 11, 2016
31. TRIANGLE HELP!!!! (MATH!)

The two triangles above are similar. a. Find x using the ratio of the sides 12 cm and 16 cm: x/20 = 12/16 Show your work. b. Find x using the ratio of the sides 6 cm and 8 cm. Show your work. c. Explain why the answers to (a) and (b) should be the same.

asked by Agal on November 17, 2016
32. AP CHEM

Please help me with these AP Chemistry homework problems and show me the steps how to find the solutions: Liquid-Liquid Tirations: What is the concentration of the unkown solution for each of the following titrations? #5) 25.36 mL of 0.178 M NaOH is

asked by shylo on July 31, 2008
33. Computer Science

public class PrimeNumbers { public static void main(String[] args) { int x = 100; for(int i=2; i

asked by Jake on July 30, 2015
34. PHYSICS

The only force acting on a particle is conservative force F. If the particle is at point A, the potential energy of the system associated with F and the particle is 39 J. If the particle moves from point A to point B, the work done on the particle by F is

asked by Sara on April 17, 2013
35. MATH!!!

(1)TOP Electronics is a small business with five employees.The mean(avergae) weekly salary for the five emplyees is \$360. If the weekly salaries of four of the employees are \$340,\$340,\$345, and \$425, what is the salary if the fifth employee?

asked by megan on March 11, 2007
36. Math C30 ( trig )

Solve : cosxtanx + root3cosx - root3/2tanx - 3/2 = 0 Give exact answers and formula for the general solution as well as the specific solutions.. Help

asked by Don on November 6, 2011
37. Algebra

please solve x+5y=10 -2x-10y=-20 Since the second equation can be obtained from the first (by multiplying both sides by -2), they are not independent and there is no unique solution. There are an infinite number of x,y combinations that are solutions.

asked by Tony on March 20, 2007
38. Chemistry

A gaseous reaction mixture contains SO2, Cl2, and SO2Cl2 in a 2 L container with the gases having the following partial pressures: P(SO2)=0.35 atm, P(SO2Cl2)=0.19 atm, P(Cl2)=0.24 atm. Kp=91 for the equilibrium system: SO2 (g) + Cl2 (g) -> SO2Cl2 (g) Is

asked by Hannah on February 18, 2007
39. maths

Driving to work alone. It is reported that 77% of workers aged 16 and over drive to work alone. Choose 8 workers at random. Find the probability that a) All drive to work alone b) More than one-half drive to work alone c) Exactly 3 drive to work alon

asked by saima on January 12, 2015
40. Chemistry

What is the boiling point of a 25.20% (m/v) KNO3 solution ? (Kf of water = 1.86 0C/molal) (Kb of water = .52 0C/molal) (molar mass potassium nitrate = 101.10324 g/mole) The density of the solution is 1.09 g/ml What is the molarity of the solution? What is

asked by Sean on March 31, 2013
41. Probability/Statistics

The teacher of a mathematics class has written up the final exam, but wants the questions to be random for each student. There are 28 students in the class, and the test has 100 questions. Each question has four possible answers. a. After reading carefully

asked by Spencer on July 20, 2015
42. math

The teacher of a mathematics class has written up the final exam, but wants the questions to be random for each student. There are 28 students in the class, and the test has 100 questions. Each question has four possible answers. a. After reading carefully

asked by lana on July 29, 2015
43. Probability/Statistics

The teacher of a mathematics class has written up the final exam, but wants the questions to be random for each student. There are 28 students in the class, and the test has 100 questions. Each question has four possible answers. a. After reading carefully

asked by Spencer on August 1, 2015
44. Algebra

What type of lines would make up a system with no solution? A) perpendicular lines B) intersecting lines C) the same line D) parallel lines

asked by idk on February 4, 2019
45. CHEMISTRY

A is a solution of trioxonitate acid of an unknown concentration, B is a standard solution of sodium hydroxide containing 4.00g per dm3 of solution 25cm3 portion of solution B require an average of 24cm3 of solution A for complete neutralization. Write a

asked by Arowolo on July 11, 2018
46. CHEMISTRY

A is a solution of trioxonitate acid of an unknown concentration, B is a standard solution of sodium hydroxide containing 4.00g per dm3 of solution 25cm3 portion of solution B require an average of 24cm3 of solution A for complete neutralization. Write a

asked by AROWOLO TEMITOPE on July 11, 2018
47. algebra

Create your own quadratic equation that has an axis of symmetry of x = −1 and whose graph opens down. Then find the vertex, domain, range, and x-intercepts. Show all work to receive full credit.

asked by Krystal on August 14, 2013
48. Physics

A bullet is ﬁred straight up from a gun with a muzzle velocity of 259 m/s. Neglecting air resistance, what will be its displacement after 8.9 s? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m. Please show work

asked by Eren on October 1, 2013
49. math

If you take the job of your dreams, your pay will be \$48 per hour. The hitch is that you will be paid in ten minute increments. If you begin work at 8:30 am, how much will you have earned by your 1:00 pm lunch break today? ( Please show me the steps.

asked by thommini on September 17, 2010
50. math

Chris works at Higgins’ Automart and is selling a new Shelby Mustang for \$59,000. If he earns a commission of 3%, how much money does he earn? Write a proportion and show all steps of your work

asked by i need help on November 12, 2018
51. algebra

find the amount of money in an account after 10 years if a principal of \$2500 is invested at 3.5% interest compounded quarterly. show work please I got 2250 but my book shows 3542.27

asked by jaimecarlon on May 10, 2015
52. math,algebra

Can someone help me with this problem I don't understand what to really do or even how to graph them I show what i have so far. Directions: Solve each of the following systems of linear inequalities graphically. Problem:

asked by jasmine20 on January 2, 2007
53. Algebra HELP!

Do not solve, show possibilities of Descartes's rule of signs for roots. 4x^3-9x^2+6x+4=0 f(x)=4x^3-9x^2+6x=4 - + + one change =4(-x)^3-9(-x)^2+6(-x)+4 - + - + three changes Positive Negative Imaginary 2 1 0 1 2 0 3 possible roots

asked by Larry on April 3, 2008
54. algebra

Can someone show me how to use the quadratic formula to solve this problem.This is for extra credit.I don't uderstand how to do this, so can someone point out the steps so I can be able to do the other five problem like this one. Thanks again for your

asked by Trina on September 4, 2010

Solve the inequality. x^3+9x^2-108 less than or equal to 0. Then write in interval noation. Please can you show me step by step on how you got the answer. I have tries and I am very confused.

asked by Paul on December 27, 2012
56. Algebra

Do not solve, show possibilities of Descartes's rule of signs for roots. 4x^3-9x^2+6x+4=0 f(x)=4x^3-9x^2+6x=4 - + + one change =4(-x)^3-9(-x)^2+6(-x)+4 - + - + three changes Positive Negative Imaginary 2 1 0 1 2 0 3 possible roots

asked by Larry on April 3, 2008
57. Algebra 2

Solve equation and show steps, explain, and i would like to thanks mrs. sue, who answered my last question, and i would like to thank in advanced whoever answers this question :)

asked by Micah on September 12, 2011
58. Algebra

Help please-I'm doing something wrong- Solve 8x^2 + 6x + 5 = 0 I'm doing square roots and all the steps but it's not working out I come up with -0.38 + 0.5 and -0.38 - 0.5 But it's not right when I go to put it back in. Could you please show the

asked by Sandra on October 6, 2010
59. Math

Is there any one who knows if I am right? Do not solve, show possibilities of Descartes's rule of signs for roots. 4x^3-9x^2+6x+4=0 f(x)=4x^3-9x^2+6x=4 - + + one change =4(-x)^3-9(-x)^2+6(-x)+4 - + - + three changes Positive Negative Imaginary 2 1 0 1 2 0

asked by Larry on April 4, 2008
60. Calculus

Solve the IVP {y'=-(sinx)y + xexp(cosx) y(0) = 1 Please show me step by step. Do I need to find out if this is exact? Do I use an integrating factor?

asked by Ella on October 7, 2009
61. Pre-Calc

I'm so stuck-this stuff is so far above me right now-Please help where do I even start? Any hint would be so helpful- (3x^3-5^2+6x-9)/(x+5) or can someone direct me to a site that can solve this and show the steps-I don't even know where to start Thank you

asked by Jonah on September 9, 2011
62. Math

7 students enter a school talent show. Prizes are awarded for the top 3 places. How many different top=three outcomes are possible? How would I solve this?

asked by Amy on October 11, 2010
63. Math

Show that if the diagonals of a quadrilateral are perpendicular, then its area is half the product of the diagonals. What kind of drawing do I do? And how doI solve this? Thank you!

asked by Samuel on November 27, 2017
64. Calc

1. The problem statement, all variables and given/known data cos(x) = -2 I was trying to solve that problem ignoring what people say about it not being defined and got a number strangely. I showed step by step so you can tell me what I did wrong as I don't

asked by Kate on July 27, 2010
65. CALC

1. The problem statement, all variables and given/known data cos(x) = -2 I was trying to solve that problem ignoring what people say about it not being defined and got a number strangely. I showed step by step so you can tell me what I did wrong as I don't

asked by Kate on July 27, 2010
66. Chem

Please tell me if these are right! 1.How many milliliters of 0.215 M NaOH solution are needed to completely neutralize 2.50 ml of 0.825 M H2SO4 solution? I got 19.2 ml 2. A 10.0-ml sample of vinegar which is an aqueous solution of acetic acid HC2G3O2

asked by Jessica on December 6, 2010
67. Pre-Calculus

Help Please Solve the following system of equations. Round your answers to the nearest tenth. Your answer will be in the form: (M,N). Find M + N, rounded to the nearest tenth. 5x+2y=7 -2x+6y=9

asked by Anonymous on September 26, 2014
68. Math

the sum of two numbers is 27. one number is 3 more than the other number. write and solve a system of equations to find the two numbers. i understand the first equation but i don't know the other one.

asked by Kevin on February 18, 2016
69. chemistry

Why do pure solvents show a level of horizontal curve as solidification occurs, but the curve for the solution sloped downward slightly? Thanks

asked by Tanimura on March 4, 2009
70. chemistry

Show calculations for how you will prepare 250 mL of 0.1 M AgNO3 solution from solid AgNO3 and water Give the reagent amounts and units.

asked by Tom on September 1, 2014
71. Tyler

Find the solution {in the interval of [0,2pi)} of: tan2x - 2cosx = 0 ( I know the answer is pi/6, but I guessed and checked. Please show the steps I need to go through in order to get the answer )

asked by Trigonometry on November 29, 2008
72. College Chemistry

What is pH of an aqueous solution formed by adding 20 mL of 0.1 mol L-1 NaOH to 30 mL of 0.2 mol L-1 HCI? Please show steps and maths. Is there a unit conversion if so how is this done. Thank you

asked by Elleni on October 22, 2010
73. PreCalc

Find the line of the equation that hits y=4x^2-20 when x= -5 that is perpendicular to 5x-6=3y My solution does not graphical show perpendicular lines, but algebraically it works lol Help!

asked by Lynnette on September 23, 2010
74. chemistry

What is the molar solubility of Sr3(AsO4)2 and the concentration of Sr^+2 and AsO4^-3 in a saturated solution at 25C? the Ksp is 1.3 E -18. Show the balanced reaction.

asked by Chloe on June 10, 2012
75. chemistry

Titration of 25.00 mL of KOH required 200.00 mL of 0.0050 M acetic acid, CH3COOH. What is the molarity (M) of the KOH solution? Please show calcutions.

asked by Toya on November 11, 2011
76. Science

To determine Kf you will need to know the total concentration of Fe3+ and SCN- present in the solution. calculate these concentration and record them in the result.(show your working for one of the example.

asked by Okafor on September 15, 2014
77. AlgebraB-2

A model rocket is launched from a roof into a large field. The path of the rocket can be modeled by the equation y = 0.04x+ 8.3x + 4.3, where x is the horizontal distance, in meters, from the starting point on the roof and y is the height, in meters, of

asked by Jennifer W. on March 26, 2013
78. Math

Theo made the table below to show the number of middle school students who attented the last football game. if this data were displayed in a circle graph, how many degrees would be in the sector representing the 8th grade Grades 6,7,8 # of students in 6th

asked by Ann on March 16, 2015
79. Research Paper

I writing a paper on teenage driving should the age be 18? I need help on my methodology page What is a methodology page? I don't know if this helps but check on google The methodology is the method you will you to solve the problem. In this case, how you

asked by Shuntay on October 14, 2006

My question only shows a picture, so I don't know much; How did Francisco Goya use caricature to depict the figures in 'Contemptuous of the Insults'? A) The facial features of the Frenchmen are exaggerated to show their confusion B) The Frenchmens' hats

asked by CyberDarkness on February 9, 2016
81. chemistry

Commercial breathalyzers contain .75 mg of K2Cr2O7, 1.5 mL of H20 and 1.5 mL of H2SO4. What is the concentraion of the dichromate in the solution?(the acid is a solvent) don't want answer just want to know how to work it out.

asked by Anonymous on February 27, 2011
82. Math

Suppose f(x) is a polynomial of degree of 5 and with leading coefficient 2009. Supposdm further that f(1) = 1, f(2) = 3, f(3) = 5, f(4) = 7, f(5) = 9. What is the value of f(6). The answer given in book is 241091. Please work the complete solution.

asked by Watson on April 23, 2013
83. chem

how much of each of the following substances would you add to water to prepare 1.20L of a .85M solution? (sodium carbonate from the pure solid) ? I am stuck on how to work this one out, too. thanks

asked by mel on November 2, 2007
84. statistics

If P=.23 and n=30 what is the outcome of P(20

asked by Amy on November 4, 2013
85. Algebra: simplifying polynomials

Please simplify the following. Please show solution if possible:) Question 1: (x^3 + x^2 - y^3 - y^2) / (x^2 - 2xy + y^2) Question 2: (u^6 + v^6 + 2u^3 • v^3) / [u^3 - v^3 + (u^2 • v) - (u • v^2)]

asked by K on October 15, 2017
86. a

For a fixed rate, a fixed principal amount, and a fixed compounding cycle, the return is an exponential function of time. Using the formula, , let r = 10%, P = 1, and n = 1 and give the coordinates (t, A) for the points where t = 0, 1, 2, 3, 4. Round your

87. Physics/Math

A force F = (4.0 N)i + cj acts on a particle as the particle goes through displacement d = (3.4 m)i - (2.0 m)j. (Other forces also act on the particle.) What is the value of c if the work done on the particle by force F is each of the following? (a) zero

asked by Technoboi11 on March 1, 2007
88. Algebra

A chemist needs to mix a solution containing 30% insecticide with a solution containg 50% insecticide to make 200L of a solution that 42% insecticide. How much of each solution should she use? dealing with- graphing, subst., and elimin.

asked by Amber on January 14, 2008
89. Chemistry

a solution is prepared using .015 L of 1.0 M HCl and .020 L of .50 M HNO3. the final volume of the solution is 1.25 L. Answer th following questions. a)what are the [H3O+] and [OH-] in the final solution? b)What is the pH of the final solution?

asked by Alexa on May 4, 2010
90. chemistry

Acetic acid, CH3CO2H, is the active ingredient in vinegar. It's often abbreviated "HOAc". Vinegar is acidic because acetic acid makes H3O+ when it partially ionizes in water: HOAc(aq) + H2O H3O+(aq) + OAc–(aq) Suppose that you have a solution of

asked by hannah on March 19, 2013
91. Physics

how do you solve this a single water particle in a fountain travels through an 85 m system and then returns to the same point. what is the displacement of this water particle during one cycle? how do you get the answer ZERO?

asked by y912f on January 31, 2009
92. math

i don't understand what to do.if someone can tell me what to do i can try to get the answer. solve each system by graphing.identify systems with no solutions and systems with infinitely many solutions, using set notation

asked by alexh on September 8, 2009
93. algebra

suppose you want to add a sprinkler system, and location of one section of the ssprinker line can be described by the equation y=1/2x-4 complete the table for this equation x y (x,y) -1 -2 -4 2 8 PLEASE HELP ME SOLVE THIS TABLE!!!!!!

asked by pj on October 24, 2008
94. Technology~bobpursley

25. Briefly explain the difference between product design and system design. 25. There are a few differences between system design and product design. System design deals with the arrangement of components to produce a desired result. For example,

asked by y912f on April 7, 2010
95. Math

Solve the following linear programming problems by the graphical method Dr. Lum teaches part-time at two different community colleges, Hilltop College and Serra College. Dr. Lum can teach up to 5 classes per semester. For every class taught by him at

asked by Travis on February 4, 2016
96. Math

Check my answers please. 1. What is the solution to 5 + t = 23 a. 28 b. 18 ** c.-18 d.-23 2. What is the value of b if -7 + b = -8 a. b = 15 b. b = 1 ** c. b = -1 d. b = -15 3. What is the solution to 5q = -75 a. q = -25 b. q = -15 c. q = 15 ** d. q = 25

asked by Briona on September 2, 2015

is anyone can help me to get the correct answers for the questions below.please help me thank you 1.How effectively your staff communicates and relates to each other can tell you how much they care for their work and the people around them? my answrs: To

asked by jessie on September 29, 2011
98. college algebra

Can someone please help me find the x-intercepts and y-intecepts of this equation. I have the radius, and center but I can't seem to get the intercepts. x^2+y^2=16x-18y+145=25 Please show work. Thanks!!

asked by confused on December 4, 2012
99. math

Not quite sure how to do this question What is the simple interest on a \$14,500 loan at 9% interest for 5 years any help would be great thanks I have to show all of my work I just need to be pointed in the right direction thanks

asked by Dameion on March 10, 2008
100. chemistry

(a) Calculate the molar mass of the unknown compound. The freezing point of benzene is 5.48°C, and the Kf of benzene is 5.12 °C/Molal. Show your work

asked by Helen on November 14, 2012