# 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 60
1. ## science(chem) Dr.Bob-> need help on this long lab

For 1 part of the lab I: prepare 4-Bromo-2-chloro-6-iodoaniline I dissolve 250mg recrystallized 4- Bromo-2-chloro-6-iodoaniline in 4ml of glacial acetic acid in 25ml erlenmyer flask and add 1ml water to the mixture. Then I prepare a solution of 250mg

asked by ~christina~ on March 11, 2008
2. ## Algebra

Simplify the expression -5+i/2i I typed this problem into mathway and they told me the answer was 1/2+5i/2 but wouldn’t show me how they got it. They said to (“multiply by the conjugate and simplify”) but I have no clue on what the conjugate is and

asked by Samantha on October 18, 2017
3. ## finance

14. Assume Julian has a choice between two deposit accounts. Account A has an annual percentage rate of 7.55 percent but with interest compounded monthly. Account B has an annual percentage rate of 7.45 percent with interest compounded continuously. Which

asked by Vaness on December 30, 2011
4. ## Mathematics

use rolle's theorem to show that the equation 7x^6-9x^2+2=0 has at least one solution in the interval (0,1)

asked by Anonymous on February 22, 2015
5. ## math

How do I draw a diagram to show how to find the solution to 2.6 divided by 0.4

asked by Buggy boo on September 10, 2013
6. ## math

Let U={u,n,i,t,e} A={n,i,t} B={n,e} C={u,n,i,t,e} D={u,e} Find each of the following: (a)A(with upside down horseshoe)B (b)C U D (c)D (with line over the D) show solution

asked by Anonymous on September 24, 2010
7. ## calculus plz help me

integrate:dx/((x-1)sqrt(x^2-2) plz show solution i plead

asked by samuel on May 5, 2016
8. ## algebra

can you please show me how to do this? Determine whether the ordered pair is a solution of the inequality. y>x^2- 5x (2,-3)

asked by Tyriq on August 25, 2010
9. ## chemistry

A solution of potassium chloride has a pH of 7.81.What is the [OH-] in mol/L ? Can you please show steps I would appreciate it very much. Thank you

asked by Amber on May 25, 2008
10. ## Math

How much is \$20,000 compounded annually at 6% for 35 years? Thank you. Please show solution

asked by Leah on August 2, 2013
11. ## Physic

Show that the function y(x,t) = X^2 + V^2t^2 is a solution of the general wave equation.

asked by Godwin on January 4, 2016
12. ## Physics

Show that the function y(x,t) = X^2+V^2t^2 is a solution of the general wave equation.

asked by Godwin on January 4, 2016
13. ## mathematics need help me

evaluate the limit of [1/(n+1)+1/(n+2)+....+1/(n+n) as n tends to infinity plzzzzzzzzzzzzz show me solution

asked by dam on September 26, 2016
14. ## math

what is the 7th term of the geometric sequence 10,2.2/5,2/25 (show your solution)

asked by eljone on August 16, 2016
15. ## Math

Determine the number of factors of 5^x + 2•5^x+1. Choices: A) x B) x + 1 C) 2x D) 2x + 2 Please show solution:)

asked by K on October 3, 2017
16. ## CHEMISTRY!!!=0

Determine the pH of each solution: (a) 0.10 M NH4Cl can someone show me how to do this one so i have the idea of how to do the rest. thanks!

asked by ALISON on March 1, 2012
17. ## math

i need to draw a diagram to show the solution to 2.6/0.4. and explain what the quotient mean?

asked by dezy on March 13, 2014
18. ## Math

Determine the number of factors of 5^x + 2•5^x+1. Choices: A) x B) x + 1 C) 2x D) 2x + 2 Please show solution:)

asked by K on October 3, 2017
19. ## help me damon reiny steve bob plzz

prove that nsini=constant plz show me solution

asked by dam on September 26, 2016
20. ## Algebra

2 questions I need some help with please! 1. Find the partial sum S5. an= -2n+16 2.Solve the system by triangularizing the augmented matrix and using bakc substitution. 7x=y-6 3y= -5-2x

asked by Kris on April 17, 2013
21. ## math

Use a matrix equation to solve the system of equations. 6x + 2y = 11 3x - 8y =1 My textbook gave this example, but explained it in a really weird way and I don't understand how to do it. Can someone help?

asked by Charly on December 21, 2018
22. ## college alegebra

solve the following equation in the real number system 3x^3 - 20x^2 + 29x +12 = 0 Ok I thought I knew how to do this but I guess I don't. Help me! Please!

asked by anon on December 8, 2011
23. ## maths

Write the system as a matrix equation and solve using inverses. x1 + 2x2 - x3 = -3 -2x1 - x2 + 3x3 = 0 -4x1 + 4x2 - x3 = -12 A. x1 = 2, x2 = -3, x3 = 1 B. x1 = 1, x2 = -2, x3 = 1 C. x1 = 1, x2 = -2, x3 = 0 D. x1 = 1, x2 = -3, x3 = 1

asked by mdan on October 15, 2013
24. ## math

Solve the system of equations below by graphing. mc009-1.jpg What are the approximate solutions rounded to the nearest tenth?

asked by Antonio on May 2, 2018
25. ## Math

Arectangle has perimeter 64cm and area 23cmsquared. Solve the following system of equations to find the rectangle's dimensions.

asked by Ariza on October 24, 2009
26. ## Math 8th Grade

I have a bunch of nickels and quarters worth \$7.85 in my [pocket. How do I write a system of equation to solve and determine how many of each coin I have!!

asked by Blakey on June 12, 2013
27. ## chemistry help DR. BOB

When 27.20mL of .5 M H2SO4 is added to 27.20 of 1M KOH in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C. Calculate delta H of this reaction. (Assume that the total volume is the sum of the individual volumes and that density

asked by patrick on October 16, 2015
28. ## chemistry/check my work I have to submit today

When 27.20mL of .5 M H2SO4 is added to 27.20 of 1M KOH in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C. Calculate delta H of this reaction. (Assume that the total volume is the sum of the individual volumes and that density

asked by patrick on October 16, 2015
29. ## algebra

1.)If the airline charges \$320 per passenger, find the profit made by the airline for flying 10,000 passengers from New York to Atlanta. Use the equation editor to show all work. Write a sentence to explain your answer. Remember: Profit = Revenue - Cost

asked by brandon b on August 10, 2016
30. ## Chemistry

Can u help me in balancing the following eqn. through oxidation no. method or half reaction method. Also please show and explain the steps. HNO3(aq.) + KI(aq.) -----> NO(g) + I2(s)+ H2O(l) + KNO3(aq.) Hoping for a quicker response. I goes from -1 to 0 N

asked by Niraj on July 9, 2007
31. ## algebra

solve y - 3 > - 13 the solution is {x|x > ?} A: {x|x > -10}

asked by Carmen on October 4, 2008
32. ## math

How do I solve x^2+2x+4>0 and what does the solution tell you?

asked by Anonymous on November 16, 2014
33. ## Math Help

Help Solve x^2+2x-4=0 What is the solution

asked by katie A on October 18, 2011
34. ## Algebra

How do I solve -22

asked by A.W. on March 22, 2009
35. ## Mat 116

Solve for m p=4m+4v the solution is m=

asked by Carey on August 27, 2011
36. ## Math 116 algebra please check

Solve 8x - (5x + 7)= 17 The solution is x= 8

asked by jay jay on July 16, 2008
37. ## Algebra 2

When you solve t(t+1)(t-2)=0, is the solution {0, -1, -2}?

asked by Danny123 on September 28, 2010
38. ## algebra

Solve. 8/w = 9/w - 1/2 The solution is:

asked by becky on February 12, 2008
39. ## algebra ll

Solve for f. (f - 12)2 = 25 A. f = 5 or f = −5 B. f = 12 or f = −12 C. f = 17 or f = 7 D. no solution

asked by leo on June 25, 2012
40. ## Algebra

Solve. -0.1x < -4. The solution is { x| }.

asked by A.W. on March 22, 2009
41. ## Algebra

How do I solve for y when z= 6-y, for y.The solution is y=?

asked by A.W. on February 1, 2009
42. ## Math 116 algebra please check

Solve -0.8x < -56 The solution is x

asked by jay jay on July 16, 2008
43. ## 9th

Solve for: -20

asked by Kimmie on March 10, 2010
44. ## math

Solve -0.6x < -24 x=-40 the solution is {x|

asked by DD on July 21, 2009
45. ## Math Help

Help Solve x^2+2x-4=0 What is the solution

asked by katie A on October 18, 2011
46. ## algebra

solve 8x -(5x +4)= 5 The solution is x= 8 is this right

asked by algebra yuck on September 12, 2009
47. ## Algebra

Solve 4(2x-3) < 3x+6 Would the solution be x > 18/5?

asked by Anonymous on October 13, 2009
48. ## Algebra 2 Answer Check

Solve. 2x + 4(x + 1) = 6(x + 2/3) A: No solution.

asked by Victoria on September 21, 2014
49. ## Math 116 algebra please check

Solve 5/2x + 1/4x = 9/4 + x The solution is x 9/10

asked by jay jay on July 16, 2008
50. ## algebra

Mike would like to plant some trees so he needs to use a portion of his existing yard. The perimeter of this rectangular portion needs to be 14 yards and the diagonal is 5 yards. Can you help Mike determine the length and width of this new portion? Mike

asked by ella on January 16, 2011
51. ## random

what kind of website is this? what is jiskha? Jiskha is the name given to the site by the man who runs the show here. His name is Leo. This is a help site with the emphasis on help. We try to help students do their homework. But we like to see what the

asked by cc on January 18, 2007
52. ## Chemistry

I am confused about why this is the answer to a practice problem I was given. (answer is c). Could someone explain why/why not for each answer? 2) Solution A is made from 1 L of water and 0.1 moles of Na(CH3COO), and Solution B is made from 1 L of water

asked by Trixie on March 7, 2010
53. ## Math

Find unit rate! I know the answer but how am I suppose show my work to show that it is a unit rate? Question: Five buses leave on a field trip. There are about 45 students per bus. About how many students are on the 5 buses?

asked by Trinity on January 22, 2010
54. ## Chemistry

What is the change in internal energy (in J) of a system that absorbs 0.677 kJ of heat from its surroundings and has 0.438 kcal of work done on it?

asked by Ashley on October 19, 2010
55. ## Chemistry

What is the change in internal energy (in J) of a system that absorbs 0.677 kJ of heat from its surroundings and has 0.438 kcal of work done on it?

asked by Nevaeh on October 22, 2010
56. ## Math

How does the thing for metric system, "King Hector Drinks Units of Delicious Milk" work? What does it stand for?

asked by Angie on March 9, 2009
57. ## Chemistry

What is the change in internal energy (in J) of a system that absorbs 0.677 kJ of heat from its surroundings and has 0.438 kcal of work done on it?

asked by Ashley on October 20, 2010
58. ## chemistry

Calculate the change in internal energy for a system that absorbs 242 J of heat and does 193 J of work on the surroundings...

asked by kellie on October 24, 2010
59. ## CHEMISTRY> HELP QUICK! pls

A system loses 14.2 kJ of heat while performing 7.2kJ of work on the surroundings. If the initial internal energy, E, is 77.6 kJ, what is the final value of E? 56.2 kJ 70.6 kJ 99.0 kJ 84.6 kJ

asked by Lucinda on August 20, 2010
60. ## college algebra

solve the following logarithmic equation. 1. 2log(lower2) (x-2) + log(lower2)^2=3 I do not know how to make the 2 by the g on my computer. 2. log(lower729^x) + log(lower27^x) + log(lower3^x) =9 again I do not know how to make the numbers lower case please

asked by confused--two questions please help on November 30, 2012
61. ## math

Delta airline flights seats 340 people. An average of 5% of the people with reservations doesnt show up, so they overbook by 350. This system can be analyzed by using binomial distribution. n=350 and p=0.95 1) Find the probablity that 350 reservations

asked by mel on April 6, 2008
62. ## math 117

Quadratic equations may be solved by graphing, using the quadratic formula, completing the square, and factoring. What are the pros and cons of each of these methods? When might each method be most appropriate? Which method do you prefer? Explain why.

asked by Anonymous on December 5, 2011
63. ## Chemistry (URGENT)

T=thickness, V=volume, A=area, m=mass D=density V=m/D Suppose T=V/A is a method used to find the thickness. How may this method be used in finding the size of molecules.? I really need help. Been thinking about it for awhile. Thanks in advance.

asked by John on November 23, 2010
64. ## algebra problem that is causing me headaches

I have no real method for this problem other than trail and error and foil. I have come up with some amny variations until I am on my second sheet of paper! The closet I have gotten to factoring/solving this problem so far is.... #46.) -3t^3+3t^2-6t

asked by Shawn H. on September 20, 2007
65. ## Calculus (Please check my work!)

Suppose that y = f(x) = x^2 - 4x + 4. Then on any interval where the inverse function y = f-1(x) exists, thederivative of y = f-1(x) with respect to x is: (Hint: x^2 - 4x + 4 can be factored and rewritten as "something" squared.) Work thus far: Okay, so I

asked by Anonymous on March 15, 2012
66. ## physics

A camper kayaks 16km east from a camoing site, stops, and then paddles 23km west. What is the camper's final position with respect to the campsite? I need to solve this problem using the GRASS method. pls help me.

asked by ted on September 26, 2011
67. ## simplex method

Maximize P=60x+50y. ⎧ ⎪x+y≤80 ⎪ ⎪5x+10y≤560 ⎪ ⎪50x+20y≤1600 ⎪ ⎪x≥0 ⎨ ⎪y≥0 ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎩ Use the simplex method to solve the problem. Use s, t, and u as your slack variables for the first, second, and third

asked by Anonymous on November 23, 2016
68. ## Math

Solve for x: 5/x+6+2/x^2+7x+6=3/x+1 5/x+5+2/(x+6)(x+1)=3/x+1 5(x+6)(x+1)/x+6+2(x+6)(x+1)/(x+6)(x1)=3(x+6)(x+1)/x+1 5(x+1)+2=3(x+6) 5x+5+2=3x+18 5x+7=3x+18 2x=11 x=11/2 or 5 1/2 is my method correct? and I need assitance checking my answer. Thanks for your

asked by Dragonfly on July 24, 2007
69. ## 9th grade algebra

Can you explain how to find the solutions to the following system of equation problems? Graph f(x) and g(x) to find the solution to the equation f(x) = g(x). Approximate the answer when necessary. 1. f(x) = -2/3x +4 and g(x)= x - 6 Ans: Step1 graph lines.

asked by Alexis on September 7, 2016
70. ## Social Studies

1. TO which system of governemt is the feral system most similar? A. the unitary system, ecause both place most powers with legislature B. the conferal system, because both spilt powers among the state and national governemnts C. the unitary system,

asked by HELPPP on September 30, 2015
71. ## algebra

Solve system of equations to model the problem then solve: The length of a rectangle is 7 inches more than the width. The perimeter is 34 inches. Find the length and the width of the rectangle.

asked by Brianna on November 26, 2014
72. ## algebra

Solve system of equations to model the problem then solve: The length of a rectangle is 7 inches more than the width. The perimeter is 34 inches. Find the length and the width of the rectangle.

asked by Brianna on November 27, 2014
73. ## business

The table given below provides the shipping costs and supply available at each source. Find the minimum-cost shipping solution for the transportation problem. Provide a table of shipping quantities and the minimum value for the objective function for the

asked by Anonymous on July 24, 2010
74. ## Maths

How many trees can be planted in an area of 90000 sq feet if vertically 8 feet distance and horizontally 3 feet distance is to be kept? Pl show the method of calculations.

asked by J on May 22, 2012
75. ## A few chemistry

I got the rest of the homework, but these are confusing me so much...ugghhhh. 1. The pH of a .400 M solution of iodic acid, HlO3, is .726 at 25 degrees C. What is the Ka(acid constant) at this temperature? 2. The pH of a .150 M solution of HClO is found to

asked by Trish on March 22, 2007
76. ## chemistry

I have two that I can not figure out: #1: calculate the MOLALITY of 10.00 g/L of the salt, if its molar mass is 100.0 g/mol and solution density D=1.100 g/mL work: 10.00 g NaCl x (1mL/1.100g) x (1kg/1000 mL)= 0.00909 kg 100.0 g x (1 mol NaCl/58.4 g Nacl)=

asked by sam on November 21, 2015
77. ## Pre-algebra

Hi need help answering this question? In your own words, define the term equation and then explain what it means to solve an equation. Give an example of an equation and its solution. Explain why it is the solution.

asked by clarissa on May 21, 2011
78. ## MATH

20. A certain computer can perform 105 calculations per second. How many calculations can it perform in 10 seconds 21. Write the steps to solve the following problem. Explain your steps as you solve it. What are the steps to show the quotient in simplest

asked by SK8TER H8TER on September 18, 2012
79. ## Biology

What are the levels of organization in a living system? LEVEL 1 - Cells Are the basic unit of structure and function in living things. May serve a specific function within the organism Examples- blood cells, nerve cells, bone cells, etc. LEVEL 2 - Tissues

asked by jayjay on August 8, 2007
80. ## AP Chemistry

An unknown compound contains only the three elements C,H, and O. A pure sample of the compound is analyzed and found to be 65.60 percent C and 9.44 percent H by mass. a.)Determine the empirical formula of the compound. b.)A solution of 1.570 grams of the

asked by some kid on January 5, 2009
81. ## Algebra II

1)What method(s) would you choose to solve the equation: x2 + 2x - 6 = 0 A. Square roots; there is no x-term. B. Quadratic formula, graphing; the equation cannot be factored easily since the numbers are large. C. Factoring; the equation is easily factored.

asked by Hally on January 15, 2013
82. ## MATH

Which method of solving quadratic equations should be used when only an estimated solution is necessary? factoring quadratic formula graphing MY GUESS GRAPHING?

asked by Meredith Grey on February 26, 2015
83. ## calculus

Use Euler's method with step size .2 to estimate y(.4), where y(x) is the solution of the initial value problem y=x+y^2, y=0. Repeat part a with step size .1

asked by Bryan on November 10, 2013
84. ## Really need help in Calculus Problem?!

Use Euler's method with step size .2 to estimate y(.4), where y(x) is the solution of the initial value problem y=x+y^2, y=0. Repeat part a with step size .1

asked by Bryan on November 10, 2013
85. ## science

1.Which level of organization does the complete skeleton of a mouse belong to? A.cell B. a tissue C.an organ D.an organ system 2. The structures that an animal uses to exchange gases with its surroundings make up the... A. digestive system B. respiratory

asked by finessky on November 20, 2018
86. ## chemistry

Help with Beer's Law lab experiment question! So we were told to calculate the concentration of 5 standard solutions but I don't know how to do that exactly. The Concentration of the solution in flask B was .0024 M and our lambda max (max absorption) was

asked by Anonymous on September 6, 2010
87. ## Help w/this one again(Math!!)

Write one or two equations to represent the situation below. Solve the equation(s). Show all your work. Two cars leave town going in opposite directions. The car heading north travels at 55 mph. The car heading south travels at 75 mph. How long will it

asked by Danny on November 7, 2006
88. ## Chemistry

Glycine amide hydrochloride (BH+) FM 110.54, pKa 8.20 Glycine amide (B) FM 74.08 b.) How many grams of glycine amide should be added to 1g of glycine amide hydrochloride to give 100ml of solution with pH 8? I tried using the henderson-hasselbalch equation

asked by Ken on October 30, 2011
89. ## Math check my answers

1. Evaluate. 8d - 10 for d = 4 A.32 B.22*** C.26 D.46 2. write an algebraic expression for the sum of 3 coins and c coins. A.c + 3*** B.c/3 C.3c D.c-3 3. Find the solution of the equation from the given numbers. x - 2 =16: 14, 18, 21, or 12 A.12 B.14

asked by Sid.V on December 1, 2016
90. ## Physics

A 1000 kg car is moving at a constant speed of 7 m/s when it hits the back bumper of another car with 1200 kg of mass moving in the same direction at a constant speed of 6 m/s. As a result of the collision both bumpers get coupled. Show all work and

asked by Will on January 6, 2012
91. ## Pre-Calc with Analytic Geometry

Function : y=cot(2x+pi) 1)determine the interval for the principal cycle. (Type this answer in interval notation) 2)Then for the principal​ cycle, determine the equations of the vertical​ asymptotes. 3)find the coordinates of the center​ point. 4)

asked by Nancy on August 4, 2016
92. ## chemistry

1)A solution has a [OH-] of 5.2 x 10-4. What is the [H3O+] in the solution? 2) A 0.25 M solution of a monoprotic acid, HA, has a pH of 2.54. What is Ka for this acid? The dissociation of HA is: HA + H2O H3O+ + A- (Hint: write the expression for pH) 3 A

asked by nicki on December 9, 2012
93. ## math

consider the curve defined by the equation y=a(x^2)+bx+c. Take a point(h,k) on the curve. use Wallis's method of tangents to show that the slope of the line tangent to this curve at the point(h,k) will be m= 2ah+b. have to prove this for tow cases: a>0 and

asked by iew on May 21, 2007
94. ## calculus help

At time t=0, an astronaut stands on a platform 3 meters above the moon's surface and throws a rock directly upward with an initial velocity of 32 m/sec. if the acceleration due to gravity is 1.6 m/sec^2. a) find the equations of motion for the throwing of

asked by Anonymous on April 25, 2014
95. ## English

I need help annotating please help me In the recent years, the media has shared with the public two very different stories involving children who committed acts of violence. Both minors were charged with murder and sent to adult state prison to serve their

asked by Amy on October 18, 2014
96. ## LAW

1. The right to a grand jury can be found in which Constitutional amendment? A. Fourth B. Fifth C. Sixth D. Fourteenth is it B 2. Which of the following is a method of pretrial release where the defendant promises to show up when required, without having

asked by Amy on January 7, 2014
97. ## math

I need someone to review this and see if it is correct please 1. Suppose you are in the market for a new home and are interested in a new housing community under construction in a different city. a) The sales representative informs you that there are two

asked by jason on June 27, 2009
98. ## Social Studies

Why was Henry Ford able to produce an affordable car? A. He only hired immigrants who would work for low pay. B. He used cheap parts made overseas. C. He developed a less expensive method of production. D. He allowed people to purchase new cars on credit.

asked by Me on March 1, 2018
99. ## Social Studies

Why was Henry Ford able to produce an affordable car? A. He only hired immigrants who would work for low pay. B. He used cheap parts made overseas. C. He developed a less expensive method of production. D. He allowed people to purchase new cars on credit.

asked by Annonomus, on March 1, 2018
100. ## chem

Consider the equation A in a 1L container. At 7.57C, the molar concentrations of A and B are 7.228M and 1.976 (respectively). Suddenly, 1.831 moles of A are added to the system. What is the change in deltaG of the system (Answer in kJ) At first, I thought

asked by Marisol on April 1, 2007