# 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 216
1. ## physics

A technician needs to determine the amount of energy required to increase the temp. of a vat containing 12 kg of water. The water enters the vat from the water mains at a temp. of 15 deg C. The technician knows that the final temp. required is 90 deg C.

asked by Huliney on April 8, 2014
2. ## College Finite Math

Suppose for this problem that Pr[E]=13/24 and Pr[F]=5/8 and Pr[(E U F)'] = 0. Finding Pr[E/F] and Pr[F/E]. For this problem I added 13/24 + 5/8 and got 1.17, therefore, I assumed that .17 is the intersection between Pr(E) and Pr(F). I know that to solve

asked by Rory on March 16, 2009
3. ## Algebra

A.Write and solve an equation to find three consecutive integers with a sum of 126. Let n= the first integer. B. In part A, could you solve the problem by letting n= the middle integer,n-1= the smallest integer, and n+1= the largest integer?

asked by Brianna on October 13, 2011
4. ## math

The measures of two supplementary angles are in the ratio 5:1. What is the measure of the smaller triangle? A/B = 5 A + B = 180 Solve those 2 equations in two unknowns. B is the smaller angle. Hint: substitute 5B for A in the second equation. Then only B

asked by Peggy on February 23, 2007
5. ## Algebra

A.Write and solve an equation to find three consecutive integers with a sum of 126. Let n= the first integer. B. In part A, could you solve the problem by letting n= the middle integer,n-1= the smallest integer, and n+1= the largest integer?

asked by Brianna on October 13, 2011
6. ## Pre Cal.

So I posted these...but no one answered them. Are they right? Solve 4sin^2 x + 4sqrt(2) cos x-6 = 0 for all real values of x. My answer: (pi/4)+2(pi)k, (7pi/4) + 2(pi)k Solve 2cos^2 x-5cosx+2=0 for principal values of x. My answer: 60 and 300 degrees

asked by Jason on April 29, 2009
7. ## Functions - more info

Sorry, I forgot to enter all the info before. Below is the updated info for the problem. What's the best way to solve functions? I can do basic ones, but have trouble with the harder ones. I'm having trouble with the following: Inputs x 1, 2, 3, 4, 5

asked by Shelby on May 22, 2012
8. ## algebra

Solve by setting up the proper equation to describe the facts given and then carrying out the mathematical calculations to solve for the unknown variable(s). The sum of two numbers is 36. Their difference is 4. Determine the two unknown numbers.

asked by keith on July 7, 2012
9. ## Algebra

15. A boat travels 30 miles upstream in 4 hours. The trip downstream takes 2.5 hours. Find the rate of the boat in still water. 33. Solve the following: (q + 2)^2 = 25 34. Solve the following: y^2 + 6y + 9 =49 39. How many real roots are there for the

asked by mysterychicken on June 13, 2010
10. ## half-life

If 250mg of a radioactive element decays to 200mg in 48 hours, find the half-life of the element. ln(No/N) = kt No=250 mg N = 200 mg t = 48 hours. Solve for k, then put k into the following equation and solve for t1/2. k = 0.693/t1/2

asked by Jen on February 16, 2007
11. ## Physics

Person sits on a frictionless stool that is free to try ate but is initially at rest. The person is holding a bicycle wheel (I = 3 kg*m2) that is rotating at 8 Ree/s in a clockwise direction as viewed from above, and the moment of inertia of the

asked by Lester on October 30, 2016
12. ## chem

i had posted this question about a week ago and had gotten help from bobpursley(thank you so much btw) but i was showed how to do it using an equationa and now when im studying for the test i realize i need to be able to make a conversion factor to solve

asked by hannah on November 15, 2010
13. ## algebra

You are given to equations which are both true, and you are asked to solve for both x and y. you plan o 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 on y’s. the

asked by Anonymous on December 29, 2009
14. ## Algebra 2

1.) Solve for x. 2x(x - 12) = -40 2.) Solve for x. 3x2 + 2x = 12 - 7x 3.) Simplify the expression. 8sqrt[-63] 4.) Find the absolute value of the complex number. Abs Val [7 + 24i] 5.) Simplify the expression. [4 - 7i] + [2 + 3i] Thank you so much!! :)

asked by Chloe on February 28, 2014
15. ## Algebra 2 Help

1.) Solve for x. 2x(x - 12) = -40 2.) Solve for x. 3x2 + 2x = 12 - 7x 3.) Simplify the expression. 8sqrt[-63] 4.) Find the absolute value of the complex number. Abs Val [7 + 24i] 5.) Simplify the expression. [4 - 7i] + [2 + 3i] Thank you so much!! :)

asked by Chloe on February 28, 2014
16. ## calculus

We are not going to do that work for you, but will be glad to help you. The unit sphere is the sphere with radius 1 centered in the origin. They give you the coordinates of a vector. Compute the dot product of the vector and the local surface area normal

asked by drwls on August 5, 2007
17. ## math

Consider yourself a genetic counselor. Megan and Eric come to you for your services. They are planning on having their first child. Megan’s father died from Huntington’s disease. Eric’s family has no history of Huntington’s disease. They would like

asked by Olivia on November 26, 2007
18. ## calc

standard equations of circles that have centers on line 5x-2y=-21 and are tangent to both axis. Any ideas?? First express the line as in point slope form y=(5/2)x - 21/2 The center must be on the line, so it is a point expressed as (x,(5/2)x - 21/2) In

asked by Melba on September 26, 2006
19. ## Calculus

R=M^2(c/2-m/3) dR/dM=CM-M^2 I found the derivative. Now how would I find the vale of M that maximize the derivative dR/dM? set it to zero, and solve for m. You get two solutions. Use the second derivative to see which one is the max. I get M=C. How do I go

asked by Anonymous on May 29, 2007
20. ## physical science

A horizontal force of 100 N is required to push a box across the floor at a constant velocity. a) Show that the net force acting on the box is zero. b) Show that the friction force that acts on the box is 100 N.

asked by sky on February 9, 2014
21. ## Trigonometic

Solving Trigonometic Equations solve for x and give the answers as a equations : ( by radian) 1)cos(sinx)=1 We know sin 2x = 2(sinx)(cosx) so (sinx)(cos)=1/2(sin 2x) So we can change your equation from (sinx)(cosx)=1 to 1/2(sin 2x) = 1 (sin 2x) = 2 But the

asked by abdo on April 26, 2007
22. ## Math

I want to order a pizza with 3/4 slices of the slices having bacon topping, 5/8 with mushrooom and 4/16 with pepperoni. How many slices can have all three toppings, given that every slice must have at least one topping? I said no slice could have all

asked by Antonina on December 5, 2015
23. ## math...

Julia is allowed to watch no more than 5 hours of television a week. So far this week, she has watched 1.5 hours. Write and solve an inequality to show how many hours of television Julia can still watch this week. I did. 5÷1.5=3.33 T=time T

asked by Anonymous on September 25, 2014
24. ## MATHS

A and B take 18 days to complete a work. A left the work after 10 days and B takes 12 days more to complete the work. In how many days can A complete the whole work?

asked by clive on December 31, 2015
25. ## language arts

in "all together now" , Barbara jordan's main purpose is to A) persuade readers that a tolerant society is best created by working on a small scale . B) inform readers of the recent history of the civil rights movement in the united states. C) praise the

asked by help please on November 1, 2016
26. ## Biology

10. The mouth, small intestine, and kidneys have functions that involve the a. digestion of food, synthesis of vitamins, and filtering of the blood b. intake, digestion, absorption, and elimination of food and wastes c. secretion of bile, digestion of

asked by mysterychicken on March 19, 2010
27. ## algebra

Yesterday Lucy walked 2 hours and jogged 1/2 hour and covered 6.25 miles. Today she walked for 3 hours and jogged for 1 hour and covered 10.25 miles. Assuming a constant walking rate and a constant jogging rate, how fast did she walk and how fast did she

asked by jordan on October 15, 2009
28. ## Human Resources

3. Design a Pilot Test. Following are descriptions of three situations in which a test has been developed. Read each situation and then design a pilot test. Answer the following questions about the pilot test: a. Who will take the test? b. What information

asked by Anonymous on August 5, 2014
29. ## Math

Define variables and write a system of equations for this situation. Solve using substitution. Suppose you want to join a video store. Big Video offers a special discount card that costs \$9.99 for one year. With the discount card, each video rental costs

asked by Angie on April 1, 2009
30. ## APC Chemistry

Please correct me if any wrong info is given Volume(cm3)Area (cm2)Thickness (cm) .20 cm3 100 cm2 0.02 cm .28 cm3 122 cm2 0.002 cm .24 cm3 144 cm2 0.016 cm .41 cm3 225 cm2 0.0182 cm If you had used a very crude balance that allowed only one significant

asked by Anonymous on October 6, 2010
31. ## English

1. Do first things first. 2. Do the first things first. (Which one is right?) 3. What kinds of health problems does the people in the pictures have? Look at the person in Picture One. He is holding a measuring tape. Doesn't he look heavy? He needs to be on

asked by John on September 1, 2009
32. ## chemistry

A 100.0 mL sample of 0.300 M Ca(OH)2 is mixed with 100.0 mL of 0.700 M H3PO4 in a coffee cup calorimeter.If both solutions were initially at 35.0 °C and the resulting solution had a temperature that was recorded at 39. 7°C, determine the ΔHrxn in units

asked by jenna on April 25, 2016
33. ## Business

Read the case study below “Hi-Ho Yo-Yo, Inc.”. Write a short summary of each of the four methods for selecting the order in which to release the products to printing. Complete a short analysis for each method which provides the average flow time and

asked by Kiva on December 17, 2011
34. ## Chemistry

#16 A gas occupies 7 L at 71.8 kPa & 30°C. Find its volume at 273K and 101.325 kPa. Show your work using the combined gas law. #17 In the winter, bodies of water tend to not freeze solid. This allows fish and other aquatic life to survive below the

asked by Vance on April 7, 2019
35. ## physics

2. You push a 2.0 Kg block against a horizontal spring (the spring constant is k=200 N/m) compressing it by 15 cm. Then you release the block and the spring sends it sliding across a tabletop. The block stops 75 cm from where you released it. (a) Find the

asked by Anonymous on December 1, 2014
36. ## Algebra

Use a system of equations to solve the following problem. The local theater has three types of seats for Broadway plays: main floor, balcony, and mezzanine. Main floor tickets are \$59, balcony tickets are \$50, and mezzanine tickets are \$40. One particular

asked by diane on February 23, 2016
37. ## Algebra Zero Product Rule

I'm working with the zero product rule and I've somehow lost my way on a certain problem pattern. (x+8)(x-3)= -30 Is the pattern and the answer in the book says -2 or -3, but when I do the problem... x²+5x-24= -30 x²+5x+6= 0 (x+6)(x-1) x= -6 x= 1 That is

asked by Jake on September 2, 2006
38. ## physics

(1a). The gravitational field strength g on the earth’s surface is 9.8N/kg. explain what this means.(b) Using the law of gravity, show that gr2= k. Where g=gravitational field strength at a distance r from the center of the earth (r>Re), where Re is the

asked by collins on January 8, 2016
39. ## physics

(1a). The gravitational field strength g on the earth’s surface is 9.8N/kg. explain what this means.(b) Using the law of gravity, show that gr2= k. Where g=gravitational field strength at a distance r from the center of the earth (r>Re), where Re is the

asked by Anonymous on January 8, 2016
40. ## math

\$800 worth of tickets were sold.adult price is \$6.children is \$3 and seniors \$2. 90 adult purchase ticket,60 children purchase tickets.how many tickets were purchase at senior price and how would you write an equation and solve to find the solution? how do

asked by sandy on January 23, 2013
41. ## Chemistry

So the Ksp for silver chloride is 1.8*10^-10, how could I find the concentration of silver ions in this saturated solution. Then how I find the total ion concentration? AgCl ==> Ag^+ + Cl^- Let AgCl solubility is x. Then (Ag^+) is x and (Cl^-) is x Ksp =

asked by L on May 17, 2007
42. ## chemistry

I have 3 questions I need help with 1. mix 120ml of 0.320M silver nitrate with 40ml of 0.320M potasium chromate. What mass of silver chromate is produced? 2. Calculate the mass of white solid CaCO3 that forms when 98ml of a 0.1M Ca(NO3)2 solution is mixed

asked by Krissy on January 27, 2010
43. ## Economics305

As a manager of a financial planning business you have two financial planners, Phil and Francis. In an hour, Phil can produce either one financial statement or answer 8 phone calls, while Francis can either produce 4 financial statements or answer 10 phone

asked by Mizzy Kay on February 8, 2010
44. ## Chem

given the reaction: agcl(s) +2nh3 (aq) ag (nh3)2 +(aq) + cl^- (aq). if more ammonia, nh3 is added to the system at equilibrium the a) amount of agcl increases b) system cannot achieve equilibrium c) rate of the forward reaction decreases d) concentration

asked by Mad on June 3, 2013
45. ## Physics

A system consists of two particles. Particle 1 with mass 2.0 kg is located at (2.0 m, 6.0 m) and has a velocity of (2.1 m/s, 4.1 m/s). Particle 2 with mass 4.5 kg is located at (4.0 m, 1.0 m) and has a velocity of (4.6 m/s, 4.6 m/s). Determine the position

asked by James on June 12, 2012
46. ## Calculus

I have the question :A small blood vessel of radius 2mm branches off at an angle(theta) from a larger blood vessel of radius 4mm. According to Poiseuille's Law the total resistance to the blood flow is proportional to

asked by Jessica on August 6, 2015
47. ## Pre-AP Chemistry

Volume (cm3 Area(cm2) Thickness (cm) .20 cm3 100 cm2 0.002 cm .28 cm3 122 cm2 0.002 cm .24 cm3 144 cm2 0.017 cm .41 cm3 225 cm2 0.0018cm If you had used a very crude balance that allowed only one significant figure, how would this have affected your

asked by Anonymous on October 7, 2010
48. ## ChemistryDrBob222

Concentrated sulfuric acid is 18.4 molar and has a density of 1.84 grams per milliliter. After dilution with water to 5.20 molar the solution has a density of 1.38 grams per milliliter. This concentration of H2SO4 is often used in lead storage

asked by Kevin on January 13, 2011
49. ## Algebra 2

1. A bag contains 12 red checkers and 6 black checkers. You will randomly select two checkers, one at a time, without replacement. (a) In how many ways can you select two checkers so that at least one of the checkers is red? List the ways. (b) What is the

asked by Jennifer on September 14, 2015
50. ## Algebra 2

1. A bag contains 12 red checkers and 6 black checkers. You will randomly select two checkers, one at a time, without replacement. (a) In how many ways can you select two checkers so that at least one of the checkers is red? List the ways. (b) What is the

asked by Matt on August 26, 2015
51. ## STATS/CHEM

I get how to use the method of least squares to determine slope, intercept, uncertainties in slope and intercept of your graph and but am confused how to determine the error of mole percent stated in (ii) The following are peak areas for chromatograms of

asked by Ashley on March 26, 2010
52. ## Chemistry

A saline solution contains 1.3% NaCl by mass. How much NaCl is present in 83.2g of this solution?

asked by Kelsey G on November 30, 2010
53. ## chemistry

a given sample of MgCl2 solution has 6×10^23 ions. what is the number of Cl(-1) ions in the same solution?

asked by hassan on July 16, 2016
54. ## Chemistry

If 4.7M SrLi2 solution is diluted to 45L, what is the molarity of the diluted solution?

asked by Jake on October 17, 2014
55. ## chemistry

if the %m/m of a solution of NaCl is 22%, how may grams of NaCl are present in 250g of solution?

asked by lisa on November 19, 2013
56. ## chemistry

I need a single reagent that I could use to distinguish between Pb(NO3)2 solution and Hg(NO3)2 solution.

asked by Jennifer on January 27, 2010
57. ## chemistry

A saline solution contains 1.1% NaCl by mass. How much NaCl is present in 87.2 g of this solution?

asked by Amee on March 11, 2013
58. ## chemistry

If the KmnO4 of the last problem is in 30.30mL of solution what is the molarity (M) of the KMnO4 solution?

asked by Anonymous on October 29, 2009
59. ## chemistry

What is the molarity of a salt water solution containing 8moles of salt in 2 L of solution?

asked by brenda on December 27, 2011
60. ## chemistry

Find the pH of a 0.010M solution of NH4ClO4 and the pH of a 0.010M solution of NH4C2H3O2.

asked by Hannah on April 18, 2009
61. ## chemistry

If the % m/m of a solution of NaCl is 22%, how many grams of NaCl are present in 250g of solution???/

asked by Mandy on February 25, 2012
62. ## chemistry

Starting with a 2.0 M NaOH solution, determine how you would prepare 1 L of a 0.1 M NaOH solution.

asked by Will on June 27, 2011
63. ## Chemistry

Is it always apparent in a solution which component is the solute, for example, in a solution of liquid in a liquid?

asked by Tyran on March 17, 2008
64. ## Chemistry

How many mL of 6.00 ppm solution are needed to make 4.00 L of a 0.100 ppm solution?

asked by Lopaka on December 5, 2012
65. ## Algebra

Is (0,3) a solution to the equation y=x+3? yes no Is (1,-4) a solution to the equation y=-2x? yes no I need help finding the answer. I don't know how to.

asked by ShowMeHow on October 21, 2015
66. ## Chemisty

You need 520. mL of a 15 % (m/v) glucose solution. If you have a 25% (m/v) glucose solution on hand, how many milliliters do you need?

asked by Jillian on December 4, 2015
67. ## chemistry

Make up a 500mL solution of 4.8M solution HCl (HCl gmw= 36.5g)

asked by Dena on September 9, 2012
68. ## Chemistry

Describe how you would prepare 500 mL of a 0.10 M solution of HCl from a 12.0 M solution of HCl.

asked by Sarah on November 3, 2015
69. ## Chemistry

A 3.0 -L sample of a 5.8 M NaCl solution is diluted to 65 L. What is the molarity of the diluted solution?

asked by Kelsey G on November 30, 2010
70. ## Chemistry

How can dilute a 1 M HCl solution to obtain 100 mL of HCl solution 0,1 M?

asked by Eliza on March 25, 2016
71. ## chemistry

A solution contains 3.10 g of solute in 10.4 g of solvent. What is the mass percent of the solute in the solution?

asked by karla on November 29, 2014
72. ## science

how much sugar is dissolved in 50grams of a solution if the solution is 20% sugar by mass

asked by kevin on March 10, 2013
73. ## math

Find a cubic polynomial p(x) so that the solution of p(x) ≤ 0 is [-2,1] or [4,∞). Is your polynomial the only one that gives this solution? Explain.

asked by Cat on March 8, 2017
74. ## Chemisty

You need 520. mL of a 15 % (m/v) glucose solution. If you have a 25% (m/v) glucose solution on hand, how many milliliters do you need?

asked by Jillian on December 4, 2015
75. ## Quantitative Analysis

The density of a 50-%(w/w) solution of NaOH is 2.0 g mL-1. How much of this solution is needed to prepare 1.0 L of 0.10 M NaOH?

asked by Aleah on September 13, 2011
76. ## chemistry

a 25% by mass H2SO4 solution has a density of 1.07 g/cm3 how much solution contains 13.37 g of H2SO4

asked by Annette lobos on April 5, 2016
77. ## chemistry

How do you make a 3 m solution of kbr? How many moles of kbr are in 1 liter of a .03 m solution?

asked by lisa on February 15, 2012
78. ## chemistry

a 2.3% (m/v) LiCI solution p;repared from 53.0 ml of a 10.0%(m/v)LiCI solution. what is volume in milliliters

asked by katie on April 27, 2013
79. ## organic chemistry

If you are given a 6.75% (wt./vol.) NaOCl solution, how many grams of NaOCl are in 100 mL of the solution? how do you do this please???

asked by Siral on February 1, 2012
80. ## chemistry

If 4.0L of a 4.7M SrCl2 solution is diluted to 45L , what is the molarity of the diluted solution?

asked by Sean1987 on October 6, 2013
81. ## chemistry

If 4.0L of a 4.7M SrCl2 solution is diluted to 45L , what is the molarity of the diluted solution?

asked by Anonymous on October 6, 2013
82. ## chemistry

How many grams of Na2CO3 are present in 18.4 mL of a 34.0% Na2CO3 solution. The density of the solution is 1.10 g/mL.

asked by britney on February 2, 2014
83. ## Chemistry

What is the molarity of a NaOH solution if 21.3 mL of the NaOH solution is neutralized by 10.4 mL of 6.10 M H3PO4?

asked by taytay on April 20, 2014
84. ## Science

Why is it easier to recover silver from a solution than to recover lithium from the same solution

asked by Josephine on November 18, 2015
85. ## Chemistry

Weight of solution is 1026gm in aqueous solution.what will be the weight of per kg H2O?

asked by Dipika Dang on March 29, 2015
86. ## Chemistry

Why can a water-ethanol solution be used for recrystallization but not a water-hexane solution?

asked by david on September 20, 2012
87. ## Science

how would you make 1 molar solution using 4 molar solution and pure water?

asked by Kayla on June 9, 2011
88. ## Chemistry

What volume of a 3M KOH solution can be prepared by diluting 0.5L of a 5M KOH solution?

asked by Adriane on March 18, 2012
89. ## Chem

What volume (L) of a 3M KOH solution can be prepared by diluting 0.5 L of a 5M KOH solution?

asked by Swwetie on July 27, 2012
90. ## chemistry

How many liters of 2.09 HCl solution would be needed to prepare 1.14 L of 0.69 M HCl solution?

asked by Isaiah on February 27, 2013
91. ## Chemistry

150cm3 of KOH solution containing 5.6g of KOH per dm3 of solution.what is the concentration?

asked by Kene on March 29, 2013
92. ## chemistry

a metal X that reacts with metal Y in a solution of Y but does not react with Z in a solution of Z means that ........

asked by Ms Joy on September 14, 2015
93. ## science

You need 5.00 grams of AgNO3. You have a 1.25 molar solution. What volume of that solution contains 5.00 grams?

asked by MICHELLE on November 11, 2010
94. ## chemistry

A solution of KOH is prepared by dissolving 2.00 g of KOH in water to a final volume of 250 ml of solution what volume of this solution will neutralize 20.0 ml of 0.115 mol/L sulfuric acid? amount of KOH= 2.00g(1mol of KOH/ 56.01g)= 0.357 moles

asked by Mariam on September 2, 2015
95. ## biochemistry

The enzyme alcohol dehydrogenase catalyzes the following reaction: Ethanol + NAD+  acetaldehyde + NADH + H+ You have a 1 ml solution containing 100 µM Ethanol, and 1 mM NAD+. You then add 1 mg of alcohol dehydrogenase. Assume all of the ethanol gets

asked by sheaa on September 10, 2013
96. ## institute of health sciences

Chemistry A) determine the mass of sodium hydroxide needed to prepare 100ml of 0.5M standard solution B) describe the procedure used to prepare the standard solution C) use the 100ml stock solution of 0.5M sodium hydroxide to neutralize H2SO4 by volumetric

asked by trendy on November 12, 2015
97. ## Computer Architecture

Assume a simple model for floating-point representation is used, the representation uses a 16-bit format, 5 bits for the exponent, with a bias of 16, a normalized significand of 8-bits, and a single sign bit for the number. I)Show how the computer would

asked by Dalaal on April 11, 2015
98. ## Physics urgent help needed

The pressure and volume of a gas are changed along a path ABCA in the figure. The vertical divisions on the graph represent 2.5 105 Pa, and the horizontal divisions represent 1.0 10-3 m3. Determine the work done (including algebraic sign) in each segment

asked by Papito on April 25, 2007
99. ## math

Nancy Tai has recently opened a revolving charge account with MasterCard. Her credit limit is \$1,000, but she has not charged that much since opening the account. Nancy hasn’t had the time to review her monthly statements promptly as she should, but over

asked by fila on March 30, 2016
100. ## organic chem lab

I have been given the below information and asked to calculate the amount solvent and reactants needed to be used to obtain 1.0 g of the product. Benzyltriphenylphosphonium chloride. In a 100 mL round bottom flask (rbf), 5.2 g triphenylphosphine was

asked by Jamshid on July 5, 2006