# 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 217
1. ## 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
2. ## 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
3. ## 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
4. ## 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
5. ## 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
6. ## 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
7. ## 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
8. ## 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
9. ## 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
10. ## 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
11. ## 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
12. ## 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
13. ## 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
14. ## 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
15. ## 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
16. ## 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
17. ## 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
18. ## 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
19. ## 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
20. ## 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
21. ## 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
22. ## 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
23. ## 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
24. ## 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
25. ## 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
26. ## 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
27. ## 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
28. ## 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
29. ## 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
30. ## 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
31. ## 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
32. ## 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
33. ## 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
34. ## 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
35. ## 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
36. ## 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
37. ## 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
38. ## 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
39. ## 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
40. ## 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
41. ## 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
42. ## 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
43. ## 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
44. ## Science

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

asked by Kayla on June 9, 2011
45. ## 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
46. ## 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
47. ## 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
48. ## 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
49. ## 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
50. ## 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
51. ## 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
52. ## 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
53. ## 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
54. ## 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
55. ## 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
56. ## 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
57. ## chemistry

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

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

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

asked by david on September 20, 2012
59. ## 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
60. ## 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
61. ## 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
62. ## 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
63. ## 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
64. ## 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
65. ## 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
66. ## 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
67. ## 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
68. ## 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
69. ## 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
70. ## 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
71. ## 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
72. ## 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
73. ## 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
74. ## 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
75. ## 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
76. ## 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
77. ## 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
78. ## 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
79. ## Chemistry

A Stock solution has a total volume of 1.5l. It is diluted by removing 10 ml of the stock and adding 90 ml of water. the diluted solution has a concentration of the solute of 40mg/l a, what is the concentration of the solute in the stock solution? b, How

asked by Tony Ayo on October 6, 2015
80. ## 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
81. ## 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
82. ## chemistry

1. A 2.00 g sample of a particular compound was dissolved in 15.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85ºC. For pure CCl4, TB = 76.50ºC and KB = 5.03°C·kg/mol Calculate the boiling point elevation,

asked by sarah on May 4, 2014
83. ## 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
84. ## 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
85. ## Chemistry

Accurately weigh 0.9-1.1 g into a 200 mL beaker. Dissolve the KIO3 in a small amount of distilled water. Quantitatively transfer, with rinsing, to a 500 mL volumetric flask. Dilute to the calibration mark and shake well. Rinse the buret several times with

asked by Jessica Horen on September 30, 2014
86. ## Math

It costs Luis \$5 to park his car at a parking meter for 2 hours. What is the price to park for 1 hour? Write a word sentence to help you solve the problem. Then write and solve a multiplication equation. Please help me.

asked by BOI on February 8, 2018
87. ## algebra 2

i need help with my algebra 2 homework, the section is called using matrices to represent data. here is one of the problems: -1/2A+(B-A) A=[7 3 -1 5] [-2 8 0 -4] and B= [6 0 11 -3] [-5 2 -8 9] i don't know how to do this problem and the book doesn't have a

asked by brittany on March 17, 2009
88. ## REPOST--Statistics

Ten cards, the 2 through 6 of spades and the 2 through the 6 of diamonds, are shuffled thoroughly and then taken one by one from the top of the deck and placed on the table. I know how to solve the first question (I think), but how would I solve the second

asked by Anonymous on October 18, 2007
89. ## Chemistry

A 630. mL flask contains O2 at a pressure of 0.75 atm and a temperature of 20°C. What mass of O2 is present? I know you Use PV = nRT and solve for n = number of mols gas. Then n = grams/molar mass and solve for grams. But I get the wrong answer

asked by Chelsey on February 26, 2014
90. ## Algebra

Is (0,3) a solution to the equation y =x + 3 his is my teachers answer to my question of usage of the 2 numbers mentioned as possible solutions. yes it does make a difference. (4,8) is called an ordered pair. Ordered pairs are always in the form (x,y) That

asked by Faye on August 26, 2014
91. ## chemistry

The heat of solution of ammonium nitrate is 26.2 kJ/mol, and a 7.315 g sample of NH4NO3 is added to 40.0 mL of water in a constant pressure calorimeter initially at 25.2°C, what is the final temperature reached by the solution? (The specific heat of water

asked by gentil on October 20, 2014
92. ## chemistry

a 23.74 ml volume of .0981 M NaOH was used to titrate 25 mL of a weak monoprotic acid solution to the stoichiometric point. determine the molar concentration of the weak acid solution. Express your answer to the correct number of significant figures.

asked by Joann on April 1, 2013
93. ## Chemistry

Acetic acid dissociates/ionizes itself as follows: CH3COOH(aq) ⇔ H+(aq) + CH3COO-(aq) If you add sodium acetate, CH3COONa, to the solution: a) a precipitate will be formed b) more acetic acid will be ionized c) the concentration of hydrogen ions will

asked by Andrea on May 15, 2012
94. ## chemistry

We have 1L of 0.1mol/l solution of ammonium chloride, with pKa 9.2 for NH4+/NH3 Place in an increasing order on a pKa axis the different conjugate acid /base pairs present in the solution. Write the equation of the different reactions that may take place

asked by angy on January 15, 2017
95. ## Chemistry

A sample of 7.52 grams of Na OH is dissolved into 675 mL of aqueous M NaOH (assume no volume change). This solution is then poured into 1.95 gallons of water. (You may assume that the two volumes can be added.) What is the concentration of NaOH in the

asked by Cheyenne on September 23, 2010
96. ## Gen CHEM 2

I need to produce a buffer solution that has pH 5.28. I have already 10 mmol of acetic acid. How much solid sodium acetate will i need to add to this solution? pKa of acetic acid is 4.74. I plugged in all my info to the Hendersen/Hasslebalch equation but I

asked by Jessica on February 11, 2008
97. ## Pre Cal---Fix to the question below

Let P be the point on the unit circle U that corresponds to t. Find the coordinates of P and the exact values of the trigonometric functions of t, whenever possible. (If there is no solution, enter NO SOLUTION.) 4pi = ( , ) sin(4pi) = cos(4pi) = tan(pi) =

asked by Karmen on February 9, 2010
98. ## Chemistry

Assume you dissolve 0.235 g of the weak acid benzoic acid, C6H5CO2H, in enough water to make 4.00*10^2 mL of solution and then titrate the solution with 0.138 M NaOH. C6H5CO2H(aq) + OH-(aq) C6H5CO2-(aq) + H2O(l) Find concentration of Na+ at equivalence

asked by john on April 21, 2013
99. ## Differential Equations

Find the general solution of the given differential equation. x dy/dx − y = x^2 sin x I have solved to: y = -x cos(x) + cx The second part of the question is to give the largest interval over which the general solution is defined. I would think it would

asked by Jefferson on February 1, 2018
100. ## Chem Help PLEASE!

Asked earlier but got no reply :/ hopefully I get one now cause I'm really stuck and can't completely my assignment cause of one question.. How many grams of dry NH4Cl need to be added to 1.90 L of a 0.200 M solution of ammonia, NH3, to prepare a buffer

asked by Taylor on March 14, 2012