# 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

91,330 questions, page 541
1. ## Precalculus

Homework help quick given f(x)= (X+1)/(x) and g(x)= x squared +1 find (g X f)(-9) the options are 145/21 83/82 145/64 17/9 this is a homework question and it is due tommorow can u also explain or show how you arrived at that answer Thanks in advance by X i

asked by HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! on February 17, 2010
2. ## grammar

principal parts of hold,swell,hear,win one complete sentance for each expression to show clearly how it differ in meaning from the expression in the group.to conpare with. to compare to b.to charge for. to charge with

asked by Sehr on December 29, 2009
3. ## CHEMISTRY LAB urgent assistance

1 (A) This relation gives the dissociation constant of acetic acid (CH3COOH) Ka = [H3O+][CH3COO-]\[CH3COOH] Starting from this relationship show that pH = pKa + log [base]\[acid] urgently need assistance

asked by Petty on September 22, 2011
4. ## physics

an object is projected with a velocity of 10m/s from the ground level at an angle to the vertically, the total time of flight of projectile os 10secs. calculate angle when (g=10m/s) show workings

asked by Anonymous on February 12, 2015
5. ## Discrete Math - Vectors

Can you please help me correct my answers for the following two questions? 1) A tour boat travels 25 km due east and then 15 km S50°E. Represent these displacements in a vector diagram, then calculate the resultant displacement. ====== My Work: I drew the

asked by Anonymous on February 10, 2008
6. ## maths

please help im quite stuck with this question a boat sails in a straight line, its position at time t is (-t+600,2t-300). a man stands on a small island, at position (200,100). due to fog, he can see objects of radius 200m centred at his position. a) find

asked by braidy on May 21, 2007
7. ## Math for Steve

1. Identify the part, whole, and percent in the following statement: Find 15% of 750. a. part = 750, whole = n, percent = 15 b. part = 15, whole = 750, percent = p c. part = n, whole = 750, percent = 15 d. none of these 2. Write a percent equation that can

asked by Jman on November 6, 2012
8. ## physics

Sue and Jenny kick a soccer ball at exactly the same time.Sue's foot exerts a force of 62.3 N to the north. Jenny's foot exerts a force of 115.9 N to the east. What is the magnitude of the resultant force on the ball? Answer in N. What is the direction of

asked by alexa on July 2, 2011
9. ## L.A.

Thomas: Come on, Patrick you'll have fun. You'll learn alot, and you'll be helping a family have a home that they otherwise couldn't afford. Patrick: I don't know, Thomas. I've never built anything before, much less a house. Thomas: You don't have to build

asked by Gracious Human on May 13, 2016
10. ## Computer programming

Sorting is a common operation used in programming. Although languages such as Visual Basic 2008 offer built-in methods for sorting, other languages such as C do not support such a method. In order to be a programmer you should be able to implement such

asked by Brenda on August 17, 2010
11. ## Physics

A double lens system is made of +35.0 cm lens (lens #1) and a - 26.0 cm lens (lens #2). Lens #1 is placed at x = 0 cm on a meter stick and lens #2 is placed at x = 30.0 cm. Where on the meter stick will the final image be formed when looking at a distant

asked by A on March 29, 2016
12. ## Physics- Optics

A double lens system is made of +35.0 cm lens (lens #1) and a - 26.0 cm lens (lens #2). Lens #1 is placed at x = 0 cm on a meter stick and lens #2 is placed at x = 30.0 cm. Where on the meter stick will the final image be formed when looking at a distant

asked by B on April 5, 2016
13. ## Phys-Lens Question

A double lens system is made of +35.0 cm lens (lens #1) and a - 26.0 cm lens (lens #2). Lens #1 is placed at x = 0 cm on a meter stick and lens #2 is placed at x = 30.0 cm. Where on the meter stick will the final image be formed when looking at a distant

asked by A on March 30, 2016
14. ## Same substances?

Question: Two substances, A and B, have the same melting point. how can you determine if they are the same without using any form of spectroscopy? Explain in detail. My answer: Perform a mixture melting point. In this procedure, pulverize and mix A and B

asked by Sheryl on October 1, 2006
15. ## Science

1. convert .621 hl to liters? 2. Convert .013 dl to liters? 3. Convert .00078 mg to kg? 4. Convert 2.45 g to cg? 5. convert 1.9 km to cm? 6. convert .0476 mm to dam? 7. Convert 6.4 ul to nl? Do them all this way: (a) figure out what the units mean. For

asked by Biologyconfused.... on January 14, 2007
16. ## Math/Calculus

A spring with a 4 kg mass has natural length 1 m and is maintained stretched to a length of 1.3 m by a force of 24.3 N. If the spring is compressed to a length of 0.8 m and then released with zero velocity, find the position of the mass at any time t. Here

asked by COFFEE on July 11, 2007
17. ## math 117

1. Answer the following questions. Use Equation Editor to write mathematical expressions and equations. First, save this file to your hard drive by selecting Save As from the File menu. Click the white space below each question to maintain proper

asked by Anonymous on October 9, 2011
18. ## statistics

in the spring of 2001, a university had 40,000 registered students. to estimate the percentage of all students expecting to graduate in 4 years, a simple random sample of 225 students was drawn, 144 of the sample planned to graduate in 4 years. (a) were

asked by anonymous on May 8, 2014
19. ## Conducting a Buddhist-Style Fast

Hi everyone! In my quest to better understand Buddha and his teachings, I have decided to conduct a three-day fast in the hopes of having an experience of enlightenment. I got permission from my school to take three days off from school this week

asked by Tyler on April 29, 2007
20. ## Math /Algebra

I was challenged with this question: Explain why the formula for determining slope using the coordinated of two points does not apply to vertical lines. This was my answer: The formula for determining a slope using two points does not apply to vertical

asked by Liza on November 18, 2009
21. ## Chemistry

5.00 liter steel cylinder is filled with water vapor at 100 °C and 650 mm Hg. The problem I am having is whether the 5.00L significant in the problem and if so where? a. Determine the density of this gas sample. b. Determine the mass of water that

asked by Anonymous on July 11, 2011
22. ## Social Studies

1. Which statement explains why the British system of government is a constitutional monarchy? A. The prime minister is chosen according to the constitution. B. The king or queen has more power than the elected Parliament. C. A king or queen is the head of

asked by dori on February 24, 2019
23. ## Need help pleas (science)

. Why are energy transformation important for an ecosystem's stability? . What is the role of photosynthesis I'm making energy "usable" for life? . What is the link between decomposition and photosynthesis? . What is the connection of energy flow through

asked by Sofia (bizz) on October 21, 2014
24. ## chemistry

A fixed amount of oxygen gas is held in a .500 L tank at a pressure of 4.68 atm. The tank is connected to an empty 1.50 L tank by a tube with a valve. After this valve has been opened and the oxygen is allowed to flow freely between the two tanks at a

asked by Brianna on March 23, 2017
25. ## Science

. Why are energy transformation important for an ecosystem's stability? . What is the role of photosynthesis I'm making energy "usable" for life? . What is the link between decomposition and photosynthesis? . What is the connection of energy flow through

asked by Sofia (bizz) on October 21, 2014
26. ## Math

Find the exact values for the lengths of the labeled segments a, b and p drawn in green, red, and blue, respectively. Note that r=3 is the radius of the circle, and s=2 is the arc length from the point (3,0) around the circle to the indicated point. (So

asked by Kayla on March 14, 2017

The flywheel has a radius of 600mm.a mass of 144kg.and a radius of gyration of 450mm. An 18kg block A is attached to a wire that wrapped around the flywheel.and the system is released from rest.neglecting the effect of friction. Determine the acceleration

asked by ahmed talal on May 16, 2014
28. ## Science

. Why are energy transformation important for an ecosystem's stability? . What is the role of photosynthesis I'm making energy "usable" for life? . What is the link between decomposition and photosynthesis? . What is the connection of energy flow through

asked by Bizz on October 21, 2014
29. ## History

Which statement explains why the British system of government is a constitutional monarchy? A. The prime minister is chosen according to the constitution. B. The king or queen has more power than the elected Parliament. C. A king or queen is the head of

asked by U DONT KNOW ME on March 13, 2019

Which one of these statements is true about a "bumper-to-bumper" warranty. A. Normal wear and tear is NOT covered by the warranty. B. All expenses except gasoline and routine oil changes are covered by the warranty. C. Every part and system is covered

asked by Kristen on May 1, 2014

Learning economics is like having you own crystal ball. The more you understand it as a social science, the more you understand how our economy and political system works. I say like a crystal ball, because you will be able to see things that other people

asked by Crissy on January 23, 2012
32. ## Chemistry

Consider the reaction: N2O4(g) 2NO2(g) delta H^o =58.576kJ; Keq =0.87 at 55degrees celsius What is the effect of each of these changes upon the concentration of N2O4 at equilibrium? a)increasing the temperature b)increasing the volume c) adding more NO2(g)

asked by Danielle on April 2, 2012
33. ## Chemistry

A fixed amount of oxygen gas is held in a .500 L tank at a pressure of 4.09 atm. The tank is connected to an empty 1.50 L tank by a tube with a valve. After this valve has been opened and the oxygen is allowed to flow freely between the two tanks at a

asked by robert on March 25, 2017
34. ## chem

Consider the following chemical equilibrium: SO3(g) --> SO2(g) + 1/2 O2(g) and Delta H = 98.9J i. adding oxygen gas ii. compressing the system at constant temperature iii. adding argon gas iv. removing sulfur dioxide gas v. decreasing the temperature Which

asked by Anonymous on March 9, 2008
35. ## Physics

An object of mass m1 is placed on an inclined plane (angle theta above the horizontal) is connected by a string going over a pulley to a hanging object of mass m2. Determine the acceleration of the system if there is no friction between object 1 and the

asked by Anna on October 23, 2016
36. ## Physics 12

A block mass m1 lying on a frictionless inclined plane is connected to a mass m2 by a massless cord passing over a pulley. 1.) determine a formula for the acceleration of the system in terms of m1, m2, Ө, and g. 2.)what conditions apply to mass m1 and m2

asked by Anon on February 26, 2012

I hope these corrections weren't too late, but I have the feeling they were. I think the Cal State and UC applications have to be postmarked by midnight on Nov 30, right? If so, please make sure you also work on NOT doing things that are this important at

asked by Writeacher on December 1, 2006
38. ## phisic

(a) One such reaction fuses two nuclei of carbon-12 (12/6C ) to form an atom of neon (20/10Ne ) with the emission of an α-particle. Write an equation for this process, indicating the atomic number and mass number of each of the products in the usual way.

39. ## Finance

1. Briarcrest Condiments is a spice-making firm. Recently, it developed a new process for producing spices. The process requires new machinery that would cost \$2,218,246. have a life of five years, and would produce the cash flows shown in the following

asked by Inquiring Mind on August 23, 2013
40. ## english

Elnora unlocked the case, took out the pail, put the napkin in it, pulled the ribbon from her hair, binding it down tightly again and followed to the road. From afar she could see her mother in the doorway. She blinked her eyes, and tried to smile as she

asked by 2phoneeeeee on November 17, 2014
41. ## Chemistry

Hello this is my first experiment I've ever done before and it was fun but I gotta figure out what NaCl produced and what it yielded in percentage. Can someone double check my work. Na2CO3+2HCl=2NaCl+H2O+CO2 Mass of empty crucible & cover: 33.076g Mass of

asked by Henry on November 12, 2017
42. ## Math for Chem Lab

There are two ways in which you can obtain results from a completed graph. One is by interpolation and the other is by extrapolation. What is the difference between these two terms and which one do you believe may lead to erroneous conclusions and why? My

asked by Marisol on February 7, 2007
43. ## brown

parker wants to buy as many toys as she can with her 10\$she can buy individule ponies for 2\$ each or a set of 2 dolls for \$3 what she she buy and why what do you need to find out what operations will you use why write a number sentence to show how you

asked by jennie on November 9, 2011
44. ## PHYSICS

A circular curve of highway with radius 200m is designed for traffic moving at 100km/h, and is banked so that cars can make the curve even without friction at that speed. What is the correct angle of banking for this curve? Show steps, please.

asked by Joey on April 19, 2010
45. ## Chemistry

Hi DrBob, thanks for getting back to me on the earlier related question, but to be honest I am COMPLETELY lost on this! Can you please show me how your worked out the answere using the figures from the question. Thanks. Question: (a) How much sodium

asked by Gille on September 2, 2009
46. ## Art

1. Which textile technique do quilters use to craft blankets? A. weaving B. knitting ** C. stitchery ** D. cross-stitching I think B or C 2. Native American weavers often depicted abstract patterns that represented which of the following? A. friendship B.

asked by Pewf on June 2, 2016
47. ## chemistry

chemistry posted by Naomi today at 8:03pm. The material Magnesium Sulfate What mass of dry material would be needed to make an aqueous solution with a molality of 4 moles/kg solution ? What mass of water is needed? 4 (24.305+ 32.065+ (4 x 15.999)) =481.5

asked by Confused!(Naomi) on January 17, 2018
48. ## Chemistry

This is a lab I have, but have no clue what to do. Please do out the steps so i can understand. Reactions and Data: NaOH(s)--> Na1+(aq)+ OH1-(aq) (Heat of solution of NaOH) This reaction involves adding solid NaOH to water and watching the temperature

asked by Carrie on December 31, 2011
49. ## Physics - spring balls

A 275g ball is resting on top of the spring that is mounted on the floor. You exert a force of 325N on the ball and it compresses the spring 44.5cm. If you release the ball from the position, how high above the equilibrium position of the spring-ball

asked by Anonymous on October 27, 2010
50. ## Physics - Eqilibrium position of a spring-ball

A 275g ball is resting on top of the spring that is mounted on the floor. You exert a force of 325N on the ball and it compresses the spring 44.5cm. If you release the ball from the position, how high above the equilibrium position of the spring-ball

asked by Anonymous on October 26, 2010
51. ## Physics - spring balls

A 275g ball is resting on top of the spring that is mounted on the floor. You exert a force of 325N on the ball and it compresses the spring 44.5cm. If you release the ball from the position, how high above the equilibrium position of the spring-ball

asked by Anonymous on October 27, 2010
52. ## Physics - Spring balls

A 275g ball is resting on top of the spring that is mounted on the floor. You exert a force of 325N on the ball and it compresses the spring 44.5cm. If you release the ball from the position, how high above the equilibrium position of the spring-ball

asked by Farah on October 30, 2010
53. ## Physics - Spring balls

A 275g ball is resting on top of the spring that is mounted on the floor. You exert a force of 325N on the ball and it compresses the spring 44.5cm. If you release the ball from the position, how high above the equilibrium position of the spring-ball

asked by Anonymous on October 29, 2010
54. ## chemistry

What is the mass percent of a solution if 42.9 grams of aspirin is dissolved into 175 mL of ethanol? (Density of ethanol is 0.789 g/mL) 1. 31.1 % 2. 24.5 % 3. 23.7 % 4. 19.7 %

asked by katie on November 29, 2011
55. ## chem

Calculate the number of moles of the indicated ion present in each of the following solutions. Na+ ion in 1.20 L of 0.183 M Na2SO4 solution = ?mol

asked by shawn on December 1, 2010
56. ## usm

A volume of 10.0 of a 0.190 solution is titrated with 0.770. Calculate the volume of required to reach the equivalence point.

asked by ren on October 29, 2012
57. ## Chemisty

By titration it is found that 12.1 mL of 0.130 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution.

asked by Tara on April 27, 2016
58. ## Trigonometry (Coterminal Angles)

What is the SMALLEST POSITIVE ANGLE that is coterminal with the angle having the radian measure of -10π/3? Is there any solution for this kind of question?

asked by Bryle on February 20, 2015
59. ## math (mixed Review

Is the number given a solution of the equation? 2y+8=4y-2;5 Put in y=5 , and see if the two sides of the equation are equal. yes write each as a fraction. 0.1= I do not how to do mixed review

asked by tonya on September 6, 2006
60. ## Math help

There is a center circle with eight circles connected to it. A. Place numbers 24 through 32 so the sums are all the same. B. How many numbers can be placed in the middle to obtain a solution?

asked by KG on September 19, 2014
61. ## Calculus

Find the solution t the differential equation dz/dt = 2te^z that passes through the origin. My answer is -In (1-t^2), but my answer is populating as incorrect. Can someone help please?

asked by Latoya on November 20, 2015
62. ## chemistry

What volume ( L ) of the solute methanol should be mixed with 3.41 L of the solvent ethanol to make a solution that is 11.0 m methanol? Am I supposed to use the molality eq'n?

asked by Anonymous on March 2, 2010
63. ## Chemistry

What volume (mL) of the solvent benzene should be added to 142 mL of the solute CH3CN to generate a solution that is 2.68% by mass CH3CN?

asked by Scott on September 2, 2008
64. ## chemistry

. What is the mass concentration (titer) is a solution of sulfuric acid with the molar concentration equivalent 0.5 mol/dm3?

asked by michelle on November 15, 2012
65. ## college general chemistry 2

a chemist titrates 70 ml of .7889M HClO solution with .6221M KOH. calculate pH at equivalence. pKa of HClO is 7.50 I am getting pH of 17.72 Is that right?

asked by osp on April 3, 2016
66. ## Chemistry

What is the pH of a 0.051 M solution of Phosphorous acid (H2PHO3) in water? The value of Ka1 for H2PHO3 is 1.600 x 10-2 and the value of Ka2 is 7.000 x 10-7.

asked by Summer on January 17, 2012
67. ## chemistry

can calcium hydroxide solution be used to distinguish Co(NO3)2 and Fe(NO3)3 sloutions using only the titration technidue presented in this lab

asked by kendar on October 9, 2013
68. ## Org. Chem.

When sucrose is fermented to produce ethanol why is it not possible to obtain a final solution containing more than 10-15% ethanol? Does this have to do with azeotropes? However, I thought this was possible? I am confused, please help.

asked by CMM on December 7, 2009
69. ## Chemistry

What volume (mL) of the solute ethanol should be combines with 2.44L of the solvent H2O to prepare a solution that is 8.03m ethanol?

asked by Lisa on June 6, 2010
70. ## Chemistry

By titration it is found that 68.9 mL of 0.122 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution.

asked by Jason on November 22, 2010
71. ## chem

What weight of potassium bromide, KBr, could be recovered by evaporating 650.0 g of 15.0 percent KBr solution to dryness?

asked by byke on November 21, 2012
72. ## Chemistry

What is the pH of a solution prepared by mixing 25.00 mL of 0.10 M CH3CO2H with 25.00 mL of 0.030 M CH3CO2Na? Assume that the volume of the solutions are additive and that a = 1.8 × 10-5 for CH3CO2H.

asked by Veronica on April 19, 2013
73. ## chemistry

Calculate the mass of HCl required to prepare 2.5 liters of a 0.08 molar solution of HCl. H 1.01 Hydrogen 17 Cl 35.45 Chlorine

asked by archie on September 26, 2011
74. ## Chemistry

By titration it is found that 69.9 mL of 0.151 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution.

asked by Janessa on November 19, 2012
75. ## osu

a 50.0 ml sample of a 15% (m/v) solution of H2SO4 is added to water to give a final volume of 250.0 ml. What would the final concentration be?

asked by Kat on November 23, 2010
76. ## chemistry

what would be the vapor pressure of water in a solution wiith 23.7g NaCl dissolved in 500mL of water at 50degrees centigrade

asked by re on September 22, 2011
77. ## Chemistry

If the concentration of I^-1 is found to be 2.4x10^-3 mol/L in a saturated solution of PbI2, what is the Ksp of PbI2? The given answer is 6.9x10^-9

asked by Hunter on November 30, 2017
78. ## Chemistry

A student measures k for a certain blue dye to be 19.4 M^-1 at 560 nm. What is the molarity of the dye in a solution with an absorbance of 0.118 at this wavelength?

asked by Gabby on November 21, 2012
79. ## chemistry

10.0 mg of a certain protein were dissolved in water to make a solution of 3.50 mL at 28.0o C. If the osmotic pressure is 1.30 torr, what is the molar mass of the protein?

asked by lizz on October 15, 2010
80. ## math

40% of k liters of acid are added to 60% of w liters of water. Write an algebraic expression for the total volume of the solution.

asked by Anonymous on January 9, 2017
81. ## chemistry

calculate the freezing point of an aqueous solution of 15.5 grams of glucose dissolved in 150 grams of water

asked by Sara on March 22, 2014
82. ## chemistry

If the concentration of Pb^2+ is known to be roughly 2.1 x 10 to the power of -9 mol/L within a saturated solution of Pb(PO4)2, calculate the Ksp of Pb3(PO4)2?

asked by Angelo on April 9, 2008
83. ## chemistry

Acetic acid (CH3CO2H) is a weak acid. As a result, a solution of sodium acetate (NaCH3CO2) will be _____.

asked by ana on January 6, 2014
84. ## Math

One of two similar triangles has an area of 1/4 times that of the other. What is the ratio of its perimeter of the triangles? (I know the answer but I don't know the solution, please explain. Thank you very much!!)

asked by Anonymous on February 22, 2015
85. ## science

Why is it difficult to distinguish between some pure substances and solutions? What methods can overcome this to define if either it is a pure substance or solution?

asked by Sunny on April 14, 2013
86. ## Chemistry

A 25 mL sample of wine is found to have a concentration of acetic acid of 0.23 M. If this was titrated with a 0.16 M NaOH solution how many mL's of NaOH would be required?

asked by Susan on November 27, 2010
87. ## analytical chemistry

compund x is known to absorb at 510nm. If you dilute a solution containing x by 1/4, by how much does the absorbance increase or decrease. if it stays the same just state it stays the same.why

asked by ami on March 26, 2013
88. ## Chemistry

Find the mass of urea (CH4N2O) needed to prepare 50.9 g of a solution in water in which the mole fraction of urea is 7.69×10−2.

asked by Nicole on February 24, 2016
89. ## Chemistry

Calculate how many grams of FeSO4.7 H2O (MW = 278.02 g/mol) will be needed to prepare 1 mL of a 0.2 M FeSO4 solution? Is that .0304g?

asked by Feufolia on February 25, 2016
90. ## chemistry

a solution of nickel sulphate in which nickel rod is dipped is diluted 10 times. the reduction potential of Ni at 298 K is?

asked by Anushka on June 5, 2016
91. ## science

calculate the mass of sodium sulphate required to prepare its 20%(mass percent) solution in 100 g of water

asked by irsha on September 6, 2011
92. ## chemistry

according to the data in the merck index,if 1,0g of aspirin is dissolved in 100ml of water at 37,how much aspirin will precipitate out of solution when it is cooled to 25.

asked by peter on March 18, 2017
93. ## english

Need answers for these about "A Modest Proposal" PLEASE 2. Type of Satire? Horatian or Juvenalian 4. Fiction or non-fiction? 5. Problem = 6. Solution =

asked by McKale on January 30, 2014
94. ## Vectors

determine the number of solutions, the generalized parametric solution, and explain why there are no integer solutions for the equation 2x+10y=31

asked by Sara on March 17, 2015
95. ## Chemistry

What is the molality of a solution prepared by dissolving 81.5 g of ethylene glycol, HOCH2CH2OH, in 1.36 L of water? Assume the density of water is 1.00 g/ml.

asked by Silvie on November 17, 2011
96. ## Math

1. Determine which ordered pair is a solution of y = x^2-2 (5, 21), (–5, 24), (–1, –1), •• (–2, 6) 2. Without graphing, tell whether the line containing (6, –3) and (0, –8) is horizontal, vertical, or neither I think it's horizontal Correct

asked by Queen on April 10, 2016
97. ## chemistry

What is the molality of a solution prepared by dissolving 75.2 g of ethylene glycol, HOCH2CH2OH, in 1.34 L of water? Assume the density of water is 1.00 g/ml.

asked by Silvie on November 17, 2011
98. ## chemistry

Calculate the mass of sodium phosphate required to prepare 1.75 L of solution in which the sodium ion concentration is 0.25 mol/L

asked by Zilly on January 8, 2015