# 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 421
1. ## math

solve the following inequality /3x + 12/ >/ 21 PS >/ means greater than or equal to.

asked by lindsay on December 12, 2013
2. ## math

Solve by reverse FOIL: 14x^2+48x+18=0

asked by shonye on February 13, 2013
3. ## differential equation

dy/dx=x+y, y(0)=1 How do I solve for y(x)? I know the answer is y(x)=2e^x-x-1, but I forgot how to do these kinds of problems again.

asked by Anonymous on August 11, 2008
4. ## Math

Two questions (use number sense to solve the equation) 1. 3x + 14 = 23 a. 3 b.6 c.9 d.4 2. Your class collected more than 250 cans of food in two weeks for the annual food drive. In the first week, 115 cans were collected. How many cans c of food were

asked by Abella on November 27, 2018
5. ## math

Could you please solve so I can double check my answers for the practice quiz? Thank You!! 1. Solve x^3 + 6x^2 + 13x + 10 = 0. a) –2 + 2i, –2 –2i, –2 b) 2 + i, 2 – i, –2 c) –2 + i, –2 – i, –2 d) 2 + 2i, 2 – 2i, –2 2. Find the

asked by cal on October 7, 2008
6. ## Physics repost please check

Three moles of an ideal monatomic gas are at a temperature of 345 K. Then, 2531 J of heat are added to the gas, and 1101 J of work are done on it. What is the final temperature of the gas? delta U= 3/2nR(T final -T initial) (2531J - 1101J) =

asked by Mary on April 16, 2007
7. ## algebra (quadratic formula0

or the period 1990-2003, the amount of biscuits, pastas, and noodles y (in thousands of metric tons)imported into the united states ca be modeled by the function y=1.36(xsquared)+ 27.8x+304 where x is the number of year since 1990. a.write and solve an

asked by Bri on March 22, 2011
8. ## basic Integration

I have three questions which I apparently have 'wrong' according to the book, but I've done lots of other questions which I've gotten right using the same method and I have triple checked these answers for these three questions so I was wondering if

asked by Anonymous on February 28, 2009
9. ## statistics

Does it ever seem to you that the weather is nice during the work week, but lousy on the weekend? Cerveny and Balling (1998) have confirmed that this is not your imagination—pollution accumulating during the work week most likely spoils the weekend

asked by Liz on June 22, 2011
10. ## Chem

How will you make a 200 mL solution of 1 mM sucrose from a 0.1 M sucrose solution? 1. Mix 20 mL of the 100 mM sucrose and 180 mL of water. 2. Mix 50 mL of the 100 mM sucrose and 150 mL of water. 3. Mix 1 mL of the 100 mM sucrose and 199 mL of water. 4. Mix

asked by Roksana on May 4, 2010
11. ## Chemistry

How many grams of KOH must be dissolved in one litre of solution to give it a pH value of 12?

asked by Sahil on June 29, 2011
12. ## Algebra

I am helping my granddaughter in algebra and need to know how to get the answer. What is a solution of x² + 6x = –5? x = –6 x = –1 (I say this one) x = 1 * (she thinks it is this one) x = 6

asked by Anonymous on October 30, 2014
13. ## Chemistry

Calculate the molarity of a 5.4% sodium hydroxide solution whose density is 1.07 g/mL.

asked by anaymous on December 6, 2010
14. ## maths

How many ordered triples of positive integers (a,b,c) with 1¡Üa,b,c¡Ü5 are there such that ax^2+bx+c has a rational solution?

asked by Don on February 28, 2013
15. ## Chemistry

Determine the pH of a 0.45M solution of Na2SO3 where Ka1 = 1.5 x 10^(-2) and Ka2 = 6.3 x 10^(-8).

asked by Sarah on March 12, 2018
16. ## calculus

find the general solution to the differential equation. dy/dx=secxtanx-e^x

asked by Anonymous on February 25, 2011
17. ## chemistry

Calculate pH for strong base solution: 15.0 mL of 1.20×10^−2 M Ca(OH)2 diluted to 460.0 mL

asked by jeff on February 26, 2012
18. ## Maths

How many ordered triples of positive integers (a,b,c) with 1

asked by Don on March 1, 2013
19. ## chemistry

how many grams of CuSO4.5H2O is needed to prepare 0.01 M solution?

asked by Anonymous on March 4, 2015
20. ## chemistry

describe how you can crystallize potassium nitrate from its aqueous solution

asked by ziki on April 30, 2011
21. ## Chemistry

A solution has 140 grams of KOH dissovled in 5 L of water. What is the pH ?

asked by Emma on February 26, 2014
22. ## Chemistry

in any aqueous solution what effect does the addition of NaOH (aq) have on the concentration of H+ (aq)

asked by Lisa on June 6, 2012
23. ## Chemistry

What is the pH of a buffer solution that is 0.20M methylamine and 0.15 M methylammonium chloride. which do i get the pH of

asked by LT on April 2, 2008
24. ## Chemistry

I am 100 mL of a 0.5 M HCl solution,and i want to dilute it to exactly 0.1 M. How much water should i add?

asked by Ethio on October 30, 2011
25. ## Chemistry

You have a 2.0 M solution of HNO3. To what volume in mL would you dilute 500.0 mL to achieve a pH of 4.00?

asked by Paige on February 5, 2018
26. ## Natural science

What happens to the level of the salt solution in the distilling flask ? Explain why this happens

asked by Phumelele on April 23, 2016
27. ## math

find the linear differential equation that has y=5-x+2e^xsin3x as a particular solution

asked by toby on July 21, 2015
28. ## Chem help

Calculate the pH of a solution containing 0.00001 moles of H3O per liter.

asked by Lindsey on November 16, 2012
29. ## chemistry

A solution made from 19.0 g of NaBr and 500 mL of water has what molarity?

asked by Cindi on May 4, 2011
30. ## chemistry

why we add acid to the standardization of sodium thiosulphate solution?

asked by aiman on January 2, 2016
31. ## Chemistry

A 0.035 M solution of a weak base has a pH of 10.88. What is the Kb for the acid? Where Di I even begun**???

asked by L.Bianchessi on March 5, 2012
32. ## chemistry

How many milliliter of 2.5 M NaOH are neededto neutralize 2.7 ml of a 4.9 M H2SO4 solution?

asked by kelli on April 29, 2014
33. ## chemistry

I need 2.5ml of 10% aqueous sodium hydroxide solution. How do I make it?

asked by Anonymous on January 8, 2018
34. ## Chemistry

Calculate pH of a solution that is 0.255M in CH3NH2 and 0.105M in CH3NH3Br

asked by Gabby on March 6, 2015
35. ## chemistry

What mass of HCL is present in 0.80 molar, 2500mL solution?

asked by Anonymous on October 6, 2014
36. ## Math

Find all solution of the trigonometric equation 3cosθ-√3=0 for θ in degrees.

asked by Daisy on December 4, 2012
37. ## history

Evaluate the effectiveness of nixon's solution. was it successful? how do you determine this?

asked by aria on May 12, 2016
38. ## Chemistry

What volume of .225 M aluminum chloride solution contains 5.0 g solute?

asked by Susan on March 12, 2015
39. ## chemistry

at 25 celcius, how many dissociated OH ions are there in 8.0x10^-1 L of aqueous solution with pH 4.73?

asked by Christine on November 16, 2015
40. ## Math

Find all real solution of the equation sin^2x = -2+2cosx

asked by Daisy on December 4, 2012
41. ## Math

1. Which of the following ordered pairs is a solution of the equation y=4x^2? (1 point) A. (-2, 16) ***My answer*** B. (1, -8) C. (0, -4) D. (2, -16)

asked by Rylan on March 4, 2019
42. ## Chemistry

Calculate the molar solubility of Cr(OH)3 in a solution with a PH of 11.6 knowing that the Ksp(Cr(OH)3)=6.7×10^-31.

asked by Last on March 25, 2019
43. ## chemistry

How many moles of glucose would be present in: 1Litre of a 5micromolar solution?

asked by Christina on December 3, 2012
44. ## physics

in electrolysis how is conductivity affected by the molecular mass of the solution

asked by physics123 on February 20, 2012
45. ## Chemistry

What is the freezing point of a 10% (by mass) solution of CH3OH in water?

asked by Cielo on December 31, 2014
46. ## Algebra

Write the solution in interval notation x=-2. ) What would the compound inequality look like? Thanks for the help!

asked by Ann on June 9, 2011
47. ## Chemistry

Calculate the pH of a 0.250M solution of Sulfurous acid, H2SO3.

asked by Josh on February 18, 2011
48. ## Chemistry

Explain what would happen if a saturated solution of kno3 at 50°c is heated

asked by Miya pierre on November 16, 2015
49. ## Math- Graphing (check answer)

Determine which ordered pair is a solution of y= -5x + 10. A. (-15,5) B. (2,0) C. (-1, -5) D. (3, 25) My answer is A. Am I correct?

asked by on March 28, 2017
50. ## biochemistry

What mass of CH3COONa must be added to 50.0 mL of 0.50 M CH3COOH to make a solution of pH 6.0 ?

asked by nurul on March 9, 2015
51. ## Chemistry

Determine the concentration of a dioxin solution whose percent absorbance is 0.40%

asked by Stacey on March 31, 2010
52. ## AP Chem

Determine the [H3O^+] of a 0.240 M solution of formic acid.

asked by Eddie on March 21, 2010
53. ## chemistry

what mass of K2SO4 would you measure out to prepare 550 mL of a 0.76 M solution?

asked by becca on February 7, 2011
54. ## biology lab

how many grams of mercury II Nitrate will you need to prepare 500mL of a .60 M solution ?

asked by nicole on February 24, 2017
55. ## Algebra 1

systems of equations with different slopes and different y-intercepts have more than one solution Always sometimes Never I believe it is Never or sometimes I am leaning towards Never

asked by A User on November 19, 2015
56. ## chemistry

How many grams of SrCl2 is required to prepare 1 molar solution of it,

asked by anitha on December 29, 2015
57. ## chemistry

Determine the molarity of a 2.15-L aqueous solution containing 1.45 moles of KCl.

asked by Anonymous on November 15, 2011
58. ## chemistry

Why do we use a boiling solution when carrying out oxidation- reduction titration?

asked by sylvia on January 12, 2009
59. ## Chemistry

What would be the molality of a solution made up of 75cm^3 of water and 0.21 g of NaCl?

asked by Alice on February 19, 2009
60. ## chemistry

How would you prepare a supersaturated solution of CuSo4 in 100ml of water

asked by Jen on November 24, 2012
61. ## Chemestry

Find the molarity of a solution containing 0.75 mol of NaCl with a volume of 1.5 L.

asked by Becky on November 23, 2012
62. ## character education

Which of the following characterizes an equitable solution to conflict? one side gets everything he or she wants nobody gets what he or she wants each person gets something; nobody gets everything C?

asked by Bri on December 1, 2017
63. ## Science

Calculate the hydroxide ion of a solution of almond extracted of PH 3.8

asked by Debora on June 6, 2014
64. ## Chemistry

Determine the pH of a solution after 20.00 mL of 0.4963 M HI has been titrated with 12.64 mL of 0.5174 M NaOH.

asked by Sarah on March 17, 2017
65. ## chemistry

0.30M nh3 and 0.20M HCL calculate the ph of solution kb=1.8 × 10^-5

asked by kanks on March 2, 2013
66. ## college

to how much water should 50.0 ml of 12.0 M HCl acid to be added to produce a 4.00 M solution?

asked by vik on March 18, 2010
67. ## Math

Write three fractions that can be written as percents between 50% and 75%. Justify your solution Can you please help me????

asked by Jenna on September 28, 2016
68. ## math

Which of the following ordered pairs is a solution of the equation y=-4x^2 I REEEEEEEALLY need help I don't get it.

asked by bob on February 25, 2019
69. ## chemistry

what are the solvent and solute in a solution containing 100g of ethanol and 3g of sucrose?

asked by Carla on December 12, 2010
70. ## Chemistry

How many moles of methanol are dissolved in 1.5 L of water to make a 2.0 m solution?

asked by Bigfoot on May 18, 2012
71. ## chemistry

Calculate the grams of Ca(OH)2 used to make 500 mL of a 0.150 M solution.

asked by gab on April 30, 2018
72. ## Chemistry

You need to make 500mls of a 7percent bovine serum solution

asked by Nisha on October 20, 2014
73. ## chemistry

describe a prepare a 0.25 L.0.5 mol standart solution of NaoH

asked by bihah bi on August 6, 2012
74. ## chemistry

As AgNO3 dissolves, what change occurs in the temperature of the solution?

asked by Anonymous on February 13, 2011
75. ## math

The function y_p(t) =ln(4 + 2 t), t > -4/2, is a particular solution to the differential equation y''+8y=g(t). Find g(t).

asked by diego on October 13, 2014
76. ## gen chemistry

calculate the percent m/v concentration of a 5L solution containing 500g NaCl

asked by ashia3 on May 18, 2012
77. ## Chemistry

What is the pH when 3.46 mL of 2.37 M KOH is added to 26.9 mL of a 1.78 M solution of formic acid (HCOOH)?

asked by sarah on February 24, 2011
78. ## chemistry

what is the volume of a 3.00M solution made with 122g of LiF

asked by mia on February 20, 2013
79. ## Chemistry

How can I determine the H3O+ concentration of 0.50 M HCHO2 if I don't have the Ph of the solution?

asked by Er on February 7, 2018
80. ## Chemistry105

How many grams of NaCI are therein exactely 25.00 mL of a 0.1053 M solution of the salt?

asked by Kevin on November 25, 2012
81. ## Chemistry

How many grams of NaF are needed to make 50 mL of a 2% aqueous solution?

asked by Angel Hernandez on April 14, 2015
82. ## Chemistry

How many mL of 0.5 M HCl(aq) are needed to neutralize a 288 mL solution of 0.25 M NaOH?

asked by Anonymous on January 11, 2015
83. ## Chemistry

What is the purpose of adding distilled water to an HCl solution?

asked by Lei on October 6, 2013
84. ## Math

Write a multiplication equation with one variable and one fraction that has the solution 8.

asked by BOI on February 7, 2018
85. ## chemistry

What is the pH of the solution created by combining 2.20 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)?

asked by bme1 on April 17, 2010
86. ## chemistry

What is the final volume in milliliters when 0.700L of a 46.9% (m/v) solution is diluted to 20.1% (m/v)?

asked by nancy on October 16, 2013
87. ## chemistry

The solubility of AB(s) in a 1.000-M solution of C(aq) is found to be 0.121 M. What is the Ksp of AB?

asked by help please on May 7, 2014
88. ## Chemistry

How many grams of perchloric acid are dissolved into 3.86 L of water, if the pH of the solution is 4.03.

asked by Jose on May 11, 2016
89. ## Science

How to find the volume of the solvent that is added to a diluted solution.

asked by Andreah on August 22, 2015
90. ## Math

1÷5 (45y+20)+3÷4 (12y=24)=19 Find solution set (9y=14)+(9y=18)=19 18y = 33÷8

asked by Sue on July 17, 2015
91. ## Chemistry

Which solution has the higher osmotic pressure, 2 M NaCl or 2 M CaCl2?

asked by Joe on July 27, 2010
92. ## school math 3rd grader

how to find solution to subtraction problem without doing any calculation. explain?

asked by tom on November 18, 2015
93. ## Chemistry

How do I make 500ml of a 0.3% chlorine dioxide solution from 6.4% tablets?

asked by Pam on March 31, 2016
94. ## chemistry

What is the solubility of CaF2 in a buffer solution containing .30 M HCHO2 and .20 M NaCHO2?

asked by Kelley on April 4, 2010
95. ## Chemistry

Determine the pH of a solution after 20.00 mL of 0.4963 M HI has been titrated with 12.64 mL of 0.5174 M NaOH.

asked by Sarah on March 16, 2017
96. ## chem 150

calculate the molarity of 700grams of NaOH in 2 liters of solution

asked by nick on June 22, 2011
97. ## chemistry

determine the concentration of Fe2+ ion the prepared solution

asked by methove on August 2, 2012
98. ## Biology- PLEASE HELP ME ):

how does the salinity of a solution affect osmosis in an onion cell?

asked by Kasey on March 1, 2011
99. ## chemistry

Calculate the molarity of a 295 mL solution contain 45 g of ethanol (C2H5OH)

asked by jane on November 27, 2011
100. ## Chemistry

3.50 g of NH4Cl is added to 18.8 g of water. Calculate the molality of the solution.

asked by Shardai on October 16, 2013