# 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 402-
## chemistry

What is the molarity (M) of a 627 mL solution that contains 12.7 g of ethanol, CH3CH2OH?

*asked by Kara on October 12, 2011* -
## Chemistry

What is the pH of a 0.05 M solution of acetic acid knowing that it was 2% ionized

*asked by Sidney on May 28, 2016* -
## maths-I only need the solution

x+y+√z=148 x+√y+z=82 √x+y+z=98 find x,y,z given that x,y,z are all positive integers. Please i need the solution #thanks

*asked by P1 on April 21, 2016* -
## Analytical Chemistry

principles behind the dilution and aliquoting of the NaOH solution

*asked by Charie on September 13, 2014* -
## Algebra

Which ordered pair is a solution of the equation y=x-3? (-2,5) (-5,2) (2,5) (5,2) I keep getting other answers :(

*asked by Mari on June 6, 2016* -
## Chemistry

How many g of sodium nitrate do I need to make one Liter of 15% m/v solution?

*asked by Monica on October 10, 2010* -
## chemistry

Determine the pH of a 1 M aniline solution (Kb = 4.2 10-10). I am unsure how to start, any help?

*asked by Logan on November 13, 2015* -
## Chemistry

What is the pH of a 0.001 M formic acid solution? Ka = 1.8 x 10^-4. I don't know what to do!

*asked by Jakob on May 29, 2010* -
## calculus

find the solution of the initial value problem y'=xye^x; y(1)=1

*asked by Anonymous on April 10, 2012* -
## pre-calc

is x=15 degrees a solution of radical 3/3 cos2x+sin2x=0

*asked by larry on November 13, 2007* -
## chemistry

How many moles of KBr are there in 35.8ml of a 0.172M solution?

*asked by twynna on February 9, 2011* -
## chemistry

what is a standard solution? and what is a function of an indicator in a titration?

*asked by Nancy on March 5, 2011* -
## chemistry

What is the pH of a 2.23 M HCHO2, formic acid, aqueous solution at 25 °C? ( Ka = 1.8E-4 )

*asked by matt on March 4, 2011* -
## Chemistry

What is the molar solubility of Fe(OH)3(s) in a solution that is buffered at pH 2.75? The Ksp of Fe(OH)3 is 6.3 × 10-38.

*asked by Sarah on March 5, 2011* -
## math help pls pls

Systems of equations with different slopes and different y-intercepts have more than one solution. Always Sometimes Never

*asked by Oscar on December 2, 2015* -
## Chemistry

How many equivalents are in 1.75L of a 8.2M solution of sulfuric acid.

*asked by Sam on January 22, 2013* -
## eng1511

an essay:the sure solution to unemployment is a better quality of education

*asked by thandeka jaca on April 6, 2013* -
## math

Use the intermediate value theorem to verity that x^4+X-3=0 has a solution in the interval(1,2)

*asked by Anonymous on October 10, 2010* -
## MATH

Perform the operation for each equation, if there is a solution (Matrices) [4k -8y ] [5k+6y 2k+1] [6z - 3x] - [2z+5x z+4] [2k + 5a] [4k+6a 3a+2]

*asked by Daria on December 1, 2010* -
## ap chemistry

Calculate the ratio of [NH3]/[NH4+] that gives a solution of pH = 10.60.

*asked by gabriella on February 4, 2014* -
## algebra

explain how you would know if your answer will be a solution or rational expression

*asked by karon on December 14, 2011* -
## Chemistry

What is the molar solubility of Fe(OH)3(s) in a solution that is buffered at pH 2.75? The Ksp of Fe(OH)3 is 6.3 × 10-38.

*asked by Sarah on March 5, 2011* -
## Scientific Notation

What is the solution to (3 x 10^2) x (5 x 10^5), written in scientific notation? a. 1.5 x 10^8 b. 15 x 10^8 c. 1.5 x 10^7 d. 15 x 10^7 ***?? Thank you for the one last time. I appreciate it. :)

*asked by Prim on November 9, 2016* -
## Chemistry

How many grams of NaCl will you need to mix 200ml of a 2.3M solution?

*asked by Dennese on June 2, 2015* -
## calculus

Find the general solution of the equation. 6t*dy/dt+y=sqrt (t),t>0.

*asked by rebekah on June 27, 2016* -
## Math

Does the term "one real solution" and "one root" mean the same thing

*asked by Anonymous on February 7, 2017* -
## math

4-(-3)+1/2-2/(-2) am having trouble with this problem. I got a 8.5 decimal are a fration of 8 1/2 am I right? are how do i come up with the solution

*asked by cynthia on September 24, 2010* -
## chemistry

what is the pH of an 0.155M aqueous solution of acetic acid if the Ka is 1.8 EE -5?

*asked by Anonymous on December 1, 2010* -
## chemistry

A scientist has 0.46 mL of a solution. How would she convert this volume to microliters?

*asked by Sally on August 3, 2009* -
## math

which is the solution for x in terms of the variables in the equation x/y -z = rw a) x=y (z+rw) b) x= z/y (rw) c) x= rw+yz d) x= y+1/2(rwz)

*asked by Anonymous on January 18, 2011* -
## chem

how many ml of 0.15 m naoh solution are required to neutralize 35.00 ml of 0.22 m hcl

*asked by Anonymous on April 23, 2010* -
## Math

Graph the solution set for the of linear inequalities. x−y≤4 x+3y≤4 x≥−5

*asked by Keonn'a on October 18, 2018* -
## chem

In 100. mL solution contain 5.0 mL of solute and 95 mL of a water. The concentration is

*asked by Anonymous on October 17, 2012* -
## Biology

You have been asked to make 200ml of 50% detergent solution (v/v). How would you do it?

*asked by Anonymous on January 19, 2015* -
## Science

What is the concentration of NH3 in 0.250M solution of NH4Cl?

*asked by Jeet shah on March 31, 2015* -
## Chemistry

How many grams of sodium hydroxide are dissolved in 0.02 of a 3.0 m solution?

*asked by Sam on July 13, 2010* -
## Chemistry

What concentration of of CN- is needed to produce the same POH as 3.5*10^-5M solution of BA(OH)2?

*asked by Molly on March 2, 2015* -
## chemistry

For the strong acid solution 9.7×10−3 , determine (H3o+)and (OH-)

*asked by Jessica on May 2, 2012* -
## science

Balance in acid solution PH3+ I2-> H3PO4+ I-

*asked by Joseph on September 6, 2010* -
## chem

What is the pH of a 0.36 M HCl solution? can someone help plz? I don't know how to go about figuring this out.

*asked by Gulzaman on August 24, 2007* -
## Chemistry

Calculate the pH of a solution that is 2.00 M HF, 1.00 M NaOH, and 0.704 M NaF. (Ka = 7.2 E -4)

*asked by Schanee on December 17, 2008* -
## Chemistry-Dr.Bob222

Determine [OH-] of a solution that is 0.135 M in CO3^2-. I got 0.00532.

*asked by Nevaeh on April 4, 2016* -
## chemistry

what are the reasons why the Cu(II) solution has to be titrated immediately after addition of KI?

*asked by irma on January 31, 2008* -
## ENG1511

an essay: of The sure solution to unemployment is a better quality of education?

*asked by godfrey on February 28, 2013* -
## Math DE

Find the general solution of the differential equation dy/dx-4y= -5y^2

*asked by Cam on August 3, 2014* -
## Chemistry

What concentration of of CN- is needed to produce the same POH as 3.5*10^-5M solution of BA(OH)2?

*asked by Molly on March 2, 2015* -
## chemistry

find the concentrations of Ca^2+ and F^- in a saturated solution of CaF_2_

*asked by holly on March 9, 2013* -
## math

which is the solution for x in terms of the variables in the equation x/y -z = rw a)x=y (z+rw) b)x=z/y (rw) c)x=rw+yz d)x=y+1/2(ryz)

*asked by Anonymous on January 18, 2011* -
## Science

How should the solution of the (Fe(H2O)5(SCN)2+ complex be disposed of?

*asked by Okafor on September 15, 2014* -
## Chemistry

How many grams of sodium hydroxide are dissolved in 0.02 of a 3.0 m solution?

*asked by Sam on July 13, 2010* -
## chemistry

For the strong acid solution 9.7×10−3 , determine (H3o+)and (OH-)

*asked by Jessica on May 2, 2012* -
## chemistry

calculate the concentration of ammonium nitrate solution.

*asked by Anonymous on August 17, 2014* -
## chemistery

in a solution of pH of 3.26, the molar concentration of the hydronium ion is ?

*asked by ogb on December 9, 2012* -
## chemistry

What is the molarity (M) of a 627 mL solution that contains 12.7 g of ethanol, CH3CH2OH?

*asked by Kara on October 12, 2011* -
## Chem

what is the pOH of a 0.12 M solution of pyridine (Kb=1.4x10^-9) at 25 Celsius

*asked by C on March 19, 2013* -
## chemistry

What is the molarity (M) of a 627 mL solution that contains 12.7 g of ethanol, CH3CH2OH?

*asked by Kara on October 12, 2011* -
## chemistry

What is the molarity (M) of a 627 mL solution that contains 12.7 g of ethanol, CH3CH2OH?

*asked by Kara on October 12, 2011* -
## chemistry

How many moles of KBr are there in 35.8ml of a 0.172M solution?

*asked by twynna on February 9, 2011* -
## Pre - Algebra

(4x^2-2x-1)-(-3x^3+2) I already know the answer is 3x^3+4x^2-2x-3 but I need someone to explain how to get to the solution. It would be greatly appreciated.

*asked by EJ on June 5, 2018* -
## chemistry

How does the saturation of a solution affect crystal formation?

*asked by PLEASE help on September 14, 2017* -
## Chemistry

Calculate the molarity of 15.4 g of ethanol (C12H22O11) in 71.0 mL of solution

*asked by Kiana on February 27, 2011* -
## chemistry

if i want to change the pH of any solution from 5 to 8 what the volume of NaOH 0.1 N needed

*asked by mohamed on March 9, 2011* -
## Chemistry

How many equivalents are in 1.75L of a 8.2M solution of sulfuric acid.

*asked by Sam on January 22, 2013* -
## Chemistry

What volume of 0.100 M K2S solution contains 3.5 g of the solute?

*asked by Page on November 20, 2018* -
## Algebra 2

Find the exact solutions of x^2 - (y - 12)^2 = 144 and y = -x^2. No solution?

*asked by Lily on May 18, 2013* -
## adult education

How many grams of KOH would be necessary to make 200 mL of a 0.15 M solution?

*asked by debbie on April 23, 2010* -
## math

How many milliliters of 0.4N NaOH can be made from 20ml of 2N solution

*asked by Tee on October 5, 2013* -
## chemistry

illustrate how to prepare a 1:3 solution of 0.5 hydrochloric acid

*asked by Priscilla on December 4, 2016* -
## math equation

determine whether -4 is a solution of the inequality x is greater than or equal to 4

*asked by Lavern on December 3, 2011* -
## chemistry

How many moles are there in 250cm3 0f 4M sodium chloride solution

*asked by Gary on October 16, 2010* -
## science

Why the solution of aluminium sulphate in water is not clear

*asked by nidhi on January 1, 2017* -
## chemistry

If 5.0g of Sodium Chloride in 250 mL of solution, what is the percent?

*asked by meg on April 19, 2010* -
## BioChemistry

how many moles of estradiol (mw = 272) are there in 2 ml of a 100 μm solution

*asked by Alwxy on October 22, 2016* -
## algebra

evaluate and leave the solution in scientific notation: (2 x 10^4)(5.1 X 10^2)

*asked by tracy on October 19, 2011* -
## Chemistry

What is the hydroxide ion concentration in a solution with [H3O-] = 7.67 x 10^-9M

*asked by Anonymous on March 11, 2010* -
## College Algebra

3x^4=648x someone help please im so confused. i am trying to find the solution set?

*asked by Adrianna on February 1, 2013* -
## Science

Describe how you would prepare 25.0ml of a 1.00 M NaOH solution.

*asked by Sandy on February 27, 2013* -
## science

Why the solution of aluminium sulphate in water is not clear

*asked by jerry on January 1, 2017* -
## Chemistry

The boiling point of a solution or mixture is always ________?

*asked by Ruffles on December 5, 2013* -
## Chemistry

How would you precipitate BaCrO4 from a solution of Ba(NO3)2 and K2CrO7?

*asked by Amy on March 9, 2014* -
## Trig

Verify that 7pi/6 is a solution to 2sin2x–sinx=1.

*asked by Tabitha on January 20, 2011* -
## DIFFERENTIAL EQUATION

find the general solution .. Y=Asin4x+Bcos4x+x

*asked by JAJA111111 on June 16, 2012* -
## Chem

Assuming complete dissocaition, what is the pH of 4.93 mg/L BaOH2 solution

*asked by Helena on February 21, 2014* -
## Chemistry

In an aqueous solution the [OH–] is 2.0 x 10–6 M. What is the [H3O+]? Question 17 options: 1.0 x 10–7 M 2.0 x 10–6 M 1.0 x 10–8 M 5.0 x 10–9M

*asked by Tamera on November 17, 2014* -
## algebra

Graph the solution of each linear inequality. y

*asked by janet on December 22, 2009* -
## chemistry

you are right....I wrote it wrong. Does this mean that the solution will be more toward the redish side?

*asked by George on July 18, 2010* -
## maths

give the solution of the initial-value problem dy/dx=(1+2cos^2(x))/y, (y > 0), y= 1 when x = 0. Thanks.

*asked by olek on May 13, 2011* -
## physical science

What is the pH of a 0.01 M solution of the strong acid HNO3 in water?

*asked by breiann on January 23, 2012* -
## chemistry

Calculate the pH after 0.15 mol of NaOH is added to 1.00 L of the solution that is 0.50 M HF and 1.01 M KF

*asked by kyle on March 25, 2011* -
## algebra

How big is the solution set for an equation that cannot be solved

*asked by Justin on September 9, 2010* -
## maths

give the solution of the initial-value problem dx/dy=(1+2cos^2(x))/y, (y > 0), y= 1 when x = 0. Thanks.

*asked by olek on May 12, 2011* -
## science

What is the pH of the solution created by combining 11.20 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)?

*asked by sara on May 5, 2008* -
## Jkr public school

mole fraction of solute is 0.4 what is molality of solution

*asked by Manish on July 22, 2015* -
## mathematics-abstract equations

x+y+√z=148 x+√y+z=82 √x+y+z=98 find x,y,z given that x,y,z are all positive integers. Please i need the solution #thanks

*asked by P1 on April 20, 2016* -
## chem class

What is the concentration (in M) of hydroxide ions in a solution at 25°C with pH = 4.282?

*asked by ben on November 23, 2010* -
## math

3. Determine which ordered pair is a solution of y = –5x + 10. (1 point) (–15, 5) (2, 0)++ (–1, –5) (3, 25)

*asked by dori on March 15, 2019* -
## chemistry

How many milliliters of a 0.50 M solution contain 14.0 g of BaCl2 (Barium Chloride)?

*asked by Emily on September 14, 2010* -
## Math

Determine the solution to the initial value differential equation: y′+2*y^2*e^(5*x)= 0 y(0)=2

*asked by AK on October 21, 2009* -
## chemistry

what is the mass of LiF is needed to produce 2.5 L of a .30 M solution

*asked by Anonymous on April 10, 2013* -
## Chemistry 2

What is the molarity of 50.0 mL solution of aluminum sulfite that contains 80.0 g of this salt? (Al=27.0, S=32.0,O=16.0)

*asked by Ivan on March 3, 2014*

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