1. Precalculus

    I know I posted this already but.. I don't understand what exactly is the answer, since the answer key shows the intersection of the circle and hyperbole at (-5,0) What about (7.5,0)???? By the way the graph has one intersection point... How do you know

    asked by Anonymous on May 24, 2014
  2. Precalculus...repost.. The tutor didn't quite answ

    Calculate the solution set. x^2+y^2+8x=-15 9x^2+25y^2=225 My work: I did elimination...multiplied -25 to the top equation and got..... -16x^2-200x-600...I then used quadratic formula ... And got -7.5 and -5..... Is -7.5 an EXTRANEOUS SOLUTION because when

    asked by Anonymous on May 24, 2014
  3. Precalculus

    Calculate the solution set. x^2+y^2+8x=-15 9x^2+25y^2=225 My work: I did elimination...multiplied -25 to the top equation and got..... -16x^2-200x-600...I then used quadratic formula ... And got -7.5 and -5..... Is -7.5 an EXTRANEOUS SOLUTION because when

    asked by Anonymous on May 24, 2014
  4. Calculus

    Will someone send me the ti 83 steps for: determine the graph of the equation: 9x^2+25y^2+z^2=225 if one is available.

    asked by Pam on April 19, 2008
  5. math

    can someone please help me with this elimination methods problem? 0.05x+0.25y=11 0.15x+0.05y=12 solve using the elimination method and give the ordered pair...

    asked by Kristin on March 13, 2010
  6. Algebra

    Identify the type of conic section that has the equation 9x^2 + 25y^2 =225 and identify its domain and range.

    asked by Anonymous on December 4, 2016
  7. Algebra

    Identify the type of conic section that has the equation 9x^2+ 25y^2 =225 and identify its domain and range.

    asked by Aaron on December 14, 2016
  8. algebra

    I just need a quick check before I hand in my work if you would...Thanks. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1), (-6, 4)…Is this correct?

    asked by S on January 8, 2010
  9. Chemistry

    A few questions I don't really get and need to see the work for A 50.0 mL sample of 0.55 M benzoic acid, C6H5COOH, a weak monoprotic acid, is titrated with 0.51 M NaOH. Calculate the pH at the equivalence point. Ka of C6H5COOH = 6.5 multiplied by 10-5.

    asked by Dubs on April 22, 2010
  10. math

    a line is drawn from the origin to a point on the ellipse 9x^2+25y^2=225.find the equation of the locus of midpoint of the line.

    asked by ekpe on May 12, 2016
  11. Math

    A chemist needs 22 liters of a 14% acid solution. He has a 10​% solution and a 20% solution available to form the mixture. How much of each should be used to form the 14​% ​solution? I'm having a really hard time forming an equation for this. I've

    asked by Robert on October 5, 2016
  12. math

    The equation P=240I-8I^2 represents the power, P, (in watts) of a 240 volt circuit with a resistance of 8 ohms when a current of I amperes is passing through the circuit. Find the maximum power (in watts)that can be delivered in this circuit. I had posted

    asked by Shirley on February 23, 2008
  13. MATH

    Useing substitution/elimination method what is the solution set to 2x+y=1 x^2=y+2 a)(-3,7) and (1,-1) b)(3,7) and (-1,-1) c)(-3,-7) and (1,1) d)(3,-7) and (-1,1) I've really no educated guess so PLEASE HELP! You can make an educated guess by substituting

    asked by Anonymous on January 16, 2007
  14. Algebra SOLVING LINEAR EQUATIONS AND INEQUALITIES

    Please help Im am Grade 5 and my teacher is letting me do this. 1. Solve the solution by using elimination and substitution 3/x - 2/y = 14 6/x + 3/y = 7 2. Solve by eliminating x (this is solving 3 linear equations) then substitute to the other two

    asked by Clyde on April 25, 2016
  15. Algebra 1

    What is the solution set for an equation in which all numbers work? How big is the solution set for an equation that cannot be solved?

    asked by Wendy on October 7, 2009
  16. precalc

    I'm terrible at pre calc, could someone tell me if the solution set for log subscript 2 x + log sub 2 (x-1)=1 is the solution -1? Using either the elimination or substitution method is the solution set for 4x + y =11 and 2x -y = 7 is the answer (3, -1)?

    asked by eragon on January 13, 2007
  17. alg.

    solve the system by addition: -5x-9y = -5 x+5y=-15 I've tried this one over and over, but I can't seem to get the right answer. I don't even really know where to start. each time i try to do it, i go about it a little differently and i'm completely lost,

    asked by j on August 14, 2007
  18. Chem.

    N2+3H2 2NH3, The equilibrium constant for the chemical equation is Kp = 0.143 at 225 °C. Calculate the value of the Kc for the reaction at 225 °C.

    asked by Anonymous!! on March 19, 2014
  19. Algebra II-Please check my solution

    Solve by elimination method-thanks fro checking my work 2x + 3y= 2 multiply this equation by 2= 4x + 6y = 4 4x-2y = -28 4x + 6y = 4 -4x -2y = -28 8y = 32 y = 4 2x + 3(4) = 2 2x + 12 = 2 2x + 2-12 2x = -10 x = -5 solution = (-5,4)

    asked by Joella on February 16, 2011
  20. HELP!

    The problem using elimination/substitution methods what is the solution set to 3x -2y =-4 and 5x=2y the choices a)(2,-5) b)(-2,-5) c)(2,5) d)(-2,5) Please, Please, Please, HELP! 3x-2y=-4 -5x +2y=0 add the equations, solve for x. That makes it a or c. Put

    asked by Anonymous on January 16, 2007
  21. Chemistry

    Calculate the molality of a solution prepared by dissolving 225.5 g KNO3 in 825mL of water. Show your work

    asked by Kayla on June 2, 2016
  22. drawls, math help

    can you explain to me just one more thing so i can undestand it. Now i have an equation which is : 3x = 3x + 5 which I know has no solution to it, now whereas the equation 7x + 8 = 8 has zero as a solution. What is the difference between a solution of zero

    asked by jasmine20 on January 3, 2007
  23. math

    0.05x+0.25y=11 0.15x+0.05y=12 solve using the elimination method

    asked by Kristen on March 13, 2010
  24. math

    solve using the elimination method 0.05x+0.25y=11 0.15x+0.05y=12

    asked by Kristen on March 13, 2010
  25. Chemistry

    A buffer solution contains HC2H3O2 at a concentration of 0.225 M NaC2H3O at a concentration of 0.164 M. The value of Ka for acetic acid is 1.75 × 10-5. Calculate the pH of this solution using the Henderson-Hasselbalch equation. Could you please show

    asked by Chemistry Chick on November 17, 2011
  26. Algebra 2

    Standard form for both equation with steps 16x^2-96x+144+25y^2=400 16x^2+192x+576+25y^2=1600

    asked by Spencer on August 6, 2015
  27. Algebra 2

    Standard form for both equation with steps 16x^2-96x+144+25y^2=400 16x^2+192x+576+25y^2=1600

    asked by Spence on August 23, 2015
  28. A Math Equation...Plz Help...

    |2x + 4| is always larger than or equal to zero. This means that the left hand side of the equation is always 6 or less, so there are no solutions. 6 - 3|2x + 4| = 12 So I just put NO Soution? No solutions, or if you have to write down the solution in the

    asked by Count Iblis on December 2, 2006
  29. college algebra

    1. find the equation of the line with the given properties. Express the equation in general form or slope-intercept form. perpendicular to the line -3x_y= -27; contains the point (9, -1) the equation of the line is ? 2. solve the polynomial inequality and

    asked by confused--two questions please help on December 1, 2012
  30. MATH

    Useing substitution/elimination method what is the solution set to x^2+y^2=25 4x-3y=0 a)(3,4) and (-3,-4) b)(3,-4) and (-3,4) c)(-4,3) and (4,-3) d)(4,3) and (-4,-3) PLEASE HELP! There are two ways to do this. (1) Try each of the multiple choices in the

    asked by Anonymous on January 16, 2007
  31. alGEBRA 2 help please would appreciate

    find the foci of 9x^2-25y^2=225 I get this far a^2=5 and B^2=3 AND I KNOW I HAVE TO USE THE formula c^2=a^2-b^2 i don't know what to do now if add it i get c^2=34 please help show the step thanks

    asked by lisa on October 28, 2013
  32. Substitution Method in Algebra!HELP PLZ!

    Use the Substitution method to solve the system of equations. 3x + y = 5 4x - 7y = -10 multiply first equation by 4 multiply second equation by 3 thus both equations have same x or y value in this case it is the x value. 12x + 4y = 20 12x - 21y = -30 solve

    asked by Matthew on November 5, 2006
  33. math

    Andrew has $2.75 in nickels and quarters in his coat pocket. If he has a total of 15 coins, which system of equations could you use to find the number of quarters in Andrews coat pocket? 1)x+y=15 0.5x+0.25y=2.75 2)x+y=2.75 x+y=15 3)x+y=15 0.05x+ 0.25y=2.75

    asked by B8 on January 11, 2014
  34. CountIblis, can i bother you

    Countiblis, i know that you might be busy do you mind if i ask you the following for help.Only if you can please. can you explain to me just one more thing so i can undestand it. Now i have an equation which is : 3x = 3x + 5 which I know has no solution to

    asked by jasmine20 on January 3, 2007
  35. SCIENCE(PHYSICS)

    A train travels 40 km/hr for 0.2 hr, 50km/hr for next 0.2hr and 60km/hr for next 0.4 hr.calculate the average speed of train. My Solution:-1st hr. distance=40 multiplied by 0.2=8km 2nd hr.= 50 multiplied by 0.2=10km 3rd hr. =60 multiplied by 0.4=24 km

    asked by YASH on May 25, 2011
  36. Chemistry

    Using the standard reduction potentials, calculate the equilibrium constant for each of the following reactions at 298 K. 10Br- + 2MnO4- + 16H+ -> 2Mn2+ + 8H20 + 5Br2 Work: 2Br- -> Br2 + 2e- (This would be multiplied by 5 to balance out with the upper

    asked by Anonymous on December 2, 2009
  37. math,correction

    Directions:Multiply Problem: ((x)/(3)+(3)/(4)) ((3x)/(4)-(3)/(5)) so the answer for it i got: ((20x^2+20x-36)/(80)) I worked it and I have what you have EXCEPT 29x instead of 20x. If you can't find the error, post your work and we can help you find it.

    asked by Jasmine20 on January 24, 2007
  38. Math

    x=-y+3 5x-y=-2 Solve using Elimination I already solved the equation using Substitution, Graphing, and a table I just need a little more help on Elimination. I know that in Elimination they have to be in the same form so I put it in slope intercept which

    asked by M on January 20, 2015
  39. Math check my answers

    1. Evaluate. 8d - 10 for d = 4 A.32 B.22*** C.26 D.46 2. write an algebraic expression for the sum of 3 coins and c coins. A.c + 3*** B.c/3 C.3c D.c-3 3. Find the solution of the equation from the given numbers. x - 2 =16: 14, 18, 21, or 12 A.12 B.14

    asked by Sid.V on December 1, 2016
  40. calculus

    solve the following inequality 15x-16 less than or equal to 15/x is the point x=0 included in the solution set of the inquality? are the other finite pointsa of the interval included in the solution set? what is the solution set? please show work

    asked by Heather on December 27, 2012
  41. Chemistry

    The Ka values of H3PO4 are shown below. Ka1 7.5 multiplied by 10-3 Ka2 6.2 multiplied by 10-8 Ka3 4.8 multiplied by 10-13 What is the pH of a 0.14 M solution of Na2HPO4?

    asked by George on April 3, 2011
  42. Algebra

    solve by elimination: 6a+2b = -48 -6a+b = 57 What is the solution set ( , )?

    asked by Richard on October 11, 2012
  43. help with solving

    x^2+(x-2)^2 = (2x-6)^2 solve for x. thanks so much. Please keep in mind that tutors here won't simply do your work for you. I'm sure you'll get a better response if you show your work as far as you can get, so tutors will know where you get stuck. =) it

    asked by q on August 3, 2007
  44. Algebra 116

    1. Solve using the Elimination Method. 2r - 7s = -57 7r %2B 2s = 39 What is the solution set ______? 2. Simplify -8[-90-(-60-14)]= ______ 3. Solve using the Substition Method. 5x %2B 7y = 41 x = 61 - 8y What is the solution _______? 4. On three consecutive

    asked by MzMaria on September 30, 2008
  45. calculus

    Please help with this question. I have a general solution to a differential equation of 18y^3/2= TOP LINE OF FRACTION is 2(x^2-6x+23)^3/2 and this is divided by 3.plus Constant .I work out constant c to be zero. Is this correct? What is the particular

    asked by Tony on May 11, 2011
  46. Chemistry

    This is a question I am presently doing right now which I found in my homework. I am quite sure that in (a) I have to use the Hasselbach equation though I am not sure how to work it out. If anyone knows any of the answers, and how you got to them, please

    asked by Matthias on September 29, 2012
  47. Chemistry

    This is a question I am presently doing right now which I found in my homework. I am quite sure that in (a) I have to use the Hasselbach equation though I am not sure how to work it out. If anyone knows any of the answers, and how you got to them, please

    asked by Matthias on September 29, 2012
  48. Algebra

    I am solving for sytems of equations using the elimination method. Book says answers are 0,-1. I have tried solving for both x & y using both the 5 and 25 . I am not getting the 0,1 as my answer. 5x-5y=5 25x-25y=22

    asked by G on April 1, 2008
  49. math

    Ex 2: -2x+7=22 -2x+7-7=22-7 -2x=15 -2x/(-2)=15/(-2) I do not have to switch the equality sign. Even if I did it would not look any different. x=-7.5 Check: -2x+7=22 -2(-7.5)+7=22 my solution is that x=-7.5 so I will just put that in to see if it works.

    asked by Anonymous on September 22, 2010
  50. chemistry

    A solution was prepared by dissolving 43.0 of in 225 of water. Calculate the mass percent of in the solution.

    asked by help on October 1, 2010
  51. mathes for management

    Use gauss Jordan elimination method to find solution set of 4x+5y+3z=23 3x+2y+z=10 2x+5y-z=9

    asked by legesse on December 13, 2016
  52. Algebra

    Solve the following system of linear equations: 2x - 3y + 6z = -12 5x + 2y - 8z = 29 7x + 6y + 4z = 49 First, I did elimination for the first two equations. I multiplied the first equation by two, and the second equation by 3. 4x - 6y + 12z = -24 + 15x +

    asked by Anneliese on February 25, 2009
  53. Intermediate Algebra

    Solve using the elimination method.Show work.If system has no solution state this or infinite solution 8x+10y=-34 16x-5y=-43

    asked by sherry on March 27, 2012
  54. math

    Once you have created both sets of numbers, complete the following tasks. In each task, make sure to clearly label which set you are identifying or describing. Identify the elements of each set that you created. Calculate the mean of each set. Show your

    asked by Layla on May 11, 2019
  55. chemisty problem help

    Carbon-12 contains 6 protons and 6 neutrons. The radius of the nucleus is approximately 70 pm. Calculate the volume of the nucleus and the volume of the atom. What percentage of the carbon atom's volume is occupied by the nucleus? Can someone tell me how

    asked by Tagen on February 8, 2007
  56. ChemB

    CALCULATE PH OF THE SOLUTION THAT RESULTS FROM EACH SOLUTION A) 150.0mL OF 0.25M HF WITH 225.0 mL OF 0.30M NaF Help please, these buffer questions are confusing.

    asked by ALISON on March 12, 2012
  57. Algebra

    Solve using the elimination method.Show work.If the system has no solution or an infinite number of solution state ths...-5x+4y=-16,-15x+2y=-58

    asked by sherry on March 22, 2012
  58. HELP!

    The problem using elimination/substitution methods what is the solution set to 3x -2y =-4 and 5x=2y the choices a)(2,-5) b)(-2,-5) c)(2,5) d)(-2,5) Please, Please, Please, HELP! Between a and c I believe it is c is that correct? Yes.

    asked by Anonymous on January 16, 2007
  59. math

    use gauss jordan elimination method tofind solution set of4x+5y+3z=23.3x+2y+z=10.2x+5y-z=9

    asked by Anonymous on June 6, 2018
  60. math

    use gauss jordan elimination method tofind solution set of4x+5y+3z=23.3x+2y+z=10.2x+5y-z=9

    asked by Anonymous on June 6, 2018
  61. Intermediate Algebra (Math)

    HELP PLEASE, Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. -2x Ð 8y = 22 -6x Ð y = 20 At first I tried to multiply by 8 but that did not work.

    asked by Lyri on October 11, 2010
  62. Pre-Calculus Matrix

    Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. Show your work. 4x - y + 3z = 12 x + 4y + 6z = -32 5x + 3y + 9z = 20 4 -1 3 12 1 4 6 -32 5 3 9 20 I believe that the solution does not exist and

    asked by Alexa on June 8, 2016
  63. Chem

    Calculate the concentration of NH4+ from ammonium chloride required to prevent the precipitation of Ca(OH)2 in a liter of solution that contains .10 mol of ammonia ans .10 mol pf calcium ion. I got the two equations but I do not know where to begin. The

    asked by Anonymous on May 7, 2007
  64. Math

    Please help!!!! Solve each system graphically. Be sure to check your solution. If a system has an infinite number of solutions, use set-builder notation to write the solution set. If a system has no solution, state this. 6x - 2y = 2, 9x - 3y = 1 My answer:

    asked by Jordyn on October 11, 2010
  65. physics

    A granite column in a building is 8.50 m high and has a mass of 2.16 multiplied by 104 kg. (a) How much heat (J) is needed to increase its temperature by 10.5°C, given its specific heat is 0.200 kcal/kg·°C? (b) What is its change in length (m) if its

    asked by Alice on July 24, 2013
  66. math

    (6x-5y)^2= 36x-25y 6x-5y (4x+5y)^2 16x+25y 4x+5y Please check to see if right. If not corrected for me.

    asked by Elaine on June 2, 2010
  67. Chemistry

    Calculate the initial molarity of KNH2 and the molarities of K+, NH3, OH-, and H3O+ in an aqueous solution that contains 0.75 g of KNH2 in 0.255 L of solution. You may ignore the reaction of NH3 with water. I already found the initial molarity, but I am

    asked by Trixie on February 23, 2010
  68. math elimination method

    elimination method really confuses me. solve by elimination method 5r -3s = 17 3r + 5s =17 A. solution is ______ (ordered pair, integer or fraction) B. Infinitely many C. No Solution

    asked by Lorri on July 9, 2010
  69. Math Please Help me!!!

    3x^2+17x+10 *You have to factor completley but I don't know how too.Please help.! (3x+2 )(x + 5) Factoring asks this question: what two factors of 10 add to 17 when one is multiplied by three? Here is how you factor. Place two sets of parentheses. ( ) ( )

    asked by margie on January 24, 2007
  70. Algebra

    Could someone tell me what I am doing right or wrong? Problem Two: 5/9 + (2/9)x = 25/7 + (6/7)x – 2/3 Like signs are not collected at the beginning. This would make the equation unequal. To make both sides equal we first multiply all sides by nine and

    asked by Aria on April 29, 2011
  71. algebra help me please

    The equation below shows the area of a trapezoid, A, with a height of 9 cm, and one base 35 cm. A = 9 over 2(b + 35) Which of the following formulas correctly solves for the other base, b? b = 2A over 9 + 35 b = 2 multiplied by A over 9 − 35 b = 2

    asked by oscar on September 7, 2015
  72. Algebra

    3x+4y=12 solve for solution (0.)(.3/4) (,0) (8/3,) You are given the equation, and the x,y set. Iwill be happy to critique your work. Here is one as an example: 3x+4y=12 solve for solution (.3/4) 3x + 4(3/4)=12 3x + 3=12 3x=9 x=3

    asked by Paula on September 16, 2006
  73. Algebra 116

    I need help with these algebra problems please. 1.Solve by using the substitution method. a. 8x - 3y =-61 7x + 68 = y What is the solution system _____? b. 4m + n =27 m - 2n = 9 What is the solution system_______? c. 8x + 9y = -15 -6x + y = 19 What is the

    asked by MzMaria on September 16, 2008
  74. college physics

    An aluminum cup contains 225 g of water and a 40-g copper stirrer, all at 27°C. A 400-g sample of silver at an initial temperature of 87°C is placed in the water. The stirrer is used to stir the mixture gently until it reaches its final equilibrium

    asked by cat on December 3, 2012
  75. Math/Check

    I have a few problems I need you to take a look at and tell me if I arrived at the right answer. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1), (-6,

    asked by S on January 7, 2010
  76. Algebra

    I have a few problems I need you to take a look at and tell me if I arrived at the right answer. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1), (-6,

    asked by Shane on January 6, 2010
  77. Algebra/math

    I have a few problems I need you to take a look at and tell me if I arrived at the right answer. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1), (-6,

    asked by shane on January 6, 2010
  78. Algebra/no response yesterday

    I have a few problems I need you to take a look at and tell me if I arrived at the right answer. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1), (-6,

    asked by Anonymous on January 7, 2010
  79. algebra

    I have a few problems I need you to take a look at and tell me if I arrived at the right answer. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1), (-6,

    asked by shane on January 7, 2010
  80. college chem

    how many grams of NH4Cl are required to prepare 250 mL of .122 M NH4Cl solution? I set this up using the molarity equation and the part that I was missing is moles. So I divided the 0.122 by .25 L and got .031 mol. Then I took that and multiplied it by the

    asked by kelly on June 2, 2009
  81. math

    An equation is shown below: 3 over 2 multiplied by x plus 7 over 2 equals 2 to the power of x What is the solution to the equation A.X=1 B.X=3 C.X=5 D.X=8 I think it could be d

    asked by Isabella on December 8, 2015
  82. algebra2

    solve the systems of equation: First : 4x-2y = 2 Second: y = -4x-7 Should i solve by using substitution, elimination or multiply then use elimination? Try adding them. Add up the left sides and the right sides (after rearranging the second equation) the x

    asked by ann on July 26, 2007
  83. math

    solve the polynomial inequality and graph the solution set on a real number line. express the solution set in interval notation x^3+x^2+64x+64>0 show work please

    asked by Paul on January 9, 2013
  84. Algebra

    A chemist mixed a 70% alcohol solution with a 30% alcohol solution to make a 45% alcohol solution. How many liters of each were used to make 120 L of a 45% solution? I tried solving this with elimination method and made two separate equations. For

    asked by Annie on May 20, 2016
  85. Chemistry

    An 8 Molar (aqueous) solution contains H2O and HNO3. The solution has an S.G. of 1.24 at 25oC. HNO3 is a strong acid that completely dissociates in water. a) Calculate the mass of I Litre of solution. b) Calculate the mass concentration (g/L) of HNO3 in

    asked by Dodes on November 3, 2017
  86. Math-Algebra 1

    Part 1: When writing linear equations, how do you determine which form of a line to use? Part 2: Choose 1 set of points from the choices below. Then, solve the problem and post your solution, showing your steps. Write an equation in point-slope form for

    asked by Gabby on November 23, 2013
  87. math-please help,need quickly

    solve the polynomial inequality and graph the solution set on a real num ber line. express the solution set in interval notation x^3+x^2+64x+64>0 please show work

    asked by anonymous on January 10, 2013
  88. Chemistry

    Determine how many mL of solution A (acetic acid-indicator solution) must be added to solution B (sodium acetate-indicator solution) to obtain a buffer solution that is equimolar in acetate and acetic acid. Solution A: 10.0 mL 3.0e-4M bromescol green

    asked by Jake on October 29, 2012
  89. college algebra

    A partial solution set is given for the polynomial equation. Find the complete solution set. (Enter your answers as a comma-separated list.) x^3 + 3x^2 − 14x − 20 = 0; {−5}

    asked by Dee on November 18, 2013
  90. Chemistry

    A solution is prepared by diluting 65.0 mL of 0.175 M methylamine, CH3NH2, to a total volume of 225 mL. Calculate the pH of the diluted solution. Kb (CH3NH2) = 4.40 x 10-4

    asked by Mallory on June 26, 2011
  91. Chemistry

    A is a solution of trioxonitrate (V) acid. HNO of unknown concentration B is standard solution of sodium hydroxide containing 4.00g per dm3 of solution 25cm3 portion solution B required an average of 24.00cm3 of solution A for neutralization. Using 2 drop

    asked by EMMANUEL on June 6, 2018
  92. algebra

    Thee area of the rectangle athletic field represented by the expressio 25y^2-4z^2 square meters. Write an algebriac expression to represent one possible set of dimensions(in the sense''length times width'')of the athletic field. include units with the

    asked by Liz on February 11, 2011
  93. ALGEBRA again still need help !

    need help solving this word problem, converting from words to an equation 48 equals a number increased by 6, and the sum, all multiplied by 5. I have the answer, but I am unable to set up an equation. answer - x=3 3/5

    asked by Rose on October 9, 2008
  94. physics

    An 11.4 kg block of metal is suspended from a scale and immersed in water, as in the figure below. The dimensions of the block are 12.0 cm multiplied by 11.1 cm multiplied by 11.1 cm. The 12.0 cm dimension is vertical, and the top of the block is 5.00 cm

    asked by PJ on April 17, 2012
  95. maths

    a conical tank open at the top is 4m and has a top radius of 1m its filled with water and after 2 hours, the depth of water dropped to 1m due to evaporation.set up a differential equation for the depth of water as a function of time.set up an equation for

    asked by apollo on November 9, 2011
  96. Pre-Algebra

    I need to check my work... estimate the following products or quotients 17 11/12 divided by 6 1/10 The first step I did was convert to improper fraction then I multiplied after changing the reciprical, and then I multiplied the numerators and then

    asked by Anonymous on July 31, 2009
  97. chemistry

    I have many questions. I have a test tuesday and need to get these problems done and understand them today because i am currently studying. I am in college and my professor has not emailed me back regarding solutions for the review problems she posted. Is

    asked by Sarah (C) on April 23, 2011
  98. Chem

    Calculate the [NH4+] in solution that is 0.25 M NH3 and 0.20 M NaOH. (Kb for NH3 = 1.8 x 10-5) I set up ICE from the equation: NH3 + H20 ------NH4 + OH- I 0.25 0 0 C -x +x +x E 0.25-x x x 1.8 *10^-5 = x*x/ 0.25-x 4.5* 10^-6 = x2 took the square root to

    asked by AMI on April 6, 2010
  99. Chemistry

    Calculate the pH of the solution that is prepared by mixing 26.06g of ammonium iodide (MM=144.942) and 5.08g of ammonia (MM=17.034g) in enough 0.066 M HCI to produce 1.00L of solution. Kb(NH3)=1.76x10^-5 I converted 24.06g and 5.08g to moles and i now I

    asked by nns40760 on December 1, 2014
  100. Algebra

    The Coffee Counter charges $9.00 per pound for Kenyan French Roast coffee and $8.00 per pound for Sumatran coffee. How much of each type should be used to make a 20-lb blend that sells for $8.40 per pound? Here are the 2 equations (or system of equations)

    asked by Valeria on February 20, 2009

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