1. My Math

    ecide whether each equation has one solution, no solutions, or infinitely many solutions. 1. 2(x – 3) = 2x (1 point) one solution no solutions infinitely many solutions 2. 3(y – 3) = 2y – 9 + y (1 point) one solution no solutions infinitely many

    asked by Jenny on December 11, 2012
  2. Algebra

    I have to solve the following equation: x+y=9 xy=54 I changed the first equation to y=9-x to solve for y. I got x(9-x)=54 and then 9x-x^2=54. I then changed 9x-x^2= 54 to -x^2 +9x-54=0. I got stuck around here, can someone explain...

    asked by rob on January 2, 2009
  3. math

    What is the equation of the tangent line given the curve: y = (3+lnx)^2 at x = 1/e dy/dx = 2[3 + Ln(x))]*1/x at x = 1/e this is: 4*e y(1/e) = 4 The equation of the tangent line is thus given by: 4e(x-1/e) + 4

    asked by Jay on December 5, 2006
  4. Algebra

    Graph the equation by plotting points that satisfy the equation. 5x + y = −4 What would the 4 points be? I'm getting: -5,21 -4,16 0,-4 4,-24 The graph only goes up to 10.

    asked by Kim on October 8, 2014
  5. statistics

    How do you know whether to use the sample standard deviation equation or the population standard deviation equation?

    asked by cheeky on December 9, 2008
  6. Algebra

    1. Solve the equation -5y-9=(y-1) A. -1/2

    asked by Petter on August 20, 2017
  7. Trig

    Solve the equation 2sin(2x) = cos x. and Solve the equation cos^2(2x)–sin^2(2x)= (√3 / 2).

    asked by Help on April 1, 2012
  8. Math

    Find the equation for the line with the following. parallel to the line 8x+7y=-7 and containing the point (7,-7) Since it it parallel the equation would have to have 8x, right? Then im not sure what to do.

    asked by Hannah on October 7, 2010
  9. honors math

    Y=16-5x Y=1/2x-9 Y=3x Y=10 Need to write a parallel equation, perpendicular equation and neither parallel nor perpendicular line for all of them, please help

    asked by Anonymous on November 4, 2015
  10. Mathematics

    Solve the quadratic equation 3x²=27 Solve the quadratic equation 2x² - 4x + 1 = 0

    asked by Jo on April 30, 2018
  11. Chemistry

    What is the pH of a 1.00 L solution of the following buffer 0.500 M propanoic acid (HC3H5O2 Ka = 1.30 × 10^−5) / 0.800 M sodium propanoate after the addition of 0.700 mol solid NaOH. I tried using the Henderson-Hasselbach equation pH = pKa + log[A-/HA]

    asked by Anonymous on October 27, 2009
  12. Chemistry

    Subjects Art Business Computers English Foreign Languages Health Home Economics Mathematics Music Physical Education Science Social Studies Features Contribute Download Experts Forum Job Openings Homework Tips Libraries.Jiskha Link to Us Reference School

    asked by Jared on July 9, 2007
  13. PreCalculas

    1.Write the equation of the conic section with the given properties: A hyperbola with vertices(0,6)(0,-6)and asymptotes y=3/4x and y=-3/4x. 2.Write the equation of the conic section with the given properties: An ellipse with vertices(0,-5)(0,5)and a minor

    asked by Anonymous on December 3, 2015
  14. chemistry

    Sodium flouride, NaF, is a basic salt. Write the chemical equation that describes how the salt breaks up into its ions. Write the chemical equation that describes how one of the ions behaves as a base in water to produce OH-.

    asked by John on June 27, 2010
  15. algebra

    Write the equation for this situation: the value, v, in hundreds of dollars, of Bob’s stamp collection is 12 dollars more than 1/3 of the age, t (in years). Then graph the equation and use the graph to determine the value of Bob’s coin collection if it

    asked by Sharday on November 1, 2011
  16. PreCalculas help

    1.Write the equation of the conic section with the given properties: A hyperbola with vertices(0,6)(0,-6)and asymptotes y=3/4x and y=-3/4x. 2.Write the equation of the conic section with the given properties: An ellipse with vertices(0,-5)(0,5)and a minor

    asked by Anonymous on December 2, 2015
  17. math

    Sal keeps quarters, nickels, and dimes in his change jar. He has a total of 52 coins. He has three more quarters than dimes and five fewer nickels than dimes. How many dimes does Sal have? A. 13 B. 18 C. 20 D. 21 E. None of these. Here is the equation I

    asked by guitarman on March 29, 2010
  18. MATH,CORRECTION

    Directions solve each of the following problems. Besure to show the equation used for the solution. In a town election, the winning candidate had 220 more votes than the loser. If 810 votes were cast in all, how many votes did each candidate received?

    asked by jasmine20 on February 5, 2007
  19. physics

    The drawing shows a copper wire (negligible resistance) bentinto a circular shape with a radius of 0.48 m. The radial sectionBC is fixed in place, while the copper bar ACsweeps around at an angular speed of 16 rad/s. The bar makeselectrical contact with

    asked by Daniel on March 12, 2012
  20. chemistry

    Element Symbol Atomic Mass --------------------------------------- Bromine Br 79.904 Calcium Ca 40.078 Carbon C 12.011 Chlorine Cl 35.4527 Cobalt Co 58.93320 Copper Cu 63.546 Flourine F 18.9984032 Hydrogen H 1.00794 Iodine I 126.904 Iron Fe 55.847 Lead Pb

    asked by Chris on April 15, 2008
  21. chemistry

    if it requires 35.0 milliliters of 0.50 molar NaOH to neutralize 25.0 milliliters of HCl, what is the concentration of the HCl solution? Balanced equation: NaOH + HCl yields NaCl + H2O

    asked by smith on November 17, 2010
  22. chemistry

    If it requires 30.0 milliliters of 1.2 molar HCl to neutralize 20.0 milliliters of NaOH, what is the concentration of the NaOH solution? Balanced equation: NaOH + HCl NaCl + H2O (3 points)

    asked by Anonymous on June 22, 2011
  23. Math

    4th and 7 terms of a G.P. are 1/18 and -1/ 486 respectively. Find the G.P. My solution: ar^3=1/18.... eq no1 ar^6=-1/486...eq no2 ar^6/ar^3 = -1/486÷1/18 r^3=-1/27 r=-1/3 Place this value in equation 1 ar^3=1/18 a*-1/3^3=1/18 a*-1/27=1/18 a=-7/6 Required

    asked by Prachi on July 18, 2017
  24. Algebra

    Can you please check my answers? Solve the rational inequality and graph the solution set on a real number line. Express the solution set in interval notation. x-2/x+1 or equal to 0 my answer: (3,8] 2/x-2

    asked by Joss on October 23, 2007
  25. Rational Inequities

    Can you please check my answers? Solve the rational inequality and graph the solution set on a real number line. Express the solution set in interval notation. x-2/x+1 or equal to 0 my answer: (3,8] 2/x-2

    asked by Joss on October 24, 2007
  26. Chemistry

    What is the molarity of a solution of Mg(OH)2 if the solution contains 1.35 g in exactly 100 mL of solution??? A 15.0 mL solution of H2SO3 is neutralized by 12.0 mL of a standradized 1.00M NaOH solution. What is the concentration of the H2SO3

    asked by Tasha on December 12, 2012
  27. Chemistry

    If 50.0 mL of a 1.00 M solution of CaCl2 (solution A) is mixed with 85.0 mL of pure water to produce solution B and then 42.5 mL of solution B is mixed with 52.0 mL of solution A to give solution C, what is the concentration of CL^-(aq) in the final

    asked by John on April 29, 2018
  28. Physics

    A clock has a second hand which rubs against the inside of the glass cover. If the frictional force between the glass cover and the tip of the hand is 0.0020 N and the length of the hand is 8 cm, what minimum torque must be supplied to the hand by the

    asked by Anonymous on November 9, 2016
  29. Math ; please please help.

    1. Explain in detail how to determine the value of the independent variable in a quadratic relation if the value of the dependent variable is known. Please check my answer - You would substitute the value for the dependent variable, then you would solve

    asked by Amanda on April 9, 2008
  30. chemistry

    Silver nitrate (AgNO3) reacts with sodium chloride as indicated by the equation AgNO3 + NaCl ! AgCl + NaNO3 . How many grams of NaCl would be re- quired to react with 511 mL of 0.38 M AgNO3 solution? Answer in units of grams

    asked by cheri on September 19, 2012
  31. Math - Simple rational Function (check)

    A pollutant has been leaking steadily into a river. An environmental group undertakes a clean-up of the river. The amount of pollutant in the river after t years the clean-up begins is given by the equation N(t)=0.5t+(1/(10t+1)) a) What quantity of

    asked by Anonymous on October 25, 2010
  32. Algebra

    I think I have the correct equation, but can someone please double check and tell me if I am correct. Scenario: Suppose that the width of a rectangle is 5 inches shorter than the length, and that the perimeter of the rectangle is 50. Question: Set up an

    asked by Patrick on January 3, 2009
  33. Math

    did i work these problems right if not could some one show me how to work all three of them. 8.Represent the quantity with a real number: An altitude of 400 feet (ft) above sea level: 400 is a real number. I could also use 4 as a real number representing a

    asked by Gertrude Sanders on November 9, 2008
  34. ALGEBRA

    Find the coordinates of the midpoint for the following equation: y = -2x^2 + 20x + 1. Your answer should be in the form (x-coordinate, y-coordinate). (Hint: Find the x-coordinate by using the Midpoint Formula [-b / (2a)]. Then find the y-coordinate by

    asked by GGIFT on March 28, 2010
  35. Linear Equation

    A gas station sells regular gas for $2.20 per gallon and premium gas for $2.70 a gallon. At the end of a business day 220 gallons of gas were sold and receipts totaled $519. How many gallons of each type of gas were sold? I know its a linear equation. just

    asked by Sara on July 12, 2013
  36. Chemistr repost

    Determine the cell potential (in V) for a platinum electrode in an acidic solution of 0.004M H+(aq), 3.226M ClO4-(aq) and 4.445M ClO3- (aq) ions, coupled to a gold electrode in 3.238 M Au3+ (aq) at 307.10 K. Im confused about the mulitple molarities given

    asked by Matt on March 1, 2008
  37. Chemistry

    Determine the cell potential (in V) for a platinum electrode in an acidic solution of 0.004M H+(aq), 3.226M ClO4-(aq) and 4.445M ClO3- (aq) ions, coupled to a gold electrode in 3.238 M Au3+ (aq) at 307.10 K. Im confused about the mulitple molarities given

    asked by Matt on March 1, 2008
  38. Math

    A certain type of bacteria is growing at an exponential rate that can be modeled by the equation y=ae^kt, where t represents the number of hours. There are 300 bacteria initially, and 1500 bacteria 5 hours later. Find the rate of growth, k, of the

    asked by Aria on June 4, 2017
  39. Chemistry

    Question as follows: 75.0g tartaric acid in 1 Liter is what molarity(moles/liter) mw=150.087 g/mol M1= 25 ml tartaric solution is titrated with 31 ml ammonium. What is the equation rearanged for normality of ammonium: starting with N1V1=N2V2 N1= V1= V2=

    asked by Cicily on October 12, 2012
  40. chemistry

    I'm working on substitution organic chemistry problems and I just had a question. There's an equation in which a molecule is treated with methanol in an acetone solution. Would the reaction be SN1 or SN2? I thought that it was SN2 because of the aprotic

    asked by Jin on November 29, 2014
  41. Algebra Help

    How do I find the center of a circle using the points (2,8) (-4,6) (1,-1) I also found the Equation of the perpendicular bisector of the line between the first and second point which was y=(3/2)x + 5 And the Equation of the perpendicular bisector of the

    asked by Bri on September 24, 2014
  42. alg.

    Find the coordinates of the vertex and the equation of the axis of symmetry of the parabola with the given equation. y = 8x2 + 48x − 3 vertex (x, y) = _____________ axis of symmetry _____________

    asked by KMILLhelp on April 21, 2014
  43. algebra

    what is the slope-intercept form of the linear equation whose graph passes through (-2,4) and is parallel to the graph 3x+y=6? a) y =-3x - 2 b) y =-3x + 10 c) y = 3x - 2 d) y = 3x + 10 which linear equation represents a line that passes through (3,-7) and

    asked by cassie on December 10, 2015
  44. Chemistry(Please respond)

    Step 1:H2O2 + I^-^ = H2O + OI^-^ step 2: H2O2 + OI^-^ = H2O + O2 + I^-^ What is the equation for the overall reaction? I am not sure how to do this since there are two equations. Complete the rate law for the overall reaction. I know how to do this one but

    asked by Hannah on April 19, 2012
  45. pre-calculus

    How do you write the standard form of the equation of the line passing through the points M(-4,-2) and N(4,7)? How do you find the slope-intercept form of the equation of the line passing through the points P(2,-9) and Q(3,-7)?

    asked by maxine on May 13, 2009
  46. pre-calculus

    How do you write the standard form of the equation of the line passing through the points M(-4,-2) and N(4,7)? How do you find the slope-intercept form of the equation of the line passing through the points P(2,-9) and Q(3,-7)?

    asked by maxine on May 13, 2009
  47. Calculus III

    Topic: Quadric surfaces. I have two homework problems, and they are quite a doozy for me. So the point is, I am given details of a quadric surface on the Cartesian coordinate system, and thus have to use the data to construct an equation through it.

    asked by Justin on September 18, 2016
  48. Chemistry

    So if i have the equation 2 SO3 --> 2S + 3 O2 would my word equation for this be Sulfur Oxide --> Sulfur + Oxygen OR Sulfur hexaoxide --> Sulfur + hexaoxide or what would be the correct one if both are wrong? and for this one 2 KI + MgCI2 --> MgI2 + 2KCL

    asked by Holfbrincl on March 7, 2016
  49. physics

    Suppose the stone is thrown at an angle of 30.0 degrees below the horizontal. If it strikes the ground 57.0 m away, find (a) the time of flight, (b) the initial speed, and (c) the speed and the angle of the velocity vector with respect to the horizontal

    asked by Adam on October 14, 2015
  50. Chemistry 30

    Complete the following reactions by moving only one proton at a time. Identify the acid (A) and the base (B) on the left-hand side of the equation, and the conjugate acid (CA) and the conjugate base (CB) on the right-hand side of the equation, according to

    asked by Ade on October 2, 2014
  51. Physics - Please help!

    Ironman steps from the top of a tall building. He falls freely from rest to the ground a distance of h. He falls a distance of h/ 3 in the last interval of time of 1.1 s of his fall. Hint: First, compute the velocity when Ironman reaches the height equal

    asked by Anonymous on October 22, 2010
  52. Physics

    Ironman steps from the top of a tall building. He falls freely from rest to the ground a distance of h. He falls a distance of h/ 3 in the last interval of time of 1.1 s of his fall. Hint: First, compute the velocity when Ironman reaches the height equal

    asked by Trevor on October 22, 2010
  53. physics

    The vector position of a 3.75 g particle moving in the xy plane varies in time according to the following equation. At the same time, the vector position of a 5.20 g particle varies according to the following equation. For each equation, t is in s and r is

    asked by carlton on November 27, 2011
  54. GK..please check...Chemistry Help Please

    Moles of S203^2- = (molarity)(volume): =(0.032400 mol/L)(0.053 litres S203^2-) = 0.03240 moles S203^2- Moles if I2 based on Equation #2: Moles I2 = (1/2)( 0.03240 moles S203^2-) = .00086 moles I2 Moles of ClO^- based on Equation #1: Moles ClO-(aq) =

    asked by Sara on October 22, 2008
  55. A.P. Chemistry

    You have solutions of 0.200 M HNO2 and 0.200 M KNO2 (Ka for HNO2 = 4.00  10-4). A buffer of pH 3.000 is needed. What volumes of HNO2 and KNO2 are required to make 1 liter of buffered solution? How does the henderson hasslebache equation help find the

    asked by Oli on April 3, 2010
  56. chemistry

    What is the value of [OH-] in a 0.015 M CH3COOH solution? Ka = 1.8 x 10-5 I started by writing the equation: CH3COOH + H2O H3O+ + CH3COO- Ka= [H3O+][CH3COO-]/[CH3COOH]= 1.8 E-5 ... Now what? I don't understand where OH relates to this ...

    asked by Audrey on November 15, 2010
  57. chem

    In a solution prepared by mixing CH3OH with H2O the major species pesent are 1. a. CH3+, OH, and H2O 2. b. CH3O, H+, and H2O 3. c. CH3OH and H2O 4. d. CH3OH, H+, and OH I know i have to get an equation having trouble doing that!! please help!!

    asked by Mark on April 24, 2010
  58. algebra

    Which of the following is not a step used when graphing the equation y = −x + 8 using the slope-intercept method? Explain the correct order of steps needed to graph this equation, using the slope-intercept method. Plot the x-intercept (32, 0). Plot the

    asked by courtney on August 18, 2010
  59. CHEMISTRY HELP

    Calculate the amount (in mL) of 1.520M NaOH that is required to add the following acetic acid solution to prepare a buffer with the corresponding pH: 30.00mL of a 5.00% (w/v%) acetic acid; the resulting acetate buffer has a pH of 5.75. pKa of acetic acid =

    asked by Mike on February 19, 2016
  60. Molarity

    A 15.7mL sample of HNO3 reacts to neutralize 27.7mL of 0.187M KOH solution. What is the molarity of the HNO3 solution? HNO3 + KOH ==> KNO3 + HOH mols KOH = L x M = 0.0277 x 0.187 = ?? mols HNO3 = mols KOH (1 mol reacts with 1 mol). mols HNO3 = L x M You

    asked by Kellie on February 25, 2007
  61. Algebra2

    Write an equation for the line that passes through (0,7) and is perpendicular to the line whose equation is y = 1/2x-1. my answer is y = 2x-7 is this correct? That can't be right, because when x=0, y must be 7. Furthermore, the slope of the line you want

    asked by Anonymous on July 26, 2007
  62. Math

    I can't seem remember the rules for this.Can someone please help me with the following questions? You can find the roots of a quadratic equation by determining the zeros of the quadratic function or the ...? You can find the roots of a quadratic equation

    asked by Alex on November 3, 2014
  63. MAth

    2+3m=17 7 6 10 5 use inverse operations to solve each equation. Explain each step and identify the propaty used to reach steps. 19=h/3-8 solve the equation : expiation each step and identify the property used to reach each step 0.6x+0.8=1.4 thanks

    asked by AABBCC on October 25, 2015
  64. MAth

    2+3m=17 7 6 10 5 use inverse operations to solve each equation. Explain each step and identify the propaty used to reach steps. 19=h/3-8 solve the equation : expiation each step and identify the property used to reach each step 0.6x+0.8=1.4 thanks

    asked by AABBCC on October 24, 2015
  65. Algebra 2

    1) Find the roots of the polynomial equation. x^3-2x^2+10x+136=0 2) Use the rational root theorem to list all problem rational roots of the polynomial equation. x^3+x^2-7x-4=0. Do not find the actual roots.

    asked by Anonymous on December 4, 2017
  66. algebra

    can someone explain the benefits of writing a quadratic equation in vertex form and benefits of writing a quadratic equation in standard form? Name specific methods you can use while working with one form or the other. Any help will be appreciated.

    asked by Lee on November 5, 2012
  67. math

    the straight L has gradient 3 and passes through the point A(-6,4). a) find an equation for L in the form y=mx+c b) straight line R has the equation in the form of -7y+x+14=0. Given that R crosses the y-axis at the point B and intersects L at the point C,

    asked by aminath on February 24, 2012
  68. math

    For sin(θ) = -0.4321, 0 ≤ θ ≤ 360°. (8) How many solutions are possible? In which quadrants would you find the solutions? Determine the reference angle for this equation to the nearest degree. Determine all the solutions to the equation to the

    asked by Sammy PLEASE HELP on August 30, 2017
  69. chem

    What is the pH ( 3 significant digits) of a 0.01 M solution of sulfuric acid? Hint is that the first ionization constant is "large", and the second is finite, and the [H+] donated by the second equilibrium depends upon the amount of [H+] already donated by

    asked by lyne on March 26, 2008
  70. chemistry (electrochemistry)

    1) For the following electrochemical cell Cu(s)|Cu2 (aq, 0.0155 M)||Ag (aq, 1.50 M)|Ag(s) write the net cell equation. Calculate the following values using standard potentials as needed. Eo cell and dGo for each

    asked by Andrew on April 15, 2013
  71. MATH

    use the discriminant to determine whether the following equation have solutions that are : two different rational solutions : two different irrational solutions : exactly one rational solution : or two different imaginary solutions 7+5z^2=-8z

    asked by LIZY on March 26, 2013
  72. math

    A cold front caused the temperature to drop to 21f. The temperature after the drop was 36f. Write and solve an equation to find the temperature before the temperature dropped. my answer is 57f. my equation is 36f=21f-f

    asked by Americal on February 4, 2013
  73. Algebra Please!

    Posted by Thomas M on Monday, March 9, 2015 at 4:12am. I am working wth a cell phone performance task project. I have to determine which three cell phones are the best for a first time user and develop an equation for each of them. Wal-Mart has a plan for

    asked by Thomas M on March 9, 2015
  74. Physics-Mechanics

    A pulley is massless and frictionless. 3 kg, 2 kg (on the left), and 6 kg (on the right) masses are suspended What is the tension T1 in the string be- tween the two blocks on the left-hand side of the pulley? Can I solve this like if it was two masses? My

    asked by Genevieve on September 22, 2010
  75. chemistry

    The kinetic theory of gases is based on a number postulates from which the equation P= 1/3× N/V×m×µ² is derived (P is the pressure of the gas, N the number of molecules in the container, m the mass of each molecule and µ² is the mean square speed).

    asked by Taylor on December 26, 2013
  76. Precalculus

    "Sketch the ellipse. Find the coordinates of its vertices and foci. 34. x^2 + 25y^2 - 6x - 100y + 84 = 0 (Hint: Complete the squares in x and y. Begin by writing the equation in this form: (x^2 - 6x + ___) + 25(y^2 - 4y + ___) = -84.)" ==> I used the hint

    asked by Emily on November 23, 2009
  77. chemistry

    The thermal decomposition of calcium carbonate produces 2 by-products, c02 and calcium oxide. calculate the volume of the co2 produced at STP from the decomposition of 231 grams of caco3. i know the equation i need to use is V=nrt/p but am i supposed to

    asked by Katherine on February 18, 2010
  78. Calculus III

    Find the moment of inertia about a diameter of s spherical shell of uniform density, D, bounded by two concentric spheres of radii a and b, where a

    asked by E on August 4, 2014
  79. algebra

    theperimeter of a rectangle is32 ft. The lenght is 12 ft longer than the width. Find the dimensions. Write a system of linear equations and solve the resulting system. Let x be the lenght and y be the width write the first equation 2x-2y= write the second

    asked by Anonymous on April 20, 2012
  80. chemistry

    In the reaction of sodium metal with chlorine gas to form sodium chloride, how does chlorine form an anion? Write an equation to support your answer. I know that chlorine becomes an anion since it's gaining an electron from sodium, but how do I show that

    asked by Anonymous on June 28, 2015
  81. algebra

    the primeter of a rectangle is 24ft. the length is 2 ft longer than the width. Find the dimensions. Write a system of linear equations and solve the resulting system. Let x be the length and y be the width, write the first equation. 2x+2y=__ write the

    asked by ashley on March 5, 2013
  82. 8th grade math

    Your uncle is three years older than your aunt. The product of their ages is 3190. What are their ages? I know the answer is 55 and 58. But I can't come up with the correct formula or equation to get the answer. I've tried 3(A+3)=3190. It doesn't come up

    asked by KL on February 7, 2008
  83. algebra world problems

    1) the odometer on your car reads 20,186.7 after going 62.3 miles. write and solve an equation to determoine how many miles were on the odometere before going 62.3 miles. i wrote this; 0-62.3 = 20,186.7 2) michael bought a $25.00 gift for a friend. After

    asked by marko on October 17, 2011
  84. Algebra

    One number is 6 more than another number and their sum is 2. How would i make that an equation thought. for example if the question was, Jane spent $42.00 for shoes. This was $14 less than twice what she spent for a blouse. How much was the blouse? the

    asked by Steve on January 20, 2007
  85. Calc, Implicit Differentiation

    Regard y as independent variable and x as dependant variable and find the slope of the tangent line to the curve (4x^2 + 2y2)^2 - x^2y = 4588 at point (3,4). Correct answer is -0.668827160493827 Here's what I did: 2(8x(dy/dx) + 4y) -2x(dx/dy)y + x^2 = 0

    asked by Michael on October 21, 2006
  86. algebra

    from our text book "Bittenger, M. L. & Beecher, J. A. (2007). Introductory and intermediate algebra (3rd ed.). Boston: Pearson-Addison Wesley" can someone please help me with "Review examples 2, 3, and 4 in section 8.4 of the text. •How does the author

    asked by judyanne on January 13, 2011
  87. Chemistry!

    Use the equation below and determine what volume of O2 at STP is needed to react with 1.5 moles of C2H4? Balanced equation: C2H4 + 3O2 --> 2CO2 + 2H20 So 1 mole of C2H4/3 mol O2 --> 1.5 mols/ 4.5 mols O2. So if its 1 mol equals 1 liter, than it should be

    asked by Casey on July 10, 2010
  88. Physics PLEASE

    I'm trying to solve this problem Calculate (a) how long it took King Kong to fall straight down form the top of the Empire State Building (380 m high), and (b) his velocity just before "landing". My teacher said try and rearagne this equation for t X = Xo

    asked by Physics PLEASE on June 23, 2009
  89. ALGEBRA 3

    so wat do u mean by that WHICH ORDERED PAIR IS A SOLUTION OF THE FOLLOWING SYSTEM OF LINEAR EQUATION 2X-5Y=NEGATIVE 12 NEGATIVEX +4Y=9 A{NEGATIVE6,0} B{3,3} C{NEGATIVE1,2} D{2,2} I will be happy to critique your thinking on this. I mean I wont do your

    asked by WOLF on January 12, 2007
  90. chemistry

    permanganate ion oxidizes hydrogen peroxide to oxygen gas and Mn2+ in acidic solution balance this equation: MnO4- + H2O2 yield Mn2+ + O2 this is what i got 16H+ + 2MnO4- + 5H2O2 yield 2Mn2+ + 8H2O + 5O2 + 10H+ all the atoms and charges are balanced but

    asked by bme1(check my answer) on May 15, 2010
  91. chemistry

    Write a balanced equation for the following reaction. Use whole number coefficients and subscripts appropriately. When hydrochloric acid is mixed with sodium hydrogen carbonate, the mixture fizzes. The fizzing occurs because the reaction produces a gas,

    asked by Mike on February 1, 2016
  92. Chemistry

    Silver nitrate (AgNO3) reacts with sodium chloride as indicated by the equation AgNO3 + NaCl ! AgCl + NaNO3 . Howmany grams of NaCl would be required to react with 518 mL of 0.543 M AgNO3 solution? Answer in units of grams

    asked by Broy on October 4, 2011
  93. Chemistry

    In a titration experiment involving an unknown concentration of HCl and a 0.100M solution of NaOH(aq), it was determined that it took 12.5mL of NaOH to neutralize 20.0mL of the HCl(aq). Write a balanced chemical equation for this reaction and determine the

    asked by Kat on January 22, 2015
  94. Maths

    A line has Cartesian equations given by x-1/3=y+2/4=z-4/5 a) Give the coordinates of the point on the line b) Give the vector parallel to the line c) Write down the equation of the line in parametric form d) Determine the Cartesian equation of the plane

    asked by Ivory on April 23, 2019
  95. math

    Find the sales tax rate in your area. Using this tax rate, write a linear equation representing the total with tax for a purchase of x dollars. Use this equation to determine what the pre-tax cost of the item is if the total cost with tax is $10.

    asked by Heather on May 31, 2010
  96. math

    A. determine the equation of the circle passing through points A(3;2) B(8;12) and C(-6;-2) B. a chord of the circle x^2+y^2=50 has a midpoint at (6;3). determine the equation of this chord.

    asked by Anonymous on May 6, 2015
  97. chemistry

    what is the skeleton chemical equation of this? And Balanced equation. Copper (ii) chloride + Lithium --> Lithium Chloride + Copper

    asked by SAM on October 18, 2016
  98. Algebra

    Find the variation constant and an equation of variation where Y varies directly as X and Y=60 when X=10 k=variation constant y=equation of variation Still do not understand..please..

    asked by Maria1 on May 5, 2012
  99. Calculus

    If G(x)=(x)/(1+2x), find G'(a) and use it to find an equation of the tangent line to the curve y=(x)/(1+2x) at the point (-1/4,-1/2). My answer: G'(a)=1/(1+2x)^2 Equation of tangent line: y= 4x+0.5

    asked by Anonymous on October 18, 2014
  100. chemistry

    what is the skeleton chemical equation of this? And Balanced equation. Copper (ii) chloride + Lithium --> Lithium Chloride + Copper

    asked by SAM on October 18, 2016

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