1. chemistry

    An ore contains Fe3O4 and no other iron. The iron in a 38.9-gram sample of the ore is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 12.5 g. What was the mass of Fe3O4 in the sample of ore? Please show all

    asked by K on September 5, 2013
  2. Algebra 2

    Solving By Factoring: The length of the side of a large square is 1 cm less than twice the length of the of the side of a smaller square. The area of the large square is 33cm^2 more than the area of the small square. Find the length of the sides of the two

    asked by Miguelina on November 9, 2014
  3. math

    Please show me how to work this problem: Fran makes a rectangular tablecloth that has an area of 5 ft squared. Her mother makes a tablecloth that is three times the length and three times the width of Fran's. What is the area, in square feet, of her

    asked by Jane on November 19, 2011
  4. MATH

    Rachel sold a total of 8/10 pound of apples and berries at farmer's market . The Weight of the apples is 3/4 of the total weight of the fruit. What is the weight of the berries ? A. 1/20 pounds B. 1/4 pounds C. 1/2 pounds D. 3/5 pounds pls show the work n

    asked by SAI on August 17, 2015
  5. Math, help please

    You buy clothing at a sale. You buy sneakers at 2/3 of their original price of $60, a sweater at 7/10 of its original price of $35, and a jacket at 7/10 of its original price of $45. Answer each question and show all your work. a. How much money did you

    asked by Nora on January 28, 2018
  6. Math - Algebra I

    Consider the subsets of R defined as follows: An is the interval (0,1/n) for all natural numbers. Show that: U (union) n=1 to infinity of An = (0,1) Here's what I tried as a proof: Show that (0,1) is a subset of U n=1 to infinity An Take an arbitrary real

    asked by Lola on February 7, 2016
  7. Physics

    (a) CO2 emissions C from a nation’s energy system can be expressed as: C = Population x Energy consumption per person x CO2 emissions per unit of energy consumption. Initially, total emissions are 600 million tonnes of CO2 per year. If, over a 50-year

    asked by Raven on August 2, 2010
  8. chemistry

    If you pass 10.0mL of a 50.0mL solution of [Co(en)2Cl2]Cl that has been reduced with Zn through a cation exchange column, you will obtain a solution that has three H+ ions for every Co3+ ion that was originally present in the sample. These H+ ions are

    asked by xx on October 26, 2014
  9. Please Help!!!!!!

    Decide whether the following problem can be solved using precalculus, or whether calculus is required. If the problem can be solved using precalculus, solve it. If the problem seems to require calculus, explain your reasoning and use a graphical or

    asked by Anonymous on January 9, 2012
  10. calculus

    What is the instantaneous slope of y =8/x at x = -3? What is the average rate of change of y with respect to x over the interval [-3, 4] for the function y = 2x + 2? The surface area, S, of a sphere of radius r feet is S = S(r) = 4πr2. Find the

    asked by Jack P on January 16, 2015
  11. Chemistry

    The question is: what is the ratio [NH3/[NH4+] in an ammonia/ammonium chloride buffer solution with pH= 10.00? (pKa for ammonia=9.25) When working the problem, I tried to solve it a bit backwards, in that I plugged in each of the multiple choices I was

    asked by Marcus on April 9, 2013
  12. math

    if (2x-3):(y+4)=k where k is a constant and x=4 when y=2 then find x when y=-6 What does the : between the factor mean? (2x-3) : (y+4)=k Multi[lication? If so, substitute 4 for x and 2 for y to get (2*4-3):(2+4)=k = 5*6 Then solve for x in (2x-3):(-6+4)=30

    asked by Gina on October 7, 2006
  13. Advanced Physic

    A gob of clay, mass 217 g, falls from rest a distance 50 cm before striking and sticking to the edge of a wheel free to rotate about a horizontal axis through its center (Fig. 10-38). The wheel can be approximated as a solid disk of mass 49 kg and radius

    asked by Anonymous on May 14, 2014
  14. Physics

    A horizontal force of magnitude 30.0 N pushes a block of mass 3.85 kg a distance of 3.00 m across a floor, where the coefficient of kinetic friction is 0.600 a.)How much work is done by that applied force on the block-floor system? b.)During that

    asked by Sam on November 30, 2010
  15. 10

    A runner is at the starting gate and hears the starting gun. He begins running with a constant acceleration ai = 0.55 m/s2. He crosses the finish line at d = 100 m and then begins slowing down. It takes him tr to cross the finish line. It takes him ts =

    asked by joe on September 11, 2014
  16. physics

    A runner is at the starting gate and hears the starting gun. He begins running with a constant acceleration ai = 0.55 m/s2. He crosses the finish line at d = 100 m and then begins slowing down. It takes him tr to cross the finish line. It takes him ts =

    asked by joe 10 on September 11, 2014
  17. chemistry

    The densities of three solutions with known concentrations ( 20% , 50%, and 70%), and one unknown solution were determined. If the densities of 20%, 50% and 70% solutions are 0.69 and 0.58 and 0.49 g/mL, respectively, and the denisty of the unknown

    asked by alayna on June 17, 2013
  18. chemistry

    The molarity of an aqueous solution of barium hydroxide is determined by titration against a 0.335 M nitric acid solution. If 32.8 mL of the base are required to neutralize 21.5 mL of nitric acid, what is the molarity of the barium hydroxide solution?

    asked by Anonymous on April 1, 2014
  19. Math

    1. what is the solution o 204 - (-36)? A 240** B - 240 C 168 D -168 2. what is the solution of 87 + (-396)? A 183 B -183 ** C 9 D -9 3. Evaluate: -12 x 3 =? A 36 B -36** C 4 D -4 4. Evaluate: -20 ÷ -10 =? A 200 B -200 C 2 **8 D -2 5. Select all the

    asked by Caroline on September 12, 2016
  20. Chemistry

    You are investigating the effect of strong base on the solubility of zinc hydroxide, Zn(OH)2 (s). (Ksp= 3 x 10- 15 for Zn(OH)2 (s)) You prepare 1.0 L solution of 0.10M NaOH and add excess zinc hydroxide, Zn(OH)2 (s). Instead of suppresing the solubility,

    asked by Lily on April 27, 2016
  21. Chemistry

    What is the vapor pressure of a solution prepares by dissolving 4.25g of K2O in enough water to preapare 1.25L of Solution at 25 degrees (C)? Assume that the density of the solution is 1.00 g/mL and that the vapor pressure of pure water is 23.8 torr at 25

    asked by Kayla on December 6, 2016
  22. Sociology

    I'm working on my sociology assignment on American Family. I have to answer questions on how today's american family have changed from watching old and current tv shows that my teacher assigned to us. (The 70's show and Gilmore Girls) Now, I watched some

    asked by THE 70's SHOW!! on April 17, 2012
  23. Chem

    Plese tell me if these are right. A 15.0-mL sample of NaCl solution has a mass of 15.78g. After the NaCl is evaporated to dryness, the dry salt residue has a mass of 3.26g. Calculate the following concentrations for the NaCl solution. a. %(m/m)= 3.26 x 100

    asked by Jason on November 7, 2010
  24. AP Chemistry

    This questions has 5 parts but I already have the answers for a and b. I need help on the last three parts. In an electrolytic cell, a current of 0.250 ampere is passed through a solution of a chloride of iron producing Fe(s) and Cl2(g). a) write the

    asked by anonymous on April 24, 2007
  25. Chemistry Question

    A 500-mL aqueous solution of NaCl was electrolyzed for 15.0 minutes, producing Cl2 gas at the anode. If the pH of the final solution was 12.15, calculate the average current used. (hint: what products are produced at the cathode?) A. 3.8 A B. 2.2 A C. 0.47

    asked by M on March 29, 2012
  26. Chemistry

    Nitrate salts containing metal ions with the following electron configurations are added to water to make a solution. Predict whether the salt solution will be colored or colorless and explain the reasoning. a. [Kr]4d10 b. [Ar]3d3

    asked by Anonymous on November 19, 2013
  27. Chemistry Question (currents)

    A 500-mL aqueous solution of NaCl was electrolyzed for 15.0 minutes, producing Cl2 gas at the anode. If the pH of the final solution was 12.15, calculate the average current used. (hint: what products are produced at the cathode?) A. 3.8 A B. 2.2 A C. 0.47

    asked by M on March 29, 2012
  28. chemistry

    The solid oxide of generic metal M is added to 75 mL of water and reacts to produce a basic solution that is 0.20 M in the resulting compound. Neutralization of the solution required titration with 27 mL of 0.56 M HCl. How many valence electrons must M

    asked by ellie on March 2, 2013
  29. chemsitry

    1)100ml sample of solution that is 0.2M in both Naf and Hf has 4.0 ml of 1.0M hcl added to it. calculate the ph change of this soultion .ka =7.2*10^-4 2)40 ml of 0.32M benzoic acid if titrated with 60 ml of 0.2 M naoh. clacilate the ph of the resulting

    asked by Anonymous on March 4, 2012
  30. chemistry

    1)100ml sample of solution that is 0.2m in both Naf and Hf has 4.0 ml of 1.0m hcl added to it. calculate the ph change of this soultion .ka =7.2*10^-4 2)40 ml of 0.32m benzoic acid if titrated with 60 ml of 0.2 m naoh. clacilate the ph of the resulting

    asked by Anonymous on March 4, 2012
  31. 8th grade

    Dear Sir, I have question related to Acids and Alkalis is that;- You are given a colourless solution.Describe three tests you would carry out to determine the solution is an acid or an alkali without tasting or using indicators. Please reply me quikly

    asked by Fatima on September 26, 2008
  32. Pre Cal

    Let P be the point on the unit circle U that corresponds to t. Find the coordinates of P and the exact values of the trigonometric functions of t, whenever possible. (If there is no solution, enter NO SOLUTION.) 4ð = ( , ) sin(4ð) = cos(4ð) = tan(4ð) =

    asked by Karmen on February 9, 2010
  33. chemistry

    Precipitation Reactions is the title of the section the problem is A solution of sodium hydroxide is added to a solution of iron (II) chloride. My Net ionic equation was OH- + Fe+2 -> Fe(OH)2 I want to know if my answer is correct and why OH in Fe(OH)2 is

    asked by Selenee on September 30, 2009
  34. The Curriculum

    Which of the following is not part of negotiating a conflict? A. Enforcing your preferred solution B. Explaining the reasons behind a suggested solution C. Accepting reasonable disagreement D. Listening to and acknowledging others' rights, opinions, and

    asked by Daniela on September 13, 2014
  35. chemistry

    We're studying acids and bases; the question states that 50mL of 0.1M HNO3 solution is mixed with 25mL of 0.1M NaOH. What is the pH? I thought that I would use the Henderson-Hasselbach equation; but my answer does not match the one give in the solution.

    asked by micole on May 23, 2008
  36. Math

    A large company has a private computer network connecting 300 different sites. Each site is connected to the network independently with a switch that fails with probability 1% on any given day. 1. What is the probability that exactly two of 300 sites lose

    asked by Steven on October 1, 2012
  37. Physics

    Hello, I had a question for physics, and I tried it out, however, I got the wrong answer. The Question:If a rock takes 0.750s to hit the ground after being thrown down from a height of 4.80m, determine the rock's initial velocity. My Work : The formula-

    asked by Abigail on October 12, 2016
  38. Physics

    Hello, I had a question for physics, and I tried it out, however, I got the wrong answer. The Question:If a rock takes 0.750s to hit the ground after being thrown down from a height of 4.80m, determine the rock's initial velocity. My Work : The formula-

    asked by Abigail on October 11, 2016
  39. math

    Decide whether the each equation has one solution, no solutions,or infinitely many solutions. 1. 2(x-3)= 2X A.One solution B.No solutions C.Infinitely many solutions 2. 3(y-3)= 2y-9+y A.One solution B.No solutions C.Infinitely many solutions 3. 10x-2-6x =

    asked by jake on December 17, 2014
  40. Chemistry-please help

    Hi, I have a queestion on Gas Chromatography(GC). The following were injected into the GC systemk: - 1) 1% sample solution in acetone 2) a 500 times dilution of item 1) The retention time of the main peak in the diluted sample solution 2) shifted by ~

    asked by jess on September 18, 2011
  41. Biology

    Using a special balloon that is permeable to water but not sucrose to make an "artificial" cell. The balloon is filled with a solution of 20% sucrose and 80% water and is immersed in a beaker containing a solution of 40% sucrose and 60% water. The solution

    asked by KJack on February 4, 2012
  42. Thank you Jiskha Teachers

    I just wanted to say thank you jiskha teachers for helping me get through 8th grade. My last day of school was yesterday and I'm going on to highschool next year. Thanks for helping work out, check, or help me solve any problems I couldn't get through, you

    asked by Jordan on June 2, 2018
  43. Math help

    You buy clothing at a sale. You buy sneakers at 2/3 of their original price of $60, a sweater at 7/10 of its original price of $35, and a jacket at 5/6 of its original price of $45. Answer each question and show all your work. a. How much money did you

    asked by Sammy on January 27, 2013
  44. Math algebra

    David Robertson works as a chemical engineer for U.S. peroxide Corporation. David has 2500 gallons of commercial-grade hydrogen peroxide solution that is 60% pure hydrogen peroxide. How much distilled water(which is 0% hydrogen peroxide) will David need to

    asked by Selena on November 9, 2016
  45. chemistry

    @20*C solubility - 22g CuSO4 / 100g H2O @40*C solubility - 42g CuSO4 / 100g H2O which is saturated and unsaturated a. @20*C is 6g CuSO4 / 25g H2O b. @20*C is 30g CuSO4 / 150g H2O c. @40*C is 99g CuSO4 / 250g H2O please show work thanks

    asked by Boo Boo on November 24, 2012
  46. Algebra

    Can you please verify if I did this problem correct. I need to solve for y and then X. Whatever the solution is, I should take the difference of the two numbers. Please let me know if this is correct...I thank you 8x -11y = 170 -6y + x = 49 8x -11y = 170

    asked by Lucille on December 11, 2016
  47. Physics

    Given a square of sidelength a = 4 cm. We place a charged particle at each corner, three of them carry + 2 nC of charge and one carries the same amount of negative charge. What is the magnitude of the electric field at the center of the square? I read a

    asked by Sandra on February 6, 2010
  48. Managerial finance

    Your company contemplates buying a computer based inventory management system for 200 000. It will depreciated on a straight line basis to zero over its 4 year life span, when it will be sold for 30 000. the system will save the firm 60 000 pre-tax (EBIT)

    asked by Shay on August 7, 2018
  49. very hard math question Help

    Accoring to the info below, calculate the invoice total please show all your work and explian thanks ________________________________________ Customer Invoice ________________________________________ Stock# Quant Unit Item Uniit Price 24795 150 ea

    asked by Anonymous on November 9, 2007
  50. Physics

    A 0.50-kg mass is placed on the end of a vertical spring that has a spring constant of 75 N/m and eased down into its equilibrium position. (a) Determine the change in spring (elastic) potential energy of the system. PEs=1/2kx^2=1/2(75)(0.5)^2=9.375 (b)

    asked by Court on December 14, 2016
  51. Physics

    You have setup an experiment with two 50g masses attached to strings that are connected on opposite sides of a scale that measures weight in Newtons. a.) What is the reading on the scale? b.) The whole system is now moving to the left at a speed of 10m/s.

    asked by Tim on November 25, 2012
  52. Biology

    Imagine that you have a stock solution with a concentration of 4.6 M glucose (C1). You want to use the stock solution to prepare a diluted solution of 0.22M glucose (C2). You need a total volume of 10mL of 0.22M glucose (V2). What volume of water you need

    asked by Marco on September 20, 2015
  53. Chemistry

    Imagine that you have a stock solution with a concentration of 4.6 M glucose (C1). You want to use the stock solution to prepare a diluted solution of 0.22M glucose (C2). You need a total volume of 10mL of 0.22M glucose (V2). What volume of water you need

    asked by Marco on September 20, 2015
  54. Chemistry

    A solution is prepared by dissolving 15.6 g ammonium sulfate in enough water to make 100.0 mL of stock solution. A 10.00 mL sample of this stock is added to 52.00 mL of water. Calculate the concentration of ammonium ions and sulfate ions in the final

    asked by Anonymous on May 4, 2010
  55. Algebra

    Use composition of functions to show that the functions f(x) = 5x + 7 and g(x)= 1/5x-7/5 are inverse functions. That is, carefully show that (fog)(x)= x and (gof)(x)= x.

    asked by Alicia on July 29, 2009
  56. CHEMISTRY TITRATION Q

    The titration of 25.00mL of Ba(OH)2 solution with an aqueous solution of 0.500 M HCl reaches an end point when 30.20 mL of the HCl solution is added. Determine the concentration of M of the Ba(OH)2 solution. Soo 25.00mL=0.025L 30.20mL= 0.0302L moles= MxL

    asked by LISA on December 15, 2010
  57. chemistry

    Which of the following statements about boiling points are true? A. The boiling point of 0.1 m NaF(aq) is lower than the boiling point of 0.1 m methanol(aq). B. The boiling point of a 0.5 m aqueous solution of LiOH is the same as the boiling point of a 0.5

    asked by Anonymous on April 18, 2013
  58. History

    Did I understand this question? Explain the pragmatic, political measures Eisenhower used to manage the economy. Explain the politics of consensus. Eisenhower managed the economy by taking a stands that focused on the problem and how to solve it in the

    asked by Ronda on May 13, 2008
  59. physics

    A) What is the minimum speed, relative to the Sun, necessary for a spacecraft to escape the solar system if it starts at the Earth's orbit? B) Voyager I achieved a maximum speed of 125 000 km/h on its way to photograph Jupiter. Beyond what distance from

    asked by jean on May 30, 2007
  60. Physics

    A wheel and axle arrangement has an axle with a diameter of 25cm. A rope is wrapped around the axle and is supporting a load of 2 tonnes. 1)If the mechanical advantage of the system is 30, determine the diameter of the wheel. ANSWER = m 2)Determine the

    asked by Danny on May 20, 2013
  61. Lincoln College Of New En

    The percentage of physicians who are women is 27.9% in a survey of physicians employed by a large university health system, 45 of 120 randomly selected physicians were women. Is there sufficient evidence at the 0.05 level of significance to conclude that

    asked by Paula on April 26, 2013
  62. Physics

    Block A in the figure weighs 48.0N . The coefficient of static friction between the block and the surface on which it rests is 0.250. The weight w is 6.00N and the system remains at rest. -Find the friction force exerted on block A. -Find the maximum

    asked by Julia on March 8, 2014
  63. math

    Farmer Brown needs to fertilize his hay pasture before spring arrives. He knows that the perimeter of his pasture is 1000 feet and that the width is 200 feet. If one bag of fertilizer will cover 5000 square feet, how many bags of fertilizer does Farmer

    asked by reet on May 13, 2019
  64. Science

    In which way does the circulatory system rely on the skeletal system? Glucose is secreted by compact bone as an energy source for blood. Spongy bone stores minerals needed by blood cells. Bones provide a source of oxygen to blood. Blood cells are produced

    asked by Anonymous on May 6, 2014
  65. physics

    A 300 kg boulder is dragged 8 m across level ground with a chain that makes an angle of 37° with the horizontal. If the applied force on the chain is 800 N and there is a coefficient of friction of 0.20, find (a) the work done by the applied force, (b)

    asked by zuqndorpchfj on June 26, 2015
  66. chemistry

    following equilibrium system with a Kc of 1.23E-03: C3H6O (aq) + 2C2H6O (aq)--> C7H16O2 (aq) + 2H2O (l) pleas check to see I answer these correclty.. 1.Is this an endothermic- or exothermic reaction, as written?answer: Exothermic 2.How would the

    asked by cateye on April 23, 2012
  67. Physics

    A certain spring has a spring constant of 165 N/m. A 20kg mass is attached to the end of the spring. While the mass is at the equilibrium position, it is given a velocity of 8m/s downward. What is the total energy of the system, and aacceleration of the

    asked by Philip on November 19, 2012
  68. Chemistry

    A .682 g sample of an unknown weak monoprotic acid, HA, was dissolved in sufficient water to make 50mL of solution and was titrated with a .135 M NaOH solution. After the addition of 10.6mL of base, a pH of 5.65 was recorded. The equivalence point was

    asked by Sara on May 9, 2007
  69. ALGEBRA

    Do I place the following two equations on the same line as they both represent the same lines. Pleas show. Thanks much. 3x-2y=8 6x+4y=16 I am sorry I am not too big on graphing. no they are not the same line. because if you had reduced 6x+4y=16---> you

    asked by DANIELLE on January 8, 2007
  70. physics help!!

    a wheel of radius R rotates making f revolutions per second. the quantity f is know as the frecuency of the motion. show tha 1/f is the time to complete one revolution, called the period T of the motion. show that the centripetal acceleration of a point at

    asked by katy on November 8, 2010
  71. physics

    A closed auditorium of volume 27100 m^3 is filled with 2210 people at the beginning of a show, and the air in the space is at a temperature of 292 K and a pressure of 1.013·10^5 Pa. If there were no ventilation, by how much would the temperature (in K) of

    asked by maria on January 1, 2012
  72. art history

    Using Durer’s engraving "Knight, Death and the Devil" discuss what aspects of Durer's style show his interest in the concerns of Italian Renaissance artists and what aspects show that his roots are in the painting and printmaking traditions of northern

    asked by Dana on April 4, 2008
  73. grammar

    Choose the best answer: 1. The L-1, along with the L-3 and L-4, ( show, shows, showing ) some sign of degeneration. Answer: show 2. She did not know (whom, who, whomever) to see about the recurrent congestion. Answer: who 3. The patient's physician

    asked by Leslie on May 12, 2011
  74. physics

    a wheel of radius R rotates making f revolutions per second. the quantity f is know as the frecuency of the motion. show tha 1/f is the time to complete one revolution, called the period T of the motion. show that the centripetal acceleration of a point at

    asked by katy on November 8, 2010
  75. physics

    A closed auditorium of volume 27100 m^3 is filled with 2210 people at the beginning of a show, and the air in the space is at a temperature of 292 K and a pressure of 1.013·10^5 Pa. If there were no ventilation, by how much would the temperature (in K) of

    asked by linda on January 7, 2012
  76. Socials

    Imagine that you are a factory owner in eighteenth-century britain. Write a letter from an employer's point of view to a friend explaining why you think child labour is important to the economy and why it is undesirable to improve working conditions.

    asked by Sara on November 29, 2009
  77. physics

    A pair of sleds weighs 25kg and experiences a frictional force of 25N. If a dog team applies a 175N force pulling it 12m. 1. Find the work done by friction 2. Find the work done by the dog team 3. Find the net work done I need to compare my answers so the

    asked by Anonymous on May 29, 2014
  78. Physics - angular acceleration

    An object rotates about a fixed axis, and th angular position of a reference line on the object is given by THETA(t)=0.4e^2t, where THETA is in radians, and t is in seconds. [a.] what is the object's angular acceleration at t = 2 s? ..this is my work so

    asked by COFFEE on April 8, 2007
  79. Physics

    A 100 lb block of ice slides down an incline 5.0 ft long and 3.0 ft high. A worker pushes up on the ice parallel to the incline so that it slides down at constant speed. The coefficient of friction between the ice and the incline is 0.10. Find (a) the

    asked by Emily on March 11, 2015
  80. Physics

    A 100 lb block of ice slides down an incline 5.0 ft long and 3.0 ft high. A worker pushes up on the ice parallel to the incline so that it slides down at constant speed. The coefficient of friction between the ice and the incline is 0.10. Find (a) the

    asked by Emily on March 12, 2015
  81. Physics

    A 100 lb block of ice slides down an incline 5.0 ft long and 3.0 ft high. A worker pushes up on the ice parallel to the incline so that it slides down at constant speed. The coefficient of friction between the ice and the incline is 0.10. Find (a) the

    asked by Emily on March 11, 2015
  82. Algebra

    2(0.5-3y) + y > (4y-0.2)8 I understand how to solve the problem, but my final answer was y < -17/155, which I have a strange feeling isn't right. Maybe I tripped up somewhere. Here's my work: After distributing: 1-6+y>32y-1.6 +6 to each side 1 +y > 32y +

    asked by Faith on January 22, 2009
  83. Math

    Solve using Determinants and Cramer's Rule? I was absent and missed the lecture on Cramer's rule and Determinants and have no idea how to start the homework.. The directions and problem are as follows: Using Cramer's Rule, set this problem up to find "a".

    asked by Euphoria on November 30, 2010
  84. Pre Cal.--Check my work?

    Solve the system of equations: x - y - z = 2; x + 2y - 2z = 3; 3x - 2y - 4z = 5? well, you have: 1- x-y-z=2 2- x+2y-2z=3 3- 3x-2y-4z=5 multiply both sides of the equation 1 by 2: x-y-z=2 ===> 2x-2y-2z=4 add this by equation 2: 2x-2y-2z=4 x+2y-2z=3 ==> 3x -

    asked by David on March 30, 2009
  85. 7th grade acc math prevents

    How do I show on a hundred grid what 18% of 520 is? I know what the answer is but don't know how the grid can help me find the answer and that is what the teacher wants us to show. Thanks in advance!

    asked by Ardine on January 6, 2014
  86. College Math

    a)Consider the formula n (A U B) = n (A) + - n (A ¿ B). (a) Show that this relation holds for A = {1, 2, 3, 4} and B= {2, 4, 5, 6, 7, 8} (b) Make up your own two sets A and B, each consisting of at least six elements. Using these two sets, show that the

    asked by Vonsell on February 26, 2009
  87. Maths

    A polynomial g(x) is given by: g(x) = (x-1)(x+2)(x-a)(x-b) 1) Given that g(0)=4 show that ab=-2 2) given also that g(3)=40 show that a+b=1 3) given that a and b are integers, give possible values for a and b. My answers 1) g(0) = (-1)(2)(-a)(-b) = -2ab

    asked by Anonymous on October 15, 2015
  88. Math

    My watch is 1 second fast each hour, and my friend's is 1.5 seconds slow each hour. Right now they show the same time. When will they show the same time again? !!!!!!!!I NEED THIS BY TOMORROW!!!!!!!! HELP

    asked by Angle 101 on November 11, 2007
  89. math

    Show the net of each solid and a diagram showing the net of each solid with broken lines to show where each fold should be made

    asked by Osheen on April 6, 2016
  90. Algebra 2

    Hello! I was wondering if someone could tell me if the solution to this problem is identity or no solution. The problem is 4n+5=6r+7 and I think the solution is n=3/2r+1/2 is it an identity or no solution? Thank you so very much for your help!

    asked by Cheryl on October 25, 2016
  91. Math

    Why can't 3x+2xy+8 be a linear system? Why Can't x^2+y^2=4 be a linear system?

    asked by Hannah on December 16, 2017
  92. Science

    What is an example of a stable system? How were you able to determine whether or not this system is stable?

    asked by Young Lil G on May 17, 2017
  93. algerbra

    Consider the following system of equations. y = 4x - 4 y - 4x = 3 What can you conclude about the system of equations?

    asked by robert on September 1, 2014
  94. Science

    What is an example of a stable system? How were you able to determine whether or not this system is stable? I really appreciate your help!

    asked by blackbeltninja on May 2, 2016
  95. economics

    ABC Machinery produces ice machine with historical (monthly) data in the Excel file. Please construct its short-run total cost function to answer the following questions: QUESTIONS 1. Given the data, please construct a Short-Run total cost (TC) function

    asked by Dede on October 29, 2010
  96. sixth grade math

    Find the percent of each number. 1. 5% of 220 files Answer is 110 2. 360 kilometers is 24% of ___ kilometers. Answer is 864. 3. At a shelter, 15% of the dogs are puppies. There are 60 dogs at the shelter. How many are puppies? Answer is 25 puppies Can

    asked by Stephon on November 13, 2014
  97. statistics/calculus

    e^(10)-e^(10-x)-x/(e^(10)-11)=0.25 and e^(10)-e^(10-x)-x/(e^(10)-11)=0.75 -Solve both for x. -Can you solve both of these for x without a Ti-89 calculator? If so how? -The reason I want to calculate this is to find upper and lower quartiles of a deformity

    asked by John on September 27, 2012
  98. physics

    Consider point charges + Q and +9Q, which are separated by 12 meters. At what point, on a line between the two charges, would it be possible that the electric field would be zero. A. There is no such point possible B. 9 meters from the +Q charge C. 9

    asked by TJ on July 21, 2009
  99. science 1 question

    In which way does the circulatory system rely on the skeletal system? A. Glucose is secreted by compact bone as an energy source for blood. B. Spongy bone stores minerals needed by blood cells. C. Bones provide a source of oxygen to blood. D. Blood cells

    asked by SkatingDJ on February 3, 2015
  100. physics

    Two children (m = 34.0 kg each) stand opposite each other on the edge of a merry-go-round. The merry-go-round, which has a mass of 1.60 ✕ 10^2 kg and a radius of 1.6 m, is spinning at a constant rate of 0.34 rev/s. Treat the two children and the

    asked by Anonymous on April 18, 2018

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