1. Pre-Algebra Calculus

    NEED HELP PLEASE Mixture Problems 1.Joe created a metal containing 40% platinum by combining two other metals. One of these other metals weighed 12 lb. and contained 45% platinum. If the other weighed 3 lb. then what percent of it was platinum? 2. 12 gal.

    asked by michele on January 23, 2016
  2. Chemistry

    Sorry about that The chemical 5-amino-2,3-dihydro-1,4-phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood. Luminol is so sensitive that it can detect blood that has been

    asked by HELP PLEASEEE on February 11, 2009
  3. Physics(Please respond)

    1) A roller coaster (398 kg) moves from A (3.82 m above the ground) to B (29.4 m above the ground). Two non-conservative forces are present: friction does -1.82 x 104 J of work on the car, and a chain mechanism does +5.49 x 10^4 J of work to help the car

    asked by Hannah on June 2, 2012
  4. General Physics I

    A 50-N force acts on a 2-kg crate that starts from rest. When the force has been acting for 2 s the rate at which it is doing work is: I found this question online so I saw the answer is 2500 Watts. What I don't understand is how to come to this

    asked by VitaX on October 13, 2010
  5. Chemistry

    An aqueous antifreeze solution is 40.0% ethylene glycol (C2H6O2) by mass. The density of the solution is 1.05 g/cm3. Calculate the molality, molarity, and mole fraction of the ethylene glycol. molality I actually can do this whole problem EXCEPT for one

    asked by Kyle on November 30, 2015
  6. math

    At the end of Summer, Puss discovers that his radiator antifreeze solution has dropped below the safe level. If the radiator contains 4 gallons of a 25% antifreeze solution, how many gallons of pure antifreeze must he add to bring it up to a desired 50%

    asked by Anonymous on March 27, 2016
  7. Math

    1. Which number is the resolution of m + 90 = 150? a. 50 b. 60 (my answer) c. 140 d. 240 2. Which number is the solution of n/3 = -12? a. -36 b. -4 (my answer) c. 4 d 36 3. Use mental math to find the solution of 19b = 190. a. 10 b. 11 c. 171 (my answer)

    asked by Rylee on November 5, 2016
  8. chemistry

    No precipitate formed when an aqueous solution of NaCl or Na2SO4 was added to the sample solution. A precipitate formed when the sample solution was made basic with NaOH. Which ion(s) are present in the sample soluiton? [Hg2]2+ [Ba]2+ [Mn]2+ I know that

    asked by Christie on October 8, 2007
  9. chemistry

    How do you find the mass of a solution if you have 1L of 2.5 M MgCl2. I have determined how many moles are present in MgCl2 which was 2.5 and how grams are present which came out to be 238.025g Now I'm asked "What is the mass of the solution and the mass

    asked by Jenna on March 3, 2011
  10. math

    x/5 + y/6=5 2x/5 + y/3=-2 use sub method

    asked by angel on October 9, 2011
  11. math

    what does method mean

    asked by devin on May 23, 2011
  12. computers

    What overriding philosophy of the Windows 8 operating system makes it unique compared to earlier Microsoft operating systems? A. It is a universal operating system for all types of devices. B. It can host both 32- and 64-bit applications. C. Up to 192

    asked by sab on March 5, 2014
  13. Math

    Suppose that the amount of algae is a pond doubles every 3 hours. If the pond initially contains 70 pounds of algae, how much algae will be in the pond after 9 hours? Is the answer 560? I was not sure how to set it up, but doubled it every 3 hours. If this

    asked by Jane on March 6, 2012
  14. precalculus

    analyzethe graph of the function Find the x- and y-intercepts. (b) Determine the end behavior: find the power function that the graph of f resembles for large values of |x|. (c) Find the maximum number of turning points. (d) Graph the function Please show

    asked by kawn on November 11, 2011
  15. Improving Writing- REVISED VERSION

    Background Ten years ago, you started working as a clerk for DMD Medical Supplies. Six months ago, Liz Jakowski, the human resources director, promoted you to office manager. You manage two employees: Jack Snyder and Ruth Disselkoen. Your office provides

    asked by Camilla on December 4, 2014
  16. Trig!

    The identities cos(a-b)=cos(a)cos(b)sin(a)sin(b) and sin(a-b)=sin(a)cos(b)-cos(a)sin(b) are occasionally useful. Justify them. One method is to use rotation matricies. Another method is to use the established identities for cos(a+b) and sin (a+b).

    asked by Elle on September 27, 2011
  17. graphing

    Can someone show me how to solve these inequalties for me? I cannot figure any of them out -6 < x and 3 < 6 (Remember this is an "and" statement) -3x < -6 or x + 5 < -2 x - 2 > 2x + 1 or -10 > -2x - 2 First of all, the first problem makes nonsense. The

    asked by mike on May 18, 2007
  18. Chemistry

    (a) The solubility of bismuth iodide (BiI3) in water is 4.891 x 10-3 M. Calculate the value of the solubility product. The dissolution products are Bi^3+ (aq) and I^- (aq). (b) Do you expect the solubility of (BiI3) in 0.1 M NaCL (aq) to be equal to,

    asked by Chemgam on January 11, 2013
  19. Math

    sumiko is allowed to watch no more than 10 hours of televisione ach week she has watched 4 hours of television already. write and solve an inequality to show many more hours of television sumiko can watch 10≤4+h

    asked by Coleson on September 23, 2014
  20. Data Structure and Algorithms in Java

    A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. On the other hand, a composite number is a natural number greater than 1 that is not a prime number. For example, 5 is prime, as only 1 and 5 divide

    asked by ahmad on March 31, 2017
  21. Physics

    An ideal gas in a moveable piston is allowed to reversibly expand by slowly heating at constant pressure. a. Derive the equation for the work done reversibly as a function of the initial and final temperatures.( i have used w=-nrtln(v final/v intial) i

    asked by Carlos on February 28, 2017
  22. chemistry

    List the balanced net ionic equations for all reactions that you observed in this experiment. Use your observations to provide evidence for all successful reactions completed and products formed. Where applicable, list ions in their coordination complex

    asked by gine on October 23, 2012
  23. 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
  24. m116

    How do you know if a value is a solution for an inequality?How is this different from determining if a value is a solution to an equation? If you replace the equal sign of an equation with an inequality sign, is there ever a time when the same value will

    asked by Shelly on May 20, 2008
  25. Math (Algebra)

    How do you know if a value is a solution for an inequality? How is this different from determining if a value is a solution to an equation? If you replace the equal sign of an equation with an inequality sign, is there ever a time when the same value will

    asked by Kaylee on October 1, 2009
  26. Algerbra

    How do you know if a value is a solution for an inequality? How is this different from determining if a value is a solution to an equation? If you replace the equal sign of an equation with an inequality sign, is there ever a time when the same value will

    asked by Stacy on December 16, 2009
  27. math

    How do you know if a value is a solution for an inequality? How is this different from determining if a value is a solution to an equation? If you replace the equal sign of an equation with an inequality sign, is there ever a time when the same value will

    asked by Anonymous on October 1, 2009
  28. Chemistry

    50 Ltr. Of a certain liquid is confined in a piston system at the extenal pressure 100 atm this pressure suddenly released and liquid is expanded against a contant atm pressure , vol. Of liquid increases by 1 Ltr and the final pressure of the liquid is 10

    asked by Sam on December 1, 2015
  29. Chemistry

    I have to solve this combustion problem using Dimensional Analysis and molar heat: 2 C2H6 +7O2 yields 4 CO2 + 6H2O + 3120 kJ The question is to discover how much heat is produced along with 8 moles of water in this reaction. My problem is that I have no

    asked by Narasaq on June 3, 2009
  30. Fluid Mechanics

    A circular disc having a diameter of 125cm is immersed in water so that the distance of its perimeter measured vertically below the water surface varies between 60cm and 150cm. Find the total force due to the water acting on one side of the lamina, and the

    asked by Claire on October 31, 2010
  31. math

    Please show me how to solve: Brenda drove three times as far as Jan. Brenda drove 24 miles more than Jan. How far did Jan drive?

    asked by kelley on August 29, 2016
  32. Chem!!

    Consider the dissolution of CaCl2: CaCl2(s) -----------> Ca2+(aq) + 2Cl-(aq) ΔH=-81.5 kJ/mol An 11.0 gram sample of CaCl2 is dissolved in 125 g water with both substances at 25.0 °C. Calculate the final temperature of the solution assuming the solution

    asked by Bob on November 2, 2011
  33. CHEMISTRY

    An ethanol-water solution is prepared by dissolving 10.00 ml ethanol C2H5OH (density=0.789g/ml) in sufficient water to produce 100.00 ml of solution with a density of 0.982g/ml. What is the concentration of ethanol in this solution? Expressed as ml.

    asked by ADRIAN on November 13, 2013
  34. chemistry

    Suppose of copper (II) nitrate is dissolved in of a aqueous solution of sodium chromate. Calculate the final molarity of nitrate anion in the solution. You can assume the volume of the solution doesn't change when the copper (II) nitrate is dissolved in

    asked by madison on February 19, 2013
  35. Chemistry

    A solution containing Pb2+ and a solution containing IO3- are poured together and quickly mixed. After mixing, the solution contains 0.0030 M Pb2+ and 0.040 M IO3-. Immediately Pb(IO3)2(s), which has Ksp=2.510-13, begins to precipitate. Calculate the free

    asked by Tanner on March 5, 2012
  36. Advanced Functions/ Precalculus Log

    1. Evaluate 4^(log base4 64) + 10^(log100) 2. Write 1+log(base2)x^3 as a single logarithm 3. Write log(base b)√(x^3 y z^6) 4. Solve log(base 2)x-log(base 2)6=log(base 2)5+2log(base 2)3 5. Solve 3^(2x) = 9(81^x) 6. Solve 3^(2x)=7^(3x-1). Round answer to

    asked by Jessie on December 19, 2013
  37. Chemistry

    This is for a lab about determining the equilibrium constant. Given: 5.00mL of .203M Fe(NO3)3 mixed with 100mL of .00205M KSCN in a .5M HNO3 solvent for both solutions. Resulting absorbance for solution is .315. How can i find the total Fe, [Fe*] and SCN,

    asked by Bob on April 3, 2011
  38. algebra

    solve the system by substitution x+y=9000 .06x+.15y=1215 .06x+.15(x-9000)=1215 .06x+.15x-1350=1215 .21x-1350=1215 x-1350+1214.79 x+2564.79 don't look right? where did I go wrong

    asked by john on September 27, 2015
  39. PLEASE HELP

    A 60.8-kg skateboarder starts out with a speed of 1.84 m/s. He does 90.8 J of work on himself by pushing with his feet against the ground. In addition, friction does -278 J of work on him. In both cases, the forces doing the work are non-conservative. The

    asked by KS on April 22, 2015
  40. Ms.Susy Please Help With Time!!!!!!

    My sub teacher today gave us a time problem on our homework. We haven't worked with time yet so I'm not quite sure I got it right: Ed started work at 8:45 AM. He stopped for lunch at 12:00 PM and went back to work at 12:45 PM. He quit for the day at 6:15

    asked by Candy Corn  on April 23, 2012
  41. PHYSICS PLEASE HELP

    A 60.8-kg skateboarder starts out with a speed of 1.84 m/s. He does 90.8 J of work on himself by pushing with his feet against the ground. In addition, friction does -278 J of work on him. In both cases, the forces doing the work are non-conservative. The

    asked by KS on April 22, 2015
  42. PHYSICS

    A 60.8-kg skateboarder starts out with a speed of 1.84 m/s. He does 90.8 J of work on himself by pushing with his feet against the ground. In addition, friction does -278 J of work on him. In both cases, the forces doing the work are non-conservative. The

    asked by KS on April 22, 2015
  43. physics

    A 64.2-kg skateboarder starts out with a speed of 2.21 m/s. He does 98.0 J of work on himself by pushing with his feet against the ground. In addition, friction does -276 J of work on him. In both cases, the forces doing the work are non-conservative. The

    asked by Cameron on January 11, 2017
  44. Physics

    A 64.4-kg skateboarder starts out with a speed of 2.11 m/s. He does 81.6 J of work on himself by pushing with his feet against the ground. In addition, friction does -289 J of work on him. In both cases, the forces doing the work are non-conservative. The

    asked by P on December 5, 2012
  45. physics

    A 64.2-kg skateboarder starts out with a speed of 2.21 m/s. He does 98.0 J of work on himself by pushing with his feet against the ground. In addition, friction does -276 J of work on him. In both cases, the forces doing the work are non-conservative. The

    asked by Tyler on January 12, 2017
  46. Dr.Bob (thx) Check my work for this one pls

    What is the molar solubility of Sr3(AsO4)2 and the concentration of Sr^2+ and AsO4^-3 in a saturated solution at 25 deg Celsius? The Ksp is 1.3E-18. Show the balanced reaction. Below, I write M.S. (molecular solubility) 1)Sr3(AsO4)2 3Sr^2+ + 2AsO4^-3 M.S.

    asked by Kizner on June 11, 2006
  47. Physics please help

    A 195.0-N sign is suspended from a horizontal strut of negligible weight. The force exerted on the strut by the wall is horizontal. Draw an FBD to show the forces acting on the strut. (Do this on paper. Your instructor may ask you to turn in this work.)The

    asked by Amy on May 21, 2012
  48. maths

    If 6men can do a piece of work in 20 days and one man can do a work of 2 boys.Find how many days can 10 men and 5 boys do the same work ?

    asked by kumar on January 9, 2018
  49. Chem

    A patient has a theophylline serum concentration of 96ng/L after taking theophylline tablet. Given that the half-life of theophylline is 8hr, how long will it take for the serum concentration to reach 50mg/L (assuming the distribution is complete and that

    asked by 123 on October 17, 2017
  50. math

    automoniles arrive at the drive-through windom at a post office at the rate of 4 every 10 minutes. the average service time is 2 minutes. the poisson distributimes are exponentially distributed. (A) what is the average time a car is in the system? (b) what

    asked by mark on June 7, 2011
  51. Physics

    A circular hatch in the hull of a submarine has a radius of 40.0 cm. The submarine is 850.0 m under water. If atmospheric pressure above the ocean is 1.01 x 105 Pa and the air pressure inside the submarine is 1.31x 105 Pa, what net force is exerted on the

    asked by Sally on December 19, 2011
  52. Physical Science

    The air temperature on a certain day is 86 degrees F A)Convert to Celsius? B) Calculate the sound of speed in air? C)When a 653Hz tornado siren is turned on, the sound takes 2.3s to reach an observer. How far is the observer from the main siren, and what

    asked by Charles on March 2, 2014
  53. math help me!

    on he teachers baseball team, they are measuring to put the bases down. ms.accardo wants it like a professiona; field. On a professional baseball field, the distance from one base to the next is 90 ft.what is the distance between home plate and second

    asked by lammy on April 28, 2011
  54. Math

    ^=exponents /= divide So I am not sure how to do this. It is an example in my book but I still don't get it. Can you work through ti so I can do my real work. (-1^2+-1^-2)^-1 (-1^2+-1^-2)^-1 = First, do work within the parentheses. -1*-1 = 1 and -1-2 =

    asked by Gina on November 23, 2006
  55. math

    2/3 of the students watched tv. Of those students 3/4 watched a reality show. Of the students that watched the show 1/4 of them recorded the show. What fraction of the students watched and recorded a reality tv show? not sure what to do, thinking we need

    asked by cavan on September 17, 2014
  56. Algebra

    Solve the quadratic equation. 3x^2-15x+18=0 I know that the formula to quadratic equation is x=-b+and-(square root)b^2-4ac divided by 2a. I know that a=3, b=-15 and c=18, then subsitute in and get two answers, my problem is that I keep getting an answer

    asked by Lexie on April 22, 2010
  57. Chemistry

    What will be the final temp. of the solution in a coffee cip calorimeter if a 50.00mL sample of 0.250 M HCL is added to a 50.00 mL sample of 0.250. The initial temp. is 19.50 °C and the Delta H is -57.2 Kj/mol NaOH assume density of solution is 1.00 g/mL

    asked by Jordyn on April 5, 2017
  58. Chemistry

    One mole of each of the following compounds is added to water in separate flasks to make 1.0 L of solution. Which solution has the largest total ion concentration? a. aluminum hydroxide b. silver chloride c. sodium chloride d. calcium carbonate e.

    asked by Sam on May 9, 2011
  59. Chemistry

    Calculate the pH of the following buffer solutions: a) a solution made by dissolving 2.733g KH2PO4 and 4.508g K2HPO4 in water to give 250 ml of solution. b)a solution made by mixing 35.00 ml 0.24 M C6H5NH2 with 15.00 ml 0.19 M C6H5NH3CL. The base

    asked by Karie on February 8, 2012
  60. hrm

    How do I design a reward system ( an employee reward system)

    asked by Dehlia Silva on February 2, 2008
  61. Science

    What is a example of a stable system and how can I determine whether or not this system is stable (please help urgent)

    asked by Nadie on December 16, 2018
  62. mat116

    consider the following system of equations y=3x-7 andy-3x=5 what can you conclude about the system of equations

    asked by csrla on March 2, 2014
  63. Solar Energy

    Consider a 250 Wp rated crystalline silicon PV module. It results from a manufacturing process that consumes 8kWh/Wp of PV module. a) What is the total energy consumed (in kWh) during the production of the module? Assume that the PV module is used in a

    asked by Anonymous on November 14, 2013
  64. Solar Energy Help ASAP

    Consider a 250 Wp rated crystalline silicon PV module. It results from a manufacturing process that consumes 8kWh/Wp of PV module. a) What is the total energy consumed (in kWh) during the production of the module? Assume that the PV module is used in a

    asked by Anonymous on November 13, 2013
  65. math

    A rocket is fired into the air with an initial velocity of 98 m/s. The height ( h ) of the rocket after t seconds is given by the expression h = 98t - 4.9t2. a. What the average rate of change over the first 2 seconds. b. At what point does the rocket

    asked by sdtvds on October 30, 2018
  66. chemistry help

    sulfuric acid is a strong acid and dissociates in water as shown in reaction H2SO4(aq)=2H^+(aq)+SO4^2-(aq) what is the hydrogen ion concentration, in mol dm^-3,when 1.50g of sulfuric acid is dissolved in water to give 0.500dm^3 of solution ?show all of

    asked by zak on December 30, 2012
  67. Physics

    A child pushes a toy box 4.0m along the floor with the force of 6.00 N directed downward at an angle 37 degrees to the horizontal. a. How much work does the child do?" b. Would you expect more or less work to be done if the child pulled upward at the same

    asked by stefy on September 16, 2006
  68. algebra

    Can someone please help me with these problems? Write (27a^-3)^-2/3 in simplest form. Solve log(6x+11)=2. thanks Let me see your work, we can start from there. Alright! :D (27a^-3)^-2/3 =the cubed root of (27a^-3)^-2 =the cubed root of 27^-2a^6 i figured

    asked by Lillian on June 2, 2007
  69. algebra

    how do i verify a question when i am solving for Y.. yet i need to subsatoute X first to find Y. such as in this probelm to find Y ((xy)/(x+4)-(2y/x)=3 solve for Y i end up with........lets say that X=4 Y= (3x^2+12x)/(x^2-2x+8) Y=6 now how am i supposed to

    asked by breanna on February 7, 2008
  70. Chemistry

    The preparation of "azo" dyes often does not work well in laboratory. Alought the correct colour is usually apparent, very little product is obtained. Seeing this, a student decides to modify the experimental procedure and obtains a record quantity of

    asked by Lucian on October 22, 2006
  71. Algebra

    Essay: Show all work. A gardner wants to create wants to create a triangle garden in the shape of a right triangle with skortesr length x-5yft. and the middle length side x+6yft. what is an algebraic expression for the area of the garden? Be sure to

    asked by Anna&Karen on July 27, 2012
  72. maths

    I need explanation to this question.solve 48 base12 multiply by 15 base12.i can solve it by first converting to base ten and back to base 12,but i need to be able to solve directly in base12.Thanks

    asked by james on September 29, 2015
  73. chemistry

    You need to prepare 500.00 mL of a 0.25 M solution of nitric acid . Concentrated nitric acid comes from the chemical copmanies as a 15.8 M liquid. How much (in mL) of this 15.8 M solution will you need to dilute to 500.00 mL to get the desired 0.25 M

    asked by j on October 4, 2010
  74. Chemistry

    A solution is 40% acetic acid by mass. The density of this solution is 1.049 g/mL. Calculate the mass of pure acetic acid in 460 mL of this solution at 20 C. Answer in units of g.

    asked by Melanie on August 29, 2016
  75. chemistry

    You need to prepare 500.00 mL of a 0.15 M solution of nitric acid . Concentrated nitric acid comes from the chemical copmanies as a 15.8 M liquid. How much (in mL) of this 15.8 M solution will you need to dilute to 500.00 mL to get the desired 0.15 M

    asked by lulu on October 10, 2010
  76. chemistry

    A stock solution of HNO3 is prepared and found to contain 11.1 M of HNO3. If 25.0 mL of the stock solution is diluted to a final volume of 0.500 L, the concentration of the diluted solution is ________ M.

    asked by chanel on February 12, 2017
  77. Science

    what test would you need to perform to prove that it is the combination of glucose in the glucose indicator solution that changes color when heated and not just the glucose or the glucose indicator solution alone. support your anwser with a solution

    asked by Guest on October 14, 2013
  78. Chemistry

    If a solution of formic acid contains 0.2 M HCHO2, 0.006 M CHO2-, and 0.006 M H+, What is the Ka of the acid? What is the ph of the solution at the concentrations given? What would happen to the equilibrium position if more CHO2- were added to the

    asked by Anonymous on July 7, 2014
  79. Chemistry (volume)

    The molarity of a sodium hydroxide solution is 0.2 M. The molar mass of NaOH is 40 g/mol. If 20 g of sodium hydroxide (NaOH) is dissolved in water in this solution, what is the volume of the solution?

    asked by Summer on March 24, 2018
  80. Algebra

    Chandra has 2 liters of a 14% solution of sodium hydroxide in a container. What is the amount and concentration of sodium hydroxide solution she must add to this in order to end up with 7 liters of a 34% solution?

    asked by sara on November 28, 2016
  81. math

    Amit investment $750 at 8.2% per year and $1,300 at 4.9% per year.Both investments earn simple intrest.Whoch investment earns more simple intrest in a year? Show your work.

    asked by chris on April 17, 2012
  82. math

    suppose there are 2 pieces of the cake left over, but you don't know how many pieces were in the whole cake.Explain how you could find the number of pieces in the whole cake if Taylor told you 1/6 of the cake was left.You may show your work in a drawing.

    asked by Derl on April 9, 2014
  83. physics

    A duck is floating on water with 26% of its total volume submerged below the surface. If the duck has a mass of 2.6kg, what is the duck’s total volume? You must show all necessary work, the density of water is 1000kg/m3.

    asked by Joe on November 4, 2012
  84. math

    suppose there are 2 pieces of the cake left over, but you don't know how many pieces were in the whole cake. explain how you could find the number of pieces in the whole cake if taylor told you 1/6 of the cake was left. you may show your work in a drawing.

    asked by renan on January 28, 2014
  85. math

    Suppose there are 2 pieces of the cake left over,but you don't know how many pieces were in the whole cake. Explain how you could find the number of pieces in the whole cake if Taylor told you 1/6 of the cake was left. You may show your work in a drawing.

    asked by molly on April 16, 2015
  86. math

    Bob made a square table top with 100 white square tiles. He painted the tiles along the edge of the table red. How many tiles are red? You must show your work

    asked by mary on March 6, 2012
  87. geomety please help

    the perimeter of a recatngle is 54 inches. The width is one inch less than the lenght. FInd the length and width. I just don't understand how to find the length and width if i am only givent eh perimeter please show work thank you

    asked by jamie on September 14, 2016
  88. math

    Mrs. Rossi wrote the following clus for a mystery 4-digit number. .The tens digit is twice the one digit .The hundreds digit is twice the ones digit. .The ones digit is 3. .The sum of the digits is 19. What is the mystery number? show the work.

    asked by gabriella on November 17, 2010
  89. Math

    Jameka bought a $60.00 necklace on sale for 40% off its regular price. Caitlyn bought an $80.00 necklace for 55% off its regular price. Who paid the least amount for their necklace? Show your work and explain your reasoning

    asked by Mae Falcon - Myers on March 31, 2014
  90. MATH HELP ASAP

    Levi earns $6.25 per hour working after school. He needs at least $143.75 for a stereo System how many hours h does he need to work to reach his goal? A) h/ 6.25 > 143.75;h> 23;23hours*** B) 6.25h(underlined) 143.75;h (>underlined) 23;23hours

    asked by School help on November 30, 2017
  91. science

    Chapter 1 & 2 Review Questions 1. Compare and Contrast the two main branches of physical science. 2. Distinguish between scientific laws and scientific theories. 3. Describe the steps of the scientific method. 4. Explain the objective of a consistent

    asked by jack on December 13, 2010
  92. simultaneous equations

    Solve 2a + b = 3 4a - 5b = 20 My attempt Multiply the first equation by 5 So, 10a + 5b = 15 4a - 5b = 20 Add them together 14a = 35 Divide both sides by 14 a = 2.5 Substitute (I have done it with the second one) 10 - 5b = 20 Take away 10 from both sides 5b

    asked by hs on January 10, 2014
  93. simultaneous equations

    Solve 2a + b = 3 4a - 5b = 20 My attempt Multiply the first equation by 5 So, 10a + 5b = 15 4a - 5b = 20 Add them together 14a = 35 Divide both sides by 14 a = 2.5 Substitute (I have done it with the second one) 10 - 5b = 20 Take away 10 from both sides 5b

    asked by hs on January 10, 2014
  94. Chem

    Calculate the concentration in mol per litre of ammonium ions in a solution solution prepared by mixing 360.0mL of 0.250 mol per litre ammonium sulphate solution with 675.0mL of 1.20mol per litre ammonium nitrate solution. Assume solution volumes are

    asked by atriletz on January 27, 2007
  95. Chemistry

    References Chapter 17: EOC Assume you dissolve 0.178 g of the weak acid benzoic acid, , in enough water to make mL of solution and then titrate the solution with 0.187 M . ( for benzoic acid = .) What was the pH of the original benzoic acid solution?

    asked by Anonymous on April 26, 2016
  96. solutions

    If one solution cotains 10% NaCl and another contains 30% NaCl, the 30% solution is isotonic, hypotonic, hypertonic, plasmolyzed with respect to 10% solution. iso means equal. hypo means less than hyper means more than plasmolyzed was just thrown in to

    asked by Natalie Vega on October 9, 2006
  97. GENERAL CHEMISTRY CALCULATION

    preparing working solution of the disinfectant Osyl from the stock solution requires diluting the stock one part Osyl to five parts water .this is V/V solution .in this situation you have 250ml of water so the question is:HOW MUCH OSYL IS NEEDED?

    asked by see eel on July 1, 2011
  98. math

    A chemist has 30%, 40 % and 80 % acid solutions. All three were to be mixed to make 4.00 x 102 L of 38% acid solution but a mistake was made and the amounts of 30% and 80 % were reversed. The result was 4.00 X 102 L of 65 % acid solution. What were the

    asked by David on November 17, 2012
  99. math

    The solutions to a quadratic equation are 3/8 and 2/5. Write the quadratic equation in standard form show all appropriate work. (standard equation: f(x)=a(x-h)^2+k)

    asked by shannon on September 25, 2008
  100. Math

    A bag of jellybeans weighs 2 1/4 pounds. 1/5 of the jellybeans in the bag are black. How much do the black jellybeans weigh? (SHOW ALL WORK)

    asked by Reyna Aureolus on November 26, 2018

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