1. algebra

    solve system by substitution 9x-3x=3 3x+8y=-17
  2. Math

    how do you solve a linear system. 7. x-y=8 x+y=-2
  3. algebra

    Please help. Solve the given system of equation. 3x -Y =-7
  4. College Algebra

    Solve the system. 2x+9y=4 6y-2z=1 -4x+4z=0
  5. Algebra 1

    Solve the system by addition. 5x-3y=13 4x-3y=11
  6. Algebra2

    Please me with this thanks What is the solution of the system of equations? 3x + 2y + z =7 5x + 5y + 4z =3 3x + 2y + 3z =1
  7. science please help me

    in classification system what does BASIS mean????????
  8. Math

    Solve the following system of equations. 8x + 5y = -91 3x + y = -21
  9. Math

    Solve the following system of equations. 8x + 5y = -91 3x + y = -21
  10. college algebra

    solve the system 2x+y=-4 -x+y= 2
  11. algebra 2

    Solve the system by graphing 2x+y=4 2x+y=2
  12. math

    Solve the system of equations x + y = 5 x - y = -9
  13. College Algebra

    How to solve this system? x + [(3x-y)/(x^2+y^2)] = 3 y - [(x+3y)/(x^2+y^2)] = 0
  14. math

    solve the system of equations y = x + 4 y = x^2 + 9x +16
  15. College algebra

    Solve the system Y=3x-2 6x-2y=30
  16. science

    what is the problem with not using the metric system
  17. math

    a=b+c-2 a=c-d+9 a=b-d+11 Based on the system of equations above, what is the value of a? a) 2 b) 9 c) 10 d) 11 e) 20
  18. math

    solve the system of equation 5x+2y+z=-25 5x-3y-z=-23 3x+y+2z=-9
  19. College algebra

    Solve the system X=2y+3 3x+4y=59
  20. algebra 2

    if a system of equations has no solution then it is what?
  21. ALEGEBRA

    HOW MANY SOLUTIONS DOES THE LINEAR SYSTEM HAVE? Y=2X+4 Y=2
  22. Math

    Solve the system: p-3q=-1 -5p+16q=5 a. (2,1) b.(3,3) c. (-1,0) d.(5,2)
  23. government

    what does confederate system of the governemnt mean
  24. health

    How is the nervous system used when you eat
  25. math

    What is the value of y in the system shown? y=12x-3 y=-2x+4 Thanks
  26. algebra

    Please help. Solve the given system of equation. 3x -Y =-7
  27. Algebra 2 help!

    What is the solution set to the following system? x+y=3 x^2+y^2=9 a.(0,-3)(3,0) b.(0,3)(-3,0) c.(0,3)(3,0) d.(0,-3)(-3,0)
  28. Algebra2

    what is the solution to the above system of equation 2x + 5y =-4 4x -5y =22
  29. Algebra

    What is the x-coordinate of the solution of the system y=1/3+8 and 2x-y=2?
  30. Algebra

    How do I solve this system using substitution? y = 8 - x 7 = 2 - y
  31. algebra

    how many solutions does the linear system have? x=3 y= -2
  32. math

    solve this system by matrices 2x+3y-z=-8 x-y-z=-2 -4x+3y+z=6
  33. biology

    describe a biological system
  34. math

    how many solutions exist for the following system 3x-6y=12 and 2x-4y=7
  35. math

    Solve the following system of equations: 6x – 3y + 10 = 0 2x + y + 9 = 0
  36. math

    Use the graph below to answer the following question. 1.   Find the slope.  (1 point) 2 – –2 Use the graph below to answer the following question. 2.   Find the slope of the line. Describe how one variable changes in relation to the other.  (1 point) 2; distance ...
  37. Writing Skills Part 3

    1.Under the Library of Congress system,where would you begin to research for books on the legal system of Greece? A.E B.k C.U [ D.G] 2. You've located three books on a topic you're researching for an essay.The first thing you should do in determining if any of these books will...
  38. Computer science

    As a member of the Information Security team at a small college, you have been made the project manager to install an access control system (ACS) in a dormitory. The ACS will automatically unlock the dormitory doors via an electronic proximity reader and integrate with an ...
  39. Computer science

    As a member of the Information Security team at a small college, you have been made the project manager to install an access control system (ACS) in a dormitory. The ACS will automatically unlock the dormitory doors via an electronic proximity reader and integrate with an ...
  40. thermodynamics?

    calculate the number of grams of glycerol, C3H5(OH)3 (MW=92.1 g/mol), that must be dissolved in 520 grams of water to raise the boiling point to 102.00 degrees Celsius. this whole chapter really lost me. delta T = Kb*molality delta T = 2 degrees. Kb = boiling point elevation ...
  41. physics

    The flywheel of a steam engine runs with a constant angular speed of 164 rev/min. When steam is shut off, the friction of the bearings and the air brings the wheel to rest in 1.6 h. I found the constant angular acceleration as 1.71rev/min^2. They also ask you to find What is ...
  42. chemistry

    Assuming 100% dissociation, calculate the freezing point and boiling point of 0.700 mol of AgNO3 in 1.00 kg of water.
  43. chemistry

    How much benzoic acid is still dissolved when 73.53 mL of saturated boiling water is cooled to 20oC. The solubility at 20oC is 0.029g/10mL.
  44. Chemistry

    the difference between the boiling point and the freezing point of pure water at standard pressure is (1)32 K (2)273 K (3)100 K (4)373 K
  45. chemistry

    what is the heat of vaporization if the vapor pressure of liquid water at 25 °C is 23.8 Torr and at a boiling point of 100 °C is 760 Torr.
  46. Chemistry

    the difference between the boiling point and the freezing point of pure water at standard pressure is (1)32 K (2)273 K (3)100 K (4)373 K
  47. Finance

    Firm is contemplating the purchase of a new warehouse inventory management system which will cost 3,600,000 at the end of its 8 year life. The warehouse management system will be depreciated straight line to 300,000 over its 8 year life. It is estimated it will reduce costs by...
  48. Chemistry

    In Zinc blend structure (r[zn2+]+r[s2-]) is equal to? (if edge lenght is a)
  49. grammar

    Would you use the word IS or ARE in the following sentence?: These houses IS/ARE a blend of commerical and residential units. Thanks.
  50. social studies

    What is the term for the process when two cultures blend forming an entirely new culture?
  51. Physics HELP PLEASE

    If 10-kg of ice at 0 degrees Celsius is added to 2-kg of steam at 100 degrees Celsius, the temperature of the resulting mixture is? Use Joules. ANSWER: 40 Specific Heats: Ice = 2060 Steam = 2020 Latent Heats: Water melting = 3.33x10^5 Water boiling = 2.26x10^6
  52. chemistry

    How many water molecules are in the recommended volume of water (1.50L) that should be consume daily?
  53. chemistry

    what volume of water should be weighted out to represent one mole of water molecules at 20 degree C
  54. Chemistry

    When 22.50 mL of 0.500 M H2SO4 is added to 22.50 mL of 1.00 M KOH in a coffee-cup calorimeter at 23.50°C, the temperature rises to 30.17°C. Calculate ΔH of this reaction. (Assume that the total volume is the sum of the individual volumes and that the density and specific ...
  55. Chemistry

    Water had the lowest bp of 100C b/c it has no solute to block the movement which cause to have a lower bp when heated. Water with a solute of sugar has a slightly higher bp of 101C because it has a solute o block off some of the waters movement to the top. Water and salt had ...
  56. Chemistry

    The question is: Hydrogen and oxygen gas combine explosively to produce water. Write a balanced chemical equation for this process. If 10 mol of hydrogen reacted with oxygen, what volume of liquid water could be produced? Is this right for the balanced equation? 4H + O₂...
  57. Calc

    The maker of an automobile advertises that it takes 13 seconds to accelerate from 25 kilometers per hour to 90 kilometers per hour. Assuming constant acceleration, compute the following. The acceleration in m/s^2 The distance the car travels during the 13 seconds
  58. 10 grade

    A 80 slug car runs into a wall while moving at 10ft/s. If the car bounces off the wall with the same speed it struck it with as a result of having been in contact with the wall for .8 second, then find... a)... The initial momentum of the car b)... The final momentum of the ...
  59. algebra - more help please

    A thermometer reading 7 degrees C is brought into a room with a constant temperature of 29 degrees C. If the thermometer reads 15 degrees C after 4 minutes, what will it read in 6 minutes? 11 minutes? So I guess I need to put into newton's law of cooling: u(t) = T + (u sub ...
  60. Math

    A faucet is leaking at a rate of 4.2 milliliter per minute. How many gallons of water does the faucet leak per day? Use 1 L = 0.26 gal. Explain how you solved this problem
  61. math

    based on the area of his flowerbed, a gardener caclulates that he needs to dilute 6 8/14 gallons of fertilizer with water. Should he round 6 8/14 up or down when deciding on the amount of fertilizer he should purchase?
  62. statistics

    In 2005, about 233 million people in the United States were aged 14 or older. They consumed, on average, 2.23 gallons of alcohol per person. use scientific notation to estimate the total number of gallons of alcohol consumed by this age group.
  63. physics please help:)

    A car misses a turn and sinks into a shallow lake to a depth of 8.9 m. If the area of the car door is 0.51 m2, what is the force exerted on the outside of the door by the water? Note: 1 atm = 101.325 kPa. What is the force exerted on the inside of the door by the air, assuming...
  64. physics

    A car misses a turn and sinks into a shallow lake to a depth of 8.9 m. If the area of the car door is 0.51 m2, what is the force exerted on the outside of the door by the water? Note: 1 atm = 101.325 kPa. What is the force exerted on the inside of the door by the air, assuming...
  65. AP Chemistry

    Given: N2O4 (g) « 2NO2 (g) @ 25 degrees celcius, Kc is 5.84 x 10^-3. (A) Calculate the equilibrium concentrations of both gases when 4.00 grams of N2O4 is placed in a 2.00 L flask at 25 degrees celcius. (B) What will be the new equilibrium concentrations if the volume of the ...
  66. Math

    A chemical plant takes in 5 1/2 million gallons of water from a local river and discharges 3 2/3 million directly back into the river. How much water does not go directly back into the river?
  67. physical chemistry

    1.) Calculate delta rH for the freezing of water at one bar and -10 degrees C. The heat capacities are H2O(s)=36.9 JK-1mol-1 and H2O(l)=74.5JK-1mol-1. delta H for freezing of water at 0 degree C is -6602Jmol-1 (assume C is independent of temperature). 2.) Assume the hot brick ...
  68. chemistry

    the density of water at 40c is 0.992g/mL. what is the volume of 1.95 of water at this temperature
  69. Physics

    In an immersion measurement of a boy’s density, he is found to have an apparent weight of 6.86-N when completely submerged in water with lungs empty. The mass of the boy is 68.0-kg in air. The density of water is 1000-kg/m^3. a)Determine the density of the boy; b)Will the ...
  70. math - surface area and volume

    A cylindrical bucket with base 15 cm with water upto a height of 20 cm a heavy iron spherical ball of radius 9cm is drop into the bucket to submerge completely in the water. Find the incrrase in the level of water.
  71. Chemistry Lab+Help

    Okay, basically what we did in the lab was fill up an empty soda can with about 5mL of water, and we had to heat it up to a boiling point. After that we turned the soda can upside down into a beaker with cold water. After a minute or so, the can just snapped in half. I have to...
  72. Physics

    1.A bus travels 400 m between two stops. It starts from rest and accelerates at 1.50 m/s^2 until it reaches a velocity of 9.00 m/s. The bus continues at this velocity and then decelerates at 2 m/s^2 until it comes to a halt. Find the total time required for the journey. 2.A 28...
  73. college

    A tank for storing water is conical in shape, with maximum radius 20 m and maxi­mum depth 15 m. The large, circular end of the tank points vertically upwards and is open to the air. It is known that the volume of water in the tank will decrease at a rate proportional to the ...
  74. MECHANICAL ENGINEERING

    Need help with some engineering math problems? 1. You wish to determine the total system efficiency of your hydraulic press that is powered by an electric motor. The characteristics of the hydraulic press are as follows: •Electric motor utilizes 5 amps under load & 220volts...
  75. Health And Physical Ed

    1. during the exchange of air in your lungs, oxygen is being taken into your bloodstream while this substance is being released microorganisms carbon dioxide*** plasma mucus 2. the gas exchange of oxygen to the bloodstream takes place in what part of respiratory system? ...
  76. science

    Which of the following has a boiling point which does not fit the general trend. NH3 PH3 SbH3 AsH3 I am going with NH3 as i think its to do with "the larger the compound the greater the boiling point"(Vander waals forces) Am I correct?
  77. Physics

    In a fully surfaced submarine, a certain amount of air at temperature T1 is compressed into a tank of volume V at pressure p1 . As this submarine dives deeply, the temperature of the compressed air drops substantially to T2 , whereas the pressure becomes p2 . (a) If the ...
  78. Pre-cal

    Define your variables, write a system of equations, use your calculator to solve the system of equations and answer the problem. A grocer sells milk chocolate at $2.90 per pound, dark chocolate at $4.40 per pound, and dark chocolate with almonds at $5.50 per pound. He wants to...
  79. Accounting

    On January 1, you will purchase a new car. The automobile dealer will allow you to make increasing annual December 31 payments over the following four years. The amounts of these payments are $4,000: $4,500: $5,000: $6,000. On the same January 1, your mother will lend you just...
  80. physics

    A rectangular container measuring 24 cm 48 cm 55 cm is filled with water. What is the mass of this volume of water in kilograms?
  81. physics

    the volume of 50g of a substance is 20 cm^2 if the density of water is 1 g cm^-1 will the object floats or sinks in water.???
  82. Science

    The Body's Transport System 1) Which of the following is not a function of the circulatory system? :Breaks down large molecules*** :Delivers oxygen to body cells :Takes carbon dioxide away from body cells :Fights infection 2) Which of the following explains why the heart is ...
  83. chemistry

    calculate the internal energy change for each of the following. a. one hundred(100.)joules of work are required to compress a gas. at the same time the gas releases 23 J of heat. b. a piston is compressed from a volume of 8.30 L to 2.80 L against a constant pressure of 1.90 ...
  84. Science

    if one cup has a larger volume of water in it than a second cup, which would you expect to have a larger amount of dissolved oxygen (or would it be equal for both)? I would expect more water to dissolve more oxygen. More water dissolves more salt, more water dissolves more ...
  85. chemistry

    Crushing Can: youtube video: /watch?v=SBpqT-u8sjo 1. Explain why the can collapsed using the Combined Gas Law where T1 is the initial temperature of the air inside the can before the can was inverted and T2 is the temperature of the air inside the can after it was plunged into...
  86. chemistry

    Crushing Can: youtube video: /watch?v=SBpqT-u8sjo 1. Explain why the can collapsed using the Combined Gas Law where T1 is the initial temperature of the air inside the can before the can was inverted and T2 is the temperature of the air inside the can after it was plunged into...
  87. Physics

    A body of volume hundred centimetre cube is immersed completely in water contained in a jar containing water. the weight of the jar and the water before immersion was 700 grams. After immersion weight of the jar and the water will be
  88. Rate Constants

    I'm really stuck with this one. Here's the rate law and the data that is needed. I appreciate any help Rate= k[I2]X{[H+]Y[CH3COCH3]Z Trial Volume of 0.0010 M I2 Volume of 0.050 M HCl Volume of 1.0 M acetone Volume of water Temperature (degrees C) Reaction time A 5.0 10.0 10.0 ...
  89. Chemistry

    hydrogen gas is collected over water at a total pressure of 744 mm Hg at 20.0 C. If the volume of the wet hydrogen is 495 mL, what will the dry volume be at standard conditions? I know that you need to subtract the water vapor pressure from the total and I got 726.45 mmHg. (...
  90. Chem

    how do you find the total volume of water total mass of water and density of water?
  91. Physics

    A Carnot engine of efficiency 41% operates with a cold reservoir at 24 °C and exhausts 1290 J of heat each cycle. What is the entropy change for the hot reservoir? Answer in J/K. I keep getting the answer incorrect. Here is the work: Efficiency = 100*(Th- Tc)/Th 41 = 100*(Th...
  92. english

    Which of the following sentences is written correctly? A When properly designed, an automobile can achieve great fuel efficiency. B. When properly designed an automobile can achieve great fuel efficiency. C. When properly designed, great fuel efficiency can be achieved by an ...
  93. language

    Which of the following sentences is written correctly? A When properly designed, an automobile can achieve great fuel efficiency. B. When properly designed an automobile can achieve great fuel efficiency. C. When properly designed, great fuel efficiency can be achieved by an ...
  94. English/ Help

    Which of the following sentences is written correctly? A When properly designed, an automobile can achieve great fuel efficiency. B. When properly designed an automobile can achieve great fuel efficiency. C. When properly designed, great fuel efficiency can be achieved by an ...
  95. Design

    The flow system as shown in the Figure, the centrifugal pump(3500 R.P.M.) is delivering water at 100 gal/min and 70 °F into a boiler operating at a pressure of 35 psig. The water levels in the feed tank and boiler are constant. Because corrosion is expected to be negligible, ...
  96. CHEMISTRY

    1. What is another name for freezing, the opposite of melting? 2. What happens to the boiling point of water when you measure it at high altitudes? 3. What intermolecular forces act in the following: H2PH3 CH3NH2 4. Give an example of an atomic solid?
  97. physics

    The specific heat capacity of steel is 445 Jkg K. How much energy is required to raise the temperature of a 0.410g of kettle which contains 1.2L of water from 20 degrees Celsius to boiling point?
  98. Science

    Which of the following is an example of heat transfer by radiation? A. Wind currents B. a pot of water boiling on the stove C. a bare foot on a hot sidewalk D. a microwave oven heating food I think B? Not sure?
  99. georgraphy

    In the following passage written by a conquistador in 1540, what can you infer about how sick citizens were treated? “No one who was lazy or tried to live by the work of others was tolerated; everyone had to work. Thus on certain days each lord went to his lands and took the...
  100. chemistry

    What weight of H2 at STP could be contained in a vessel that holds 4g of oxygen at STP? First, I used the Ideal Gas Law to find the volume of oxygen at STP, but im not sure what to do from there..
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