Questions Asked on
April 6, 2010

  1. chemistry

    For each trial, enter the amount of heat gained by the chemical system of ammonium nitrate, qrxn. The specific heat of water is 4.184 J/goC. Report your answer using 4 digits. The information given is: Trial # Tiwater Tf Masswater #1: 21.2 10.8 24.990 #2:

    asked by Megan
  2. chemistry

    Tetraphosphorus trisulphide (P4S3) is used in the match heads of some matches. It is produced in the reaction 8P4+3S8 --> 8P4S3. Determine which of the following statements are incorrect, and rewrite the incorrect statements to make them correct. a. 4 mol

    asked by Ana
  3. Chemistry

    Identify the species oxidized and the species reduced in each of these redox equations A. 3Br2 + 2Ga -> 2GaBr3 B. HCL + Zn -> ZnCl2 + H2 C. Mg + N2 -> Mg3N2

    asked by Anonymous
  4. physics

    a 600N person picks up a 180 N suitcase positioned so that the suitcase's center of gravity is 20cm lateral to the location of the person's center of gravity before picking up the suitcase. if the person does not lean to compensate for the added load in

    asked by justine
  5. Physics

    A projectile is shot straight up from the earth's surface at a speed of 1.20×104 KM/HR. How high does it go?

    asked by Michael
  6. Physics

    Mars rotates on its axis once every 24.8 hours. What is the altitude of a geosynchronous satellite orbiting Mars. I have the speed of geosynchronous orbiting Mars. But I cant find the altitude of a geosynchronous satellite orbiting Mars.

    asked by Hoa
  7. Algebra

    Between what two consecutive integers is each square root of 139?

    asked by Chloe dawgg :)
  8. Chemistry

    A student is given a sample in lab which contains one of the ions listed below. After adding a few drops ofsolution to part of the unknown sample, the student got a greyish precipitate. After adding a few drops ofsolution to another part of the unknown

    asked by Sam
  9. Chem

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

    asked by AMI
  10. Chemm

    A 2.00L flask is filled with propane gas(C3H8)at 1.00atm and 15C. What is the mass of propane in the flask?

    asked by Courtney
  11. physical chemisry

    Estimate the freezing point of 150 cm3 of water sweetened with 7.5g of sucrose (C12H11O22). (Kf for water is 1.86 K kg mol-1; density of water is 1gcm-3)

    asked by Anonymous
  12. Chem

    3O2(g)---> 2O3(g) At a given instant, the reaction rate in terms of [O2] is 2.17x10^-5 mol/L*s. What is it in terms of O3?

    asked by Mike
  13. pyhsics

    A 1kg projectile is fired at 10m/s from a 10kg launcher. The momenta of the projectile and the launcher have the same magnitude, but opposite directions. Show that the KE of the projectile is 10 times gerater that the KE of the recoiling launcher. KE =

    asked by sherri
  14. Math

    A satellite is launched into orbit 200 kilometers above the Earth.The orbital velocity of a satellite is given by the formula v=√GmE/r, where v is the velocity in meters per second, G is a given constant, mE is the mass of Earth, and r is the radius of

    asked by Macy
  15. statistics

    A statistics professor receives an average of five e-mail messages per day from students. Assume the number of messages approximates a Poisson distribution. What is the probability that on a randomly selected day she will have five messages?

    asked by Suphaluck
  16. Chemistry

    A 22.44g sample of iron absorbs 180.8J of heat, upon which the tempature of the sample increases from 21.1 C to 39.0 C. What is the specific heat of iron?

    asked by Camarra
  17. physics

    A butterfly at eye level is 22 cm in front of an plane mirror. You are behind the butterfly, 46 cm from the mirror. What is the distance between your eye and the image of the butterfly in the mirror?

    asked by mika
  18. physcis

    Seals may cool themselves by using thermal windows, patches on their bodies with much higher than average surface temperature. Suppose a seal has a 0.030 m^2 thermal window at a temperature of 30 degree C. If the seal’s surroundings are a frosty -10

    asked by Kidda
  19. phYsics

    Two identical objects each hold a net charge of q = 8e. If the gravitational force between the two objects exactly cancels the electrostatic force between the objects, what is the mass of each object? Where G: 6.67E-11 Ke=8.99E9 I know the equation is

    asked by echem
  20. physics

    Suppose a fixed cannon is to fire a projectile at an enemy tank, which is moving toward the cannon at a speed of 15 mph. If the cannon is to fire at the moment the tank is 3 miles from the cannon and the muzzle speed of the cannon is 1100 mph, what is the

    asked by drew
  21. Physics

    A rock is dropped of the side of a bridge and hits the water below 4s later. a. What was the rock’s velocity when it hit the water? b. What was the rock’s average velocity as it fell? c. What is the height of the bridge above the water?

    asked by Jackie
  22. Calculus

    How do you find the derivative of: y= 2sinx cosx

    asked by Wayne
  23. Chemistry

    The value of H° for the reaction below is -482 kJ. Calculate the heat (kJ) released to the surroundings when 12.0 g of CO (g) reacts completely.

    asked by Camarra
  24. pre-calculus

    What is the polar form of the equation 3x - 4y = 12? The answer is r = 12/ (3cosx - 4 sinx) (x = theta) I don't know how to get the answer though.

    asked by Jamie
  25. chemistry

    Five kg of ice cubes are moved from the freezing compartment of a refrigerator into a home freezer. The refrigerator's compartment is kept at -4.0 celsius. the home freezer is kept at -17 celsius. How much heat does the freezer's cooling systeam remove

    asked by evelyn
  26. Physics

    A projectile is shot straight up from the earth's surface at a speed of 1.20×104 km/hr. How high does it go?

    asked by Zack
  27. English

    need some advice! My learners will work on a text next week.In the text are 7 new words. The aim of the lesson is to learn those words and practice them in a few ways. What can I do to practice those new words. Any interesting ideas from your own

    asked by refy
  28. algebra

    how many different pizzas can be made if a pizza shop has 6 meat toppings, 5 vegetable toppings, and 3 cheese toppings to choose from using 1 of each on each pizza?

    asked by julie
  29. Physics

    It has been suggested that rotating cylinders about 10 mi long and 5.6 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acceleration at its surface equals the free-fall

    asked by Alexander
  30. Chemistry

    For which one of the following reactions is the value of H°rxn equal to H°f for the product?

    asked by Camarra
  31. Chemistry

    In the reaction: NaOH + HCl --> NaCl + H2O how many moles of water are produced when 1 mole of HCl is neutralized by 1 mole of NaOH?

    asked by Anonymous
  32. Chem

    What molarity of a NH4NO3 solution has a pH of 5.220? Kb for NH3 is 1.8 x 10^-5. Choose one answer. a. 6.31x 10-6. b. 2.21 x 10-6 c. 5.56x 10-10. d. 0.065 I started by taking the inverse log of the PH to get (6.02*10^-6) then I was thinking its not the way

    asked by AMI
  33. physics(check my answer)

    can you tell me what i did wrong on this problem Rigid rods of negligible mass lying along the y axis connect three particles. The system rotates about the x axis with an angular speed of 3.30 rad/s. 4kg,y=3.00m 2kg,y=-2.00m 3kg,y=-4.00m a)Find the total

    asked by phys
  34. physics

    A container holds 1.1 g of oxygen at a pressure of 7.40 atm . How much heat is required to increase the temperature by 110 degree C at constant pressure? How much will the temperature increase if this amount of heat energy is transferred to the gas at

    asked by Kidda
  35. Calculus

    A company is increasing production at the rate of 25 units per day. The daily demand function is determined by the fact that the price (in dollars) is a linear function of q. At a price of $70, the demand is 0, and 100 items will be demanded at a price of

    asked by John
  36. Macroeconomics

    Suppose the money supply is currently 500 billion and the Fed wishes to increase it by 100 billion. Given a required reserve ratio of .25, what should it do?

    asked by Debbie
  37. Chemistry

    What are all the possible lewis structures for SCN-? Including the formal charges to all atoms.

    asked by Max
  38. Math

    A company is increasing production at the rate of 25 units per day. The daily demand function is determined by the fact that the price (in dollars) is a linear function of q. At a price of $70, the demand is 0, and 100 items will be demanded at a price of

    asked by Alex
  39. chemistry

    Strontium-90 has half-life of 28 years. if a 1.00-mg sample was stored for 112 years. what mass of Sr-90 would remain?

    asked by bob
  40. English

    1. There are a lot of clubs in my school. 2. There are a lot of clubs in our school. (Are both correct? Can we use 'our' instead of 'in'?) 3. I study a lot of subjects like mechanics, ethics, and social studies. 4. I study a lot of subjects such as

    asked by rfvv
  41. Science Helpers

    My science post is almost at the bottom and I need it to be checked urgently. I see science helpers on this site as of right now.--Can you please have a moment to look at my Science post. Thank you very much in advance:-)

    asked by Sara
  42. English literature

    what are the didactic elements of morality play "Everyman"

    asked by heranda
  43. differential equation

    a four -pound weight stretches a spring 8 inches from its natural lenght . the weight is pulled downward an additional 6 inches and released with an initial upward velocity of 8 feet per second . find a formula for the position of the weight as a function

    asked by Anonymous
  44. chem

    3. Determine the density of chlorine gas at 22C and 1.00 atm pressure.

    asked by Courtney
  45. Chem

    Calcaulate the pH after 10.0 mL of 0.40 M HCl is added to 20.0 mL of 0.50 M NaOH. I wasn't sure on how to start this problem. I tried to break the HCl and NaOH apart then I set up ICE for each but I did get the wrong answer of 13.70. a. 0.40 b. 13.70 c.

    asked by AMI
  46. Physics

    Mercury has a density about 13.6 times that of water. How high could you raise a column of mercury by increasing pressure to 8.2 kPa?

    asked by Plaster
  47. Science

    True or False? Density is another property of matter True???

    asked by Keen
  48. chemistry

    What are several reasons why the actual yield from a chemical reaction is not usually equal to the theoretical yield?

    asked by John
  49. Chem

    2. Carbon monooxide CO is product of incomplete combustion of fuel. Find the volume that 42g of CO gas occupies at STP

    asked by Courtney
  50. Physics

    The masses of 1 mole of various gases are as follows: hydrogen about 2 grams, helium about 4 grams, nitrogen about 28 grams, oxygen about 32 grams and carbon dioxide about 44 grams. On the average how fast does a molecule of each gas move at 333 Celsius?

    asked by Benny
  51. Physics

    Two objects attract each other gravitationally with a force of 2.1×10−10 N when they are 0.21 M apart. Their total mass is 4.00 KG Find their individual masses. .

    asked by mm
  52. Physics

    What is the difference in blood pressure between the head and feet of a person of height 171 cm?

    asked by Noodle
  53. Math

    Write 67 hundredths as a percent. a) 670% b) 67% c) 0.067% d) 0.67% D???

    asked by Keen
  54. Precalculus

    PLEASE HELP!! Solve: 1. cos(arcsin(4/5))= ?? 2. tan(arccos(4/5))= ?? 3. cos(arctan(3))= ?? Note: Give exact answers!!

    asked by jh
  55. calculus optimization

    a company manufactures large cylindrical drums.the bottom and sides are made from a metal that costs $4.00 a square foot, while the reinforced lid costs $6.00 a square foot. ind thedmensions ofa drm that hasa volume of 10cubic feet and minizes the total

    asked by MILEY
  56. physics

    The masses of 1 mole of various gases are as follows: hydrogen about 2 grams, helium about 4 grams, nitrogen about 28 grams, oxygen about 32 grams and carbon dioxide about 44 grams. On the average how fast does a molecule of each gas move at 333 Celsius?

    asked by Plaster
  57. Chemistry,

    I reall need help, i know what formulas to use i just don't know how to do it. Can some one please work with me to get to the correct answer? 1.The air in a dry, sealed 2L soda bottle has a pressure of 0.998 atm at sea level at a temperature of 34C. what

    asked by Courtney
  58. 4 Grade

    About how many people lying head-to-toe are needed to strech around the earth? Is it closest to : a) 1 million; b) 25 million; c) 100 million? (Hint: The distance around the earth is approximately 25,000 miles).

    asked by Nina
  59. math

    it takes a 40 lb turkey two hours to cook. Tom baked his own turkey that was 1/5 the size of a 40 lb turkey. How long will it take for Toms turkey to bake ?

    asked by Alexander
  60. math

    A passenger in an airplane flying at an alti- tude of 14 kilometers sees two towns directly to the left of the plane. The angles of depres- sion to the towns are 30◦ and 52◦. How far apart are the towns? Answer in units of ft.

    asked by Carter
  61. geometry

    A CIRCLE HAS AN AREA OF 50 SGUARE FEET.WHAT IS THE APPROXIMATE DIAMETER OF THE CIRCLE?ROUND TO THE NEAREST WHOLE FOOT.

    asked by KYLE
  62. chemistry(check my work)

    The initial concentration for the compounds involved in the reaction shown were determined to be [CS2(g)] = 1.075 mol/L, [H2(g)] = 1.436 mol/L, [CH4(g)] = 0.6740 mol/L, [H2S(g)] = 0.3120 mol/L. Calculate the value of the equilibrium constant (Kc) at 1175 K

    asked by bme1
  63. chemistry

    How many moles of acid were present in 50 ml or 1.0M HCl? How many moles of water were produced in this reaction?

    asked by Kate
  64. chemistry

    how many moles of water are produced from the combustion of 3.5 mol of hydrogen and 5.2 mol of oxygen

    asked by juanita
  65. English

    1. He has lunch at 12:00. 2. He has lunch at 12:00 p.m. 3. He has lunch at 12. 4. He has lunch at 12 p.m. 5. He has lunch at noon. (Are all grammatical?) 6. He goes back home at 15:30 p.m. 7. He goes back home at 15:30. 8. He goes back home at 3:30 p.m. 9.

    asked by rfvv
  66. Chemistry

    How do you calculate the amount of a radioactive substance remaining after an integral number of half-lifes have passed?

    asked by Tristan
  67. Math

    Sue has $400 in her savings account. If the bank pays her 6 1/2% interest, how much interest will Sue earn? a) $260 b) $29.50 c) $26 d) 312 C???

    asked by Keen
  68. Physics

    A particle of mass m moving at 5 m/s in the positive x direction makes a glancing elastic collision with a particle of mass 2m that is at rest before the collision. After the collision, m moves off at an angle of 45 degrees to the x axis and 2m moves off

    asked by Lauren
  69. algebra

    2+i/3-i

    asked by mada
  70. Chemistry

    I have to write a bunch of atomic symbol for these isotopes and I don't understand how to I do it. (a) atomic number=53, number of neutrons=79 I looked at the periodic table for 53 so the element is Iodine. So They gave the atomic number and I have the

    asked by SC
  71. physics

    Water is descending in a vertical pipe of diameter 7 cm and open to the atmosphere. At a lower point the water flows into a smaller pipe of diameter .84 cm. At a certain instant the depth of the water just above the narrowing point is 30 cm and the water

    asked by Benny
  72. college

    Needs help with writing a thesis statement about depression within teen suicide.

    asked by April
  73. College Chemistry

    How many orbitals have the following quantum numbers: n=6, l=2, ml=-2?? a. 0, b. 5, c. 7, d. 10, e.6 Since only one can include n=6 in its equation would it make it just one orbital having those numbers? im also thinking that there might be other orbitals

    asked by James
  74. pure math 30

    the graph y=x^3-4x^2+x+6 is stretched horizontally by a factor of 2 about the line x=4. what is the resulting equation

    asked by natasha
  75. chemistry(just to double check)

    The initial pressure for the compounds involved in the reaction displayed were determined to be P(SO2(g)) = 0.5932 atm, P(O2(g)) = 0.4886 atm, P(SO3(g)) = 0.09287 atm. Calculate the value of the equilibrium constant (Kp) at 1000 K if the equilibrium

    asked by bme1
  76. Physics Help Please!

    If the price of electrical enegy is $0.10 per kilowatt *hour, find the cost of using electrical energy to heat the water in a 12.0m * 9.00m * 1.5m swimming pool from 15 degrees C to 27 degrees C. So the change in temperature is 285.15 , the volume is

    asked by Dave
  77. chemistry(check my work)

    Which of the following is NOT true of colligative properties? Colligative properties are... A. dependent on the mass of solute present. B. independent of the chemical identity of the solute. C. dependent on the molar mass of the solute. D. responsible for

    asked by eng
  78. Chemistry(defintions)

    I need help on finding the definitions to these: Pressure being constant, the amount of heat in a chemical equation ___________. Randomness of particle measurement is called __________. Calories required to convert 1gm of liquid to vapor without a change

    asked by Bill
  79. Physics

    Water is descending in a vertical pipe of diameter 7 cm and open to the atmosphere. At a lower point the water flows into a smaller pipe of diameter .84 cm. At a certain instant the depth of the water just above the narrowing point is 30 cm and the water

    asked by Noodle
  80. 6th grade

    Kara has a diamond ring. Her ring has a volume of 6cm(to the third power) and a mass of 2g. What is the density of her ring? INCLUDE UNITS!

    asked by kEVIN
  81. philosophy

    • Write a persuasive, formal letter (750-1000 words) to a specific Continental philosopher featured in chapter 8. In the letter, describe the key ideas of that philosopher’s views, and then provide a critique of his or her views. Which of his or her

    asked by john
  82. Science-Urgent

    I did an experiment on a burning candle, and I need help with some of the questions. Thank you very much in return. Please no websites.--more information would be appreciated, thanks:-) I'll list everything of what we went through. Materials: -1 standard

    asked by Sara
  83. math

    there are 500 seats in the auditorium. A concert was playing there and 1/5 of the seats were not filled. All the other seats that were filled cost $5.00 a piece to sit in. HOw much money was made in concert tickets ?

    asked by Alexander
  84. physics

    A fluid in an insulated, flexible bottle is heated by a high resistance wire and expands. If 9 kJ of heat is applied to the system and it does 5 kJ of work, how much does the internal energy change?

    asked by nish
  85. math

    for numbers less than 40, list each pair of numbers that has a greatest common factor of 12???

    asked by Anonymous
  86. us history

    The "real heart" of the progressive movement was the effort by reformers to

    asked by Anonymous
  87. ALGEBRA

    Find the vertex, the line of symmetry, the maximum or minimum value of the quadratic function. f(x) = -2x^2 + 2x + 9 x coordinate is y coordinate is the equation of the line of symmetry is x = Maximum/minimum of f(x) is the value, f (1half) = 19 over 2

    asked by GGIFT
  88. math

    find the equation (in standard form using only integers) for the line through (2, -5) that is parallel to 2x-3y=5

    asked by Garrett
  89. calculus

    A) How do you prove that if 0(

    asked by Sarita
  90. Physics

    Use Bernoulli's equation to determine the velocity with which water will exit from a hole in a uniform cylinder when the cylinder is filled to a point 3.1 meters above the hole, assuming that the water in the cylinder moves with negligible velocity.

    asked by Plaster
  91. physics

    There is a small amount of water at the bottom of a sealed containerof volume 4.3 liters which is otherwise full of an ideal gas. A thin tube open to the atmosphere extends down into the water, and up to a height of 238 cm. The system is initially a

    asked by Noodle
  92. math

    Money is invested at two rates of interest. One rate is 8% and the other is 2%. If there is $1000 more invested at 8% than at 2%. Find the amount invested at each rate if the annual interest from both investments is $310. Let x amount invested at 8% and y

    asked by jerson
  93. math

    Prove that the limit as n approaches infinity of ((n!)^2)/(2n)! is 0. I'm thinking that you have to use the squeeze theorem, but I'm not quite sure how. help please?

    asked by Roy
  94. com/150

    Formatting Academic Papers Crossword Puzzle Exercise

    asked by tony
  95. math

    calculate the measures of the point angles of the star-shaped polygons shown. I know you can see the firgure but its 140 degree angle. To measure them do I do 360/140=2.57?

    asked by Alvin
  96. Math (fractions)

    2 8/9 + 1 1/2

    asked by Hi
  97. French

    Is the second verb in a french sentence always in the infinitive (if this is present tense)? For example: Les talons rétractent quand tu promene l'escalier.

    asked by Aly
  98. College Algebra

    state the range of each relation: A. y=absolute value of 2x-3 B. y=the square root of x+1

    asked by Dee
  99. algebra

    Let f(x) =x^2 +2 and g(x)=2x + 1 Find and simplify each of the following bexpressions. a)...f(4) b)...g(a+2) c)...(fog)(2)

    asked by Marsha
  100. Math

    You can roll two dice at a time, a white one and a red one, and there are 36 different ways for the "up faces" to land. How many of ways will give a sum of 7 on the two up faces?

    asked by Mia
  101. Physics

    Air passes over the top of an airplane wing at 235 m/s and over the bottom at 190 m/s. If the wing has area 10 m^2, how much lift results?

    asked by Benny
  102. CHEISTRY

    MAKING SLIME!! 1.WHEN SLIME IS ROLLED INTO LONG 4 IN PIECES AND JERKED FROM TWO ENDS DOES THE SLIME ACT LIKE A SOLID OR LIQUID? i THINK A SOLID BUT WHY? 2. IF YOU PULL SLIME AT TWO ENDS AFTER ROLLED I THINK THE SLIME ACTS LIKE A SOLID BUT I DON'T KNOW WHY?

    asked by DEBBIE
  103. Drbob222

    Are you done helping me? Sorry, to bugg you i just reall need the help.

    asked by Courtney
  104. algebra

    Money is invested at two rates of interest. One rate is 8% and the other is 2%. If there is $1000 more invested at 8% than at 2%. Find the amount invested at each rate if the annual interest from both investments is $310. Let x amount invested at 8% and y

    asked by jerson
  105. College English

    I need help with undersatnding fallies. Example of a sentence to list fallicies: You're either a critical thinker or you're not.

    asked by Sandy
  106. Social Studies

    What happened to Andrew Jackson when he was eight years old?

    asked by Jack
  107. math

    One thousand three hundred and twenty feet are what part of a mile? Answer has to be in lowest terms.

    asked by Anonymous
  108. statistics

    An experimental egg farm is raising chickens to produce low cholesterol eggs. A lab tested 12 randomly selected eggs and found that the mean amount of cholesterol was x = 186 mg. The sample standard deviation was found to be s = 19.0 mg on this group.

    asked by looking for someone to varify my work please
  109. Math

    Could someone please help me with this problem? I need to solve -5/2x greater than or equal to -7/4. Here is the answer that I got but I 'm sure that it is not correct. x greater than or equal to 35/8. Thanks.

    asked by B.B.
  110. vocabulary

    The word "accountable" is best described as...... a. sensible b. hospitable c. laughable d. favorable e.sociable f. responsible Technically I am asking for a definition , but if you can give me the answer...ok! Please help!

    asked by sierra (6th grade)
  111. College Chemistry

    Quick Question - For a spontaneous reaction, ΔS°>0 and K >1. Is this always?

    asked by Whitney
  112. Physics

    There is a small amount of water at the bottom of a sealed containerof volume 4.3 liters which is otherwise full of an ideal gas. A thin tube open to the atmosphere extends down into the water, and up to a height of 238 cm. The system is initially a

    asked by Noodle
  113. Statistics

    Six mice are in an experiment on nutrition and 2 are chosen at random for the control group. What is the probability that the two heaviest mice are chosen for the control group? PLEASE HELP!! This is a review question for an exam I have in the morning!!

    asked by Kassie
  114. English

    I am writing a research paper on Billy Collins' poetry. What are his main themes? I need three... So far I have middle-class American life...

    asked by Sarah
  115. algebra

    2x+2y+2=-18+6y-8

    asked by Carolyn
  116. English

    I'm suppose to identify and label the Subject Compliments, Object Compliments, Direct Objects, and Indirect Objects in each of these sentences. I've got most of them already but I'm having trouble with just a couple. Please Help, 1. Accomplishments have no

    asked by Alex
  117. Statistics

    Five cards are drawn at random without replacement from and ordinary deck of 52. What is the probability all 5 cards are from the same suit?

    asked by Kassie
  118. Statistics

    Show that if A and B are independent events P(A or B)-1 -[1-P(A)][1-P(B)].

    asked by Kassie
  119. ALGEBRA

    give exact and approximate solutions to three decimal places x^2 - 7x + 7 = 0

    asked by GGIFT
  120. ALGEBRA

    solve 3x + x(x-1)=0 and find the y intercepts of f(x)=3x + x (x-1)

    asked by GGIFT
  121. algebra

    solve for x 7+3(1-x)=5-2(3-4x)

    asked by leeee
  122. math

    Can some one help me complete the square in this question? x^2+(13/2)x=13

    asked by jen
  123. math

    The number of tickets sold each day for an upcoming performance of Hanel's messiah is given by N(x)=-0.6x^2+12x+10, where x is the number of days since the concert was first announced. when will daily ticket sales peak and how many tickets will be sold

    asked by jen
  124. algebra maginary numbers

    (3+4i)(3-4i)

    asked by mada
  125. math

    what is 5% OF 20

    asked by endbj
  126. calculus

    Prove that the limit as n approaches infinity of ((n!)^2)/(2n)! is 0. I'm thinking that you have to use the squeeze theorem, but I'm not quite sure how. help please?

    asked by Roy
  127. physics

    A toy rocket is fired off a platform with an initial speed of 223 ft/sec at an angle of elevation of 32 degrees and achieves a maximum height of 291 ft. How how above the ground was the platform?

    asked by drew
  128. algebra

    x^2+225 ..factor over complex numbers?

    asked by mada
  129. Science

    Waste created by man can be classified under Heading X (eg torn book, mouldy bread, rotten apple) and Heading Y (plastic bag, biscuit tin, broken bulb). What is Heading X and Heading Y?

    asked by Jenny
  130. XECO 212

    Locate recent articles in the New York Times or Wall Street Journal in which economists are quoted usingpositive and normative statements. Provide one quote and its context for both a positive and normative statement. Explain your choice.Evaluate the

    asked by James T. Benton Sr.
  131. Chemistry

    Have I balanced this equation correctly CN + NaOCL---OCN + NaCl

    asked by Mel
  132. algerbra 116

    -3 -0 = 0,is this correct,Thank you for yhe help

    asked by renee
  133. Social Studies

    What is a small island off the coast of Syria in the Mediterranean Sea?

    asked by Leah
  134. COM/150

    Need help with some supporting details, and subdetails for my appendix d. My thesis is "Instead of being the solution to larger issues like low self-esteem and depression, cosmetic surgery has become the issue." Can you help with some examples you would

    asked by Nikol
  135. math

    Please help solving this problem. Solve the following word problem: One poll reported that 48% of city residents were against building a new stadium. The polling service stated that the poll was accurate to within 3%. What is the minimum percent of city

    asked by bindiya farswani
  136. Physics

    Marshall applies a constant force of 20N to a box and causes it to move at a constant speed of 4m/s. Show that the work he does in moving the box in 6s is 480J. KE/2v^2=m?

    asked by sherri
  137. choir

    I have been given a piece of music for an audition piece to learn over spring break, it is called Danny boy and i can not exactly get one part correct. How do i get this part?

    asked by Sami
  138. math

    i am a two digit number that falls in between 40 and 50. I can be evenly be divided by the number 5. what number and I ?

    asked by darlene
  139. education

    Children will generally select equipment based on: a.their prior success with the equipment. B.the size of the equipment c.the brightness and boldness of the equipment's colors d. The opportunity for challenge presented by the equipment. My answer is D.

    asked by vanessa
  140. CHEMISTRY

    POLYMER COMPOSITE EXPERIMENT USED GLUE AND THREAD PUT STRIPS OF GLUE THEN ADDED STRANDS OF THREAD ALLOWED TO DRY DID 3 DIFFERENT STRIPS AND LAYED THREAD PARALLEL AND PERPENDICULAR ON ONE 1. I DON'T KNOW WHY THE STRIS THE LONG WAY SEEM STRONGER OR SHOULD

    asked by DEBBIE
  141. math

    Stan bought several clothing items at macys. He bought a jacket for $30.00, a hat for $10.00, and two shirts for $5.00 each. He had a coupon that took 30% off the total bill. He paid with a $50.00 bill and received three of the same types of bills in

    asked by Alexander
  142. algebra

    5x^3

    asked by april
  143. algerbra 116

    After diving 88m below sea level,a driver rises at a rate of 6 meters per minute for 7 min.Where is the diver in relation to the surface?

    asked by renee
  144. MATH

    IS 8 FL OZ ONE CUP

    asked by BOB
  145. Chem

    NaOH + HCl --> NaCl + H2O What is the amount of heat absorbed by water? given: mass: 102.2 grams specific heat: .9601 cal/g degrees C

    asked by Janae
  146. math

    thanks.

    asked by Anonymous
  147. Chemistry

    Which one of the following combinations of reagents will result in a spontaneous reaction? A) Al(s) + CuCl2(aq) B) Al(s) + CaCl2(aq) C) Zn(s) + CaCl2(aq) D) Cu(s) + ZnCl2(aq) I know the answer is A, but what I don't know is why, or how to figure this out.

    asked by Trixie
  148. grd1 math

    2+10= i havent learn how to do a dble digit, how do u do this?

    asked by just wondering
  149. vector geometry

    Suppose a fixed cannon is to fire a projectile at an enemy tank, which is moving toward the cannon at a speed of 15 mph. If the cannon is to fire at the moment the tank is 3 miles from the cannon and the muzzle speed of the cannon is 1100 mph, what is the

    asked by Drew
  150. 9th grade acc. algebra

    how do you do this? this is the full question and all info: "A line with a slope of -3 passes through the point (k,4). Find the y-intercept of the line in terms of k." I would like to know how to do this along with the answer so i can know im doing it

    asked by alyssa
  151. social studies

    What social classes existed in Aryan culture?

    asked by Annie
  152. calculus

    What is the polar form of (3^1/2 - i)? I know r=(x^2+y^2)^1/2 and theta = arctan (y/x) I know r=2, but how do you find theta?

    asked by Jackie
  153. Algebra 3

    how do i use an identity to find the value of the expression sin 1.7 and csc 1.7

    asked by Melysa
  154. Physics

    Assuming that your lungs can function when under a pressure of 11 kPa, what is the deepest you could be under water and still breathe through a tube to the surface?

    asked by Noodle
  155. Science-bobpursley

    Thanks for helping me with al those parts bobpursley. If you have time, can you also check my questions please. Thank you very, very much in return. My post is on the second page.

    asked by Sara
  156. ALGEBRA

    1. Suppose you are an event coordinator for a large performance theater. One of the hottest new Broadway musicals has started to tour and your city is the first stop on the tour. You need to supply information about projected ticket sales to the box office

    asked by GGIFT
  157. chemistry

    why are the equivalence point and the end point different in a titration?

    asked by shelley
  158. chemistry

    25.00 mL of an acetic acid solution requires 23.86mL of a 0.1550M potassium hydroxide solution to reach the end point. What is the molarity of the acetic acid solution? (Hint: write the chemical reaction, and remember stoichiometry)

    asked by shelley
  159. Physics

    use two 100-ohm resistors, two 20-ohm resistors and two 47-ohm resistors in any combination to get any of these currents...... a) I=0.015 A b) I=0.031 A c) I=0.064 A d) I=0.6 A

    asked by Amy
  160. algerbra 116

    -14(x-6=

    asked by renee
  161. Algebra

    Let f(x) =x^2 +2 and g(x)=2x + 1 Find and simplify each of the following bexpressions. a)...f(4) b)...g(a+2) c)...(fog)(2)

    asked by Marsha
  162. Chemistry

    What are all the possible lewis structures for SCN-? Including the formal charges to all atoms.

    asked by Max
  163. algebra

    (3+4i)+(-5+7i)

    asked by mada
  164. math

    there are 30 students in class. 1/5 of the class are girls. how many boys are in the class

    asked by amber
  165. math

    if the length of two sides of an isosceles triangle are 7 and 15, what is the perimeter of the triangle?

    asked by patel
  166. PHYSICS

    what does it mean to be outside the focal point of a converging mirror?

    asked by LU
  167. math

    Can someone please explain this problem to me: I have to use integrals to find volumes with known cross sections but i just don't understand. Thanks! Consider a solid bounded by y=2ln(x) and y=0.9((x-1)^3). If cross sections taken perpendicular to the

    asked by summer
  168. Science

    Explain the feedback mechanisms that maintain homeostasis.

    asked by Ashlee
  169. math 116 algerbra

    -4+(-1)=

    asked by renee
  170. algerbra

    16 less than q, what is the translation?

    asked by renee
  171. multiplication

    3 dights by 3 dights

    asked by alicia
  172. grammar

    My mother and shall or will go to concert tonight.

    asked by Jaslin
  173. Physics

    A wall is made of a substance whose thermal conductivity is .93 J / (m sec Celsius). What is the outside temperature of the wall if its thickness is 30 cm and its cross-sectional area 73 m^2, and if thermal energy flows through the wall at a rate of 30

    asked by Plaster
  174. Physics

    There is a small amount of water at the bottom of a sealed container of volume 5.2 liters which is otherwise full of an ideal gas. A thin tube open to the atmosphere extends down into the water. The system is initially at atmospheric pressure and

    asked by Plaster
  175. math

    Where does the graph y=4x 11 cross the y-axis?

    asked by nikki
  176. biomechanics

    If a kicker produces a torque of 8Nm with her muscles and the resulting angular acceleration of her leg is 20rad/m2, what is the moment of inertia of her leg?

    asked by Jane
  177. Ethics

    HOW HAS THE AMERICAN HISTORY OF AFRICAN SLAVERY INFLUENCED OUR CONTEMPORARY SOCIETY? PROVIDE THREE EXAMPLES YOU BELIEVE TO BE MOST SIGNIFICANT.

    asked by Anonymous
  178. accounting

    Prepare adjusting journal entries for the year ended (or date of) December 31, 2005, for each of these separate situations. Assume that prepaid expenses are initially recorded in asset accounts. Also assume that fees collected in advance of work are

    asked by kim
  179. Biology - Hormones

    What 3 steroid hormones and involved in controlling reproductive function in both non pregnant women and in men

    asked by jess
  180. physics

    I want to confirm if its true if one object is to exert a force on another, then the two objects must be touching or connected by a third object.

    asked by Anonymous
  181. algerbra 116

    -9-(-8)=

    asked by renee
  182. Global history

    How did agricultural advancement impact society?

    asked by Katherine
  183. accounting

    Explain each step of the accounting cycle. Describe at least one transaction that would occur at the company you selected in each of these steps.

    asked by Anonymous
  184. algerbra 116

    I am thinking that -9-(-8)= -1 ,is this the correct answer?

    asked by renee
  185. Math

    Use the given information to solve the triangle. If two solutions exists, find both. A=110 degrees a=125 b=100 a is greater than b so I think that there is only one triangle. I am not sure where to go from here.

    asked by Abbey
  186. Natural sciences

    Does any steel float or zink in water

    asked by Kgaume
  187. phyics

    convert 36cm/min to km/h

    asked by alisha
  188. chemistry

    I was trying to do a balanced reaction equation to show cyanide being oxidized by hypochlorite ion to cynate. I wasn't sure if there needed to be oxygen in the equation too. CN + NaOCl = OCN + NaCl

    asked by Mel
  189. ETH 125

    How has the American history of African slavery influenced our contemporary society? Provide three examples you believe to be most significant.

    asked by Sharon Page
  190. Math

    The lesson that I am working on is called mathematical induction. The only problem is that the lesson was not explained very clearly due to a problem with the recording so I have no idea how to complete this problem. Find p k+1(This is little under the p)

    asked by Abbey
  191. language arts/research paper topic

    i myself need a third idea to do a research project on as a 7th grade advanced english student so far i have abusive teenage relationships , and anastasia romanov

    asked by ali
  192. health

    Have patients who cannot assist in suicide a right to voluntary active Euthanasia? This is a question I am not sure how to answer except no. I say this because of Jack Koverkion helping person with suicide with deadly disease went ot prision. can anone

    asked by april
  193. Bus Law 201

    Gavin, an 18 year old sudent was eating lunch on the grounds of a school. He threw a half- eaten apple toward the outside wall of a classroom some distance way. The apple sailed through a slowly closing door and struck a teacher who was in the room. The

    asked by Jackie
  194. geometry

    okay, if I have a square, and know the square footage-how can I find the middle of that square? I can't figure this out for the life of me.

    asked by Rick
  195. Economics

    o Which government bodies influence national fiscal policies that potentially affect the housing market? I am thinking the federal reserve but I am really unsure about that answer.

    asked by Bridget
  196. science

    Are humans both creaures and creators of their personal and social worlds?

    asked by john
  197. math

    what do you get when you cross a stick of dynamite with a lemon pie?

    asked by sam
  198. physics

    if two vehicles moving at a same speed and direction and a bullet is fired perpendicularly from one vehicle to a particular point on the another vehicle, would the bullet hit accurately?

    asked by sovon
  199. Geometry

    If hexagon A is similar to hexagon B and hexagon B is similar to hexagon C, then what conclusion can be drawn? What property does this illustrate?

    asked by Cameron
  200. science

    whats the celstial sphere?

    asked by Arora
  201. math

    there are 40 marbles in a jar. Chris had 2/5 of the marbles, Sal had 1/8, Tim had 1/10, and Bob, John and Don split whatever was left over evenly. How many marbles did Bob, John and Don split ?

    asked by Alexander
  202. math 221

    1. Using Excel, find the z-score that corresponds to the following Confidence Levels: a. 80% b. 85% c. 92% d. 97% 2. Using Excel, find the t-score that corresponds to the following Confidence Levels and Sample Sizes: a. 95% with n = 25 b. 96% with n = 15

    asked by megan
  203. Physical science

    If the reading on a electric meter was 2345 kilowatt-hour and the next mouth was 3456 , how much electrical energy was used ?

    asked by Gwen
  204. algebra

    Solve each inequality. State the solution set using interval notation and graph the solution set. 1-x

    asked by Marsha
  205. CHEMISTRY

    TALKING ABOUT EXTRACTING DNA eXPERIMENT: MASH FRUIT UP WITH COLD ISOPROPYL ALCOHOL, SALT, WATER, AND DETERGENT THEN EXTRACT DNA USING A WOODEN SPLINT. WHEN EXTRACTING DNA FROM STRAWBERRIES WHY CAN WE NOT SEE IT IN MASHED UP STRAWBERRIES BUT YOU CAN SEE IT

    asked by DEBBIE
  206. math

    how many liters of water must be added to 30 liters of a 20% alcohol solution to dilute it to a 15% solution?

    asked by Dawn
  207. Physics

    Explain why the pressure at depth h in a stationary fluid is `rho g h.

    asked by Benny
  208. american literature

    name the virtue Benjamin Franklin says gave him the most trouble or where can i find it at

    asked by Anonymous
  209. math

    thomas wants to build a seven layer brick wall. the bottom layer has 20 bricks and each layer of the wall that goes up has two less bricks than the layer below it. if each brick costs .50 cents to cement how money will Thomas spend on the wall ?

    asked by Alexander
  210. math

    Can someone please explain this problem to me: I have to use integrals to find volumes with known cross sections but i just don't understand. Thanks! Consider a solid bounded by y=2ln(x) and y=0.9((x-1)^3). If cross sections taken perpendicular to the

    asked by summer
  211. math

    sean had the following test grades: 50%, 65%, 50%, 45%, 100%. what is the range ?

    asked by Alexander
  212. math

    i am a quadilateral. I have four sides, four angles and only one set of parallel lines. i am not a parallelogram. what am I ?

    asked by darlene
  213. chemistry(check my work)

    The freezing point of a solution is A. lower than the freezing point of the solvent alone because higher temperature is required to accelerate solvent molecular motion enough to overcome obstructon by solute particles.. B. higher than the freezing point of

    asked by eng
  214. Chemistry

    If 0.0308 M aqueous FeCl3 is produced stoichiometrically according to the balanced equation in a reaction solution with a total volume of 1200 mL, what mass (g) of gaseous H2S is produced? Fe2S3(s) + 6HCl(aq) ¨ 3 H2S(g) + 2 FeCl3(aq)

    asked by Adam
  215. DrBob222

    I reponded back to you on my science helpers post.

    asked by Sara
  216. algebra

    Write an equation of the line, in the form of y = mx + b that passes through the given points. 3. (0,5),(-2,0) 5. (1,4),(3,8)

    asked by Anonymous
  217. statistics

    1. The new Twinkle bulb has a standard deviation σ = 34 hours. A random sample of 77 light bulbs is selected from inventory. The sample mean was found to be x= 492 hours. Question: Find the margin of error E for a 90% confidence interval. Round your

    asked by looking for someone to varify my work please
  218. math

    how many liters of water must be added to 30 liters of a 20% alcohol solution to dilute it to a 15% solution?

    asked by Anonymous
  219. physics

    Suppose a fixed cannon is to fire a projectile at an enemy tank, which is moving toward the cannon at a speed of 15 mph. If the cannon is to fire at the moment the tank is 3 miles from the cannon and the muzzle speed of the cannon is 1100 mph, what is the

    asked by Drew
  220. English

    In many works of literature, an individual's encounter with death or destruction ultimately leads to the individual's affirmation of the dignity and worth of human life. What does this quote means and how does this quote relates to Hamlet by William

    asked by Joel
  221. history

    are all countries leaders nationalist? why or why not?

    asked by Anonymous
  222. statistics

    Question: A standard placement test has a mean of 105 and a standard deviation of ó = 13. Determine the minimum sample size if we want to be 99% certain that we are within 3 points of the true mean. Answer: N = ( zc ó/E)^2 = (2.575 x 13/3)^2 = 121

    asked by looking for someone to varify my work please
  223. statistics

    The new Twinkle bulb is being developed to last more than 1000 hours. A random sample of 100 of these new bulbs is selected from the production line. It was found that 48 lasted more than 1000 hours. Find the point estimate for the population proportion,

    asked by looking for someone to varify my work please
  224. math

    Use linear combinations to solve the system 3x − y = −4 −6x + y = 34 The value of x is The value of y is

    asked by Carter
  225. College Algebra

    IS (x-2) a factor of f(x)= -9x^4+16x^3+8x^2-9x+2

    asked by Grecia Chapa
  226. ethics

    Cuddly bear...arent you afraid your professor might be monitoring this site?

    asked by big bear
  227. algerbra 116

    what is a equivalent expression of mn is?

    asked by renee
  228. chemistry

    how do you how do you find the mass of a solution, given the density is 1.022 g/mL.

    asked by Joe
  229. Server 2003

    on a network operating at a Windows 2000 mixed domain function level , which of the following are limitations on converting groups

    asked by John
  230. English

    I'm suppose to identify and label the Subject Compliments, Object Compliments, Direct Objects, and Indirect Objects in each of these sentences. I've got most of them already but I'm having trouble with just a couple. Please Help, 1. Accomplishments have no

    asked by Alex
  231. Chemistry

    When 0.320 moles of NH4Cl is dissolved in 1.00 L of water, the temperature drops by 13.7 degrees C. What is the heat of solution of ammonium chloride? The solution has a density of 1.0012 g/mL and a specific heat of 0.9818 cal/g degrees C.

    asked by adam
  232. English

    I'm suppose to identify and label the Subject Compliments, Object Compliments, Direct Objects, and Indirect Objects in each of these sentences. I've got most of them already but I'm having trouble with just a couple. Please Help, 1. Accomplishments have no

    asked by Alex
  233. Geometry

    BD is a perpendicular bisector of triangle ABC. XZ is a perpendicular bisector of triangle WXY. Triangle ABC is similar to triangle WXY with a scale factor of 1:3. Part I. Find BD, AB, WZ, XZ and WX. Part II. What is the scale factor of the perimeters of

    asked by Jenna
  234. Electronics

    I was wondering if you could help me with understanding how an infrared detector works. It is just a cheap one that comes with an emitter from Radioshack. I can't find any websites that tell me what I want to know. What makes the detector detect infrared?

    asked by Fred
  235. Physics

    Well it's an kinematics project and it involves alot of questions. So here goes the problem: Suppose a football was thrown at an angle of 37 degrees with a velocity of 90mi/hr while leaving a quarterback hand at a height of 6'4" above the ground.

    asked by Vanessa
  236. business math

    The cost of running a business is a combination of items called

    asked by sue
  237. economics

    evaluate to what extent the costumers are likely to be affected by the oligopolistic bahvior of toy retailers in the uk

    asked by neda
  238. statistics

    Of the 300 employees that were surveyed, 200 had college degrees, 50 were single, and 30 were both single and had college degrees. What is the probability that an employee chosen at random is single or has a college degree?

    asked by sam
  239. science

    what is the salary, range, and amount of schooling needed to be an EMT?

    asked by jerson
  240. Math

    Use the given information to solve the triangle. If two solutions exists, find both. A=110 degrees a=125 b=100 a is greater than b so I think that there is only one triangle. I am not sure where to go from here.

    asked by Abbey
  241. Science (Atmosphere)

    What happens to the energy absorbed by Earth's surface and atmosphere? They get radiated back into space as longer wave radiation. Is there anything else I should add to this answer? Thanks.

    asked by John
  242. Statistics

    Suppose X is a normally distributed random variable with the mean u(Mu) and variance sigma^2. Suppose P(X

    asked by Kassie
  243. math

    how many liters of water must be added to 30 liters of a 20% alcohol solution to dilute it to a 15% solution?

    asked by Dawn
  244. algerbra 116

    12(p plus 3)=

    asked by renee
  245. College Algebra

    state the range of each relation: A. y=absolute value of 2x-3 B. y=the square root of x+1

    asked by Dee
  246. Bio

    What the technical name for a children ward in the hospital? something like _____netal. im not too sure.

    asked by Lena
  247. hca210

    long term care

    asked by Anonymous
  248. statistics

    A manufacturer of luxury SUVs is concerned because warranty claims and customer dissatisfaction seems to be on the rise. The manufacturer knows that, based on experience with last year’s model, there is a probability of 4% that a customer will bring back

    asked by sam
  249. ALGEBRA

    determine the nature of the solutions of the equation x^2 - 20 = 0

    asked by GGIFT
  250. Microeconomics

    For a downward-sloping demand curve, marginal revenue decreases as quantity sold increases. True or False?

    asked by L
  251. math

    Can some one help me understand this question please? Give exact and approximate solutions to three decimal places. x^2-7x+11=0

    asked by jen
  252. ALGEBRA

    give exact and approximate solutions to three decimal places. x^2 + 10x + 25 = 1

    asked by GGIFT
  253. ALGEBRA

    solve 3x^2 = 15

    asked by GGIFT
  254. phoenix

    how does the author build his story

    asked by jean
  255. math

    Can someone explain how to label the vertex of this equation. f(x)= -(1/2)x^2. i know how to do these question but when it actually has the other components to the quadratic equation.

    asked by jen
  256. accounting

    I have the postclosing trial balance of the company from the previous month. I also have the AR closing & the AP closing numbers. Do these numbers get transfered into the new month general journal and ledger accounts as balances forward?

    asked by April
  257. math

    do i use the quadratic equation when solving this problem. 3x^2-5x-7=0. If so the answer that i get is (5+-square root of 59)/ 6 is this correct

    asked by jen
  258. math

    solve for x x^2+45=6x. is this like completing the square

    asked by jen
  259. math

    Solve the formula for the given letter. Assume all variables represent nonnegative numbers. a^2+k^2=j^2, solving for a

    asked by jen
  260. math

    how do i find the vertex for this type of problem -2(x+1)^2

    asked by jen