Most popular questions and responses by Jan
  1. chemistry

    Copper(II) chloride and lead(II) nitrate react in aqueous solutions by double replacement. Write the balanced chemical equation, the overall ionic equation, and the net ionic equa- tion for this reaction. If 10.27 g of copper(II) chloride react, what is

    asked on February 23, 2014
  2. Statistics

    A popular claim nicknamed "freshman 15" states that many college students gain weight in their freshman year. You are give 95% confidence interval as 55.9% < p < 78.4%. correctly interpret the interval.

    asked on October 16, 2018
  3. Physics

    A 1000-kg car moving east at 80 km/h collides head-on with a 1500-kg car moving west at km/h, and the two cars stick together. (a) Which way does the wreckage move and with what initial speed? (b) How much KE is lost in the collision?

    asked on January 28, 2013
  4. solid mensuration

    in the pyramid shown in the figure , AB=9 in ., BC= 12in ,and BD= 5 in . the three face angle at B are each 90 degree . calculate the three face angles at A and the total surface of the solid.

    asked on January 12, 2015
  5. Math

    Ben has 3 times as many guppies as goldfish. If he has a total of 20 fish,how many guppies does he have

    asked on September 6, 2016
  6. Calculus

    Would someone clarify this for me... Is antiderivatives just another name for intergral and why is intergral of a function is the area under the curve? Antiderivatives is another word for integral. Why area? THink on this...the integral is the sum of all

    asked on September 12, 2006
  7. math

    Why was Jesse James in the hospital?

    asked on February 17, 2010
  8. algebra

    the vertices of quadrilateral EFGH are E(-7,3) F (-4,6) G (5,-3) and H (2,-6) what kind of quadrilateral is EFGH

    asked on May 7, 2013
  9. basic statistics for the behavioral sciences

    there are 80 students enrolled in statistics. (a)you and 11 other earned the same score. what percent of the class received your score? (b)forty percent of the class received a grade of C. how many students received a C? (c) only 7.5% of the class received

    asked on August 27, 2011
  10. Pre-Calculus

    Solve the equation on the interval [0,2pi). 2sin^2x-3sinx+1=0 (2sinx+1)(sinx+1) I don't think I did the factoring correctly. When I multiply it out to double check I get 2sin^2x+3sinx+1

    asked on October 27, 2017
  11. Physics

    You encounter a moving walkway that is 97 m long and has a speed of 2.0 m/s relative to the ground. How long would it take you to cover the 97 m length of the walkway if, once you get on the walkway, you immediately turn around and start walking in the

    asked on February 4, 2012
  12. physic

    1.What is the gravitational force between two trucks, each with a mass of 2.0 x 10^4 kg, that are 2.0 m apart? (G = 6.673 x 10^11 N•m^2/kg^2) 2.Each tire of an automobile has an area of 0.026 m^2 in contact with the ground. The weight of the automobile

    asked on December 17, 2006
  13. Medical Transcription Editing

    'Sensory was intact to light touch proprioception and pinprick.' I marked the prepositions 'was' and 'to' in this sentence and was marked incorrect. Advice please?

    asked on May 15, 2016
  14. Business Statistics

    The U.S. Dairy Industry wants to estimate the mean yearly milk consumption. A sample of 16 people reveals the mean yearly consumption to be 60 gallons with a standard deviation of 20 gallons. a. What is the value of the population mean? What is the best

    asked on July 28, 2013
  15. basic statistics for the behavioral sciences

    (a)on a normal distribution of exam scored, poindexter scored at the 10th percentile, so he claims that he outperformed 90% of his class. Why is he correct or incorrect? Because Foofy's score is in a tail of the distribution, she claims she had one of the

    asked on September 9, 2011
  16. Physics

    A hot-air balloon rises from the ground with a velocity of (2.00 m/s)y. A champagne bottle is opened to celebrate takeoff, expelling the cork horizontally with a velocity of (6.00 m/s)x relative to the balloon. When opened, the bottle is 7.00 m above the

    asked on February 4, 2012
  17. Physics

    A small object of mass 3.50 g and charge -22 µC "floats" in a uniform electric field. What is the magnitude and direction of the electric field?

    asked on February 6, 2010
  18. calculus

    I am given a table that shows the temperature of the water and the days, which looks like this: t(days) W(t) (in Celcius) 0 20 3 31 6 28 9 24 12 22 15 21 the temperature of the water in a pond is a differentiable function W of time t. The table above shows

    asked on December 17, 2006
  19. Grammar

    'The genitourinary exam was unremarkable, with a circumcised !@#$%^&.' Verbs: 'was' and 'with'?

    asked on May 15, 2016
  20. calculus

    Express as a single logarithm ln(a)+1/2ln(b) 2ln4-ln2

    asked on May 1, 2011
  21. Medical Transcription Editing

    'The patient had anorexia though he denied any nausea or vomiting' .. I marked the verb in this sentence as 'denied' but it was marked 'incorrect' .. please help!!

    asked on May 15, 2016
  22. math

    the price p and the quantity x sold of a certain product obey the demand equation p=(-1/3)x + 100 o is < or equal to x < or equal to 300 A) express revenue R as a function of x b) what quantity x maximizes revenue.

    asked on October 5, 2008
  23. algebra 1

    Madison is making a vinaigrette for her catering service using olive oil that costs forty cent per ounce and apple cider vinegar that costs twenty-five cents an ounce.The ideal batch of vinaigrette has 25% vinegar.If she has already combined 3 cups of

    asked on May 9, 2013
  24. math

    LMN have vertices at L(0,4) M(-5,2),and N (2,-2). determine the equation for the perpendicular bisector that passes through MN

    asked on March 18, 2012
  25. physics

    0.50 L of water at 16°C is poured into an aluminum ice cube tray of mass 0.250 kg at the same temperature. How much energy must be removed from this system by the refrigerator to turn the water into ice at -8°C?

    asked on February 3, 2016
  26. Chemistry

    A common laboratory reaction is the neutralization of an acid with a base. When 50.0 mL of the .500 M HCl at 25 C is assed to 50 mL of .500 M NaOH at 25 C in a coffee cup calorimeter, the temperature of the mixture rises to 28.2 C. What is the heat of

    asked on November 16, 2012
  27. Physics

    A 12000 kg airplane launched by a catapult from an aircraft carrier is accelerated from 0 to 200 km/h in 3 s. (a) How many times the acceleration due to gravity is the airplane's acceleration? (b) What is the average force the catapult exerts on the

    asked on January 16, 2013
  28. algebra

    Given D=5, E=10 and F=4, evaluate D E/F Multiple choice 1/2 2 25/2

    asked on June 13, 2011
  29. Physics

    Each of the protons in a particle beam has a kinetic energy of 3.05 10-15 J. What are the magnitude and direction of the electric field that will stop these protons in a distance of 1.15 m?

    asked on February 6, 2010
  30. maths

    Mr B is now twice as old as his younger brother. Eight years ago he was three times as old as his younger brother was then. How old is the younger brother now?

    asked on February 3, 2016
  31. Chemistry

    word equation for Potassium Carbonate + Nitric Acid

    asked on April 21, 2010
  32. physical science

    If 500 kg of water at 200 degrees F is poured into a lake that is 50.0 degrees F, how much heat is added to the lake? Joules added = mass x specific heat water x delta T. mass = 500 kg Look up specific heat water in cal/kg delt T is 200. Solve for Joules

    asked on June 22, 2007
  33. Medical Transcription Editing

    'He suffered an injury to his knee and this is causing him pain and discomfort'. What are the verbs in this sentence PLEASE? I think they are 'suffered' and 'causing' but I was marked 'incorrect' .. I'm at a loss!

    asked on May 15, 2016
  34. MATH


    asked on February 5, 2012
  35. Physics

    A molecule of DNA (deoxyribonucleic acid) is 2.03 µm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and compresses 1.13% upon becoming charged. Determine the

    asked on February 6, 2010
  36. Chemistry-pls help

    I refer to the following question. Is my explanation correct, that step two C6H14(g)--> 6CO2(g) + 7H2O(g) can be considered combustion reaction? Thank you! Posted by jan on Tuesday, March 31, 2009 at 10:28pm. C6H14(l)->C6H14(g) ->6CO2(g) + 7H2O(g)

    asked on April 1, 2009
  37. math

    what is the combined height of 6 nickels?

    asked on January 23, 2014
  38. physical science

    How much heat is required to raise the temperature of a 10.0 kg of aluminum by 80 degrees Celsius? Look up the specific heat of aluminum. The units will be Calories/kg*degC or Joules/kg*degC. Multiply that number by the temperature change (80 C) and the

    asked on June 22, 2007
  39. Spanish

    ¿Qué obras de arte o de literatura influyen en tu vida? What would be an answer to this? I believe the question is asking what art or literature has influenced your life.

    asked on April 5, 2016
  40. math

    Sam needs to cut a piece of sheet metal into 8 pieces, it takes 5 minutes to cut, how many cuts will he make.

    asked on March 30, 2016
  41. math

    Home health signed a 90,000 note at 11 1/2% simple interest for 180 days for electronic equipment, on October 1. On February 18, the note was sold to another firm at a discount rate of 12 1/2%. Find a) the discount period, b) the discount, and c) the

    asked on June 7, 2013
  42. Math

    How do you figure out the equation; 3k/5 + 44 = 12k/25 +8

    asked on January 11, 2012
  43. managing human resources

    why do many companies find increasing and managing diversity to be difficult challenges

    asked on October 27, 2011
  44. basic statistics for the behavioral sciences

    on a standard test of motor coordination, a sports psychologist found that the population of a average bowlers had a mean scores of 24,with a standard deviation of 6. she tested a random sample of 30 bowling alley and found a sample mean of 26, a second

    asked on September 12, 2011
  45. Chemistry

    I need help finding the molar mass of anhydrous salt.

    asked on December 10, 2007
  46. chemistry

    Look in the owner’s manual of your car to determine the amount of gasoline your tank can hold. Using the information presented in the text, calculate how much carbon dioxide is produced from driving your car for a year assuming that all the gas is octane

    asked on May 30, 2017
  47. math

    Clay earned $2,600 last he paid $234 for entertainment. What percent of his earnings did clay pay in entertainment expenses?

    asked on January 5, 2017
  48. chemistry

    calculate the number of moles of Mg in 0.12g(relative mass of Mg=24)

    asked on May 5, 2016
  49. geometry

    Dru is challenged by her geometry teacher to estimate the height of the school flag pole without measuring. She decided to walk off the length of the shadow cast by the pole by successively walking the noted length of her shadow. If dry is 5ft 6 in.tall

    asked on January 30, 2014
  50. Chemistry

    Why is "pure orange juice" not a pure substance?

    asked on February 24, 2009
  51. Intro to Physical Science

    A 3-kg stone is dropped from height of 100 m. Find its kinetic and potential energies when it is halfway to the ground.

    asked on January 22, 2013
  52. math

    my son is x year old ,in five years time i will be twice his age and both our ages will be multiples of 10.the sum of ages will be between 50 and 100.how old am i

    asked on March 2, 2016
  53. Statistics

    If the average home cost $100,000, with a standard deviation of $15,000, what would a home on the 20th percentile rank cost?

    asked on April 3, 2015
  54. elem algebra

    the current in a stream moves at a speed of 10 mph. a boat travels 17 mi upstream and 17 mi downstream in a total time of 10 hr. What is the speed of the boat in still water?

    asked on April 19, 2014
  55. calculus

    Find the points of inflection. f(x) = e^(-x^2) I need to know step by step how you would get the points of inflection.

    asked on May 1, 2011
  56. Math-Probability

    What are the odds in favor of rolling a 5 if you roll a 1-6 number cube?

    asked on March 21, 2011
  57. Managerial Economics

    Help me on this one please? labor usage 3,7,9,11,17,17,20,24,26,28,30 output 1,2,3,5,8,10,15,18,22,21,23 a. does a cubic equation appear to be a suitable specification, given these data? You may construct a scatter diagram to help with this question.

    asked on September 12, 2009
  58. english

    I have to write a contrast compare essay on dr kings i had a dream speech and old majors speech from animal farm. i need help

    asked on March 8, 2009
  59. Grammar

    Are these the verbs in this sentence, please help?! 'The patient is alert and oriented and has normal mental status exam.' Verbs: 'is alert' - 'oriented' Thank you.

    asked on May 15, 2016
  60. ART 101

    There are several, but does any one know at least the top 5 vocabulary words art historians use to describe the work of art? I have three but I would like at least 2 more. I would greatly appreciate it. Thanks

    asked on April 29, 2015
  61. logic and design

    algorithm for waking in the morning, making and eating breakfast, I don't feel this is enough for my teacher can you help me. start get up while not awake drink coffee endwhile if temperature < 65 then wear sweater else wear t-shirt endif if hungry then

    asked on January 29, 2015
  62. Calculus

    Find the critical numbers of the function. h(t)=t^3/4-6^1/4

    asked on October 13, 2013
  63. uitm

    Household hydrogen peroxide is an aqueous solution containing 3.0% hydrogen peroxide by mass. What is the molarity of this solution? (Assume a density of 1.01 g/mL.)

    asked on July 27, 2013
  64. agl 2

    rewrite: tan 4 X + tan 2 X/ 1 - (tan4X)(tan2X)

    asked on June 26, 2012
  65. medical billing

    reimbursement methodologies

    asked on May 6, 2011
  66. chem

    A sample of O2 gas was collected over water at 23ºC and 711 torr. What is the partial pressure of the O2? (The vapor pressure of water at 23ºC is 21.2 torr.) Partial pressure of O2:_____torr

    asked on April 18, 2011
  67. Chemistry

    What is the purpose of adding zinc chloride in the preparation of starch iodide paste? Please refer to the procedure below: - Starch Iodide Paste- Heat 100mL of water in a 250mL beaker to boiling, add a solution of 0.75g of potassium iodide in 5mL of

    asked on March 6, 2011
  68. Science

    What are ten land biomes and animals that live in each one?

    asked on November 9, 2010
  69. science

    what is the solute and solvent in a solution made from 15 mL of oxygen and 5 mL of helium?

    asked on November 4, 2010
  70. Physical Science

    The speed of a train increases fron 100km/h to 250km/h in 5 min. What is its acceleration

    asked on October 18, 2010
  71. physics

    Van de Graaff generator is charged to 50,000 volts, how much energy does it take to add an additional electron to the charge on the sphere?

    asked on July 2, 2010
  72. spanish

    answer the questions in spanish: 1.¿Qué enciendes cuando tienes calor? 2.¿Qué apagas cuando tienes frío? 3.¿Qué usas en tu cama cuando hace frío? 4.¿Dónde están las cosas muy frías en tu cocina? 5.¿Dónde está tu ropa? 6.¿Qué hay en las

    asked on January 28, 2010
  73. Managerial Economics

    Textbook authors typically receive a simple percentage of total revenue generated from book sales. The publisher bears all the production costs and chooses the output level. Suppose the retail price of a book is fixed at $50. The author receives $10 per

    asked on September 12, 2009
  74. biology

    Can males have turner syndrome? Like if a male was born with part of his x chromosome missing?

    asked on November 4, 2007
  75. physical science

    why does the temperature of boiling water remain the same as long as the boiling continues? Because it is a pure compound undergoing a phase change. The constant temperature is a requirement of the Gibbs Phase Rule. It is not obvious why this happens. If

    asked on June 22, 2007
  76. math

    show how to simplify before you multiply 3 1/2 x 2 2/7 4445456743+38067738476= change both mixed fractions to "improper" fractions 3 1/2 x 2 2/7 = 7/2 x 16/7 =8 (after you cancel)

    asked on May 22, 2007
  77. metric system

    does 1 liter = 1 kg? If the liquid is H2O, yes. To convert volume to mass, you need to know the density. They are not the same thing. Volume = Mass/Density and the volume you're talking about is in liters? 1 mL = 1cm (for water) so convert it to figure it

    asked on December 17, 2006
  78. As physics

    The table below shows how the braking distance x for a car depends on its initial speed u u / ms-1 5.0 10 20 4 x / m 2.0 8.0 32 128 the reaction time of a driver is 0.60s. Calculate the sopping distance of the car when u= 30ms-1. The mark scheme says:

    asked on December 1, 2017
  79. Calculus

    An error in the measurement of the radius of a circle results in an error in the computation of its area. Find and interpret the sensitivity of area (a) of a circle to the measurement of radius, r, when the radius r=2 meters.

    asked on October 22, 2016
  80. Spanish

    Please check my answer. Are all the accent marks, grammar, and spelling correct? ¿Qué hago para ponerme en forma? Para ponerme en forma hago ejercisios y como bien.

    asked on April 5, 2016
  81. algebra 1

    Graph each function;identify the domain and range;and compare the graph with the graph of y=1/x. 1.y=-10/x Domain: Range: Compare: 2.y=1/(x+3)+3 Domain: Range: Compare:

    asked on May 9, 2013
  82. algebra 1

    Solve rational equation 1. 2/b-2=b/b^2-3b+2 + b/2b-2

    asked on April 23, 2013
  83. algebra 1

    Simplify using long division(please show work so I understand) 1.Divide (72-8x^2+4x^3-36x)by (x-3) 2.Divide (8b^3-6) by (2b-1)

    asked on April 15, 2013
  84. physics

    This question has me stumped because I am not really sure about the capacitor. "Imagine a free electron and a free proton held midway between the plates of a charged parallel plate capacitor. When released, how do their accelerations and directions of

    asked on April 30, 2012
  85. eng/lit

    In line 8 Of against that time the reasons mentioned are best characterized as a)scientific explanations for a natural force b)arguments against rationality itself c)arguments for the importance of loving d)logical explanations for the absence of love

    asked on October 6, 2011
  86. eng/lit

    Which of the following best describes the language of the poem Against that time Shakespeare? a)concrete and matter-of-fact b)euphemistic and prosaic c)metephoric and logical d)informal and conversational e)ironic and amused

    asked on October 6, 2011
  87. eng/lit

    in the sonnet against that time shakespeare in lines 1-12,which of the following is a main verb? a)come line 1 b)shall see line2 c) shalt pass line5 d)shall find line8 e)do ensconce line 9?

    asked on October 6, 2011
  88. solid mensuration

    A cylindrical tin can holding 2 gal.has its height equal to the diameter of its base.Another cylindrical tin can with the same capacity has its height equal to twice the diameter of its base. Find the ratio of the amount of tin required for making the two

    asked on May 12, 2011
  89. Math

    Which expression is equivalent to -5(n-9) ?

    asked on March 21, 2011
  90. math

    20/36 in simplest form

    asked on May 3, 2010
  91. physics

    A uniform electric field of magnitude 333 N/C is directed along the +y-axis. A 6.00 µC charge moves from the origin to the point (x, y) = (-10 cm, -37 cm). A). What is the change in the potential energy associated with this charge? B).Through what

    asked on February 8, 2010
  92. Physics

    A charged particle A exerts a force of 2.39 ìN to the right on charged particle B when the particles are 13.3 mm apart. Particle B moves straight away from A to make the distance between them 16.1 mm. What vector force does particle B then exert on A?

    asked on February 6, 2010
  93. physics

    The vertical leap of a professional NBA athlete is reported to be 47.3 inches. What is his takeoff speed? in m/s? is this kinematics??

    asked on December 10, 2009
  94. Economics

    You have just started work for a small company, FitCo, that develops private fitness clubs in small towns. FitCo buys or leases a local hotel or motel, then renovates to provide a gym, swimming pool, sauna, Jacuzzi, and a small café where patrons can buy

    asked on September 15, 2009
  95. Chemistry pls help

    C6H14(l)->C6H14(g) ->6CO2(g) + 7H2O(g) ->6CO2(g) + 7H2O(l) Hexane is a liquid at room temp. It can be converted into carbon dioxide and water through the above processes. There are 3 steps. Steps 2 & 3 are exothermic, right? I think step 2

    asked on March 31, 2009
  96. math

    i don't understand what a horizontal or vertical stretching is of a graph. y=x^3 Find graph horizontally stretched by a factor of 4 and vertically stretched by a factor of 4

    asked on October 2, 2008
  97. civics, government, presidential elections 2008

    How are Hillary CLintons views on illegal immigration different than the republicans...what makes her solution better?

    asked on February 4, 2008
  98. physical science

    A smoke particle undergoing Brownian motion in air has a mass of 2.00 x 10 -5 kg. a) what is the its average velocity if the temperature is 300 K? b) what is its average kinetic energy? The average kinetic energy of a particle or molecule of any mass is

    asked on June 22, 2007
  99. physics

    I am to measure the deflection by contructing a post and lintel system using the dowels I have (with different diameters, which will be my variables). This is a system to measure the deflection under a load. I want to create a chart to present my results,

    asked on December 2, 2006
  100. Math

    Write the equation of a line in slope intercept form that is parallel to the given line and passes through the given point. y = 2x + 3 (1, 7)

    asked on December 13, 2017


  1. 1
  2. 2
  3. 3