Most popular questions and responses by Jenn
  1. Geometry Question

    B is the midpoint of segment AC and D is the midpoint of segment CE. Solve for x, given BD=3x+5 and AE=4x+20. Sorry I couldn't get the link for the picture but, the diagram is a picture of a triangle with a C at the top, and A and E on the bottom angles,

    asked on January 2, 2012
  2. physics

    A charge of +q is located at the origin, while an identical charge is located on the x axis at x = 0.45 m. A third charge of +4q is located on the x axis at such a place that the net electrostatic force on the charge at the origin doubles, its direction

    asked on January 31, 2010
  3. Chemistry

    Compounds like CCL2F2 are known as chloroflourocarbons, or CFCs. These compounds were once widely used as refrigerants but are now being replaced by compounds that are believed to be less harmful to the environment. The heat of vaporization of CCl2F2 is

    asked on December 14, 2006
  4. Geometry Triangle Question!

    In triangle ACE, G is the centroid and BE=9. Find BG and GE. (segments BE and AD cross in the middle of the triangle, BE overlaps AD and C is at the top of the triangle, and A is on the left corner and E is on the right) Thank You So Much!!! ^0^

    asked on January 3, 2012
  5. Algebra

    A financier plans to invest up to $500,000 in two projects. Project A yields a return of 11% on the investment of x dollars, whereas Project B yields a return of 16% on the investment of y dollars. Because the investment in Project B is riskier than the

    asked on June 6, 2018
  6. physics

    Two blocks, each of mass m, are attached to the ends of a massless rod which pivots as shown in Figure 8-40. Initially the rod is held in the horizontal position and then released. Calculate the magnitude and direction of the net torque on this system.

    asked on November 10, 2009
  7. AP CHEM

    I would really appreciate some help on this problem. =) At 218 C, Kc = .00012 for the equilibrium NH4HS(s) NH3(g)+ H2S(g) Calculate the equilibrium concentrations of NH3 and H2S if a sample solid NH4HS is placed in a closed vessel and decomposes until

    asked on March 15, 2007
  8. to bobpursley

    An emergency breathing apparatus often placed in mines works via the following chemical reaction: 4KO2(s) + 2CO2(g) to make 2K2CO3(s) + O2(g) If the oxygen supply becomes limited or if the air becomes poisoned, a worker can use the apparatus to breath

    asked on March 1, 2007
  9. chem

    which of the following is a chemical reaction? A) propane forms a flame and emits heat as it burns. B) Acetone feels cold as it evaporates from the skin. C) Bubbling is observed when potassium carbonate and hydrochloric acid solutions are mixed. D) Heat is

    asked on February 20, 2007
  10. 2 math questions, urgent plz help!!

    The line with equation a + 2b = 0 coincides with the terminal side of an angle θ in standard position and cos θ

    asked on April 23, 2017

    What is common to all light sources, including incandescent, fluorescent, neon, halogen, laser, and sodium-vapor devices? Thank You I really appreciate your help! :3

    asked on March 29, 2012
  12. organic chemistry

    A sample of 2-butanol has a specific rotation of -9.75 degrees. Determine the % ee (enantiomeric excess) and the molecular composition of this sample. The specific rotation of pure (+)-2-butanol is +13.0 degrees.

    asked on November 15, 2008
  13. College Algebra

    Jen recently rode her bicycle to visit her friend who lives 12 miles away. On her way there, her average speed was 10 miles per hour faster than on her way home. If Jen spent a total of 1 hour bicycling, find the two rates.

    asked on September 30, 2014
  14. chemistry

    Now use the average value of Kb the base dissociation constant of acetate anion to calculate an average value for Ka, the acid dissociation constant of acetic acid. Kb: 1.33x10^-10

    asked on May 19, 2017
  15. Physics

    A bell with a fundamental frequency of 880 Hz is moving toward an observer at 3.5 m/s. If the speed of sound is 343 m/s, what pitch would be heard by the observer

    asked on January 2, 2013
  16. Physics

    At 30.0 m below the surface of the sea (density = 1025 kg/m3), where the temperature is 5.00°C, a diver exhales an air bubble having a volume of 0.80 cm3. If the surface temperature of the sea is 20.0°C, what is the volume of the bubble just before it

    asked on January 19, 2010
  17. social studies

    How did communist and nationalist forces influence China? Select all that apply. A. They encouraged the opening of China to foreign trade. B. They caused political conflict and civil war. C. They worked together to overthrow China's last imperial dynasty.

    asked on April 7, 2019
  18. Physics

    A basketball is thrown horizontally with an initial speed of 4.70m/s . A straight line drawn from the release point to the landing point makes an angle of 30.0 ∘ with the horizontal. What was the release height?

    asked on October 5, 2014
  19. Chemistry

    What volume of 1.25M HCl in liters is needed to react completely (with nothing left over) with 0.750L of 0.300M Na2CO3?

    asked on May 5, 2014
  20. organic chemistry

    Determine the percent composition of your unknown mixture. My data for refractive indexes for acetone is 1.365 and water is 1.330. This is what my unknown mixture was composed of. How do I use this info to find percent composition of each compound?

    asked on November 8, 2008
  21. physics

    what impulse is needed to stop a 45 g mass traveling at 42 m/s?

    asked on November 21, 2010
  22. science

    When a fan is turned on it changes electrical energy into blank energy is it ma. Motion b.magnetic c. Gravitational. D. Electromagnetic

    asked on January 27, 2015
  23. Science (Chemistry)

    Assuming gasoline is 100% isooctane, with a density of 0.692g/mL, what mass of carbon dioxide is produced by the combustion of 1.2x10^10 gal of gasoline (the approximate annual consumption of gasoline in the U.S.)?

    asked on February 27, 2011
  24. Math

    Laura was making a recipe that said the ingredients were for 6 people, but she needed to make it for 8 people. The recipe called for 2 2/3 cups of milk and 1/4 cup of oil. How many cups of these liquid ingredients did she need for 8 people?

    asked on October 19, 2017
  25. Trig

    Find the co terminal angle for 15pi/4

    asked on April 7, 2012
  26. math

    the width of a basketball court is 1 m more than half the length. If the area of the court is 364 m squared, find the length and width. Sounds easy...but I do not know how to start off the problem.

    asked on April 8, 2011
  27. math

    the cost per hour of running an assembly line in a manufacturing plant is a function of the number of items produced per hour. The cost function is C(x) = 0.28x^2 - 0.7x + 1 where C(x) is the cost per hour in thousands of dollars and x is the number of

    asked on February 23, 2009
  28. Chemistry

    What is the freezing point of a solution that contains 21.1g of urea, CO(NH2)2, in 305mL water, H2O? Assume a density of water of 1.00 g/mL.

    asked on December 6, 2014
  29. Gases - van der waals

    It turns out that the van der Waals constant b equals four times the total volume actually occupied by the molecules of a mole of gas. Using this figure, calculate the fraction of volume in a container actually ocupied by Ar atoms (a) at STP, (b) at 100

    asked on December 7, 2006
  30. Physics

    A small spherical insulator of mass 6.53 × 10-2 kg and charge +0.600 uC is hung by a thin wire of negligible mass. A charge of -0.900 uC is held 0.150 m away from the sphere and directly to the right of it, so the wire makes an angle with the vertical

    asked on February 26, 2018
  31. Microbiology

    Discuss some of the physical and chemical factors involved in the composition, and in the preparation, of a culture medium. Nutrient ingredients: ___________________________________________________________ ___________ pH and buffering:

    asked on January 18, 2013
  32. Physics

    1580 kg car is traveling with speed of 15 m/s. What is magnitude of horizontal net force that's required to bring the car to a stop in 50 m?

    asked on October 5, 2009
  33. chem question i need help

    I need help on this question. Could someone give me tips on how to solve it? thanks An emergency breathing apparatus often placed in mines works via the following chemical reaction: 4KO2(s) + 2CO2(g) to make 2K2CO3(s) + O2(g) If the oxygen supply becomes

    asked on February 27, 2007
  34. english

    What format does “forest fire” by Anais Nin use? example: compare-and-contrast

    asked on September 18, 2018
  35. calculus

    If a bone is found to have 20% of its normal amount of carbon 14, how old is the bone?

    asked on December 9, 2012
  36. Physics

    292 kg motorcycle is accelerating up a ramp that is 30 degrees above the horizontal. Propulsion force pushing the motorcycle up ramp is 3150 N. Air resistance produces a force of 250 N that opposes the motion. Find that motorcycle's acceleration.

    asked on October 5, 2009
  37. calculus

    If a bone is found to have 20% of its normal amount of carbon 14, how old is the bone?

    asked on December 9, 2012
  38. Statistics

    Williams, Dunsiger, Jennings, and Marcus (2012) conducted a study to test how enhanced mood during exercise can increase the likelihood of physical activity in the future. They reported that at 6 months of physical activity, mood scores (rated on a scale

    asked on September 29, 2017
  39. algebra

    A rock is thrown upward with a velocity of 15 meters per second from the top of a 30 meter high cliff, and it misses the cliff on the way back down. When will the rock be 10 meters from the water, below? Round your answer to two decimal places. I am not

    asked on August 24, 2014
  40. Statistics

    women's heights are normally distributed with a mean 63.1 in and standard deviation of 2.5. A social organization for tall people has a requirement that women must be at least 69in tall. What percentage of woman meet that requirement? The percentage of

    asked on June 1, 2013
  41. Accounting

    Describe the mechanisms that WorldCom’s management used to transfer profit from other time periods to inflate the current period.

    asked on October 5, 2013
  42. Chemisty

    N2+3H2=2NH3 Assume 0.150 mol of N2 and 0.477 mol of H2 are present initially. After complete reaction, how many moles of ammonia are produced?

    asked on April 20, 2012
  43. english

    how does carbon dioxide affect the ocean?

    asked on November 11, 2008
  44. Bus 311

    1. Petra contracted to paint Bret’s house for $2,000. After beginning the job, Petra realizes that the house is really quite big, and she’s not going to make enough profit, so she tells Bret she wants another $500 to finish the job. Bret doesn’t want

    asked on January 9, 2014
  45. Chemistry

    If a sample of silver carbonate contains 1.75 grams of silver [Ag] atoms, calculate the mass (in grams) it contains of oxygen atoms [O].

    asked on September 24, 2014
  46. physics

    A force in the +y direction applied at the point x=2.3m,y=1.4m gives rise to a torque of 39n*m about the origin. Find the magnitude of the force.

    asked on November 16, 2012
  47. Chemistry!!!~!!

    A solution of sodium chloride in water has a vapor pressure of 18.5 torr at 25°C. What is the mole fraction of NaCl in this solution? What would be the vapor pressure of this solution at 48°C? The vapor pressure of pure water is 23.8 torr at 25°C and

    asked on April 19, 2010
  48. Statistic

    test consists of 10 multiple choice questions with five choices for each question. As an experiment, you GUESS on each and every answer without even reading the questions. What is the probability of getting exactly 7 questions correct on this test?

    asked on November 28, 2015
  49. geometry

    On a number line, point A has coordinate 5, and point D is on the line such that AD = 8. What are two possible coordinates of point D?

    asked on January 17, 2012
  50. Physics

    Rollercoaster has a dip that bottoms out in a vertical circle of radius r. Passenger feels seat of car pushing upward on her with a force twice her weight as she goes through the dip. If r = 20.0 m, how fast is rollercoaster going at bottom of the dip?

    asked on October 21, 2009
  51. Science

    trying to lift an 8-N load that is attached to a fixed 2 pulley system. Hands move a distance of 1.6m while the load moves 0.8m, what is the force required to lift the load? I am thinking the the answer is 1.6 divided by 0.8 am i on the right track? what

    asked on February 6, 2013
  52. Physics

    A ball is thrown upward from the top of a 24.6 m tall building. The ball's initial speed is 12 m/s. At the same instant, a person is running on the ground at a distance of 31.2 m from the building. What must be the average speed of the person if he is to

    asked on September 23, 2012

    What is the factoring by grouping? When factoring a trinomial, why is it necessary to write the trinomials in four terms? I will be happy to critique your thinking on this. I do not understand to even answer it? How do we determine the common factors in an

    asked on June 14, 2005
  54. math

    When simplifying a rational fraction, why do you need to factor the numerator and the denominator? Include two examples! to get like terms Can you explain a little more? When you factor then you can cancel like terms Example: 12/3 (3)(4) ------- = 4/1 =4 3

    asked on June 14, 2005
  55. stats

    Using the 68-95-99.7 rule: Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities: Suggest you make a drawing and label first… a. Percentage of

    asked on September 20, 2010
  56. Chemistry

    A 495-mL sample of unknown HCl solution reacts completely with Na2CO3 to form 18.1g CO2. What was the concentration of the HCl solution?

    asked on May 5, 2014
  57. chemistry

    What is the specific heat of a metal if 24.8 g absorbs 65.7 cal of energy and the temperature rises from 20.2 degrees celsius to 24.5 degrees celsius?

    asked on September 4, 2012
  58. french

    what is rinétede, ropterég and miénocoser? plz anser! thx :)

    asked on December 11, 2010
  59. math

    if there are 19 boys and 24 girls in the math class. 10 boys and 15 girls are freshman. if you randomly choose a student, what is the probability that it will be a girl or freshman?

    asked on November 1, 2016
  60. statistics

    The sample mean for a recent introductory psychology test was 78, and the sample variance was 9. If a student received a score of 82, what was this student’s z-score?

    asked on April 19, 2013
  61. algebra

    Dal and kim can assemble a swing set in 1.5 hours. working alone it takes kim 4 hour longer than dal how long will it take dal alone to assemble the swing set

    asked on May 14, 2012
  62. Math

    Angle x is in the second quadrant and angle y is in the first quadrant such that sinx=5/13 and cosy=3/5, determine and exact value for cos (x+y). I have no idea how to even start this question. Could someone please help me?

    asked on November 8, 2009
  63. Organic Chemistry

    Explain why the addition of bromine to trans-cinnamic acid takes place more slowly than the addition of Br2 to a normal alkene like 3-hexene or cyclohexene.

    asked on January 24, 2009
  64. Physics

    Four penguins are being pulled along very slippery (frictionless) ice by a curator. The masses of the three penguins are given below and so are two of the tensions. Find the penguin mass that is not given. 12kg---Unknown--111N--15kg---20kg--222N After

    asked on October 18, 2007
  65. Physics

    A person weighing 900 Newtons is standing on snowshoes. Each snowshoe has an area of 2500cm^2. What is the pressure on the snow?

    asked on January 6, 2015
  66. physics

    A 5.8 g bullet leaves the muzzle of a rifle with a speed of 306 m/s. What total constant force is exerted on the bullet while it is traveling down the 0.75 m long barrel of the rifle?

    asked on March 30, 2011
  67. organic chemistry

    An optical rotation study gives a result of +140 degrees. Suggest a dilution experiment to test whether the result is indeed +140 degrees, not -220 degrees.

    asked on November 15, 2008
  68. english

    what does this quote mean: never underestimate the power of stupid people in large groups please help!

    asked on January 20, 2015
  69. algebra

    a squirrel can run at a speed of 20 miles per hour. How many feet per second is this?

    asked on October 2, 2014
  70. Trig

    19pi/7 Which quadrant does the terminal side lie on?

    asked on April 7, 2012
  71. english

    My fiancé does not think he needs a credit card right now. We are already in enough debt. It has actually consumed our lives. Although most of the debt we have is his. I have my debts too, but they are much smaller. This is why he does not need a credit

    asked on October 21, 2010
  72. Social Studies

    "Spreading light...without taking part in the affairs of the world...seeing as a trap...all expantion into Africa or the Orient-for a great nation to live this way, believe me, less time than you may think, to sink from the first rank to the third

    asked on February 24, 2010
  73. alegebra

    Can some one help me get this into y intercept form x+3y=6. And then explain how to graph it

    asked on January 17, 2010
  74. math

    When simplifying a rational fraction, why do you need to factor the numerator and the denominator? Include two examples! I will be happy to critique your thinking on this. I wouldn't ask if I knew how to guess

    asked on June 14, 2005
  75. statistics probability

    Assume that the thermometer readings are normally distributed with a mean of 0 degrees C and a standard deviation of 1.00 degrees C. A thermometer is randomly selected and tested. The probability of getting a reading between -1.39 degrees C and 1.69

    asked on December 11, 2014
  76. Chemistry

    A block of metal has a width of 3.2 cm, a length of 17.1 cm, and height of 5.8cm . Its mass is 1.5kg . Calculate the density of the metal.

    asked on September 2, 2013
  77. Math

    Nata spent $28 on 2 DVDs. At this rate, how much would 5 DVDs cost?

    asked on February 11, 2013
  78. Chemisty

    What is the molarity of the hydrochloric acid solution used if 25mL of it reacted with excess calcium carbonate to produce 5.3g of calcium chloride? CaCo3(s) + 2HCl(aq)---> CaCl2(aq) + CO2(g) + H2O(l) I am really confused on even what this question is

    asked on November 20, 2011
  79. physics

    a 0.85 kg block of aluminum is heated at atmospheric pressure so that its temperature increases from 22degC to 40degC. find the work done on the aluminum? find the energy added to it by heat? find the change in its internal energy?

    asked on February 2, 2010
  80. math

    Solve the following inequality. Write the answer in interval notation abs value of x+4

    asked on October 2, 2009
  81. chemistry

    "Newton's law tells us that Force= Mass x Acceleration. We also know that Energy = Force x Distance and Pressure= Force/Area. Using these relationships and table I-1 [I'll type it out], derive (do math stuff) the dimensions of newtons, joules, and pascals

    asked on September 13, 2006
  82. math

    When factoring a trinomial, why is it necessary to write the trinomials in four terms

    asked on June 16, 2005
  83. Math using quadratic equation

    The freight train runs 12miles per hour than a passenger train. It runs 65miles in the same time that the passenger train runs 165miles find the rate of each train. I don't really know the formula using quadratic im sorry

    asked on September 15, 2014
  84. Math

    The numerator of a simple fraction is 2 less than its denominator. The sum of this fraction and its reciprocal is 2 4/35. Find this fraction.

    asked on May 8, 2014

    (a) With n=12 and p =0.4 find the binomial probability that p(9) by using a binomial probability table. (b) np ¡Ý5, nq¡Ü5, also estimate the indicated probability by using the normal distribution as an approximation to the binomial, is np < 5 or nq < 5

    asked on June 2, 2013
  86. Math

    If you are dealt a 5-card hand from a standard deck of 52 playing cards, what is the probability (rounded to 6 decimal places) that you are dealt at least 4 hearts?

    asked on May 5, 2013
  87. math

    The ratio of yellow paint to blue paint is 3 quarts to make the color green to paint my bathroom. I need a total of quarts of yellow paint. How many quarts of blue paints I need?

    asked on April 6, 2013
  88. Math

    A survey reported that out of 50 teenagers, 9 said they get their news from a newspaper. At this rate, how many out of 300 teenagers would you expect to get their news from a newspaper?

    asked on February 11, 2013
  89. physics

    A 50 kg uniform ladder, 5.0 m long, is placed against a smooth wall at a height of h = 3.7 m. The base of the ladder rests on a rough horizontal surface whose coefficient of static friction is 0.40. An 80 kg block is suspended from the top rung of the

    asked on November 16, 2012
  90. writing

    Are the following properly referenced in APA format? And if not please fix them accordingly. American Psychiatric Association(2000) Diagnostic and Statistical Manual of MentalDisorders DSM-IV-TR. Barkley R.A. (2006) Attention-Deficit Hyperactivity

    asked on July 21, 2012
  91. Chemistry

    Identify and discuss the differences between the terms ‘theories,’ ‘laws,’ and ‘hypotheses.’ Describe ‘controlled conditions.

    asked on January 7, 2012
  92. cognitive and langauge del.

    Dr bean believes that lanaguage development ia a product of inner predispositions and environmental influences Dr Beans belief is consistant with WHAT? perspective behaviorist nativist interactionist psychoanalyticl

    asked on August 11, 2011
  93. Math

    input 50 1 10 25 5 2 output 1 50 5 2 10 25 What is the rule?

    asked on May 13, 2011
  94. physics

    two equal mass cars collide head to tail and their bumpers lock. One car has a velocity of 10m/s and the other is at rest. what is the velocity of the two cars after the collision?

    asked on March 19, 2011
  95. Chemistry

    Will Zinc react with Zn(NO3)2, Cu(NO3)2,Pb(NO3)2, Mg(NO3)2, AgNO3, Al(NO3)3, or Fe(NO3)3

    asked on January 27, 2011
  96. math

    how to complete a "whats my rule" table

    asked on October 29, 2010
  97. algebra - quadratics

    If Terry hiked 0.5km/h faster, he would have taken 1h less to complete a 15- km hike. What was Terry's hiking speed?

    asked on December 12, 2009
  98. Calculus

    Locate the absolute extrema of the function on the closed interval f(x) = 2(3-x) [-1,2]

    asked on November 16, 2009
  99. Biochemistry

    A peptide has the sequence: Glutamate - His - Trp - Ser - Gly - Leu - Arg - Pro - Gly What is the net charge of the molecule at pH 3, 8, and 11?

    asked on January 21, 2009
  100. psychology

    Can someone help me with these questions, I am having trouble with them. 3. Traumatic events do not always result in a diagnosable psychological disorder. What factors determine how a person may be affected by one such event? 4. What are the four stages in

    asked on November 15, 2008


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