Popular questions and responses by B
  1. math (stats)

    According to Masterfoods, the company that manufactures M&M’s, 12% of peanut M&M’s are brown, 15% are yellow, 12% are red, 23% are blue, 23% are orange and 15% are green. [Round your answers to three decimal places, for example: 0.123] Compute the

    asked on October 2, 2016
  2. physics

    A geologist finds that a Moon rock whose mass is 9.97 kg has an apparent mass of 6.40 kg when submerged in water. What is the density of the rock?

    asked on January 24, 2012
  3. calculus

    A freshly brewed cup of coffee has temperature 95°C in a 20°C room. When its temperature is 71°C, it is cooling at a rate of 1°C per minute. When does this occur?

    asked on June 9, 2019
  4. business

    . You've written a check to Goodwill Supply, and the check has been lost. What should you do? A. Stop payment on the first check; then write a second one. B. Send a counter check to Goodwill. C. Write another check immediately. D. Call Goodwill and tell

    asked on September 22, 2014
  5. Stats

    The time that it takes a randomly selected job applicant to perform a certain task has a distribution that can be approximated by a normal distribution with a mean value of 150 sec and a standard deviation of 20 sec. The fastest 10% are to be given

    asked on October 2, 2013
  6. Chem Oxidation-Reduction Titrations

    H2O2→ O2 + 2H+ + 2e- OCl- + 2H+ + 2e-→ H2O+ Cl- H2O2(aq) + OCl-(aq) → H2O(l) + Cl- (aq) + O2(g)Assign oxidation numbers to the following atoms: O in H2O2 ________; Cl in OCl- __________The oxidizing agent for this RedOx rxn is_____________. The

    asked on February 8, 2018
  7. College Chem.

    Determine the longest wavelength of light required to remove an electron from a sample of potassium metal, if the binding energy for an electron in K is 1.76 × 103 kJ/mol.

    asked on September 1, 2010
  8. math

    ABCD is a rectangle. If AC = 2(5a + 1) and BD = 2(a + 1), find the length of each diagonal.

    asked on May 9, 2014
  9. Math

    Consider the experiment of drawing two cards without replacement from an ordinary deck of 52 playing cards. What are the odds against drawing two kings?

    asked on September 28, 2009
  10. chemistry

    Ammonia, NH3, is used as a refrigerant. At its boiling point of -33ºC, the enthalpy of vaporization of ammonia is 23.3 kJ/mol. How much heat is required to vaporize 125 g of ammonia at -33ºC?

    asked on May 12, 2010
  11. Chemistry

    The specific heat of zinc is 0.096 cal/(g °C). Determine the energy required to raise the temperature of 26.1 g of zinc from room temperature (20.0 °C) to 150 °C.

    asked on April 3, 2013
  12. math

    A recycling center pays 25 cents per aluminum can recycled at its facility. If Tracy recycles 5 aluminum cans there, how many dollars will she earn?

    asked on April 29, 2018
  13. Algebra

    For the equation 9x^2+4y^2+54x-8y+49=0 determine the center, vertices and foci?

    asked on May 4, 2015
  14. Algebra

    Renee is twice as old as Dana. Four years ago Renee was three times as old as Dana. How old are Renee and Dana now? Show Work

    asked on April 27, 2015
  15. chemistry

    If He(g) has an average kinetic energy of 7590 J/mol under certain conditions, what is the root mean square speed of F2(g) molecules under the same conditions?

    asked on September 28, 2014
  16. Chemistry

    How many joules of energy are needed to change 275 g of water from 15°C to steam at 100.°C?

    asked on April 3, 2013
  17. Math Analysis

    (3.) The plane 2x + 3y – 4z = 5 intersects the x-axis at (a,0,0), the y-axis at (0,b,0), and the z-axis at (0,0,c). The value of a + b + c is?

    asked on September 29, 2011
  18. PreCalc

    Simplify the ratio of factorials. (n+2)!/(n-1)!

    asked on November 10, 2010
  19. algebra

    The sum of ten and the quotient of a number xxx and 666

    asked on March 9, 2020
  20. chemistry

    how many joules are needed to completely melt 25 grams of ice at 0 degree celcius?

    asked on December 6, 2015
  21. Chemistry

    A 1.50 L buffer solution is 0.250 mol L-1 in HF and 0.250 mol L-1 in NaF. Calculate the pH of the solution after the addition of 0.0500 moles of solid NaOH. Assume no volume change upon the addition of the base. The Ka for HF is 3.5 × 10-4. Thanks in

    asked on June 21, 2015
  22. office

    Which of the following organizations would most likely use an unabridged dictionary? A. The English department at a large university B. An automotive dealership C. A large retail department store D. A pediatrics hospita

    asked on September 19, 2014
  23. Chemistry

    (a)What is the bond order of the diatomic molecule BN? (b) Is BN paramagnetic? (c) Rank the following compounds in order of increasing bond energy: B2, N2, BN. (d) Rank the following compounds in order of increasing bond length: B2, N2, BN.

    asked on November 18, 2012
  24. physics

    Two students are on a balcony 18.3 m above the street. One student throws a ball (ball 1) vertically downward at 12.2 m/s; at the same instant, the other student throws a ball (ball 2) vertically upward at the same speed. The second ball just misses the

    asked on August 29, 2011
  25. Algebra

    Michael invested his savings in two investment funds. The amount he invested in Fund A was $2,000 less than the amount he invested in Fund B. Fund A returned a 4% profit and Fund B returned a 3% profit. How much did he invest in Fund A, if the total profit

    asked on March 19, 2011
  26. psychology

    Post a 200- to 300-word response to the following: Describe the stages of sleep. In which stage do we dream? What are the five common beliefs about dreaming? What are the two common theories about dreams?

    asked on July 28, 2010
  27. biology

    Comparisons of amino acid sequences from different organisms often shed light on the evolutionary divergence of related species. Would you expect all of the proteins of a given set of living species to show the same degree of divergence?

    asked on April 18, 2010
  28. chemistry

    Whatis the chemical name of the substance formed in the slow reaction that takes place when iron filings are mixed with water?

    asked on September 13, 2008
  29. Chem

    A chemist was asked to find the molecular mass of a gas. She massed the gas and found that 3.73 g of the gas occupied 300 cm3 at 25°C and 92.4 kPa. What is the molecular weight of the gas?

    asked on March 28, 2008
  30. Biology

    Give an example of a negative feedback loop in nature

    asked on December 10, 2019
  31. Math

    600,000. = _ ten thousands

    asked on November 16, 2016
  32. Physics

    Blue light (λ vac= 440 nm) shines onto a puddle of water (n water = 1.33). There is a thin layer of oil (n = 1.47) on top of this water. What is the minimum thickness of the oil if there is constructive interference for the light? I tried 2t=(m+

    asked on April 5, 2016
  33. Math

    Please help: Jaylee wants to have a mural for her room. She has two bids: #1 Artist charges an initial fee of $79.50, plus $1 sq ft. Artist #2 does not charge a initial fee and charges $2.50 sq ft. Which size of mural(in sq ft) will be the same cost when

    asked on February 1, 2016
  34. math-story prob

    Please help: Jaylee wants to have a mural for her room. She has two bids: #1 Artist charges an initial fee of $79.50, plus $1 sq ft. Artist #2 does not charge a initial fee and charges $2.50 sq ft. Which size of mural(in sq ft) will be the same cost when

    asked on February 1, 2016
  35. Science

    Describe the flow of blood in the human body, including through each of the four chambers of the heart. Explain how the blood changes as it moves through various locations in the body.

    asked on February 11, 2015
  36. Algebra

    Use a graphing utility to approximate the real solutions if any, of the given equation rounded to two decimal places. x^3-9x+1=0

    asked on September 17, 2014
  37. Chem.

    At equilibrium, the concentrations in this system were found to be [N2]=[O2]=0.200 M and [NO]=0.500 M. N2 + O2= 2NO If more NO is added, bringing its concentration to 0.800 M, what will the final concentration of NO be after equilibrium is re-established?

    asked on April 1, 2014
  38. Chemistry:Important!!!!!!!

    A student begins with 9.7 mL of a 0.26 M Cu(NO3)2 solution and performs copper cycle lab. She recovers 0.075 grams of copper metal. A) What is the Theoretical Yield B) What is the Actual Yield C) What is the Percent Yield

    asked on February 10, 2014
  39. chemistry

    What volume of carbon monoxide gas (at STP) is needed when 1.31 moles of oxygen gas react completely in the following equation? 2 CO + O2 --> 2 CO2

    asked on November 10, 2013
  40. BioChem

    In yeast, ethanol is produced from glucose under anaerobic conditions. What is the maximum amount of ethanol (in millimoles) that could theoretically be produced under the following conditions? A cell-free yeast extract is placed in a solution that

    asked on October 30, 2013
  41. math

    A box contains four red, three blue, and six green lenses. Two lenses are randomly selected from the box. Find the probability of getting two red lenses when two are selected if the first selection is NOT replaced before the second selection is made.

    asked on March 3, 2013
  42. Chem

    how to prepare a 250 mL solution of .15 M K2SO4 with a volumetric flask

    asked on January 15, 2013
  43. Physics

    A monatomic ideal gas expands from 1.00m^3 to 2.50m^3 st a constant pressure of 2.00x10^5 Pa. Find the change in the internal energy of the gas.

    asked on November 24, 2012
  44. math

    what is 14.76 rounded to the nearest hundredth?

    asked on November 16, 2012
  45. physics

    Calculate the total force of the atmosphere acting on the top of a table that measures 1.9 m by 2.3 m.

    asked on January 23, 2012
  46. physics

    A person holds a 1.42N baseball in his hand, a distance of 34.0cm from the elbow joint, as shown in the figure . The biceps, attached at a distance of 2.75cm from the elbow, exerts an upward force of 12.6N on the forearm. Consider the forearm and hand to

    asked on October 29, 2011
  47. trig

    a propeller turns at 300 rpm. Find the angular speed in rad/sec and the linear speed at the tip if the tip to the center is 30cm

    asked on September 1, 2011
  48. physics

    Two students are on a balcony 18.3 m above the street. One student throws a ball (ball 1) vertically downward at 12.2 m/s; at the same instant, the other student throws a ball (ball 2) vertically upward at the same speed. The second ball just misses the

    asked on August 29, 2011
  49. Chemistry

    What is the heat capacity of 190g of liquid water? I came up with 794.96 but it says my sig figs are wrong? Help?????

    asked on May 19, 2010
  50. chemistry

    Which substance is an electrolyte? C2H5OH C6H12O6 C12H22O11 CH3COOH

    asked on May 18, 2010
  51. Biology

    Explain how the potential energy of carbon and its ability to tetramerize lead to the development of macromolecules

    asked on April 18, 2010
  52. astronomy

    Retrograde motion describes the backward motion of the stars relative to earth

    asked on March 27, 2010
  53. Biology

    Please answere these questions: identify each statement as observation, hypothesis, or prediction and then tell if it is inductive or deductive Male Red-winged Blackbirds display red wing patches to signal superiority to other males A male Red-winged

    asked on November 1, 2009
  54. Math

    A cereal box is 6 1/2 inches long, 3 1/2 inches wide, and 12 inches high. What is the volume of the box?

    asked on March 11, 2020
  55. Biology

    How can carbon be sequestered in a tree for a long time

    asked on December 10, 2019
  56. math

    Translate the sentence into an inequality. Nine times the sum of a number and is at most . Use the variable b for the unknown number.

    asked on September 29, 2019
  57. Math

    I am Having a little trouble on The Vanishing Point Quiz... so here are my answers A triangle has angle measures 23 and 35. What is the measure of the third angle? A. 32 B. 90 C. 122 D. 180 What is the measure of ACD A. 30 B. 63 C. 147 D. 150 Which lists

    asked on September 13, 2019
  58. differential equation

    dy/dx=(6x^2 *y^2)

    asked on May 28, 2019
  59. Chemistry

    What should the molar concentrations of benzoic acid and sodium benzoate be in a solution that is buffered at a pH of 4.84 and has a freezing point of -2.0 ∘C? (Assume complete dissociation of sodium benzoate and a density of 1.01 g/mL for the solution.)

    asked on April 14, 2019
  60. Chemistry

    To 1.0 L of a 0.38 M solution of HClO2 is added 0.18 mol of NaClO. Calculate the [HClO2] at equilibrium.

    asked on March 25, 2019

    a lump of lead with mass 0.50kg is dropped...

    asked on October 23, 2018
  62. Math

    6+4•5+3=80 insert grouping symbols so that the expression has the desired value

    asked on March 12, 2018
  63. Math

    Quadratic equations in problems: "The sides of a right triangle are (x+1)cm, (x+3)cm and (x+5)cm. find the length of each side." i need help asap

    asked on February 21, 2018
  64. Chem Oxidation-Reduction Titrations

    In our lab, the data consists of 1. Volume of NaOCl (mL): Trial 1= 10 ml & Trial 2= 10 mL. How can we find the concentration (Molarity), what would the calculated value be? 2. Volume of H2O2 (mL): Trial 1= 1/ml & Trial 2= 1/mL. How can we find the given

    asked on February 8, 2018
  65. Physics

    A brick that weighs 23 kg is laying on a table. The brick is retained. From the brick, a thread is connected via a castor to a weight with the mass of 19 kg. With how much force do the thread effect the hanging weight if you release the brick. Coefficient

    asked on October 8, 2017
  66. math, graphs

    the number of counselors must be 1/4 of the number of campers. write a rule for the number of counselors that must be at camp. wrote ordered pairs for the number of counselors when there are 76, 100, 120, and 168 campers.

    asked on October 5, 2017
  67. Math

    Calculate The Totale Surface Area And The Volume Of The Given Right Triangular Prism?

    asked on May 14, 2017
  68. Social Studies

    What was one effect of the Haymarket Riot? A) The influence of the American Federation of labor diminished B) The practice of collective-bargaining became more common C) Membership in the knights of labor grew rapidly *** D) Organized labor became less

    asked on March 6, 2017
  69. test and measures

    Suppose I want to use a test to help predict who will quit their jobs before the end of the three-month probation period. 100 new applicants are hired and the test is adminstered to all of them on the first day. Half of them quit before the end of the

    asked on January 27, 2017
  70. History

    Would someone please give some reputable sources for history of smallpox in Europe and China. I am writing a paper on it. My thesis is There are similarities in the devastation, experts and vaccination in the regions of both China and Europe as it relates

    asked on December 3, 2016
  71. physics

    a 1240 kg automobile stops in a distance of 41m. if initial velocity was 22.5m/s, what force did the road exert on the car to stop it? Answer pls... Thank You

    asked on October 9, 2016
  72. physics

    A 350N box is pulled along a horizontal pathway by a rope which makes an angle of 42degrees with the pathway. If a force of 250N is applied on the rope, what is the coefficient of sliding friction?

    asked on October 9, 2016
  73. physics

    Aljhumar is trying to arrange his room. He pushes an 80kg cabinet across the wooden room which resists the motion with a 300N force of friction. What is the coefficient of sliding friction between the cabinet and the floor?

    asked on October 9, 2016
  74. physics

    The coefficient of sliding friction between a 10kg rubber tire and wet concrete road is 0.43. Determine the time in which a moving object with a velocity of 35mi/h can come to a stop on the road. What distance is covered at this time?

    asked on October 9, 2016
  75. physics

    A 2.2kg bowling ball with a velocity of 2m/s rolls along a level floor for 30m before coming to a halt. What is the coefficient of rolling friction?

    asked on October 9, 2016
  76. math (stats)

    Enter your answers as decimals or fractions, rather than percents. In a family with 7 children what is the probability of having 4 boys and then 3 girls, in that order? (Exclude multiple births and assume all outcomes are equally likely). Preview In a

    asked on October 2, 2016
  77. Chemistry

    How many grams of MgCl2 would be required to make 440 g of magnesium ? The other product is chlorine.

    asked on April 26, 2016
  78. European History, Modern History

    "Provide a thorough explanation of Hungary's impact on the communist bloc politically, and compare Hungary's situation to that of other Warsaw Pact members." I've decided to use the Revolution of 1956 and Goulash Communism as my examples, but I'm not sure

    asked on April 13, 2016
  79. Physics- Optics

    A double lens system is made of +35.0 cm lens (lens #1) and a - 26.0 cm lens (lens #2). Lens #1 is placed at x = 0 cm on a meter stick and lens #2 is placed at x = 30.0 cm. Where on the meter stick will the final image be formed when looking at a distant

    asked on April 5, 2016
  80. Physics-Lens

    The focal length of your camera lens is 70mm. It is used for taking pictures of your friend who is 1.5m tall. What is your friends distance from the lens if the image just fills the 24mm vertical dimension of the film? I tried M=hi/ho=.16 .16=di-f/f

    asked on April 5, 2016
  81. math

    a to the 3rd power divided by a to the 5th power?

    asked on February 15, 2016
  82. math-story prob

    Quinn is selling raffle tickets. The Ultra tickets cost $3 and the deluxe tickets cost $2. Quinn sold 89 tickets for $235. How many of each ticket did Quinn sell?

    asked on February 15, 2016
  83. math

    Need help to simply: 3x+2y=-18 -2x+5y=-26 Please help. Thanks

    asked on February 8, 2016
  84. math

    need to simply: 3x+2y=-18 -2x+5y=-26 Please help

    asked on February 8, 2016
  85. math-story prob

    The total cost of gift baskets include the cost of each basket and a one time delivery fee. The cost of the basket is the same regardless of how many the customers orders. One company bought 40 baskets for a total of $715 and another company bought 400

    asked on January 25, 2016
  86. math-story prob

    Please help: The total cost of gift baskets include the cost of each basket and a one time delivery fee. One company bought 40 baskets for a total of $715 and another company bought 400 baskets for $5,935. What is the cost per basket? What is the cost for

    asked on January 25, 2016
  87. math-linear equations

    Its a story problem: The flying W Ranch raises only cows and horses. There are total 340 animals. The owner prefers horses to cows, so he has 52 more horses than cows. a. Write two different linear equations to model this situation. b. Solve the system of

    asked on January 19, 2016
  88. Math

    Please help me: I need an equation in slope intercept form when I know these values(-6,1) (-3,2). Do I have to do another equation first?

    asked on January 10, 2016
  89. math

    need an equation in slope intercept form when I know (-6,1) (-3,2)

    asked on January 10, 2016
  90. algebra

    School play tickets are $5.00 for none students and $3.00 for students. 937 ticket were sold for $3943.00 How many student tickets were sold and how many none student tickets were sold ?

    asked on December 13, 2015
  91. English

    How does the interaction between waverly develop over the course of the passage "rules of the game."

    asked on October 28, 2015
  92. chem

    If you maximize the unshared electrons in the boron atom, the electron configuration is? i know the electron configuration at ground state is 1S2 2S2 2P1 but when it maximizes unshared electrons i don't understand how it affects the configuration

    asked on August 24, 2015
  93. physics

    You have an RC circuit and you measure the "zero" voltage to actually be 2.385 [Volts]. The peak voltage is measured to be 8.262 [Volts]. At what voltage value will you look for t4 = time stamp for 15/16 total charge?

    asked on March 18, 2015
  94. Physics

    1. Given t1/2 to be 0.0137 seconds, how long should it take to reach 87.5% of maximum charge?

    asked on March 10, 2015
  95. Physics help please!

    1. Given t1/2 to be 0.0137 seconds, how long should it take to reach 87.5% of maximum charge? 2. Let's say you measure t1/2 to be 0.0137 seconds and the resistance in the circuit is 99 Ohms. Then what is the capacitance in micro Farads? 3.q = qmax(1 - e -t

    asked on March 10, 2015
  96. problem

    Value Rent-A-Car rental a luxury car at a daily rate of $42.15 plus 50 cents per mile. A business person is allotted $130 for car rental each day. How many miles can the business person travel on the $130?

    asked on February 8, 2015
  97. English IV

    Help Please! Choose the function of the italicized infinitive phrase shown below. (stars indicate italicized infinitive phrase) Meridith is *to be restored as captain.* Answer Options: Function of infinitive: Adjective, Adverb, or Noun. (I chose adverb &

    asked on February 20, 2014
  98. chemistry

    Q2: A sample of carbon dioxide(CO2) has a mass of 55g and occupies 3.3L at 100C. What pressure does the gas exert (in kPa)?

    asked on December 8, 2013
  99. chemistry

    Q3: In the combustion reaction of 149g of propane(C3H8) with excess oxygen, what volume of carbon dioxide(CO2) is produced at STP? (note: balance the reaction first) C3H8 + O2  3CO2 + H2O

    asked on December 8, 2013
  100. chemistry

    Aluminum granules are a component of some drain cleaners because they react with sodium hydroxide to release both energy and gas bubbles to help clear the drain clog. The reaction is: 2NaOH + Al + 6H2O  2NaAl(OH)4 + 3H2 (note: balance the reaction

    asked on December 8, 2013


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