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. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. Chem

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

    asked on January 15, 2013
  10. 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
  11. 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
  12. Algebra

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

    asked on May 4, 2015
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  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. 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
  24. 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
  25. 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
  26. 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
  27. 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
  28. CHEM

    Which of the following mixtures will result in the formation of a buffer solution when dissolved in 1.00 L of water? i) 0.50 mol NaOH and 0.50 mol HCl. ii) 0.50 mol NaCl and 0.25 mol HCl. iii) 0.50 mol NaF and 0.25 mol HF. iv) 0.50 mol NaOH and 0.25 mol

    asked on July 23, 2010
  29. 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
  30. 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
  31. 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
  32. 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
  33. Biology

    Give an example of a negative feedback loop in nature

    asked on December 10, 2019
  34. 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
  35. Math

    600,000. = _ ten thousands

    asked on November 16, 2016
  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

    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
  40. 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
  41. 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
  42. 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
  43. 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
  44. 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
  45. Chemistry

    Consider 125 mL of 0.110 M MgCl2 solution. a. How many moles of MgCl2 are contained in 125 mL of 0.0110 M MgCl2? b. What is the concentration of Mg2+ ion? c. What is the concentration of Cl- ion?

    asked on April 4, 2011
  46. 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
  47. chemistry

    Which substance is an electrolyte? C2H5OH C6H12O6 C12H22O11 CH3COOH

    asked on May 18, 2010
  48. 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
  49. 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
  50. Biology

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

    asked on December 10, 2019
  51. 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
  52. differential equation

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

    asked on May 28, 2019
  53. 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
  54. 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
  56. Math

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

    asked on March 12, 2018
  57. 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
  58. 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
  59. 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
  60. 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
  61. Math

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

    asked on May 14, 2017
  62. 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
  63. 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
  64. 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
  65. 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
  66. 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
  67. 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
  68. 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
  69. 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
  70. 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
  71. 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
  72. 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
  73. 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
  74. 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
  75. 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
  76. math

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

    asked on February 15, 2016
  77. 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
  78. math

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

    asked on February 8, 2016
  79. math

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

    asked on February 8, 2016
  80. 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
  81. 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
  82. 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
  83. 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
  84. 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
  85. 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
  86. math

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

    asked on January 10, 2016
  87. 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
  88. English

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

    asked on October 28, 2015
  89. 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
  90. 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
  91. 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
  92. 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
  93. 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
  94. 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
  95. 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
  96. Chemistry

    Determine how many milliliters of 0.370 M HClO4 will be required to neutralize 58.99 g Ca(OH)2 according to the reaction: 2HC1O4+Ca(OH)2>CaC1O4)2+2H2O How would I set this up?

    asked on April 19, 2013
  97. Chemistry

    Calculate the [H+] for: black coffee with a pH of 6.9 (Enter your answer as follows: 1.0E-2 for 0.010)

    asked on April 19, 2013
  98. social studies

    How can you remember facts about the revolutionary war

    asked on April 16, 2013
  99. Chemistry

    How many kilojoules of energy are needed to convert 104 g of ice at -14.6 to water at 25.8°C? (The specific heat of ice at -14.6 is 2.01 J/g°C.)

    asked on April 4, 2013
  100. bioelectricity

    Assume that frog muscle cell membrane is permeable to Na and K only. The membrane permeabilities for Na and K are Pna and Pk respectively. At 16∘C, the resting membrane is -91 mV. What is the ratio of permeabilities Pna/Pk? For frog muscle, intracellular

    asked on February 19, 2013


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