Popular questions and responses by Bill
  1. algebra

    Are the following true or false? 1. The difference of two natural numbers is always a natural number. 2. The sum of two natural numbers is always a natural number. 3. The quotient of two natural numbers is always a natural number. 4. The difference of two

    asked on September 7, 2010
  2. calc

    Show that the equation x^3-15x+c=0 has at most one root in the interval [-2,2].

    asked on February 28, 2011
  3. math

    Find the exact area of the region that lies beneath the curve y = 3(x^[1/3]) 0 ≤ x ≤ 27

    asked on April 27, 2019
  4. Chemistry

    What quantum numbers specify these subshells? 2s n= l= 3p n= t= 6d n= l=

    asked on October 28, 2012
  5. Honors Chemistry

    Due to the screening effect, the 3s electrons of magnesium (Mg) feel an effective nuclear charge (Zeff) of: 1. +1 2. +2 3. −2 4. +12 5. +4

    asked on September 15, 2010
  6. Chemestry

    Iron metal reacts with oxygen gas to form rust, iron (III) oxide. Which of the following correctly shows the balanced equation for this reaction?

    asked on December 2, 2015
  7. Calculus (Partial Derivatives)

    A car dealer determines that if gasoline-electric hybrid automobiles are sold for x dollars apiece and the price of gasoline is y cents per gallon, then approximately H hybrid cars will be sold each year, where H(x,y)=6000−13x^(1/2)+2(0.1y+20)^(3/2). She

    asked on March 4, 2015
  8. chemistry

    What mass of F2 is needed to produce 116 g of PF3 if the reaction has a 77.4% yield?

    asked on March 10, 2013
  9. Chemistry

    Metals lose electrons under certain conditions to attain a noble-gas electron configuration. How many electrons must be lost by the element Ca? Is it 2 e^-? Which noble-gas electron configuration is attained in this process? argon radon krypton xenon

    asked on October 28, 2012
  10. Chemistry

    At a certain temperature and pressure, one liter of CO2 gas weighs 1.45 g. What is the mass of one liter of C4H10 gas at the same temperature and pressure?

    asked on October 16, 2012
  11. Algebra

    If f(x) = - 2x2 + 2x - 3, what is f(5)?

    asked on May 19, 2010
  12. geometry

    (4, 5)'(9, 5) and (5,1) are three of a quadrilateral whose opposite sides are equal and parallel.there are three possibilities for the co-ordinates of the missing vertex.Find all three,and draw the three quadrilateral on a grid

    asked on May 19, 2011
  13. physics

    Calculate the torque about the front support of a diving board, exerted by a 70 kg person 3.0 m from that support. (Take the positive direction to be clockwise.)

    asked on January 17, 2011
  14. bio

    In humans, the ABO blood type is under the control of autosomal multiple alleles. Red-green color blindness is a recessive X-linked trait. If two parents who are both type A and have normal vision produce a son who is color-blind and type O, what is the

    asked on November 13, 2008
  15. chemistry

    can O3, AsH3 and H2Se act as a lewis acid? please explain.

    asked on July 4, 2011
  16. Biology

    What are the roles of hydrogen peroxide, oxygen, hydrogen, and catalase in the following chemical reaction? catalase 2H2O2 > O2 + 2H2O A. Catalase is an enzyme, O2 and H2O are substrates, and H2O2 is a reactant. B. Catalase is a substrate, O2 and H2O are

    asked on September 12, 2017
  17. Calculus (Partial Derivatives)

    Using x hours of skilled labor and y hours of unskilled labor, a manufacturer can produce Q(x,y)=40xy1/5 units each week. Currently 20 hours of skilled labor and 243 hours of unskilled labor are being used. Suppose the manufacturer reduces the skilled

    asked on February 28, 2015
  18. math

    In the bac of an old cupboard you discover a note signed by a pirate famous for his bizarre sense of humor and love of logical puzzles. In the note he wrote that he had hidden treasure somewhere on the property. He listed five true statements and

    asked on November 4, 2011
  19. PreCalculus

    "A kite is flying 100ft off the ground, and its line is pulled taut. The angle of elevation of the kite is 43 degrees. Find the length of the line."

    asked on March 23, 2011
  20. chemessty

    What is the freezing point of an aqueous solution of 10.0 g of glucose (C6H12O6) in 50.0g H2O? (kf=-1.86 C/m)

    asked on March 16, 2011
  21. spelling paragraph

    I need to write a paragraph using the following words, acculturation,affable, aggrandize, approbation, callow, erudite, expedite, hackneyed, innuendo, inscrutable, intercede, peculate, querulous, remonstrate, repudiate, resilient, sedulous, tenuous Could

    asked on December 7, 2008
  22. Please need help Asap

    Jenna invests in a savings account that has an annual interest rate of 12% compounded monthly. Jenna initially deposits $2673. How much money will Jenna have after 4 years?

    asked on March 12, 2018
  23. chemistry

    What has the higher normal melting point: CHI3 or CHF3? The answer in the book is CHI3. So I'm assuming the answer is CHI3 because Iodine is the bigger and will form larger london dispersion forces, but isn't a stronger dipole moment formed in CHF3 because

    asked on January 16, 2013
  24. Economics/Finance

    How much Jim can accumulate in a private pension fund over 20 years if the fund offers 5% interest compounded annually, and he can afford to deposit $2,000 at the end of every 2nd year? My textbook says the correct answer is $32,259, but I can't seem to

    asked on July 4, 2016
  25. Chemistry

    A 5.00-g sample of aluminum pellets (specific heat capacity = 0.89 J/°C · g) and a 10.00-g sample of iron pellets (specific heat capacity = 0.45 J/°C · g) are heated to 100.0°C. The mixture of hot iron and aluminum is then dropped into 91.9 g of water

    asked on November 13, 2011
  26. PreAlgebra

    If x=yz, which of the following must be equal to xy? a. yz b. yz^2 c. y^2z d. z^2\y

    asked on March 9, 2011
  27. Physics Concepts

    A father racing his son has one-third the kinetic energy of the son, who has two-fifths the mass of the father. The father speeds up by 1.5 m/s and then has the same kinetic energy as the son. What is the Father's initial speed? What is the Son's initial

    asked on March 5, 2011
  28. Physics

    Need help ASAP for this one, really hard. to Assignment 11Problem 13.26 Tuning Forks in Neurology Tuning forks are used in the diagnosis of nervous afflictions known as large-fiber polyneuropathies, which are often manifested in the form of reduced

    asked on November 19, 2009
  29. Math

    Find all $z$ such that \[(z+1)^7 = z^7.\]You do not have to put your answer in the simplest rectangular or exponential form.

    asked on September 7, 2018
  30. Alegbra 1

    The difference between the measures of two supplementary angles is 8˚. What is the measure of the larger angle? What is the measure of the smaller angle?

    asked on December 15, 2017
  31. Geometry- PLEASE HELP!!

    Point $G$ is the midpoint of median $\overline{XM}$ of $\triangle XYZ$. Point $H$ is the midpoint of $\overline{XY}$, and point $T$ is the intersection of $\overline{HM}$ and $\overline{YG}$. Find the area of $\triangle MTG$ if $[XYZ] =150$.

    asked on April 19, 2016
  32. Physics

    A 1000-kg aircraft going 25 m/s collides with a 1500-kg aircraft that is parked. They stick together after the collision and are moving at 10 m/s. If they skid for 30 seconds before stopping, how far (in meters) did they skid? Hint: Are the aircraft moving

    asked on January 30, 2016
  33. math

    A rectangular piece of carpet is place on the floor of a rectangular room leaving a margin of 1 m around it. If the room measures 8 m by 6 m find the area of the room not covered by the carpet.

    asked on March 10, 2015
  34. chemistry

    need formula to this. Carbon monoxide reacts with oxygen to produce carbon dioxide. If 3.0 Liters of carbon monoxide at STP, how many liters of oxygen are required to run the reaction

    asked on April 16, 2012
  35. AP Chemistry

    The solubility of solid Ce(IO3)3 in a 0.20 M KIO3 solution is 4.4 10-8 mol/L. Calculate Ksp.

    asked on December 4, 2011
  36. Physics

    A stone is dropped from a high altitude and 3 s later another stone is projected downward with a speed of 150 ft/s. When and where will the second stone overtake the first? Ans. (a) 5.70 s (b) 520 ft

    asked on September 24, 2011
  37. english

    need help with this Nominative Absolutes sentence "The town held a festival because the harvest had been so large.". is this right? The town held a festival the harvest been so large.

    asked on April 11, 2011
  38. Algebra I

    It is the grand opening of a local supermarket. Every 5th customer will receive a coupon for a free turkey and every 7th customer will receive a coupon for a free half gallon of ice cream. If 400 customers come in on opening day, how many people will get

    asked on February 8, 2018
  39. math

    In an elevator, you go up 3 floors and down 4 floors. Write an integer that represents the net change in your position.

    asked on January 25, 2018
  40. Statistics

    The weight of bags of pretzels are normally distributed with a mean of 150 grams and a standard deviation of 5 grams. Bags in the upper 4.5% are too heavy and must be repackaged. Also, the bags in the lower 5% do not meet the minimum weight requirement and

    asked on March 20, 2017
  41. Chemistry

    Consider two equally sized balloons at room temperature, one filled with oxygen gas and one filled with an unknown gas. If the balloon filled with oxygen gas deflates in 37 hours and the other balloon deflates in 26 hours, which of the following is the

    asked on December 10, 2016
  42. physics

    A bird watcher meanders through the woods, walking 0.744 km due east, 0.925 km due south, and 3.97 km in a direction 18.3 ° north of west. The time required for this trip is 1.765 h. Determine the magnitudes of the bird watcher's (a) displacement and (b)

    asked on August 14, 2015
  43. physics

    A bird watcher meanders through the woods, walking 0.544 km due east, 0.925 km due south, and 3.58 km in a direction 17.3 ° north of west. The time required for this trip is 1.957 h. Determine the magnitudes of the bird watcher's (a) displacement and (b)

    asked on August 12, 2015
  44. Physics

    3 kg object is fastened to a light spring with the intervening cord passing over a pulley. The pulley is frictionless and it's inertia may been neglected. The object is released from rest when the spring is unstretched. If the object drops 10 cm before

    asked on February 5, 2015
  45. physics

    A fire engine must lift 30 kg of water a vertical distance of 20 m each second. What is the amount of power needed for the water pump for this fire hose? P=W/t=Fd/t=mgd/t (30)(9.8)(20)/1= 5880 W is that right?

    asked on January 20, 2015
  46. math

    Today only a table is sold at a 28% discount. the sale price is now 666. what was the price yesterday?

    asked on January 8, 2012
  47. Statistics

    Recently, a case of food poisoning was traced to a particular restaurant chain. The source was identified and corrective actions were taken to make sure that the food poisoning would not reoccur. Despite the response from the restaurant chain, many

    asked on March 9, 2011
  48. physics

    How long does it take a plane, traveling at a speed of 170 m/s, to fly once around a circle whose radius is 2900 m?

    asked on October 23, 2010
  49. math

    Xavier worked 10 hours on Monday and 15 hours on Wednesday. His total pay was $280.00. What is his rate per hour?

    asked on June 15, 2009
  50. literature/poetry

    1. If this be error and upon me proved, I never writ, nor no man ever loved. These lines are an example of a/an A. quatrain. B. octet. C. couplet. D. sestet. 2. The line "I wandered lonely as a cloud" is an example of A. a metaphor. B. a simile. C. a

    asked on April 13, 2008
  51. statistics

    A bag contains 7 red marbles, 6 white marbles, and 10 blue marbles. You draw 4 marbles out at random, without replacement. What is the probability that all the marbles are red? What is the probability that exactly two of the marbles are red? What is the

    asked on May 23, 2020
  52. physics

    A supertanker (mass = 1.57E+8 kg) is moving with a constant velocity. Its engines generate a forward thrust of 7.47E+5 N. Determine the magnitude of the resistive force exerted on the tanker by the water. 7.47×10^N is correct, but I need to know how

    asked on December 6, 2017
  53. psychology

    Dr. Jefferson is conducting an experiment in which she is interested in the effects of caffeine on visuospatial ability in adult participants. She conducts an experiment in which she gives one group a pill containing 20mg of caffeine and a second group a

    asked on September 13, 2015
  54. Psychology

    A researcher has conducted an experiment in which she has given participants a placebo, 10mg, and 20mg of a drug. She then measured their anxiety, blood pressure, and heart rate in response to the drug. How many levels does this experiment’s independent

    asked on September 13, 2015
  55. Psy 326

    We use _______________ to communicate the patterns and distribution of our measured variables.

    asked on August 24, 2015
  56. Langauge Please Help

    The novel to kill a mockingbird feature a main character named scout. Scout is also the voice that tells the story. What point of view is used in the novel? A.First Person B.Third-Person Limited

    asked on August 11, 2015
  57. Chemistry

    What element forms an ion with an electronic configuration of [Xe] and a –2 charge?

    asked on October 28, 2012
  58. Chemistry

    A hot air balloon is filled with 1.39 × 106 L of an ideal gas on a cool morning (11 °C). The air is heated to 105 °C. What is the volume of the air in the balloon after it is heated? Assume that none of the gas escapes from the balloon.

    asked on October 16, 2012
  59. chemistry

    An ice cube of mass 10g at -10C is added to the beaker containing 150mL of water at 88.5C. Assuming no heat is lost to the surrounding; calculate the equilibrium temperature for the liquid after the ice melts.(Heat of fusion for H2O = 6.01 kJ/mol. Heat of

    asked on June 21, 2012
  60. math

    Managers should consider ethical aspects of their decisions because:

    asked on May 5, 2012
  61. AP Chem

    The following reaction has Kp = 109 at 25°C. 2 NO(g) + Br2(g) 2 NOBr(g) If the equilibrium partial pressure of Br2 is 0.0159 atm and the equilibrium partial pressure of NOBr is 0.0768 atm, calculate the partial pressure of NO at equilibrium.

    asked on January 8, 2012
  62. Chemistry

    Consider the following reaction. CH4(g) + 2 O2(g) CO2(g) + 2 H2O(l) ÄH = -891 kJ Calculate the enthalpy change for each of the following cases. 1.00 103 L methane gas at 719 torr and 26°C is burned in excess oxygen.

    asked on November 13, 2011
  63. statistics

    The average time to sew a pair of pants is 4.2 hours with a standard deviation of 30 minutes and if the distribution is normal then the probability of a worker finishing the pants in less than 3 hours is.

    asked on November 16, 2010
  64. History

    What are the two major functions of the Office of Management and Budget?

    asked on September 28, 2009
  65. calculus ab

    What is the integral of sin4xcos4x dx?

    asked on January 8, 2009
  66. english help please

    in the short story "gregory" by panos ioannides why does the author choose to use the title Gregory can someone please help me with the question thank you

    asked on November 11, 2008
  67. math

    For x+3/x-4 is less than or equal to 0, why is the interval notation [3,4)?

    asked on May 19, 2020
  68. Accounting

    How will the customer's bounced checks be handled on a bank reconciliation? a. add to the balance from the company records b. add to the bank statement balance c. subtract from the balance from the company records d. subtract from the bank statement

    asked on March 31, 2019
  69. Language arts

    In what way do the people actually "disappear" in "The City Is So Big"

    asked on January 24, 2019
  70. Physics

    A small ball of mass m is placed on top of a large ball of mass 3m. Both balls are dropped simultaneously from a height h = 5.50 m as shown in the figure. Assuming the radius of the large ball and small are small and thus negligible in comparison to the

    asked on July 11, 2018
  71. Alegbra 1

    Clay Potts owns a ceramic store. His brother Jack works for him. Jack earns wages of 50 dollars per day plus 10% of the profits. Clay gets the other 90% of the profits. On Monday the store makes a profit of 30 dollars. How much does Clay get?

    asked on February 5, 2018
  72. math

    tell whether each equation has one solution, zero solutions or infinite solutions 5(x-3)+6=5x-9

    asked on March 8, 2017
  73. World History

    (Need help with this prompt, just one paragraph will do) It is 1870, French forces leave Italy (to fight in the Franco-Prussian War) and Italians triumphantly declare Rome their united capital. You have been hired by Vittorio Emanuele II, the King of

    asked on March 4, 2017
  74. Geometry

    What's the lateral area of a right cylinder if the radius of the base is 12 mm and the altitude of the cylinder is 5 times the base radius?

    asked on December 29, 2016
  75. physics

    an initially resting 300g car is dragged along a horizontal frictionless table by a massless cord. The cord is attached to vertically hanging 60g mass by a frictionless massless pulley. If the car starts from rest, determine the time it would take for it

    asked on June 2, 2016
  76. Math

    If a person throws 3 darts at a dartboard, how many possible combinations are there to get a sum of 34?

    asked on January 5, 2016
  77. Chemistry (Titrations)

    In order to standardize a KMnO4 solution, 0.2848 g Fe(NH4)2(SO4)2·6H2O was dissolved in 25 mL 0.18 M H2SO4. The KMnO4 solution was added to the Fe(NH4)2(SO4)2·6H2O solution until a pale pink color persisted. The titration took 24.2 mL of KMnO4 solution.

    asked on November 30, 2014
  78. business statistics

    10.55 Consider an experiment with four groups, with eight values in each. For the ANOVA summary table below, fill in all the missing results: Source Degrees of Freedom Sum of Squares Mean Square (Variance) F Among groups c - 1 = ? SSA = ? MSA = 80 FSTAT =

    asked on November 27, 2014
  79. physics

    Rubber tires and wet blacktop have a coefficient of kinetic friction of 0.5. A pickup truck with a mass 750 kg traveling 30.0 m/s skids to a stop. (a) what is the size and direction of the frictional force that the road exerts on the truck? (b) Find the

    asked on November 11, 2014
  80. Econ

    When the law of diminishing returns applies, which of the following would rise with increased employment of labor, ceteris paribus? A. Fixed costs B. Marginal cost C. Marginal revenue D. The wage rate

    asked on November 3, 2013
  81. Chemistry

    How many milliliters of 1.0 M NaOH must be added to 200. mL of 0.10 M NaH2PO4 to make a buffer solution with a pH of 7.50? (5 points)

    asked on April 4, 2013
  82. physics

    A boy is pushing his sled up a snowy slope. The sled has a mass of 20.4 kg and weighs 200 N. The boy pushes with a constant force of 75 N. The sled travels a distance of 10 m and gains 3 m in height. When the sled reaches the top, it is traveling 2 m/s.

    asked on March 27, 2013
  83. Binomial Probability

    Before 1918, wolves were shown as 55% male, 45% female. From 1918 to present they were shown as 70% male and 30% female. In a random sample of 12 wolves, what was the probability that 6 were male? What was the probibility that 6 or more were female? What

    asked on November 10, 2012
  84. Science

    which of the following effects would also occur at the end of an Ice Age 1.) an increase in volcanic activity near the equator. 2.) a global rise in the sea level. 3.) a worldwide extinction of the reptiles. 4.)a shorte length of the day. 5.)a complete

    asked on January 13, 2012
  85. AP Chem

    At a particular temperature, Kp = 0.25 for the following reaction. N2O4(g) 2 NO2(g) (a) A flask containing only N2O4 at an initial pressure of 5.3 atm is allowed to reach equilibrium. Calculate the equilibrium partial pressures of the gases. (b) A flask

    asked on January 8, 2012
  86. AP Chem

    At a particular temperature, K = 1.00 102 for the following reaction. H2(g) + I2(g) 2 HI(g) In an experiment, 1.23 mol H2, 1.23 mol I2, and 1.23 mol HI are introduced into a 1.00 L container. Calculate the concentrations of all species when equilibrium is

    asked on January 8, 2012
  87. physics

    What is the total force on the bottom of a swimming pool 20.5 m by 8.0 m whose uniform depth is 2.1 m?

    asked on November 29, 2011
  88. Chemistry

    The combustion of 0.1583 g benzoic acid increases the temperature of a bomb calorimeter by 2.93°C. Calculate the heat capacity of this calorimeter. (The energy released by combustion of benzoic acid is 26.42 kJ/g.) A 0.1710 g sample of vanillin (C8H8O3)

    asked on November 13, 2011
  89. Chemistry

    Consider the dissolution of CaCl2. CaCl2(s) Ca2+(aq) + 2 Cl-(aq) ÄH = -81.5 kJ A 12.4 g sample of CaCl2 is dissolved in 100. g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the

    asked on November 13, 2011
  90. Math/Economics

    Suppose that a firm has only one variable input, labor, and firm output is zero when labor is zero. When the firm hires 6 workers it produces 90 units of output. Fixed cost of production are $6 and the variable cost per unit of labor is $10. The marginal

    asked on October 18, 2011
  91. College CHEM

    Name for Sn(BrO3)

    asked on September 12, 2011
  92. math

    how much force does 1000lbs have when drop from 36"

    asked on March 5, 2011

    How to determine the molarity of a 1.8% NaCl solution.

    asked on February 24, 2011
  94. Calc

    At noon, ship A is 100 Kilometers due east of ship B, Ship A is sailing west at 12 k/h, and ship B is sailing S10degrees west at 10k/h. At what time will the ships be nearest each other and what time will the distance be? (not a right triangle)?

    asked on October 31, 2010
  95. physics

    PLEASE HELP !!!!!!Find the acceleration reached by each of the two objects shown in figure below if the coefficient of kinetic friction between the 7.00 kg object and the plane is 0.250. I keep getting 3.9=a

    asked on September 13, 2010
  96. trig

    Is the somewhere where I could learn how to graph polar coordinates such as (1,pi/3)?

    asked on March 22, 2010
  97. Math

    Given:a and b are first-quadrant angles, sin a = 5/13 , and cos b = 3/5 , evaluate sin(a - b).

    asked on March 19, 2010
  98. math

    Explain why the scratch arithmetic algorithm works.

    asked on December 13, 2009
  99. Calculus

    The temperature of a cup of Starbucks coffee at time t (in minutes) is T(t)= 70 + c e^(-kt) . Initially, the temperature of the coffee was 200 degrees F. Three minutes later, it was 180 degrees. When will the temperature of the coffee be 150 degrees F? The

    asked on November 10, 2009
  100. albgrea

    my sister is 14 years older than i am. the sum of our ages is 50. find our ages

    asked on October 15, 2009


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