Most popular questions and responses by Henry
  1. Calculus

    A particle moves along the x-axis with velocity v(t) = sin(2t), with t measured in seconds and v(t) measured in feet per second. Find the total distance travelled by the particle from t = 0 to t = π seconds. Do I have to take the integral of the equation

    asked on February 21, 2016
  2. Social Studies

    How did the Supreme Court decision in Worcester v. Georgia and the Indian Removal Act lead to the removal and resettlement of Native American groups?

    asked on January 24, 2018
  3. Chemistry

    Methanol, a major industrial feedstock, is made by several catalyzed reactions, such as CO(g) + 2H2(g) ----> CH3OH (l) One concern about using CH3OH as an auto fuel is its oxidation in air to yield formaldehyde, CH2OH(g) which poses a health hazard.

    asked on October 29, 2015
  4. Calculus

    Pumping stations deliver gasoline at the rate modeled by the function D, given by D(t)= 6t/(1+2t) with t measure in hours and and R(t) measured in gallons per hour. How much oil will the pumping stations deliver during the 3-hour period from t = 0 to t =

    asked on February 21, 2016
  5. Calculus

    f(x) and g(x) are a differentiable function for all reals and h(x) = g[f(2x)]. The table below gives selected values for f(x), g(x), f '(x), and g '(x). Find the value of h '(1). (4 points) x 1 2 3 4 5 6 f(x) 0 3 2 1 2 0 g(x) 1 3 2 6 5 0 f '(x) 3 2 1 4 0 2

    asked on February 21, 2016
  6. Calculus

    The graph of f ′(x) is continuous and decreasing with an x-intercept at x = 0. Which of the following statements is false? (4 points) The graph of f has an inflection point at x = 0. The graph of f has a relative maximum at x = 0. The graph of f is

    asked on February 20, 2016
  7. Maths

    Hasim counted his money. he gave 1/3 to his brother. he spent £12 on his sister. What he had left was half what he had at the beginning. how much did he give his brother?

    asked on May 1, 2017
  8. AP Physics - Equilibrium

    The Achilles tendon is attached to the rear of the foot as shown in the figure below. When a person elevates himself just barely off the floor on the ball of one foot, estimate the tension Ft in the Achilles tendon (pulling upward) and the (downward) force

    asked on November 13, 2009
  9. Calculus

    The rate at which water flows into a tank, in gallons per hour, is given by a differentiable function R of time t. The table below gives the rate as measured at various times in an 8-hour time period. t---------0-----2------3-------7----8 (hours)

    asked on February 23, 2016
  10. English

    Could I get some check on my answers? Read these lines from Macbeth: The west yet glimmers with some streaks of day: Now spurs the lated traveller apace, To gain the timely inn; and near approaches The subject of our watch. Which of the following correctly

    asked on March 6, 2016
  11. Calculus

    Which of the following integrals cannot be evaluated using a simple substitution? I think it is A because if you would substitute there would be nothing left in the equation? Is that right? Options ∫√(x-1) ∫1/√(1-x^2) ∫x/√(1-x^2) ∫√(x^2-1)

    asked on January 2, 2016
  12. us history

    Roosevelt's New Deal differed from Hoover's administration in that the New Deal was willing to use government power to adjust the contending claims of major interests groups. Asses the validity of this generalization

    asked on March 15, 2012
  13. English

    I thought it was C for this Victor Frankenstein recounts the influences that lead to his great experiment: I feel exquisite pleasure in dwelling on the recollections of childhood, before misfortune had tainted my mind and changed its bright visions of

    asked on March 6, 2016
  14. AP Physics Halley's Comet

    Halley's comet orbits the sun roughly once every 76 years. It comes very close to the surface of the Sun on its closest approach. Estimate the greatest distance of the comet from the sun. Is it still in the Solar System? What planet's orbit is nearest when

    asked on October 2, 2009
  15. Calculus

    Compare the rates of growth of f(x) = x + sinx and g(x) = x as x approaches infinity. f(x) grows faster than g(x) as x goes to infinity. g(x) grows faster than f(x) as x goes to infinity. f(x) and g(x) grow at the same rate as x goes to infinity. The rate

    asked on February 20, 2016
  16. English

    I hear the mournful wail of millions, whose chains, heavy and grievous yesterday, are to-day rendered more intolerable by the jubilant shouts that reach them. Which definition of rendered is most likely suited for this line? Caused to be a certain nature

    asked on March 11, 2016
  17. Pre-Calculus

    A road sign at the top of a mountain indicates that for the next 4 miles the grade is 12%. Find the angle of the grade and the change in elevation for a car descending the mountain.

    asked on February 5, 2009
  18. AP Physics

    A girl is whirling a ball on a string around her head in a horizontal plane. She wants to let go at precisely the right time so that the ball will hit the target on the other side of the yard. When should she let go of the string?

    asked on September 24, 2009
  19. Chemistry

    A 500.0 mL sample of saturated nickel(II) phosphate solution was analyzed spectrophotometrically and found to contain 1.88 × 10-5 g of nickel. (a) Determine the molarity of the nickel(II) phosphate solution. (b) Calculate the solubility product constant,

    asked on February 19, 2015
  20. Economics help

    An elderly man receives free prescription drugs from a veterans' hospital. So what kind of a good is this, like is this a privately owned service or publicly own service?

    asked on December 4, 2014
  21. Physics

    If the coefficient of kinetic friction between a 35 kg crate and the floor is 0.30, what horizontal force is required to move the crate at a steady speed across the floor? What horizontal force is required if μk is zero?

    asked on December 4, 2012
  22. History

    How was James I's rule of England similar to peter the great's rule of Russia? Both reduces the size of their empire. Both increased their own power without approval by other government entitles. Both relied heavily on the opinions of their subjects when

    asked on March 27, 2014
  23. Chemistry

    The solubility of insoluble substances changes depending on the nature of the solution. Below are two solutions in which Cu(OH)2 is dissolved; in each case, the solubility of Cu(OH)2 in those solutions is not the same as it is in pure water. (a) For each

    asked on February 19, 2015
  24. math

    A farmer wishes to fence a rectangular area behind his barn. The barn forms one end of the rectangle and the length of the rectangle is three times the width. How many linear feet of fence must he buy if the perimeter of the rectangle is 320 feet? The

    asked on March 10, 2018
  25. chemistry

    What is pH of 0.1M solution of NH4Br, if the pKb of NH3 is 4.74?

    asked on November 9, 2012
  26. Calculus

    Which of the following functions grows the fastest as x goes to infinity? 3^x ln(x) e^4x x^10 I put e^4x but I thought that 3^x might have been it too. I know for sure that it is not ln(x) and x^10 because those grow much slower.

    asked on February 20, 2016
  27. chemistry

    what are the hydronium-ion and the hydroxide ion concentration of a solution at 25 C that is 0.0050 M strontium hydroxide, Sr(OH)2? a solution of hydrochloric acid is 0.20 M HCl. What is the hydronium-ion at 25 C? What is the hydroxide ion concentration at

    asked on August 6, 2011
  28. Math

    An invoice quotes a price of $620, subject to discount of 30%, 15%, and 5% what is the selling price

    asked on May 27, 2012
  29. Calculus

    Which of the following functions grows the slowest as x goes to infinity? x^e e^x ex they all grow the same rate. I think it is c because it does not have any exponents.

    asked on February 20, 2016
  30. Physics

    A 10.0 kg barrel is lifted by pulling up on a rope. The barrel accelerates at 1.50 m/s2. Find the force of tension on the rope.

    asked on December 21, 2014
  31. physics

    A train whistle is heard at 280Hz as the train approaches town. The train cuts its speed in half as it nears the station, and the sound of the whistle is then 270 Hz. What is the speed of the train before slowing down? What is the speed of the train after

    asked on January 21, 2015
  32. Physics

    A skateboarder travels on a horizontal surface with an initial velocity of 4.4 m/s toward the south and a constant acceleration of 2.0 m/s2 toward the east. Let the x direction be eastward and the y direction be northward, and let the skateboarder be at

    asked on September 28, 2018
  33. AP Physics - Fluids

    A 6.0-cm diameter horizontal pipe gradually narrows to 4.0 cm. When water flows through this pipe at a certain rate, the gauge pressure in these two sections is 32 kPa and 24 kPa, respectively. What is the volume rate of flow? I know to use Bernoulli's

    asked on November 20, 2009
  34. Geometry

    Find AX in the diagram if CX bisects angle ACB. And then there's a diagram below with triangle ABC, where X is on line C, BC=45, AC=21, and BX=30.

    asked on April 20, 2017
  35. English

    To forget them, to pass lightly over their wrongs, and to chime in with the popular theme, would be treason most scandalous. . . Which word is most similar to how chime in is used here? Agree Create Harmonize Resound I have no idea because chime in- means

    asked on March 11, 2016
  36. Calculus 2

    Sketch the region in the first quadrant enclosed by y=7/x, y=2x, and y=x/2. Decide whether to integrate with respect to x or y. Then find the area of the region.

    asked on February 9, 2016
  37. math

    a contractor's crew can frame 3 houses in a week. how long will it take them to frame 54 houses if they frame the same number each week?

    asked on September 27, 2015
  38. Chemistry

    a hydrocarbon is burnt completely in excess oxygen. it is found that 1.00g of the hydrocarbon gives 2.93g carbon dioxide and 1.80g water. find the empirical formula of the hydrocarbon (H=1,C=12,O=16)

    asked on May 10, 2018
  39. Calculus

    Show that f(x) = 2000x^4 and g(x) = 200x^4 grow at the same rate I know that they grow at the same rate because they are both raised to the same power, but i don't know how to show it.

    asked on March 4, 2016
  40. math

    A patio has the shape of the quadrilateral drawn in the picture below. 1) Find the area of the patio. 2) What is the minimum number of square-tiles with sides of 30 cm that are needed to cover the patio if 10% more tiles will be needed to cover the

    asked on March 7, 2019
  41. Pre cal

    1. An airplane flies 200 km on course 110 degrees from point A to point B. At point B the pilot changes course to 37 degrees. The plane then flies 100 km to point C. Find the magnitude of the net displacement from A to C. 2. A plane is flying on a bearing

    asked on May 15, 2014
  42. math

    a scooter is priced between $1000 and $2000. its price is a multiple of 10. All the digits in the price, except for the thousands digit, are even numbers. The value of the hundreds digit is 30 times the value of the tens digit. what is the price of the

    asked on October 26, 2015
  43. Calculus

    Determine if the Mean Value Theorem for Integrals applies to the function f(x) = 5 - x^2 on the interval 0 to sqrt 5 . If so, find the x-coordinates of the point(s) guaranteed by the theorem.

    asked on March 2, 2016
  44. Calculus

    Use the graph of f(t) = 2t + 3 on the interval [-3, 6] to write the function F(x), where F(x)= ∫f(t) dt where a=3 b=x. F(x) = 2x^2 + 6x F(x) = 2x + 3 F(x) = x^2 + 3x + 54 F(x) = x^2 + 3x - 18 Honestly have no idea where to start. Do i take the derivative

    asked on February 23, 2016
  45. English

    I think the answer is, because he is pretty much telling the people reform is needed. AFTER an unequivocal experience of the inefficiency of the subsisting federal government, you are called upon to deliberate on a new Constitution for the United States of

    asked on March 10, 2016
  46. physics

    A circuit is powered by a 5 V battery and has 0.2 A of current through it. If the circuit contains two resistors connected in series and one of the resistors has a resistance of 5 Ω, what is the resistance of the other resistor?

    asked on May 8, 2018
  47. science

    100.0g of 4.0c water is heated until its temperature is 37c. if the specific heat of water is 4.18 j/g c, calculate the amount of heat energy needed to cause this rise in temperature.

    asked on August 25, 2014
  48. geometry

    prove that every segment is congruent itself

    asked on January 3, 2019
  49. Business

    PLEASE HELP 1.Create a diagram of the U.S banking system and the Federal Reserve System(FRS). Include special financial services of the banking system in your diagram. Be creative in this activity. Pretend you have been asked to teach the structure and

    asked on March 22, 2018
  50. AP Physics - Work and Energy

    A projectile is fired at an upward angle of 45 degrees from the top of a 265-m cliff with a speed of 185 m/s. What will be its speed when strikes the ground below? (Use conservation of energy.) I have a diagram of it but I don't know what equations to use.

    asked on October 15, 2009

    The distinction between mass and weight was discovered after Jean Richer transported pendulum clocks from Paris to French Guiana in 1671. He found that they ran slower there quite systematically. The effect was reversed when the clocks returned to Paris.

    asked on November 6, 2008
  52. math

    By what percent will a fraction change if its numerator is decreased by 10% and its denominator is decreased by 50%?

    asked on May 5, 2018
  53. Chemistry

    Human bodies maintain their balance (homeostasis) through a series of equilibria. An important equilibrium involves calcium ion because Ca2+ is important for muscle contractions in the heart as well as for strong bones. Bone is a complex tissue consisting

    asked on February 19, 2015
  54. algebra

    An amusement park charges $8 admission and average of 2000 visitors per day. A survey shows that , for each $1 increase in the admission cost, 100 fewer people would visit the park. Write an equation to express the revenue, R(x) dollars, in terms of a

    asked on March 18, 2015
  55. Math

    A craft project requires 5/6 yards of ribbon to make 4 refrigerator magnets.How many inches of ribbon are needed for each magnet?

    asked on August 30, 2016
  56. Chemistry

    what is the pH of a 0.025 M aqueous solution of sodium propionate, NaC3H5O2? What is the concentration of propionic acid in the solution?

    asked on August 8, 2011
  57. AP Physics

    A rope is tied to a pail of water and the pail is swung in a vertical circle of radius 1.3m. What must be the minimum velocity of the pail at the highest point of the circle if no water is to spill?

    asked on September 24, 2009
  58. geometry

    Lines a and b are parallel. Line c is a transversal. Find the measures of all angles formed by a,b, and c, if: one of the angles is with 70° larger than the other one.

    asked on November 14, 2018
  59. Chemistry

    Help me with this; For the second part of the analysis,you will be provided with hydrated crystal of oxalic acid (H2C204. 2H2O). weigh out accurately about 1.575g of oxalic acid in a weighing bottle. Dissolve the acid in a beaker, then transfer the

    asked on June 17, 2018
  60. check geo

    a system in which monarchsd or lords gave land to nobles in return for pledges of loyalty was known as: A)industrial capitalism B)communism C)the middle Ages D)feudalism my choice:b

    asked on August 26, 2009
  61. language arts

    15 literary devices in chapter 17 of to kill a mockingbird

    asked on September 30, 2011
  62. chemistry

    What are the oxidation numbers for the elements in the compound C2H5COOH?

    asked on April 27, 2011
  63. chemistry

    How many milliliter of 0.150 M H2SO4 (sulfuric acid) are required to react with 1.87 g of sodium hydrogen carbonate, NaHCO3, according to the following equation? H2SO4 + 2NaHCO3 --> Na2SO4 + 2H2O + 2CO2 dont understand this am i suppose to change 1.87 into

    asked on July 23, 2011
  64. algebra

    A rectangular lot is bordered on one side by a stream and on the other three sides by 600m of fencing. Find the dimensions of the lot if area is a maximum.

    asked on March 18, 2015
  65. chemistry

    4FeCr2O4+ 8K2CO3+7O2= 2Fe2O3+8K2CrO4+8CO2 how many grams of FeCr2O3 are required to produce 44g of CO2?

    asked on January 25, 2010
  66. math

    What is the area of the largest rectangle with lower base on the x-axis and upper vertices on the curve y equals 27 minus x^2?

    asked on March 6, 2015
  67. Calculus 2

    A farmer wishes to build a fence for 6 adjacent rectangular pens. If there is 600 feet of fencing available, what are the dimensions of each pen that maximizes total pen area? I keep getting x=150 but I have been told that is not enough fencing. Can anyone

    asked on April 10, 2013
  68. chemistry

    A 200.0 mL flask contains 1.03 mg of O2 and 0.41 mg HE at 288K. Calculate the partial pressure of oxygen and helium in the flask. What is the total pressure?

    asked on August 4, 2011
  69. AP Physics - Linear Momentum

    During a Chicago storm, winds can whip horizontally at speeds of 100 km/h. If the air strikes a person at the rate of 40 kg/s per square meter and is brought to rest, estimate the force of the wind on a person. Assume the person is 1.50m high and 0.50m

    asked on October 16, 2009
  70. Chemistry

    a sample of natural gas is 85.2% methan, CH4, and 14.8% ethane, C2H6, by mass. What is the density of this mixture @ 18C and 748mmHg. so i know that i have to use this formula d=(PM)/(RT) but i don't know how to convert the percentages into g/mol

    asked on August 4, 2011
  71. chemistry

    The element copper has naturally occuring isotopes with mass numbers of 63 and 65. The relative abundance atomic masses are 69.2% for mass=62.93 amu, and 30.8% for mass=64.93 amu. Calculate the average atomic mass of copper.

    asked on September 7, 2009
  72. geometry

    The difference of the same side interior angles of two parallel lines is 50°. Find the measures of these two angles. Answer: ______ &______

    asked on November 14, 2018
  73. math

    One side of a rectangle is five times as long as the other side. If the perimeter is 72 meters, what is the length of the shorter side? ___ meters

    asked on March 10, 2018
  74. AP Physics - Work, Energy, Power

    A driver notices that her 1150-kg car slows down from 85 km/h to 65 km/h in about 6 seconds on the level when it is in neutral. Approximately what power (watts and hp) is needed to keep the car traveling at a constant 75 km/h?

    asked on October 16, 2009
  75. geo check

    a fine rich soil that is carried by the wind is known as: A)bauxite B)loess C)polder D)mistral im not sure it either b or d maybe d

    asked on August 24, 2009
  76. General Chemistry

    Ferric Hydroxide, Fe(OH)3, is an insoluble salt with a solubility of 10^-39. 1) What is the maximum concentration of ferric hydroxide that can dissolve? 2) Using Le Chatalier's Principle, explain why iron (III) solutions are more soluble in acidic

    asked on May 20, 2016
  77. AP Physics - Equilibrium

    Describe several situations in which an object is not in equilibrium even though the net force on it is zero. I can't think of a single one. I can think of the opposite (equilibrium with net force not being zero) but I don't get it the other way around.

    asked on October 29, 2009
  78. geometry

    Lines a and b are parallel. Line c is a transversal. Find the measures of all angles formed by a,b, and c, if: one of the angles has measure of 150°.

    asked on November 14, 2018
  79. math

    Find the area of a square with side A when a is equal to the following values. Are the area of a square and the length of its side directly proportional quantities? Why or why not? A=8 cm. The area of the square is _______ square cm. The area of the square

    asked on November 1, 2018
  80. physics

    The positive and negative plates of a parallel-plate capacitor have an area of 1.05 cm by 1.05 cm. Their surface charge densities are +1.00×10-6 C/m2 and -1.00×10-6 C/m2, respectively. A proton moving parallel to the plates enters the middle of the space

    asked on January 24, 2017
  81. physics

    Two cars leave the same point at the same time, each travelling at the same constant speed and each having the same mass. The first car drives directly east, while the second car heads directly north. If the centre of mass of the two-car system is

    asked on November 8, 2011
  82. Math

    A chef buys 9 cucumbers 18 peppers and 21 tomatoes at the farmers market how much does she spend

    asked on October 29, 2018
  83. math

    what property is described in this equation: 24x5=(20x5)+(4x5)

    asked on December 2, 2013
  84. Math

    "How many different equivalent expressions for a particular number can be found?" Various constraints can be (and need to be) applied, such as the use of integers only, the number of expressions listed, a restricted choice of digits, or operations etc.

    asked on January 9, 2009
  85. Mathematics

    A single cell divides in two every 5 minutes and each new cell continues to divide every 5 minutes. How long does it take for the cell population to reach at least 1 million?

    asked on February 26, 2018
  86. biology

    1)Can you suggest reasons why a phylogeny based on molecular evidence and a phylogeny based on morphology and other evidence might not be exactly the same? 2) Zoologist worldwide are sequencing a mitochondrial gene CO1 (cyctochrome c oxidase subunit),

    asked on January 27, 2017
  87. Chemistry (concentrations)

    A liquid mixture has 12.6 parts per thousand of MgCl2 dissolved. Calculate the [Cl-] in ppt? Im stuck plz help!

    asked on September 7, 2014
  88. check geo

    when ___ the african slave trade greatly increased. a)AFRICANS BEGAN TO SHIP slaves to europe B)europeans needed more workers in the americas C)isalmic traders replaced europeans traders in western africa D)africans took arabs across the sahara. my choose

    asked on September 10, 2009
  89. chemistry

    what is the volume occupied by 2 moles of ammonia at s.t.p(1mole of gas at s.t.p=22.4)

    asked on May 4, 2015
  90. World History

    What role did the Jacobins play in the French Revolution? The Jacobins reached an agreement with moderate French leaders to end the revolution. The Jacobins opened French gov't to full participation by women. The Jacobins returned France to a monarchy by

    asked on March 27, 2014
  91. literature

    When did the book To Kill a Mockingbird take place? Harper Lee wasn't specific about the dates, but apparently it took place in the mid 1930s. Check this background out. http://www.sparknotes.com/lit/mocking/context.html Yes, that's what I thought.

    asked on December 27, 2006
  92. Biology

    Codominance is a form of inheritance in which two different alleles for a gene are both expressed, and neither allele is dominant over the other. The alleles for type A blood and type B blood are codominant. If a man who is homozygous for type A blood and

    asked on July 6, 2017
  93. Science(physics)

    A boy while driving to his school covers at the average speed of 15km/h.On his return trip along the same route, covers at the average speed of 25km/h due to less traffic.What is the average speed for the whole trip

    asked on January 8, 2017
  94. Economics calculation help

    Kelly total income last year was $24,000, but she could deduct $12,000 for various reasons. How can I calculate; If she had to pay 15% of her taxable income in federal income tax, what was her total tax payment? So I did 12,000 x .15 and got 1800, but I

    asked on December 4, 2014
  95. Chemistry

    What is the freezing point (°C) of a solution prepared by dissolving 11.3 g of Ca(NO3)2 in 115 g of water? The molal freezing point depression constant for water is 1.86°C/m. (Note that when Ca(NO3)2 dissolves in water Ca2+ and NO32- ions are produced).

    asked on May 25, 2012
  96. world geo

    in kazakhstan ______ led to radiation pollution. A)nuclear weapons B)biological weapons testing C)weapons transport system my choose is a. oil well fires ____ during the persian gulf war. A)threanted millions of birds B)destroyed millions of gallons of oil

    asked on September 4, 2009
  97. english

    Which statement best describes the character of Nathalie? A. She is a flat character because her goal is to marry Brantain for his money. B. She is both flat and dynamic because she loves one man and marries another. C. She is a dynamic character because

    asked on September 24, 2018
  98. Geometry

    A cone has diameter 12 and height 9. A cylinder is placed inside the cone so the base of the cylinder is concentric with the base of the cone and the upper base of the cylinder is contained in the surface of the cone. If the volume of the cone is nine

    asked on May 9, 2017
  99. Calculus

    Find the range of the function ∫sqrt(4-t^2) dt where a=0 =x [0, 4π] [0, 2π] [-4, 0] [0, 4]

    asked on March 4, 2016
  100. physics

    At 15 minutes past the hour, a 50 g mouse runs up a grandfather clock and sits himself down at the end of the minute-hand. If the minute-hand for the clock is 16 cm long, what is the magnitude of the torque exerted by the mouse on the minute-hand? Give

    asked on November 15, 2011


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