Most popular questions and responses by Mary
  1. Microeconomics

    ADVANCED ANALYSIS Assume the following values for Figures 5.4a and Figures 5.4b. Q1 = 20 bags. Q2 = 15 bags. Q3 = 27 bags. The market equilibrium price is $45 per bag. The price at a is $85 per bag. The price at c is $5 per bag. The price at f is $59 per

    asked on January 19, 2013
  2. Math

    350 is 70% of what number? A) 500 B) 420 C) 245 D) 280 What percent of 64 is 24? A) 267% B) 62.5% C) 40% D) 37.5% What percent of $6.50 is $2.60? A) 25% B) 40% C) 90% D) 250% 20% of 140 is what number? A) 280 B) 120 C) 28 D) 12

    asked on January 8, 2016
  3. International Econ.. Please Help!

    Practical dicussion of trade policy is dominated by considerations of income distribution. How does trade policy affect income distribution in a country? Discuss.

    asked on July 26, 2010
  4. Chemistry/hydrolysis of ATP

    Cells use the hydrolysis of ATP as a source of energy. The conversion of ATP to ADP has a standard free energy change of -30.5 kJ/mol. If all the free energy from the metabolism of glucose. C6H12O6(s)+6O2(g)¨6CO2(g)+6H2O(l) goes into the conversion of

    asked on August 28, 2008
  5. American Government

    Check answers? 1) What is the main difference between the formal and informal qualifications for the House of Representatives? A) Formal qualifications are outlined in the Constitution**** B) Formal qualifications do not have to be followed C) Informal

    asked on October 7, 2016
  6. Ela

    Can you help me with the final check:Relating to Parents chapter 17

    asked on October 25, 2016
  7. Physics

    A cylinder is fitted with a piston, beneath which is a spring, as in the drawing. The cylinder is open at the top. Friction is absent. The spring constant of the spring is 4100 N/m. The piston has a negligible mass and a radius of 0.023 m. (a) When air

    asked on April 24, 2007

    how did the supreme court decision in Worcester V.Georgia and the Indian removal act lead to the removal and resettlement of native Americans groups? Can anyone help me with this please?

    asked on February 16, 2018
  9. LA

    8. Whose attitude toward Scrooge is the most severe? (1 point) Marley's Bob Cratchit's the Ghost of Christmas Present's Mrs. Cratchit's

    asked on May 23, 2016
  10. science

    how is the equator similar to the prime meridian A. both the prime meridian and equator are lines that divide earth into norther and southern hemispheres B. both the prime meridian and equator are imaginary base lines from which locations of earth can be

    asked on May 14, 2014
  11. Chemistry

    1) How does the atomic radius change from left to right across a period in the periodic table? A) It tends to decrease*** B)It tends to increase C) It first increases, then decreases D) It first decreases, then increases 2) What is the charge of a cation?

    asked on October 18, 2016
  12. physics emergency

    m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with

    asked on November 4, 2011
  13. Chemistry

    Check answers? 1) Why did J.J. Thomson reason that electrons must be a part of the atoms of all elements? A) Cathode rays are negatively charged particles**** B) Cathode rays can be deflected by magnets C) An electron is 2000 times lighter than a hydrogen

    asked on October 7, 2016
  14. Chemistry

    1.9 mol HCl and 3.8 mol NaOH react according to the equation HCl + NaOH −→ NaCl + H2O . Calculate the amount in moles of NaCl formed. Answer in units of mol

    asked on February 9, 2012
  15. physics

    a 20 g ball of clay traveling east at 2.0 m/s collides with a 30 g ball of clay traveling 30m degrees south of west at 1.0 m/s. what are the speed and direction of the resulting 50 g of clay?

    asked on June 28, 2010
  16. Chemistry

    Kc for the reaction of hydrogen and iodine to produce hydrogen iodide, H2(g)+I2(g)f 2HI(g) is 54.3 at 430C. What will the concentrations be at equilibrium if we start with 0.240M concentrations of both H2 and I2?

    asked on November 29, 2011
  17. prealgebra

    At the same time that a 60-foot tall building casts a shadow that is 21.5 feet long, a nearby tree casts a shadow that is 18 feet long. Which measure is closest to the height of the tree?

    asked on August 15, 2012
  18. math 5th grade

    Victoria has 2 pounds of flour she uses 2/5 of flour for pizza and 3/10 of the flour for bread. Find the weight of the flour she has left. Express in decimal form. I worked on this and the answer I came up with was 19.2 lbs left?

    asked on November 19, 2015
  19. Physics

    A sled is being held at rest on a slope that makes an angle (theta) with the horizontal. After the sled is released, it slides a distance (d1) down the slope and then covers the distance (d2) along the horizontal terrain before stopping. Find the

    asked on October 13, 2011
  20. U.S. and Global Economics

    The owner of a flower shop needs a short-term loan to tide her business over until she completes the sale of some unused property. She asks the bank for a $25,000 six-month loan. The bank agrees to give her the loan, but attaches a hefty interest rate of

    asked on November 11, 2013
  21. Social Studies

    1. When people talk about natural resources, they usually mean (1 point) vegetation. water. minerals. all of the above•• 2. Geothermal energy is considered a (1 point) fossil fuel. renewable resource.•• nonrenewable resource. recyclable resource.

    asked on November 30, 2015

    An unknown salt is either KBr, NH4Cl, KCN, or K2CO3. If a 0.100 M solution of the salt is neutral, what is the identity of the salt?

    asked on February 16, 2012
  23. math

    Suppose you are looking to buy a $5000 face value 26-week T-bill. If you want to earn at least 1% interest, what is the most you should pay for the T-bill?

    asked on July 18, 2012
  24. Physic please help!

    The electrons in the beam of a television tube have a kinetic energy of 2.10 10-15 J. Initially, the electrons move horizontally from west to east. The vertical component of the earth's magnetic field points down, toward the surface of the earth, and has a

    asked on September 29, 2007
  25. Social Studies

    1. People's occupations, their behavior, and their beliefs are a part of their (1 point) government. climate. technology. culture.•• 2. When geographers study human-environment interaction, they learn (1 point) how schools are run. how people and their

    asked on November 29, 2015
  26. Physics

    When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 75 kg man just before contact with the ground has a speed of 7.0 m/s. (a) In

    asked on March 4, 2007
  27. Calculus

    An airplane is flying in still air with an airspeed of 325 miles per hour. If it is climbing at an angle of 20°, find the rate at which it is gaining altitude.

    asked on September 29, 2011
  28. Chemistry help please

    i need some help understanding this problem please. How many moles of O are there in 32.4g N2O5, how many oxygen and nitrogen atoms are there in the 32.4g?

    asked on March 31, 2012
  29. Physics

    The hammer throw is a track-and-field event in which a 7.30-kg ball (the hammer) is whirled around in a circle several times and released. It then moves upward on the familiar curved path of projectile motion and eventually returns to the ground some

    asked on October 7, 2011
  30. Math

    Adam drew two same size rectangles and divided them into the same number of eqal parts. He shaded 1/3 of one rectangle and 1/4 of the other rectangle. What is the least number of parts into which both rectangles could be divided?

    asked on January 24, 2013
  31. physics

    a uniform beam 6.0 metre long and weighing 4kg rests on support at p and q placed left and right 1.0 metres from each end of the beam weights of mass 10 kg and 8kg are placed near p and q respectively one each end of the beam.calculate the reaction at p

    asked on February 1, 2016
  32. chemisty

    How many moles of molecules are there in 250 grams of hydrogen nitrate?

    asked on January 15, 2010
  33. AP Physics

    A light string that is attached to a large block of mass 4m passes over a pulley with negligible rotational inertia and is wrapped around a vertical pole of radius r. The system is released from rest, and as the block descends the string unwinds and the

    asked on February 18, 2008
  34. chemistry

    how many grams of NaCl (molecular weight 58.5) should be used to prepare 20 liters of a solution containing 154mEq/L?

    asked on February 27, 2011
  35. calculus

    let f be the function f(x) = x^3 + 3x^2 - x + 2 a. the tangent to the graph of f at the point P = (-2,8) intersects the graph of f again at the point Q. Find the coordinates of point Q. b. Find the coordinates of point R, the inflection point of the graph

    asked on March 23, 2010
  36. Physic please check

    A constant magnetic field passes through a single rectangular loop whose dimensions are 0.35 m x 0.55 m. The magnetic field has a magnitude of 2.1 T and is inclined at an angle of 55° with respect to the normal to the plane of the loop. (a) If the

    asked on November 5, 2007
  37. english

    I need to combine the following sentence by changing the Italicized group of words into a gerund or gerund phrase. Then write the complete sentence using (prepositional phrase with a gerund object) I watch for the sales. This way I save money.

    asked on April 8, 2011
  38. ap chem

    The allene molecule has the following Lewis structure: H2C=C=CH2. Are all four hydrogen atoms in the same plane? The allene molecule has the following Lewis structure: H2C=C=CH2. Are all four hydrogen atoms in the same plane? If not, what is the spatial

    asked on December 28, 2012
  39. physics

    A 30.0-kg child sits on one end of a long uniform beam having a mass of 20.0 kg, and a 43.0-kg child sits on the other end. The beam balances when a fulcrum is placed below the beam a distance of 1.10 m from the 30.0-kg child. How long is the beam?

    asked on July 9, 2015
  40. Physics

    The question is: A small block of ice at 0oC is subjected to 10 g of 100oC steam and melts completely. Show that the mass of the block of ice can be no more than 80 g. There were no equations in my chapter to use for this question except Q ~ change in T. I

    asked on September 23, 2009
  41. math

    Carlos Martin received a statement from his bank showing a balance of $56.75 as of March 15th. His checkbook shows a balance of $87.37 as of March 20. The bank returned all cancelled checks but two. One check was for $5.00 and the other was for $13.25. How

    asked on August 10, 2010
  42. Physics

    Two cars, A and B, travel in a straight line. The distance of A from the starting point is given as a function of time by xA(t)=αt+βt^2, with α=2.60m/s and β=1.20m/s^2. The distance of B from the starting point is xB(t)=γt^2−δt^3, with γ=2.80m/s^2

    asked on September 7, 2014
  43. Physics

    Consider three identical metal spheres, A, B, and C. Sphere A carries a charge of -8q. Sphere B carries a charge of +7q. Sphere C carries no net charge. Spheres A and B are touched together and then separated. Sphere C is then touched to sphere A and

    asked on August 28, 2007
  44. SS

    how did Alexander Hamilton plan to pay off the national debt? by creating a population tax by printing new currency by taxing imports** by increasing exports

    asked on November 1, 2016
  45. U.S. and Global Economics: Involving MATH

    PLZZZ.. Help I just don't understand how to calculate this A landlord wants to acquire an additional apartment building for $250,000. The new building contains eight apartment units, which will each rent for $500 per month. The bank is willing to loan the

    asked on November 13, 2013
  46. lifes orientation

    To what extent can intrapersonal conflict affect choice of a career

    asked on March 8, 2015
  47. Physics

    1 kg block of ice at 0 degrees celsius placed in cooler. How much heat will the ice remove as it melts to water at 0 degree celsius. I know the answer is 80kcal but don't know the math that backs up the answer-please help!

    asked on June 30, 2009
  48. math

    angle PQR and angle TQV are vertical angles. The measure of the two angles have a sum of 100*. Write and solve an equation to find x, the measure of angle TQV.

    asked on May 16, 2016
  49. Algebra

    In chemistry, n molecules of an ideal gas have pressure (P), volume (V), and temperature (T) that stand in the following relation, where R is a constant. PV = nRT If you solve for n what would be a good equation? I came up with n=PV/RT Some other choices

    asked on April 26, 2011
  50. chemistry

    A sample of potassium hydrogen oxalate, KHC2O4, weighing 0.717 g, was dissolved in water and titrated with 18.47 mL of an NaOH solution. Calculate the molarity of the NaOH solution.

    asked on April 27, 2015
  51. Physics

    A person is making homemade ice cream. She exerts a force of magnitude 17 N on the free end of the crank handle, and this end moves in a circular path of radius 0.28 m. The force is always applied parallel to the motion of the handle. If the handle is

    asked on February 23, 2007
  52. college--physics

    On vacation, your 1400 kg car pulls a 560 kg trailer away from a stoplight with an acceleration of 2.20. What is the net force exerted by the car on the trailer?What force does the trailer exert on the car? What is the net force acting on the car?

    asked on September 23, 2009
  53. math

    Half of Sarah's wire is equal to 2/5 of Daniels. Chris has 3 times as much as Sarah. In all, their wire measures 6 ft. How long is Sarah's wire in feet?

    asked on May 27, 2015
  54. Physics

    How much does it cost to operate a 23-W porch light for 24 h if electric energy costs 8¢/kWh?

    asked on February 17, 2017
  55. Physics

    a system consists of four particles how many terms appear in the expression for the total gravitational potential energy of the system

    asked on October 22, 2011
  56. Physics

    Particles of charge +65, +48, and −95 μC are placed in a line. The center one is L = 60cm from each of the others.Calculate the net force on the left charge due to the other two.

    asked on January 31, 2015
  57. science

    An airplane flies due north at 235 km/h relative to the air. There is a wind blowing at 65 km/h to the northeast relative to the ground. What are the plane's speed and direction relative to the ground?

    asked on September 16, 2012
  58. chemistry

    How does Le Chatelier's principle explain the result you obtained when you added HCL to a suspension of Ca(OH)2 in water? Where the result was, precipiatate dissappeared and an increase in temperature resulted.

    asked on October 9, 2011
  59. Chemistry-Bonding

    Classify the following bonds as ionic, covalent, or neither (O, atomic number 8; F, atomic number 9; Na, atomic number 11; Cl, atomic number 17; U, atomic number 92). a.) O with F _________ b.) Ca with Cl __________ c.) Na with Na _________ d.) U with Cl

    asked on November 13, 2009
  60. math

    the average annual rainfall for a town is 43.2 inches. I know the monthly rainfall has to be 3.6 inches. the difference of a given month's rainfall from the average monthly rainfall is called the deviation. what is the deviation for each month shown? may 2

    asked on January 17, 2015
  61. Chemistry

    At high temperatures, sulfur combines with iron to form the brown-black iron (II) sulfide: Fe (s) + S (l)--> FeS (s) How do you calculate the mass of FeS formed? Thank you!

    asked on June 25, 2011
  62. physics help

    A 10 g bullet moving at 370 m/s strikes a ballistic pendulum of mass 2kg. The bullet emerges with a speed of 100 m/s. What height does the pendulum rise to? I don't want the answer, i just need hints!!! thnaks

    asked on November 18, 2011
  63. Physics

    A woman on a bridge 90.0m high sees a raft floating at a constant sped on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 6.00m more to travel before passing under the bridge. The stone

    asked on December 28, 2008
  64. Statistics

    12.34 Screening job applicants. A company retains a psychologist to assess whether job applicants are suited for assembly-line work. The psychologist classifies applicants as one of A (well suited), B (marginal), or C (not suited). The company is concerned

    asked on May 30, 2015
  65. Chemistry

    These are the answers I got for the following problems - am I right? 1) How many grams of water, H2O, and propene, C3H6, can be formed from the reaction of 6.0 g of 2-propanol, C3H8O? C3H8O ----> C3H6 + H2O 1.8g H2O and 4.2g C3H6 2) How many moles of

    asked on November 29, 2009
  66. Probaility

    The rates of on time flights for commercial jets are continuously tracked by the US Department of Transportation. Recently, Southwest Air had the best rate of 80% of its flight time on time. A test is conducted by randomly selecting 15 southwest flights

    asked on December 5, 2006
  67. math

    In the following, write an expression in terms of the given variables that represents the indicated quantity: a. The cost of having a plumber spend h hr at your house if the plumber charges $30 for coming to the house and $x per hour for labor b. The

    asked on August 18, 2012
  68. Math

    Sharon made a scale drawing of a triangular park. The coordinates for the vertices of the park are: (– 10, 5) (15, 5) (10, 12) Her scale is 1 unit = 1 meter. What is the area of the triangular park in square meters? How do you find the answer?

    asked on May 21, 2015
  69. Math

    At Strawberry State College, the ratio of females to males is 2:1. If there are 2400 students, how many are female and how many are male?

    asked on October 28, 2013
  70. Economics

    a firm in a purely competitive industry is currently producing a 1000 unir per day at a total cost of $450. if the firm produced 800 units per day, it total cost will be $300, and it it produced 500 units per day, it total cost will be $275. Requirements:

    asked on January 27, 2013
  71. Physics please check

    The "karat" is a dimensionless unit that is used to indicate the proportion of gold in a gold-containing alloy. An alloy that is one karat gold contains a weight of pure gold that is one part in twenty-four. What is the volume of gold in a 20.0 karat gold

    asked on April 9, 2007
  72. math statistics

    An English teacher needs to pick 10 books to put on her reading list for the next school year, and she needs to plan the order in which they should be read. She has narrowed down her choices to 5 novels, 5 plays, 4 poetry books, and 7 nonfiction books.

    asked on February 7, 2019
  73. SS 1 QUESTION PLZ HELP do Canada's native people intend to preserve their cultures? A. by coming independent nations B. by moving away from reserves*** C. by working with existing governments D. by using English on the street signs in their communities

    asked on January 26, 2016
  74. chemistry

    what volume of oxygen gas is needed to completely combust 0.202 L of butane (C4H10) gas?

    asked on April 8, 2010

    A buffer, consisting of H2PO4− and HPO42−, helps control the pH of physiological fluids. Many carbonated soft drinks also use this buffer system. What is the pH of a soft drink in which the major buffer ingredients are 7.20 g of NaH2PO4 and 4.90 g of

    asked on March 3, 2012
  76. Physics

    A 3.2 kg block is hanging stationary from the end of a vertical spring that is attached to the ceiling. The elastic potential energy of this spring/mass sytem is 2.2 J. What is the elastic potential energy of the system when the 3.2 kg block is replaced by

    asked on April 2, 2007
  77. Math

    The tile store has three different brown tiles mr Jacobs can use. The tile prices are shown in the table. Which tile can he purchase to stay in his budget and meet the design for 38 tiles? His budget is $1200.00

    asked on April 16, 2016
  78. physics

    A cubical block of density rB and with sides of length L floats in a liquid of greater density rL. (a) What fraction of the block’s volume is above the surface of the liquid? (b) The liquid is denser than water (density rW) and does not mix with it. If

    asked on February 3, 2016
  79. Physics

    The drawing shows two surfaces that have the same area. A uniform magnetic field B fills the space occupied by these surfaces and is oriented parallel to the yz plane as shown. If = 17°, find the ratio xz/ xy of the magnetic fluxes that pass through the

    asked on October 11, 2007
  80. Math

    Zoe keeps track of the miles per gallon her car gets per week. She has accumulated the following data: (1, 24), (2, 24.38), (3, 24.76), (4, 25.14) A. The common difference is 0.38 B. The common difference is 0.76 C. The common ratio is 0.99 D. The common

    asked on November 10, 2015
  81. Chemistry

    Calculate the ratio of the effusion rate of oxygen gas (O2) to that of nitrogen gas (N2). Express your answer in decimal form and calculate your answer to at least four sig figs.

    asked on September 23, 2010
  82. French

    Check answers? 1) Write a comparative sentence: La tortue est intelligente mais le poisson est tres intelligent. A) La tortue est moins intelligente que le poisson.*** B) La tortue est aussi intelligente que le poisson. C) La tortue est plus intelligente

    asked on October 10, 2016
  83. CAL-Help on dr/dt

    A circular oil slick of uniform thickness is caused by a spill of 1 cubic meter of oil. The thickness of the oil is decreasing at the rate of 0.1 cm/hr as the slick spreads. (Note: 1 cm = 0.01 m.) At what rate is the radius of the slick increasing when the

    asked on December 29, 2014
  84. Calculus

    The population of a colony of bacteria is modeled by the function p(x)=50(e^-x - e^-x^2)+10 ,for 0 ≤ x, where population P is in thousands, x is in hours, and x = 0 corresponds to the moment of introduction of a certain chemical into the colony's

    asked on October 16, 2014
  85. U.S. Government and Politics

    Describe how subjectivity and other factors affect a person's calculation of cost and benefit. Give an example of a cost-benefit analysis.

    asked on September 25, 2013
  86. physics

    A chair of weight 150 lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of = 38.0 directed at an angle of 41.0 below the horizontal and the chair slides along the floor.Using Newton's laws, calculate , the

    asked on September 23, 2009
  87. Chemistry

    1) The letter "p" in the symbol 4p^3 indicates the ___. A) spin of an electron B) orbital shape*** C) principal energy level D) speed of an electron 2) If the spin of one electron in an orbital is clockwise, what is the spin of the other electron in that

    asked on October 10, 2016
  88. Physics warming a nail

    2.) Pounding a nail into wood makes the nail warmer. Consider a 5-g steel nail 6 cm long and a hammer that exerts an average force of 500 N on the nail when it is being driven into a piece of wood. The nail becomes hotter. Show that the increase in the

    asked on September 20, 2009

    A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = 2.5 N/C, Ey = Ez = 0. If the velocity of the particle at t = 0 is given by vy = 50 m/s, vx = vz = 0, what is the speed of the

    asked on April 29, 2015
  90. Physics please check

    Three moles of an ideal monatomic gas are at a temperature of 345 K. Then, 2531 J of heat are added to the gas, and 1101 J of work are done on it. What is the final temperature of the gas? delta U= 3/2nR(T final -T initial) (2531J - 1101J) =

    asked on April 15, 2007
  91. algebra

    Describe a situation that models a linear pattern and then describe a situation that models a nonlinear pattern. Do not state which situation is linear and which is nonlinear. Your classmates will need to determine which is which and then write a function

    asked on October 26, 2018
  92. math

    78, 69, 45, 89, 74, 37, 99, 77, 100, 82. What is the interquartile range of these scores?

    asked on November 19, 2016
  93. U.S. and Global economics; involving math problems

    I've been working on this problem for "hours" and I can't quite figure out how to solve it; can anyone help plzzz? I would appreciate it. :) Two college students went on spring break to Guadalajara, Mexico. One took the vacation in 2002, while the other

    asked on November 11, 2013
  94. finance

    Orbital Communications has operating plants in over 100 countries. It also keeps funds for transaction purposes in many foreigh countries. Assume tha tin 2010 it held 100,000 kronas in Norway worth $35,000. The funds drew 12 percent interest, and the krona

    asked on May 26, 2011
  95. Science

    a bus trip covers 191 km and takes 4 hours and 15 miniutes. What is the average speed of the bus in kilometers per hour?

    asked on November 2, 2011
  96. Physics

    On a winter day the temperature drops from -5 degree C to -15 degree C overnight. If a pan sitting outside contains 0.40kg of ice, how much heat is removed from the ice for the temperature change? (specific heat (ice) = .5kcal/kg) Is it 02.0kcal?

    asked on July 9, 2010
  97. Calculus

    The population of a colony of bacteria is modeled by the function p(x)=50(e^-x - e^-x^2)+10 , for 0 ≤ x, where population P is in thousands, x is in hours, and x = 0 corresponds to the moment of introduction of a certain chemical into the colony's

    asked on October 16, 2014
  98. Physics please check

    An electric clock is hanging on the wall in the living room. The clock is unplugged, and the second hand comes to a halt over a brief period of time. During this period, what is the direction of the angular acceleration of the second hand? a. clockwise b.

    asked on April 24, 2007
  99. physics

    A particular tower clock similar to Big Ben has an hour hand 2.70 m long with a mass of 62.0 kg, and a minute hand 4.80 m long with a mass of 100 kg. Calculate the total rotational kinetic energy of the two hands about the axis of rotation. (You may model

    asked on April 16, 2011
  100. intro to computers

    what overriding philosophy of the windows 8operating system makes it unique compared to earlier Microsoft operating systems? is a universal operating system for all types of devices? can host both 32-and 64- bit applications c.up to 192 users can

    asked on October 30, 2013


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