Most popular questions and responses by Andrew
  1. math

    Find two numbers the exact answer is between. 3 X 567

    asked on October 5, 2011
  2. social studies

    Which of the following Native American cultures built connected stone homes? 1. A. the Mississippians B. the Ancestral Puebloans--------- C. the Cherokees D. the Hoyanehs 2. Drag and drop the descriptions to the correct box. Each word may be used more than

    asked on August 28, 2018
  3. Math

    The number of blocks has nine in the ones place the numbers in the hundreds place is one more than the number in the tens place there are two numbers equal 11 how many block are there

    asked on April 28, 2016
  4. Chemistry

    Calculate the pH at the halfway point and at the equivalence point for each of the following titrations. (a) 100.0 mL of 0.14 M HC7H5O2 (Ka= 6.4 multiplied by 10-5) titrated by 0.14 M NaOH halfway point equivalence point (b) 100.0 mL of 0.29 M C2H5NH2 (Kb

    asked on June 1, 2012
  5. Chemistry

    A galvanic cell is based on the following half-reactions at 25C: Ag+ + e- --> Ag H2O2 + 2H+ + 2e- ---> 2H2O (not H2O2) Predict whether E_cell is larger or smaller than E°_cell for the following case. [Ag+]= 1.0M, [H2O2]= 2.0 M, [H+]=2.0M

    asked on March 30, 2009
  6. Language Arts

    1. How do both employers first cheat their governess? The employers say they mad a note of the fact that the pay is 30 rubbles a month and not 40 The employers indicate that an agreement was made about losing pay for holidays The employers decide to deduct

    asked on April 23, 2015
  7. Science

    1. A weatherman reports, "the storm waves are about 2 meters high and about 35 meters apart. "what properties of waves is the reporter describing? Frequency and wavelength Wavelength and wave speed***** Amplitude and wavelength Amplitude and frequency 2.

    asked on April 16, 2015
  8. Chemistry

    A gas mixture consists of equal masses of methane (molecular weight 16.0) and argon (atomic weight 40.0). If the partial pressure of argon is 200. torr, what is the pressure of methane, in torr?

    asked on January 22, 2017
  9. Algebra

    The first group was responsible for making 160 suits while the second group was responsible for making 25% fewer suits in the same amount of time. The first team made 10 more suits each day than the second team and finished its job 2 days before the

    asked on March 22, 2016
  10. Chemistry

    BrO3- + 5Br- + 6H+ 3Br2 + 3H2O If 25.0 ml of 0.200-molar BrO3- is mixed with 30.0 ml of 0.45-molar Br- solution that contains a large excess of H+, what is the amount of Br2 formed, according to the above equation? The answer is 0.00810 moles but I don't

    asked on December 16, 2008
  11. Geometry

    Jason wants to walk the shortest distance to get from the parking lot to the beach. a.How far is the spot on the beach from the parking lot? b. How far will he have to walk from the parking lot to get to the refreshment stand?

    asked on February 1, 2014
  12. Temperature(Math)

    At 5 o'clock in the morning, the temperature at the top of the race course was -13o. By 10:00 A.M., it was +12o. How much had the temperature risen? Answer: 25o The temperature rose from -12o to +23o by noon. How much did the temperature change? Answer:

    asked on January 26, 2012
  13. physics

    When landing after a spectacular somersault, a 40.0 kg gymnast decelerates by pushing straight down on the mat. Calculate the force she must exert if her deceleration is 5.00 times the acceleration of gravity.

    asked on October 3, 2015
  14. Algebra

    An automobile covered the distance of 240 km between A and B with a certain speed. On its way back, the automobile covered half of the distance at the same speed and for the rest of the trip he increased his speed by 10 km/hour. As a result, the drive back

    asked on March 22, 2016
  15. Physics

    A 1140 kg car traveling south at 24 m/s with respect to the ground collides with and attaches to a 2550 kg delivery truck traveling east at 16 m/s.

    asked on February 13, 2017
  16. chemistry (electrochemistry)

    1) For the following electrochemical cell Cu(s)|Cu2 (aq, 0.0155 M)||Ag (aq, 1.50 M)|Ag(s) write the net cell equation. Calculate the following values using standard potentials as needed. Eo cell and dGo for each

    asked on April 15, 2013
  17. Chemistry

    For the reaction below, Kp = 1.16 at 800.°C. CaCO3(s) CaO(s) + CO2(g) If a 25.0-g sample of CaCO3 is put into a 10.2-L container and heated to 800.°C, what percent of the CaCO3 will react to reach equilibrium?

    asked on May 12, 2012
  18. math

    1. determine which order pair is a solution of y = -5x + 10 A. (-15,5) **** B. (2,0) C. ( -1 , -5 ) D. (3, 25 ) 2.on which of the following lines does the point ( 7,1 ) lie? A. y-5x = 4 B. y=x -10 C. y = -4x +3 *** D. y + -x +8 3.find the slope of the line

    asked on December 1, 2016
  19. Physics

    1) Charges of +4uC and -6uC are placed at two corners of an equilateral triangle with sides of 0.10m. At the third corner, what is the electric field magnitude created by these two charges? A]4.5 x 10e6 N/C B]3.1 x 10e6 N/C C]1.6 x 10e6 D]4.8 x 10e6 2)A

    asked on February 3, 2011
  20. Physics

    A force F = 119 N acts at an angle α = 31◦ with respect to the horizontal on a block of mass m = 22.5 kg, which is at rest on a horizontal plane. The acceleration of gravity is 9.81 m/s 2 . If the static frictional coefficient is µs = 0.72, what is the

    asked on January 11, 2016
  21. Chemistry

    Consider the following reaction: 2NOCl(g) 2NO(g) + Cl2(g) Initially pure NOCl(g) is placed in a vessel at 3.00 atm. At equilibrium, 0.416% of the NOCl has decomposed. Determine the value for Kp.

    asked on May 13, 2012
  22. Physics

    Your grandfather clock’s pendulum has a length of 0.9930 m. If the clock loses 95.6 seconds per day, by how many millimeters should you adjust the length of the pendulum?

    asked on March 10, 2013
  23. Chemistry

    Calculate the heat given off when 177 g of copper cools from 155.0 c to 22.0 c. The specific heat capacity of copper is 0.385 j/g c

    asked on January 23, 2014
  24. physical scince

    Imagine two billiard balls on a pool table. Ball A has a mass of 7 kilograms and ball B has a mass of 2 kilograms. The initial velocity of the ball A is 6 meters per second to the right, and the initial velocity of the ball B is 12 meters per second to the

    asked on January 26, 2018
  25. english 1

    Which sentence from the passage best supports the conclusion that the author was influenced by Amaterasu?

    asked on January 21, 2016
  26. Chemistry

    What volume of 3.0M Na2SO4 must be added to 25ml of 1.0M BaCl2 to produce 5.0g of BaSO4? The answer is 7.1ml but I don't get it very well. I thought I could use mole ratio of the balanced equation, but it did not work. Thanks a lot!

    asked on September 19, 2008
  27. chemistry

    A current of 3.78 A is passed through a Pb(NO3)2 solution for 1.40 hours. How much lead is plated out of the solution?

    asked on April 15, 2013
  28. physics

    A 0.500 ice puck, moving east with a speed of 6.70 , has a head-on collision with a 0.700 puck initially at rest. Assuming a perfectly elastic collision, what will be the speed of the 0.500 object after the collision? What will be the speed of the 0.700

    asked on February 2, 2012
  29. Chemistry

    In the combustion of natural gas according to the equation CH4 + 2 O2 -> CO2 +2 H20, how many grams of water are formed during the combustion of 0.264 mole of CH4?

    asked on October 26, 2014
  30. Science

    The flask shown here contains 10.0 ml of HCl and a few drops of phenolphthalein indicator. The buret contains 30ml of 0.130M NaOH. What Volume of NaOH is needed to reach the end point of the titration? I've used m1v1=m2v2, (x)(10.0ml HCl) = (0.130 M/L

    asked on September 28, 2014
  31. chem 101

    using the unit conversion method derive an equation to calculate heat produced from the HCl-Na OH reaction

    asked on October 26, 2010
  32. College Physics II (Calc-Based)

    In state-of-the-art vacuum systems, pressures as low as 1.00 x 10^-9 Pa are being attained. Calculate the number of molecules in a 1.90-m^3 vessel at this pressure and a temperature of 35.0°C. Okay. So I know I have to use the Ideal Gas Law, PV = nRT, I

    asked on August 29, 2013
  33. Physics

    A convex lens forms a real image 6 times the size of the object. The distance between object and image is 33 cm. Find the focal length of the lens.

    asked on May 28, 2012
  34. Physics

    Two ice skaters, Daniel (mass 70.0kg ) and Rebecca (mass 45.0kg ), are practicing. Daniel stops to tie his shoelace and, while at rest, is struck by Rebecca, who is moving at 14.0m/s before she collides with him. After the collision, Rebecca has a velocity

    asked on October 17, 2013
  35. chemistry

    Assume that the entire mass of an atom is concentrated in its nucleus, a sphere of a radius 1.5 x 10 to the -5 pm. If the mass of the atom is 2.39 x 10 to the -22 g, what is the density?

    asked on September 29, 2008
  36. Allied Health

    Under HIPAA, which one of the following statements is true regarding the release of PHI by covered entities to business associates? A. Covered entities are responsible for the use of PHI made by business associates. B. Covered entities aren’t allowed to

    asked on April 20, 2009
  37. Chemistry

    Before small batteries were available, carbide lamps were used for bicycle lights. Acetylene gas, C2H2, and solid calcium hydroxide were formed by the reaction of calcium carbide, CaC2, with water. The ignition of the acetylene gas provided the light.

    asked on November 22, 2016
  38. Chemistry

    What is the concentration of Hg^2+ in 500.0 mL of a solution that was originally 0.011 M Hg^2+ and had 73 g of KI added to it? Hg^2+(aq) + 4I^-(aq) HgI4^2-(aq) The overall formation constant is 1x10^30

    asked on June 4, 2012
  39. chemistry

    HBr is a molecular substance that is a strong acid in water. Write an equation for its ionization in water. Use minimal integer numbers to balance the reaction. Include physical states in your answer, e.g., start with HBr(l).

    asked on October 4, 2010
  40. math

    Beth Dahlke is taking a ten question multiple choice test for which each question has three answer choice only one of which is correct. Beth decides on answers by rolling a fair die and making the first answer choice if the die shows 1 or 2 the second if

    asked on November 20, 2012
  41. STAT

    You will need a binomial table for n = 20 for this problem. Suppose that a quiz consists of 20 True-False questions. A student hasn't studied for the exam and will just randomly guesses at all answers (with True and False equally likely). What is the

    asked on June 25, 2019
  42. physics

    An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm2, separated by a distance of 1.70 mm. If a 19.2-V potential difference is applied to these plates, calculate the following: (a) the electric field between the plates,

    asked on May 18, 2012
  43. Volume of a rectangular prism

    Hello, if the volume of a rectangular prism is LWH = 64 cubic inches, what are the dimensions of a rectangular prism with dimensions twice as long? Thank you!

    asked on March 1, 2010
  44. Physics 11

    In physics we did a lab experiment that involved finding the Heat capacity. the teacher told us that we wont get an exact answer. He wanted us to state the Source of Error. what is a source of Error? He said that it isn't a "human stupidity error" eg.

    asked on November 10, 2009
  45. physics

    Two loudspeakers are placed above and below each other and driven by the same source at a frequency of 3.70 102 Hz.An observer is in front of the speakers at point O, at the same distance from each speaker. What minimum vertical distance upward should the

    asked on May 3, 2012
  46. Math

    1 rabbit saw 6 elephants while going to the river. Every elephant saw 2 monkeys going towards the river. Every monkey holds 1 parrot in their hands. How many animals are going towards the river?

    asked on December 27, 2017
  47. Algebra

    A ship traveled 150 km with the current, and then turned around and traveled back, spending 5h and 30 min on its trip. Find the speed of the current if the speed of the ship in still water is 55 km/hour.

    asked on March 22, 2016
  48. English

    I have a problem with 'diction' I kind of 'feel' the sentence, but I don't know what to write. Thanks a lot!! "Art is the antidote that can call us back from the edge of numbness, restoring the ability to feel for another." By using the word "antidote",

    asked on September 9, 2008
  49. Calculus

    an open box is made by cutting out squares from the corners of a rectangular piece of cardboard and then turning up the sides. If the piece of cardboard is 12 cm by 24 cm, what are the dimensions of the box that has the largest volume made in this way?

    asked on July 18, 2011
  50. Science

    Any help is appreciated! An ecosystem contains the following food chain: Phytoplankton --> shrimp --> copepods --> sunfish --> shark Which of the following describes a likely change in this ecosystem if the shrimp population was depleted by fishing? A. The

    asked on October 25, 2018
  51. Chemistry

    A sample of carbon monoxide was collected over water at a total pressure of 752 torr and a temperature of 15°C. What is the pressure (in torr) of the carbon monoxide?

    asked on November 21, 2016
  52. math

    One day, the temperature outside increased by 6/10 every hour for seven hours. How much did the temperature increase that day?

    asked on March 24, 2014
  53. Chemistry

    Little confusing!! I need help PLZ!!! Two half cells in a galvanic cell consist of one iron (Fe(s)) electrode in a solution of iron (II) sulphate (FeSO4(aq)) and a silver (Ag(s)) electrode in a silver nitrate solution. a. Assume the cell is operating as a

    asked on June 17, 2011
  54. physics

    A wire of initial length L0 and radius r0 has a measured resistance of 2.5 . The wire is drawn under tensile stress to a new uniform radius of r = 0.45r0. What is the new resistance of the wire?

    asked on May 21, 2012
  55. chemistry

    The average human body has 1.4x10^2 g of total K within it. Calculate the activity in disintegration/year of the potassium-40 in the average human body using your value of t1/2 (or K) of this substance

    asked on August 22, 2012
  56. Economics

    Consider an economy with the following aggregate demand(AD) and aggregate supply(AS) schedules. These schedules reflect the fact that, prior to the period we're examining, decisions makers entered into contracts and made choices anticipating that the price

    asked on February 22, 2012
  57. Economics

    In a perfect competitive market setting,which of the following would be a true statement? a)market price automatically sets itself exactly at equilibrium b)market price rarely trends toward the equilibrium value c)wage rates trend toward marginal revenue

    asked on February 24, 2015

    design a program for the following. Registration workers at a conference for authors of children's book have collected data about conference participants, including the number of book each author has written and the target age of their readers. The

    asked on April 8, 2014
  59. math

    An art teacher has 1 1/2 pounds of red clay and 3/4 pound of yellow clay. The teacher mixes the red clay and yellow clay together. Each student in the class needs 1/8 pound of the clay mixture to finish the assigned art project for the class. How many

    asked on November 18, 2014
  60. physics

    An object is placed 75.0 cm from a screen. (a)Where should a converging lens of focal length 8.0 cm be placed to form an image on the screen? shorter distance __cm from the screen farther distance __cm from the screen (b)Find the magnification of the lens.

    asked on May 23, 2012
  61. Algebra

    A farmer has 20 acres to plant in wheat and barley. He has to plant at least 15 acres. Wheat costs $200 per acre to plant and barley costs $150 per acre, and the farmer has only $2400 to spend. If the estimated profit of an acre of wheat is $450 and the

    asked on March 24, 2016
  62. Math

    If you toss a pair of dice 1,000 times, how many times would you expect to get a sum of 12 as the result? 1.)about 12 times 2.)about 27 times 3.)about 36 times 4.)about 100 times The lesson doesn't show me how to work this. Whats the formula?

    asked on January 7, 2011
  63. Chem

    Sodium thiosulfate, Na2S2O3, is an important reagent for titrations. Its solutions can be standardized by titrating the iodine released when a weighed amount of potassium hydrogen iodate, KH(IO3)2 (389.912 g/mol), is allowed to react with excess potassium

    asked on October 23, 2017
  64. Algebra

    Is the series 72, 48, 32,... an arithmetic or geometric series. WHat is common difference or ratio

    asked on January 17, 2013
  65. Mathematics

    Juice is sold in a rectangular prism measuring 11 cm by 6 cm by 4 cm. A cube is built to hold the same volume. By how much does the surface area decrease? Give answer to 1 decimal place.

    asked on April 19, 2017
  66. Science

    Which of the following is an example of an inherited trait? A. Migration in geese B. Hunting behavior of tigers C. A child riding a horse D. A dolphin jumping through a hoop A? An orangutan is trying to catch a fish with a long pointed tool. Which of the

    asked on February 1, 2012
  67. chemistry

    How much heat, in kilojoules, is evolved when a 3.70 kg sample of molten Cu freezes? The normal boiling point is 1357 K, and heat of fusion is 13.05 KJ/mol. 2.) How much heat must be absorbed at 1357 K to melt a bar of copper (80 * 10 * 12 cm) assume d =

    asked on February 15, 2010
  68. Physics

    A 65.0 kg skier with an initial speed of 11.0 m/s coasts up a 2.50 m high rise as shown in Figure 6.23. Find his final speed at the top, given that the coefficient of friction between her skis and the snow is 0.0800.

    asked on February 22, 2015
  69. Chemistry

    How many milliliters of water at 25.0°C with a density of 0.997 g/mL must be mixed with 165 mL of coffee at 91.0°C so that the resulting combination will have a temperature of 62.1°C? Assume that coffee and water have the same density and the same

    asked on November 15, 2016
  70. Math

    Are the following sets closed? Explain why / why not? a) The set {1, 2, 3, 4, 5} under addition? b) The set {-1, 0, 1} under addition? c) The integers under addition? d) The set of positive integers under subtraction? e) The set of natural numbers under

    asked on August 10, 2019
  71. math

    Karen and Wayne need to buy a refrigerator because theirs just broke. Unfortunately, their savings account is depleted, and they will need to borrow money in order to buy a new one. Sears offers them an installment loan at 15% (add-on rate). If the

    asked on March 17, 2013
  72. Physics 2

    A 1.00-L insulated bottle is full of tea at 88.0°C. You pour out a mug of tea and immediately screw the stopper back on the bottle. Find the change in temperature of the tea remaining in the bottle that results from the admission of air at room

    asked on September 17, 2013
  73. Chemistry

    Problem Description: You are a workstudy for the chemistry department. Your supervisor has just asked you to prepare 500mL of 3M HCl for tomorrow's undergraduate experiment. In the stockroom explorer, you will find a cabinet called "Stock Solutions". Open

    asked on August 13, 2019
  74. Algebra

    Bakery has bought 250 pounds of muffin dough. They want to make waffles or muffins in half-dozen packs out of it. Half a dozen of muffins requires 1 lb of dough and a pack of waffles uses 3/4 lb of dough. It take bakers 6 minutes to make a half-dozen of

    asked on March 24, 2016
  75. Algebra

    identify the initial amount a and the growth factor b in the exponential function g(x)=14*2^x a=14, b=x a=14, b=2 a=28, b=1 a=28, b=x

    asked on February 29, 2016
  76. College Physics

    A wire P has resistance R. If the wire is stretched and its length is increased by 10%, what would be the percentage change in its resistance? (Assume the density of the wire remains constant) A) - 10% B) 0 % C) 10% D) 20% My thoughts: Since resistance is

    asked on November 24, 2011
  77. physics

    A stationary pool ball with mass 0.20 kg is struck with an average force of 35 N over a time of 18 ms. What speed does it have just after impact?

    asked on May 27, 2015
  78. physics

    Calculate the magnitude and direction of the Coulomb force on each of the three charges connected in series: 1st - 6 micro Coulombs (positive charge) 2nd - 1.5 micro Coulombs (positive charge) 3dr - 2 micro Coulombs (negative charge) Distance between 1st

    asked on May 21, 2012
  79. history essay please help!

    How does the growth of the world's population today compare with its growth 100 years ago? Explain why the changes have taken place. My essay: Today's world population growth compared to the population growth 100 years ago is a big, big difference. The

    asked on November 14, 2014
  80. math

    The scale on amount is 2 inches equals 75 feet. On the map a rectangle or park is 8 inches long and 3 inches wide. What is the actual area of the park? Please answer I am confused.

    asked on July 19, 2017
  81. Math

    A faucet is leaking at a rate of 4.2 milliliter per minute. How many gallons of water does the faucet leak per day? Use 1 L = 0.26 gal. Explain how you solved this problem

    asked on October 26, 2017
  82. math

    Jacie is considering a job that offers a monthly starting salary of $3000 and guarantees her a monthly raise of $180 during her first year on the job. Find the general term of this arithmetic sequence and her monthly salary at the end of her first year/

    asked on November 9, 2011
  83. Math

    Two 2 1/2 inch plastic strips and two 5 1/3 inch plastic strips are used to form a rectangle. What is the Perimeter of the rectangle?

    asked on October 18, 2016
  84. physics

    An elevator and its load have a combined mass of 1700 kg. Find the tension in the supporting cable when the elevator, originally moving downward at 13 m/s, is brought to rest with constant acceleration in a distance of 43 m.

    asked on October 7, 2010
  85. chemistry ugg!

    what is the age of a rock whose Argon 40 / Potassium 40 ratio is 1.55? The half life of Potassium 40 is 1.28 x 10^9 years I am confused on this question theres no examples in my book but i have to know it can someone explain to me how to get to the answer?

    asked on June 15, 2006
  86. Calculus

    Glenview Community College wants to build a rectangular parking lot on land bordered on one side by a highway. It has 380 feet of fencing to use on the other three sides. What should be the dimensions of the lot if the enclosed area is to be a maximum?

    asked on March 8, 2012
  87. chemistry

    How much heat, in kilojoules, is evolved when a 3.70 kg sample of molten Cu freezes? The normal boiling point is 1357 K, and heat of fusion is 13.05 KJ/mol. 2.) How much heat must be absorbed at 1357 K to melt a bar of copper (80 * 10 * 12 cm) assume d =

    asked on February 15, 2010
  88. help math

    In triangle ABC, points D,E,F are on sides BC,CA,AB respectively such that AD,BE,CF are angle bisectors of triangle ABC. The linesAD,BE,CF are concurrent at I,the incenter of triangle ABC. If Angle BAC=90, what is the measure (in degrees) of Angle EIF?

    asked on May 28, 2013
  89. language arts

    1. which of the following sentence contains a linking verb ? A. Teresa wore her fav shoes today. b. her shoes look really comfortable c. she put them on with striped socks d. Teresa walked for hours without a complaint ! I'm not sure whts the answer , I

    asked on December 4, 2016
  90. chem 101

    how many grams of oxalic acid dihydrate to completely neutralize 25ml of 0.12 M of sodium hydroxide

    asked on October 18, 2010
  91. chemistry

    which of the following would form acidic,basic or neutral solutions:nh4f,nh4cn,nh4ch3coo,nh4cl,ba(ch3coo)2,nacn,caso4,cr(no3)3,fecl3,na2co3

    asked on November 11, 2010
  92. US History

    Question 1 (Multiple Choice Worth 1 points) Around the turn of the century, African Americans moving to cities in the North experienced substantially less racism than did African Americans in the South. more opportunities to become skilled workers than

    asked on March 23, 2011
  93. Chemistry

    Calcium oxide, or lime, is produced by the thermal decomposition of limestone in the reaction CaCO3(s) arrow CaO(s) + CO2(g). What mass of lime can be produced from 2001.2 kg of limestone?

    asked on October 31, 2016
  94. math

    use a arrow notation to write a rule for this translation (2,1) (5,3) (-1,4) ?

    asked on December 6, 2016
  95. Geometry

    in rectangle efgh shown below with diagonal hf drawn which is the closest to the measure of ef

    asked on June 2, 2019
  96. Programming

    Write a program that inputs (from the user) the number of hours worked and hourly rate for employees and outputs the total pay. The program should process an arbitrary number of employees; the user will terminate input by entering 0 hours worked and pay

    asked on November 1, 2015
  97. Math

    Plz Help!!! List three different ways to write 5 (with an exponents of 11) as the product of two powers. explain why all three of you expressions are equal to 5 with an exponent of 11… so far i just know that when your dealing with multiplying a power

    asked on May 25, 2015
  98. Social Studies

    How did wheat help the U.S. gain wealth and power in the world?

    asked on April 30, 2009
  99. English

    A question on "The Lottery" by Shirley Jackson ? I am writing an essay explaining how the use of literary devices creates a sense of horror. I wrote down things like "withheld knowledge" (that the author not telling readers the "prize" of the lottery) but

    asked on October 12, 2008
  100. Math

    How many 1 1/4 foot pieces can you cut from a piece of wood that is 20 ft long

    asked on September 10, 2017


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