Most popular questions and responses by Juan
  1. Chemistry

    Which of the following represent conjugate acid-base pairs? For those pairs that are not conjugates, write the correct conjugate acid or base for each species in the pair. a. HS-4-,SO4^2- B. HBr, BrO- c. H2PO4-, PO4^3- d. HNO3, NO2-

    asked on March 10, 2013
  2. algebra

    A pharmacist has 40% and 60% iodine solutions on hand. How many liters of each iodine solution will be required to produce 4 liters of a 50% iodine.

    asked on January 21, 2013
  3. Math

    Two squares are drawn. The larger square has area of 400 square inches. The areas of the two squares have a ratio of 1 : 4. What is the side length s of the smaller square?

    asked on September 15, 2017
  4. Math

    A community needs to raise at least $5000 to build a new skateboarding park. They are selling backpacks for $25 each to raise the money. Write and solve an inequality to determine the minimum number of backpacks they need to sell in order to reach this

    asked on March 8, 2016
  5. chemistry

    What is the percentage by mass of sodium (Na) in a formula unit of sodium hydrogen carbonate (NaHCO3)?

    asked on January 11, 2016
  6. math

    A cylinder has a surface area of 339 square centimeters and a radius of 6 centimeters. Estimate the volume of the cylinder to the nearest whole number

    asked on April 10, 2018
  7. Intro to computers

    Which type of updates should be installed in a test environment before being installed in a live enterprise environment.? A. Updates for Wkndows XP B. Recommend Updates C. Service Packs D. Security updates

    asked on May 12, 2014
  8. chem 223

    What additional volume of 10.0 M HCl would be needed to exhaust the remaining capacity of the buffer after the reaction described in Part B?

    asked on July 22, 2013
  9. Math

    The volume of a cylinder is 24pi cubic feet. What is the volume of a cone having same base and same height?

    asked on April 11, 2018
  10. math

    Your school is organizing a carnival. You are building a ramp for a game. The ramp will be 8 feet long with a total rise of 5 feet. Find the angle of elevation of the ramp.

    asked on February 10, 2016
  11. physics

    In compressed state, a spring 3.00 meters long hanging from the ceiling has a potential energy of 2.0 joules. If the entire potential energy is used to release a ball of mass 1.2 kilograms vertically downward, then what is the kinetic energy of the ball

    asked on December 17, 2014
  12. Statistics

    Carrie attained a score of 650 on the verbal section of her SAT. The mean grade was a 500 with a standard deviation of 100. What percentage of test takers scored below and above Carrie?

    asked on October 30, 2014
  13. Calculus study

    A baseball team plays in a stadium that holds 52000 spectators. With the ticket price at $9 the average attendance has been 21000. When the price dropped to $6, the average attendance rose to 26000. a) Find the demand function p(x), where x is the number

    asked on March 30, 2015
  14. Geometry

    a regular triangular pyramid has all of edges of length 36. What is the angle between any two faces of this pyramid.

    asked on January 29, 2017
  15. Math

    . Lopez has $9118 in her bank account on March 1st. She saves $609 in March. Then she must pay $1011 in taxes in April. Mrs. Lopez is able to save $705 in May. At the end of May, approximately how much greater or less is her account balance than it was on

    asked on September 17, 2015
  16. Gen Chemistry

    Determine the concentrations of MgCl2 Mg2+ and Cl- in a solution prepared by dissolving 2.73*10^-4g MgCl2 in 1.00L of water. Express all the concentrations in molarity. Additionally, express the concentrations of the ionic species in ppm. MgCl2= ____ M

    asked on October 31, 2018
  17. physics

    A car weighing 9800 N travels at 30 m/s. What braking force (to the nearest whole number) brings it to rest in 100 m???? THNX BOBPURSLeY

    asked on November 9, 2009
  18. Math

    A sales associate at a computer store receives a bonus of $100 for every computer he sells. He wants to make $2500 in bonuses next month. Write and solve an inequality to find the minimum number of computers he must sell.

    asked on March 8, 2016
  19. Math

    The surface area of the Sun is about 4x3.141x(7x10^5)^2 square kilometers. Simplify the expression

    asked on October 24, 2017
  20. Math

    Dan deposited $4000 into an account with 4.8% interest, compounded monthly. Assuming that no withdrawals are made, how much will he have in the account after 9 years? I was just wondering of the formula for this problem, because I am not able to find it in

    asked on August 11, 2016
  21. math

    After Karen spent 1 4 of her paycheck on a coat, she had $96 left. What was the cost of her coat?

    asked on January 14, 2019
  22. Physics

    two objects attract each other gravitationally with a force of (2.5)(10^-10)N when they are 0.25m apart. Their total mass is 4.0 kg. Find their individual masses.

    asked on February 14, 2014
  23. physics

    A half-cup of ice cream contains about 200 food Calories. How much power can be produced if the energy in a cup of ice cream is expended over a period of 10 minutes (600 seconds)? Each food Calorie is equal to 4,184 joules. Write your answer in watts and

    asked on December 7, 2016
  24. algebra

    A pharmacist has 40% and 60% iodine solutions on hand. How many liters of each iodine solution will be required to produce 4 liters of a 50% iodine. 1. iodine1 = 2, iodine2=2 2. iodine1 = 21, iodine2 = 21 3. iodine1 = 41, iodine2 = 41 4. iodine1 = 41,

    asked on January 21, 2013
  25. Physics

    A 0.60-kg block initially at rest on a frictionless, horizontal surface is acted upon by a force of 9.0 N for a distance of 2.0 m. How much farther would the force have to act for the block to have 72 J of kinetic energy?

    asked on September 20, 2017
  26. Math

    Nico is saving money for his college education. He invests some money at 9​%, and ​$1100 less than that amount at 6%. The investments produced a total of ​$249 interest in 1 yr. How much did he invest at each​ rate?

    asked on September 27, 2017
  27. chemistry

    What volume of H2 (g) (at 750. mm Hg and 25 C) is produced from 50.0 mL of 0.214 M H2SO4 and 0.300 g of Al?

    asked on November 29, 2011
  28. Microeconomics

    taxes may cause deadweight losses because________. a. they transfer purchasing power from buyers to the government. b. they lower the surplus in the market. c. they increase consumer surplus at the expense of producer surplus d. they transfer purchasing

    asked on June 24, 2015
  29. calculus

    A ball is thrown from an initial height of 130 feet with an initial upward velocity of 35ft/s . The ball's height H (in feet) after T seconds is given by the following h=130-6t-16t^2

    asked on April 6, 2015
  30. Chemistry

    At the equivalence point in a titration you know the volume (x mL) of a standard solution of acid (2.5 M) that has been added to a known volume base (y mL). show how you can determine the concentration of the base.? Explain

    asked on March 15, 2013
  31. Microeconomics

    suppose Belgium produces only two goods, chocolate and lace. If Belgium has a comparative advantage in lace, a move toward free trade will a. benefit chocolate workers, harm lace workers in the short run, but benefit the nation as a whole. b. harm

    asked on July 1, 2015
  32. Math

    Points J and K, plotted on the coordinate grid, are two vertices of rectangle JKLM. Rectangle JKLM has an area of 7 square units. Point J is located at (2, 1) and point K is located at (-5, 1). Each vertex of the rectangle is located at a point that has

    asked on April 11, 2016
  33. Chemistry

    we burn 12.50L of ammonia in 20.00L of oxygen at 500 degrees celsius. What volume of nitric oxide, NO, gas can form? what volume of steam, H2O (g) is formed? Assume that all gases are at the same temperature and pressure, and that the limiting reactant is

    asked on May 6, 2013
  34. Chemistry

    use the bronsted-lowry model to label the acid-base pairs in the following equation for the ionization of water: H20(L) + H20(L) H30+(AQ) + OH-(AQ). EXAPLAIN

    asked on March 10, 2013
  35. math

    Paul has two thirds as many postcards and shawn the number of postcards shawn has three fifths of a number of postcard tim has if three boys have 280 postcards altogether how many more postcards does Tim have than Paul

    asked on November 11, 2014
  36. ecuaciones diferenciales


    asked on August 18, 2016
  37. physics

    a body is thrown downward with an initial speed of 20.0 m/s on earth. what is the acceleration of the object

    asked on November 2, 2010

    Wanda is pushing a stroller and starts from rest, uniformly accelerating at a rate of 0.500 m/s2. What is the velocity of the stroller after it has traveled 4.75m?

    asked on October 20, 2017
  39. english 9

    Which values of the ancient Greeks are most emphasized in this excerpt?

    asked on September 15, 2016
  40. Trigonometry

    two sightings of the top of a flagpole are taken 75 meters apart on level ground. The two sightings are 21° and 32°. What is the height of the flagpole?

    asked on May 16, 2016
  41. math

    Max and Jack bought a large pizza to share.Max ate 5/8 of the pizza.What fraction of the pizza was left for Jack.

    asked on October 8, 2015
  42. chemistry

    How many grams of hydrogen are released by the reaction of 1.00 g of aluminum with excess potassium hydroxide solution assuming 100% yield

    asked on March 12, 2015
  43. Math

    What are the steps to getting the tan of 345degree, without the use of a calculator?

    asked on June 3, 2011
  44. math

    Jackson is creating a water garden surrounded by a triangular patch of grass. If the pond will take up the space indicated by the circle, how many square feet of sod will he need to complete the garden (use 3.14 for and round your answer up to the next

    asked on February 7, 2012
  45. Math

    A certain clock gains 3 minutes every hour if this clock shows the correct time at 6:00 an what time will the clock show when it is 1:00 pm of the same day?

    asked on January 16, 2016
  46. Microeconomics

    suppose Belgium produces only two goods, chocolate and lace. If Belgium has a comparative advantage in lace, a move toward free trade will a. benefit chocolate workers, harm lace workers in the short run, but benefit the nation as a whole. b. harm

    asked on May 20, 2015
  47. physics

    What is the angular momentum of a 0.200- ball rotating on the end of a thin string in a circle of radius 1.45 at an angular speed of 13.0 ?

    asked on May 6, 2012
  48. physics

    A person travels by car from one city to another with different constant speeds between pair of cities. She drives for 38.6 min at 87.2 km/h, 10.3 min at 107.9 km/h, and 45.6 min at 45.7 km/h, and spends 17.9 min eating lunch and buying gas. Find the

    asked on October 4, 2009
  49. Macroeconomic

    An increase in the capital stock will: A. Shift production function downward. B. Shift the production function upward C. Flatten the production function D. Steepen the production function The answer is B?

    asked on May 30, 2014
  50. Math

    The systolic blood pressures of the patients at a hospital are normally distributed with a mean of 136 mm Hg and a standard deviation of 13.4 mm Hg. Find the two blood pressures having these properties: the mean is midway between them and 90% of all blood

    asked on October 11, 2009
  51. Alg I

    Margot and Francois were doing their algebra homework when Margot's dog, Pepe, bit off a piece of the paper they were working on. All they had left was a part of the sequence: 6, 12, ... and the fact that 1536 was another term of the sequence. Assuming the

    asked on February 27, 2018
  52. Macroeconomic

    Suppose that a market for a product is in equilibrium at a price of $5 per unit. At any price above $5 per unit. A. There will be an excess demand for the product. B. There will be an excess supply of the product. C. The quantity supplied of the product

    asked on May 29, 2014
  53. ASU

    Oppositely charged parallel plates are separated by 5.35 mm. A potential difference of 600 V exists between the plates. (a) What is the magnitude of the electric field between the plates? (b) What is the magnitude of the force on an electron between the

    asked on February 7, 2014
  54. statistics

    for randomly selected adults, IQ scores are normally distributed with a standard deviation of 15. the scores of 14 randomly selected college students are listed below. use a 0.10 significance level to test the claim that the standard deviation of IQ scores

    asked on April 29, 2019
  55. Jefferson

    lisa is 6 years older than Tom. Their father's age is twice the sum of their ages. How old is lisa if her dad is 32?

    asked on December 2, 2015
  56. Macroeconomic

    All of the following statements are true of the Federal Reserve EXCEPT: A. Acts as the central bank for all countries in the world. B. Along with the Board of Governors, the chairperson of the Federal Reserve determines monetary policies and strategies

    asked on May 27, 2014
  57. chemistry

    A reaction mixture is in a 5.4 L flask at 25 oC initially contains only 7.64 grams of acetic acid. (CH3COOH). Set up your I.C.E. table and use it to answer the following questions. HINT: You will need to look up the Ka for this equilibrium reaction.

    asked on March 1, 2011
  58. MAth

    Make a tally chart for the numbers of students in the third-,fourth-,and fifth-grade classes:26,25,27,27,26,28,27.

    asked on October 12, 2010
  59. Algebra

    Shelly made 5 more sales calls than Clark . Shelly and Clark made a total of 33 sales calls. How many sales calls did each make .

    asked on June 12, 2014
  60. Physics

    A student places her 442 g physics book on a frictionless table. She pushes the book against a spring, compressing the spring by 4.44 cm, then releases the book. What is the book's speed as it slides away? The spring constant is 1102 N/m.

    asked on September 29, 2011
  61. MGT 330

    A worker in an automobile assembly line who chooses this type of work because of the job security it entails is said to be

    asked on May 1, 2011
  62. Physics

    Find the tension in the rope of an Atwood machine that has a 40 kg mass hanging on one side and a 60 kg mass on the other.

    asked on March 12, 2018
  63. Math

    destiny has 6 library books on her desk. one third of them are about animals. how many of destiny's library books are about animal?

    asked on March 5, 2018
  64. physics

    A small block of mass 2.7 kg is released from rest at the top of the curved frictionless ramp shown. The block slides down the ramp and is moving with a speed of 13.9 m/s when it collides with a larger block (1.5 times the mass). (Use g=10m/s²). If the

    asked on April 1, 2016
  65. Who Am I

    I have 45 in the denominator I am equivalent to 4-9. What fraction am I?

    asked on March 1, 2016
  66. math

    ginger sent 18 text messages yesterday.jerry sent 4 more than twice as many messages as ginger sent. kyle sent 15 fewer messanges than jerry.how many test messges did jerry and kyle send?

    asked on September 23, 2015
  67. Macroeconomic

    Income taxes create a difference between the interest rate paid by companies and received by lenders. These taxes___________ saving, investment, and the growth rate of real GDP. A. Do not affect B. Lower C. Encourage, but may not change D. Increase The

    asked on June 10, 2014
  68. Scottsdale c c

    A baseball has a velocity of 44.0 m/s, directed horizontally, as it is released by a pitcher. The ball’s velocity 0.0100 s before it is released is 42.0 m/s, directed 3.00 degrees above the horizontal. Estimate the ball’s instantaneous acceleration

    asked on February 27, 2012
  69. Organic Chemistry

    Hi, I did an extraction experiment. I've got my basic layer, and getting my acidic salt in return. To do this, I am instructed to first "add a small amount of NaCl to help with the product precipitation". Then, again I am instructed to add HCl to "acidify"

    asked on November 3, 2014
  70. mechanics

    An object (point mass) is projected up an inclined plane from the bottom with an initial speed of 5.0 m/s. The plane is 0.75 m high and the coefficient of kinetic friction between the object and the plane is 0.25. For what angle of inclination would the

    asked on February 6, 2012
  71. 8th grade

    two children are fighting over a toy pull on it from opposite sides .the result is stand off.explain this term of the net force

    asked on November 7, 2010
  72. Physics

    (a)Compute the value of G at a point in space that is 7.0X10^6 m from the center of the earth. What will be the value of G at a point with a radius twice that in (a)?

    asked on November 15, 2009

    Suppose a Midwest Telephone and Telegraph (MTT) Company bond, maturing in 1 year, can be purchased today for $975. Assuming that the bond is held until maturity, the investor will receive $1,000 (principal) plus 6 percent interest (that is, 0.06 3 $1,000 5

    asked on December 21, 2008
  74. Philosophy Question

    Who are some famous Mexican philosophers? Check this site for a list of some of Mexico's philosophers. http://en.wikipedia.org/wiki/Category:Mexican_philosophers Ah, most of these guys are white. I want some real latino philosophers, please. What does skin

    asked on June 8, 2007
  75. physics

    In an engine, a piston oscillates with simple harmonic motion so that its position varies according to the expression x = 4.7 cos ( 4t + π/6 ) where x is in centimeters and t is in seconds. Find the period of the motion.

    asked on February 28, 2016
  76. Algebra

    Greg invested his savings in two investment funds. The amount he invested in Fund A was 3 times as much as the amount he invested in Fund B. Fund A returned a 6% profit and Fund B returned a 7% profit. How much did he invest in Fund B, if the total profit

    asked on February 18, 2016
  77. Math

    A single processing machine makes two components, A and B, which are packaged together as the final product (each product sold contains one A and one B). The processor can make only one component at a time. There is a setup time when switching from A to B

    asked on September 8, 2015
  78. Calculus 1

    Related Rates I am having trouble finding the equation to use to fit this all together. At noon, ship A is 100km west of ship B. Ship A is sailing south at 35 km/s and ship B is sailing north at 25 km/s. How fast is the distance between the ships changing

    asked on October 10, 2013
  79. history

    why im optimistic about our nations future can you help me i need to write a essay about this paragraph

    asked on September 21, 2013
  80. math

    0.316 in expanded form

    asked on August 6, 2013
  81. Chemistry

    calculate the volume of 1.07M phosphoric acid solution necessary to react with 22.9 ml of 0.150M Mg(OH)

    asked on May 1, 2013
  82. Chemistry

    Assign oxidation states to all atoms in each of the following. explain the order in which you determine the oxidation states for each element if applicable. a)O2 b)HSO4- c)Na2HPO4 d)CrCl3

    asked on April 21, 2013
  83. Grammar

    God created the heavens and the earth. What are the verbs in this phrase

    asked on May 7, 2010
  84. Physics

    A satillite is orbiting the earth at a distance of 1.00X10^3 km above the surface of the earth. What is it's speed?

    asked on November 15, 2009
  85. Physics

    At what speed must a satellite of a mass M be launched horizontally at the surface of the earth if it's orbit is to be a circle just grazing the highest mountains?( assume no air resistance). How much time would elapse between successive passes of this

    asked on November 15, 2009
  86. Physics

    A car is traveling horizontally at 15.0 mph; raindro ps have a speed of 20.0 mph with respect to the car. A passenger in the car notices the rain is slanted at 30 ° from vertical toward the back of the car. Find the velocity of the rain with respect to

    asked on February 26, 2018
  87. Physics

    A space station is designed so that people can walk on the inside of the outer wall and feel their normal weight. The station is to be 750 m in diameter. What is the period of the station's rotation?

    asked on February 25, 2018
  88. Algebra

    Kerry's car averages 25 mpg. She wants to find how far she can drive based on the gallons in her car. Choose the correct model fo this situation 25=d+g D=25g G=25 ( d is distance in miles and g is gallons of gas) What is the slope ? How far can she travel

    asked on September 19, 2016
  89. math


    asked on July 6, 2016
  90. Finance

    The projected revenues and costs that form the basis of the potential for a project's acceptance or rejection are estimates of ______________. A. Future activity B. Past activity C. Known activity D. Current activity

    asked on April 8, 2014
  91. Calculus 1

    Related Rates I am having trouble finding the equation to use to fit this all together. At noon, ship A is 100km west of ship B. Ship A is sailing south at 35 km/s and ship B is sailing north at 25 km/s. How fast is the distance between the ships changing

    asked on October 10, 2013
  92. Chemistry

    What is 431804 and 10235.0 rounded to four significant figures?

    asked on March 3, 2013
  93. math

    How do you find the rule of the sequence if the 2nd term is 40057.07 and the 5th term is 19192.53

    asked on October 25, 2010
  94. Math

    driver a is going west at 60 mph driver b leaves 3 hours later at a rate of 72 mph how long until driver b catches up to driver A

    asked on October 27, 2016
  95. math

    solution of if 2/7 of the 2905 student and if 30 % of the student play musical instruments, how many student play musical instruments?

    asked on July 6, 2016
  96. English

    Which poetic line contains both paradox and consonance? A. One summer day, all day I drove it hard B. How long it might last, how young it might be C. Ay, look, and he'll smile thy gloom away D. At least to know the worst is I'm leaning towards c. being

    asked on June 8, 2015
  97. Economics

    Why the private market for flu vaccinations would produce an inefficient outcome?

    asked on May 29, 2015
  98. Math

    Dominic collects sports science fiction and history books. He has 21 books about sports, 35 books about science fiction, and 14 about history. He wants the same number of each type of book on each shelf. What is the greatest number of each type of book on

    asked on August 20, 2014
  99. Calculus 1

    Related Rates I am having trouble finding the equation to use to fit this all together. At noon, ship A is 100km west of ship B. Ship A is sailing south at 35 km/s and ship B is sailing north at 25 km/s. How fast is the distance between the ships changing

    asked on October 10, 2013
  100. Calculus 1

    Related Rates I am having trouble finding the equation to use to fit this all together. At noon, ship A is 100km west of ship B. Ship A is sailing south at 35 km/s and ship B is sailing north at 25 km/s. How fast is the distance between the ships changing

    asked on October 10, 2013


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