Popular questions and responses by juan
  1. ecuaciones diferenciales


    asked on August 18, 2016
  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

    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
  4. 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
  5. 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
  6. english 9

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

    asked on September 15, 2016
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. Chemistry

    4, Assign oxidation states for the two elements in the compound OF2. Explain the rules that you use. 5. For each of the following oxidation-reduction reactions of metals and nonmetals, identify the element that is oxidized and the element that is being

    asked on April 21, 2013
  20. Math

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

    asked on June 3, 2011
  21. 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
  22. 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
  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. 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
  25. 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
  26. mathematics

    A patient gets tested for a disease. The test is 90% reliable (that is P(testing positive│have disease)=.9 . 2% of the population has this disease. The test gives a false positive 5% of the time (that is P(testing positive│NOT diseased)=.05). What is

    asked on February 4, 2016
  27. 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
  28. 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
  29. 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
  30. 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
  31. 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
  32. 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
  33. algebra

    what value makes the polynomial factor as a perfect square x+12+?

    asked on February 5, 2014
  34. math

    0.316 in expanded form

    asked on August 6, 2013
  35. kimball

    How many kilojoules of heat must be transferred to a 480-g aluminum pizza pan to raise its temperature from 22 degrees celsius to 234 degrees celsius?

    asked on May 28, 2013
  36. 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
  37. math

    you need 5 foot long board into pieces that are 3/4 of a foot long. How many pieces can we cut? what length of the board will be left?

    asked on May 17, 2012
  38. scottsdale CC

    A car travels around a curve at a constant speed of 80.0 km/h. What is the car’s instantaneous velocity at an instant when it is headed west

    asked on February 20, 2012
  39. math

    does the function f(q)=(q(1-q))^1/2 satisfy the hypothesis of the mean value theorem at the interval [-1,5]

    asked on June 17, 2011
  40. 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
  41. chemestry

    given 43 moles of KCl how much HNO3 is needed to complet the reaction

    asked on December 8, 2010
  42. 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
  43. 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
  44. Math

    If the odds against an event A are 15 to 1, what is the probability associated with event A occurring?

    asked on October 11, 2009
  45. reading

    Describe Ralph's physical features and also his reaction to being on the island

    asked on April 4, 2008
  46. math

    if a 36-inch yardstick casts a 21-inch shadow, how tall is a building whose shadow is 168 feet

    asked on May 11, 2020
  47. Physics

    Your dog is about to sled up the hills shown in the figure below where h1 = 4.0 m and h2 = 5.1 m. You give your dog a little push at the bottom of hill with a speed of 9.0 m/s. (Starts on ground level before h1.) Assume that the friction between the sled

    asked on March 22, 2020
  48. Physics

    When you drop a 0.37 kg apple, Earth exerts a force on it that accelerates it at 9.8 m/s 2 toward the earth’s surface. According to Newton’s third law, the apple must exert an equal but opposite force on Earth. If the mass of the earth 5.98 × 1024 kg,

    asked on October 25, 2019
  49. Physics

    An Alaskan rescue plane traveling 49 m/s drops a package of emergency rations from a height of 177 m to a stranded party of explorers. The acceleration of gravity is 9.8 m/s 2 . Where does the package strike the ground relative to the point directly below

    asked on October 14, 2019
  50. physics

    An Alaskan rescue plane traveling 49 m/s drops a package of emergency rations from a height of 177 m to a stranded party of explorers. The acceleration of gravity is 9.8 m/s 2 . Where does the package strike the ground relative to the point directly below

    asked on October 14, 2019
  51. Math

    I need help with a question 5a-2

    asked on September 18, 2019
  52. 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
  53. 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
  54. 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
  55. 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
  56. Physics

    A rope connects a 40 kg block to a 30 kg block. The rope passes over a pulley at the top of a 37° incline. The 40 kg block rests on the incline and the 30 kg block hangs from the pulley. Calculate the acceleration of either block.

    asked on March 12, 2018
  57. 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
  58. 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
  59. 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
  60. 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
  61. Physics

    A football is kicked from a position on the ground that is 40.0 m from the base of the goal. If the ball strikes the top cross bar which is 3.00 m above the ground, at what two angles could the ball have been kicked? (Assume the ground is horizontal.

    asked on February 25, 2018
  62. Physics

    A daredevil is shot out of canon at 40°above the horizontal with a speed of 25.0 m/s. If the net is located 2.00 m higher than the launch point, what is the horizontal distance to the net if it is to safely catch the daredevil?

    asked on February 25, 2018
  63. Math

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

    asked on October 24, 2017

    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
  65. Math

    Compare: x + y O 19

    asked on September 27, 2017
  66. 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
  67. Math

    A week has five school days and two weekend days.

    asked on November 11, 2016
  68. Research Methods

    7. Consider the following hypothetical outcome of a two-way factorial designs [8 points] Pink/Car Pink/Bike Blue/Car Blue/Bike 58 56 70 21 45 96 69 25 61 88 28 31 59 78 53 23 23 59 65 79 19 65 20 17 48 41 51 18 33 22 69 28 65 46 87 35 27 10 39 20 38 17 75

    asked on November 3, 2016
  69. Math

    Emily bought a pie. Emily ate 2/3 of the pie and Ryan ate 1/5 of the pie. How much of the original pie is left?

    asked on October 27, 2016
  70. 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
  71. geometry

    triangle xyzangle y=90,anglez=60,xz=12cm then what is the length of sideyz

    asked on October 12, 2016
  72. Algebra

    Find a polynomial function of degree 4 with −2 as a zero of multiplicity 3 and 0 as a zero of multiplicity 1. f(x)= Thank you!

    asked on October 2, 2016
  73. Algebra

    Find a polynomial function of degree 6 with −1 as a zero of multiplicity​ 3, 0 as a zero of multiplicity 2​, and 1 as a zero of multiplicity 1. The function is​ f(x) =

    asked on October 2, 2016
  74. 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
  75. 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
  76. 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
  77. math


    asked on July 6, 2016
  78. algebra

    help me on the result of 3CSC{A}-Y6=0 or gave me exmples thank you

    asked on May 27, 2016
  79. 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
  80. 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
  81. 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
  82. 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
  83. Who Am I

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

    asked on March 1, 2016
  84. 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
  85. 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
  86. chemistry

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

    asked on January 11, 2016
  87. physics

    What would the mass of a bowling ball be if it were to travel m/s with a momentum of 7000kg.m/s

    asked on January 9, 2016
  88. La

    5,-15,45,-135 is it arithmetic , geometric or neither ?

    asked on December 16, 2015
  89. 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
  90. 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
  91. 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
  92. 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
  93. Trigonometry and Analysis

    Oscar has twice as many pennies than he has dimes. All together he has $.84. How many dimes and pennies does he have? I tried to solve this, but I know I did it wrong, because I got a decimal for the amount of dimes. Here's what I did: P=D*2

    asked on August 21, 2015
  94. 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
  95. Microeconomics

    A ban on imported avocadoes will result in_______ a. an increase in the total surplus because domestic production will increase. b. no change in total surplus because the reduction in consumer surplus will offset the increase in producer surplus c. a

    asked on June 24, 2015
  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. 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
  99. Microeconomics

    Medical doctors earn higher incomes than people who have a Ph. D in economics. This is partly because A. Medical doctors are more likely to face malpractice lawsuits. B. The costs of receiving necessary medical education are higher C. A relatively small

    asked on May 18, 2015
  100. 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


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