Popular questions and responses by Donna
  1. math

    how many digits does the number 20^18 have?

    asked on April 15, 2019
  2. college

    if a license plate consists of 2 letters followed by 4 digits, how many different plates could be created having at least one letter or digit repeated? I know its not 6,760,000

    asked on July 30, 2010
  3. science

    A machine has a mechanical advantage of 2. This means its output force is _____. a. 0.5 times greater than the input force b. 2 times smaller than the input force c. 2 times greater than the input force d. 2 times more efficient than the input force

    asked on February 13, 2011
  4. Electrochemistry

    In lab, we did an experiment with electrochemical cells with solutions of ZnSO4, CuSO4, Al2(SO4)3 and MgSO4 and their respective metal electrodes. There are a couple of post-lab questions that I'm not sure about: (1) Summarize Part A with a data table

    asked on May 16, 2008
  5. Electrochemistry

    Qualitively explain the effect of changing concentration of Cu^2+ using your experimental observations and the Keq values below (no calculations required) Cu^2+(aq) + 4 NH3(aq) --> [Cu(NH3)4]^2+(aq) , Keq = 1.2x10^12 CuS(s) --> Cu^2+(aq) + S^2-(aq) , Keq =

    asked on May 16, 2008
  6. Chemistry

    For a reaction between sodium phosphate and strontium nitrate write out the following: a) The balanced molecular equation b) The ionic equation c) The net ionic equation a) I think I have this one: 2 Na3PO4 (aq) + 3 Sr(NO3)2 (aq) --> 6 NaNO3 (aq) +

    asked on May 14, 2008
  7. statistics

    A daily lottery is conducted in which two winning numbers are selected out of 100 numbers. How many different combinations of winning numbers are possible?

    asked on June 9, 2015
  8. child care development

    I have two questions that I need checked. Toddlers are incapable of sharing, even for short periods of time. (true or false) I chose false Secondly,tummy time is a supervised timewhile the infant is awake, during which the infant is ladi on his or her

    asked on June 6, 2015
  9. math

    George saves 18% of his total gross weekly earnings from his 2 part-time jobs. He earns $6.25 per hour from one part-time job and $7.50 per hour from the other part-time job. George works a total of 40 hours between the two jobs each week. What additional

    asked on October 22, 2010
  10. statistics

    The pie chart below shows how the total annual income for a certain family is spent. If the total annual income is , what amount is budgeted for Savings and Insurance combined?

    asked on January 4, 2016
  11. physics

    To measure the static friction coefficient between a 1.6-kg block and a vertical wall, the setup shown in the drawing is used. A spring (spring constant = 400 N/m) is attached to the block. Someone pushes on the end of the spring in a direction

    asked on November 26, 2013
  12. physics

    n object is dropped from rest from a height 5.8 × 106 m above the surface of the earth. If there is no air resistance, what is its speed when it strikes the earth? The acceleration of gravity is 9.81 m/s2 and the radius of the Earth is 6.37 × 106 m.

    asked on April 5, 2011
  13. applied physics

    the work required to lift eleven 94.0lb bags of cement from the ground to the back of a truck is 4340ft lb. what is the distance from the ground to the bed of the truck?

    asked on April 22, 2013
  14. Physical Science

    A force of 400.0N is exerted on a 1,250N car while moving it a distance of 3.0m. How much work is done on the car.

    asked on December 7, 2009
  15. Business Math

    Oakwood plowing company purchased two new plows for the upcoming winter. Oakwood must make a single payment of 25,03 to pay for the plows. As of today he has $24,200. Asuume the Oakwood puts the money in the bank today, what rate of interest will it need

    asked on March 14, 2013
  16. math

    Juan sells suits in a major department store on weekends.He earns a commission of 5% on the first 10 suits, and if he sells more than 10 He earns an additional 3% on the additional suits. Last weekend Juan sold 13 suits at a price of $250 each. What was

    asked on September 24, 2016
  17. Algebra

    write an equation for a rational function that has a vertical asymptote of -4, a horizontal asymptote of 3, and vertically shrinks the graph by a factor of 5 (compared to the graph of y=1/x). So far I have Y=3x/x+4 but I can't figure out how to shrink the

    asked on August 10, 2015
  18. physics!!!

    A small spherical insulator of mass 8.00*10^-2kg and charge +6.00*10^-7C is hung by a thin wire of negligible mass. A charge of -9.00*10^-7C is held 0.450m away from the sphere and directly to the right of it, so the wire makes an angle with the vertical.

    asked on March 22, 2008
  19. Physics

    A block is released from the top of a frictionless incline plane as pictured above. If the total distance travelled by the block is 1.2 m to get to the bottom, calculate how fast it is moving at the bottom using Conservation of Energy.(incline 20 degrees

    asked on October 15, 2013
  20. Informal Logic

    Looking to increase the profits of his lemonade stand, Johann doubled the price of a cup of lemonade from 25 cents to 50 cents. This clearly shows Johann’s lack of business sense, for now he’ll almost certainly sell fewer cups at the new price and

    asked on April 27, 2013
  21. chemistry

    At 900 degrees C, Kc for the reaction is 5.1. if .050 mole of H20 and .100 mole of Fe are placed in a 1L container at 900 degrees C, how many grams of Fe3O4 are present at equilibrium?

    asked on November 4, 2010
  22. Science

    Calculate the molality of 48.2 percent by mass KBr solution?

    asked on April 2, 2019
  23. geometry

    m angle 2=6x-2

    asked on January 25, 2012
  24. MATHS

    How many minutes before 12 noon is it, if one hour ago it was three times as many minutes after 8 am? Thank you

    asked on October 6, 2010
  25. Chemistry

    The burning of methane in oxygen is a highly exothermic reaction. Yet a mixture of methane and oxygen gas can be kept indefinitely without any apparent change. Can someone give me an explanation behind this?

    asked on May 27, 2008
  26. statistics

    A student takes an exam containing 14 multiple choice questions. The probability of choosing a correct answer by knowledgeable guessing is 0.5. At least 9 correct answers are required to pass. If the student makes knowledgeable guesses, what is the

    asked on October 8, 2015
  27. Informal Logic

    In a survey of 10 film historians, half voted for Nosferatu as the greatest vampire film ever made, and the other half voted for Dracula. However, when asked which lead vampire character they considered more charismatic, all of the film critics chose

    asked on April 27, 2013
  28. Math-linear programming

    Which of the following mathematical relationships could be found in a linear programming model? Choose YES if the relationship could be, and NO if it could not. A. YES B. NO 1. B-2A + 7B = 45 2. 4A - B ¡Ü 10 3. A + \ 2B ¡Ý 22 4. 3A + 2B - AB = 12 5.

    asked on July 26, 2010
  29. algebra

    a parachutists rate during a free fall reaches 126 miles per hour. what is the rate in feet per second?

    asked on June 6, 2019
  30. Algebra

    What's the way to solve algebra with pizzazz page 6

    asked on March 31, 2019
  31. chemistry

    How would you prepare 3.5 L of a 0.9M solution of KCl? A. Add 23 g of KCl to a 3.5 L container; then add enough water to dissolve the KCl and fill the container to the 3.5 L mark. B. Add 233 g of KCl to a 3.5 L container; then add enough water to dissolve

    asked on June 13, 2016
  32. Algebra

    Maria needs $2.45 to buy a magazine. The only money she has is a jar of nickels and dimes. Write an equation in standard form for the different amounts of nickels x and dimes y she could use. I tried .05x +.2y+2.35 but could not figure it out

    asked on September 2, 2015
  33. Math

    Formula given: The decibel (dB) scale for measuring loudness, d, is given by the formula d = 10 log base ten(I X 12 to the power of 12) where I is the intensity of sound in watts per square metre. a) Find the number of decibels of sound produced by a jet

    asked on February 16, 2014
  34. physics

    A tray is moved horizontally back and forth in simple harmonic motion at a frequency of f = 1.86 Hz. On this tray is an empty cup. Obtain the coefficient of static friction between the tray and the cup, given that the cup begins slipping when the amplitude

    asked on November 26, 2013
  35. Informal Logic

    Arthur: The solutions to most mystery novels I read are not believable. However, my enjoyment of a mystery novel depends only on its suspenseful mood and colorful characters. Norton: Roughly 80% of the mystery novels I read have believable solutions, which

    asked on April 27, 2013
  36. applied physics

    a gardener pushes a mower a distance of 900m in mowing a yard. the handle of the mower makes an angle of 40.0 degrees with the ground. the gardener exerts a force of 35.0 N alonf the handle of the mower. how much work does the gardener do in mowing the

    asked on April 22, 2013
  37. physical science

    speed decreases as distance decreases for the same time true or false

    asked on June 5, 2012
  38. math

    Three hundred fish are tagged and released into a pond. A month later 100 fish are caught and then released back into the same pond. Of those 100 fish caught only 15 had tags. How many fish are in the pond? Is the answer 2000 fish?

    asked on May 1, 2012
  39. English

    You are a technical writer in a large company, working on a training manual to help hew users learn the company’s computer system. Employees will use your manual in training seminars taught by your company’s trainers. The manual will also serve as an

    asked on September 19, 2011
  40. math

    A researcher predicts that listening to music while solving math problems will make a particular brain area more active. To test this, a research participant has her brain scanned while listening to music and solving math problems, and the brain area of

    asked on August 15, 2011
  41. Chemistry

    The equilibrium constant, Kc is 3.2 x10 -34 at 25C for the reaction 2 HCl(g) H2(g) + Cl2(g). what is The equilibrium expression, Kc for the reaction

    asked on April 27, 2011
  42. Chemistry

    Estimate the solubility of lead (ll) chloride in grams per liter. ksp= 1.7 x 10^-5

    asked on December 10, 2009
  43. psycology

    Which of the following statements regarding sex hormones is true? A.Female sex hormones aren't involved in the primary development of the sex organs. B.Female sex hormones are necessary for the primary development of the sex organs. C.Without sex

    asked on April 8, 2009
  44. Chemistry

    You are carrying out the titration of 100.0 mL of 1.000M acetic acid with 1.000 M sodium hydroxide. Ka = 1.76x10^-5 of acetic acid. (a) Calculate the initial pH of your acetic acid sample. (b) Calculate the pH of the solution after the addition of 25.0mL

    asked on May 13, 2008
  45. physics!!!!!

    A small spherical insulator of mass 8.00*10^-2kg and charge +6.00*10^-7C is hung by a thin wire of negligible mass. A charge of -9.00*10^-7C is held 0.450m away from the sphere and directly to the right of it, so the wire makes an angle with the vertical.

    asked on March 23, 2008
  46. Psychology

    What is a situation where you think it is especially important to make a positive first impression? How do you try to ensure you make a favorable first impression? How can what you do to make a positive impression differ from situation to situation? For

    asked on June 30, 2008
  47. math

    The sum of 4 consecutive integers is t. In terms of t, find the smallest of the four integers

    asked on February 18, 2019
  48. DMMS

    Chemistry What characteristics are shared by all alkali metals and alkaline earth metals? A They conduct electricity very well B They are strong and shiny C They form alkaline solutions when mixed with water D They do not react with water at all

    asked on October 22, 2015
  49. Geometry

    Max is building a spherical model of earth. He is building his model using 2-inch long pieces of wood to construct the radius. The first time he tries to build the model, he uses 3 of the 2-inch pieces of wood end-to-end to make the radius of the model.

    asked on June 9, 2015
  50. Geometry

    A scientist is plotting the circular path of a particle on a coordinate plane for a lab experiment. The scientist knows the path is a perfect circle and that the particle starts at ordered pair (-5, -11). When the particle is halfway around the circle, the

    asked on June 9, 2015
  51. Chemistry

    How many moles of potassium sulfate would you need to prepare 1200 grams of 5.0% sulfate (m/m) solution? Calculate the volume of solution of 3.6 NH4CI needed to prepare 350.0ml of 1.24 M NH4CI. How many grams of ammonium chloride are in the solution you

    asked on June 7, 2015
  52. Geometry

    Al's garden is 18 feet long and 30 feet wide he wants to put a fence post that same distance apart along both the length and the width of the fence what is the greatest distance he can put apart the fence post

    asked on February 5, 2015
  53. Maths

    Find the number of decibels of sound produced by a jet engine at a distance of 50 metres if the intensity is 10 watts per square metre. This time I'll post the given formula too. Sorry to leave it out before! The dB scale for measuring loudness, d, is

    asked on February 15, 2014
  54. physics

    Several people are riding in a hot-air balloon. The combined mass of the people and balloon is 284 kg. The balloon is motionless in the air, because the downward-acting weight of the people and balloon is balanced by an upward-acting 'buoyant' force. If

    asked on September 26, 2013
  55. chemistry

    I need the half reactions for this redox reaction: 2KClO3-----> 2KCl + 3 O2

    asked on June 9, 2013
  56. Informal Logic

    11{2[3(11)35]}> Some politicians claim to support the environment in speeches they make around the country. However, to get to those speeches they ride in gas guzzling, pollution creating private planes. They therefore clearly don’t believe a word of

    asked on April 27, 2013
  57. Informal Logic

    Catherine goes to her local movie theater only to see romantic comedies. Since Catherine did not go to the movies yesterday, there is not a romantic comedy playing at her local theater. The reasoning above is flawed because the evidence (Points : 1) does

    asked on April 27, 2013
  58. applied physics

    an ironworker drops a hammer 5.25m to the ground. what is its speed as it hits the ground?

    asked on April 22, 2013
  59. ECE 203

    I have a power point presentation and need some help. Focus of the Final Project The summative assignment is to develop a PowerPoint presentation designed for a parent meeting. The goal is to inform parents of how your program aligns curriculum plans with

    asked on December 7, 2012
  60. statistics

    A psychologist interested in political behavior measured the square footage of the desks in the official office of four U.S. governors and of four chief executive officers (CEOs) of major U.S. corporations. The figures for the governors were 44, 36, 52,

    asked on August 14, 2011
  61. chemistry

    how many moles of gas are contained in a 50.0L cylinder at a pressure of 100.0 atm and a pressure of 35 C?

    asked on February 21, 2011
  62. Algebra

    Can this be solved? x+y=160 x=4y+9

    asked on February 18, 2011
  63. Chemistry

    Cooking oil has a boiling pt of 200 degress, water is 100 degrees. explain theses facts given the strength of waters hydrogen bonds

    asked on November 30, 2010
  64. math

    A right rectangle and a right triangle prism have the same height. If the lenght of the side of the rectangle base is twice the width, explain how to determine the area of the triangular base in terms of the rectangle base length.

    asked on February 28, 2010
  65. calculus

    y=5/x-3 find the zeros,relative min and max.the max and min find the intervals on which yis positive or negative. on which y is decreasing.intervals y concave up or down.points of inflections

    asked on December 19, 2008
  66. Psychology

    Describe how a person moves through each of the five stages of Levinger's ABC's of relationships model. As you write your description, include answers to the following questions; What do you think people look for in the attrction stage? How do people work

    asked on July 17, 2008
  67. Psychology

    You are to evaluate how well the author used the points described in the text book about conformity and persuasion to explain their reasons for selecting Donnie. In 200 to 300 words. I think Donnie would more likely be persuaded by peer pressures. Although

    asked on July 4, 2008
  68. Math

    1. Find y'(x) when xsecy - 3y sinx = 1 a) (3ycosx - sec y) / (xsec^2y - 3sinx) b) (3cosx - sec x) / (xsecytany - 3sinx) c) (3ycosx - sec y) / (xsecytany - 3sinx) d) (3ycosx - secytany) / xsec^2y - 3sinx) This is what I did: xsecy - 3y sinx = 1 => sec y + x

    asked on May 19, 2008
  69. Math

    A Deer mouse is 7 1/4 inches long. If the tail is 1/2 its body length. How long is it tail?

    asked on March 9, 2020
  70. Math

    List these track throws in order from shorest to longest. 97 3/5 97.25 97 1/8 97 2/9

    asked on March 9, 2020
  71. Math

    A rectangle is 6 1/2 cm in length and 2 cm wide. And 3 cm in height. Find the volume?

    asked on February 25, 2020
  72. geography/math

    On a map with a scale of "1:97500," , a measured distance of 4.5 inches represents what distance in miles?

    asked on December 26, 2019
  73. math

    Solve belove question base on Pigeonhole Principle. A set M=(1,2,......100) is divided into seven subsets with no number in 2 or more subsets. Show that at least one subset either contains four numbers a,b,c, and d such that a+b = c+d or three number p,q

    asked on August 27, 2018
  74. Chemistry

    What is the percentage yield of N2O5 when 68.0g of O2 reacts With N2 according to the reaction equation, with 72.6g of N2O5 being obtained? 2N2 + 5O2 -> 2N2O5

    asked on March 22, 2018
  75. Physics

    Please help me with this its very hard to visualize the problem. The analytical method of adding vectors expressed in terms of their components may be applied to vectors in three dimensions, for which graphical work is inconvenient. Find the magnitude of

    asked on September 26, 2016
  76. Math

    Please this problem to me There is a stack of 8 cards from 1-8 suppose we select a card randomly from the stack, replace it, then randomly select another card What is the probability the first card is a even number and the second card is greater than 6

    asked on May 11, 2016
  77. physics

    A 5 kg block is being pulled on a frictionless surface by a string at an angle of 30o to the horizontal. The tension in the string is 30 N. What is the total work done on the block as it moves a distance of 10 m? Thank you!

    asked on March 21, 2016
  78. Physics

    A 5kg block is being pulled on a horizontal frictionless surface. The tension in the string is 30N. If the block has an initial speed of 2m/s, what is the speed after moving 10 meters? Please help!Thanks

    asked on March 21, 2016
  79. Physics

    A 5kg block is being pulled on a horizontal frictionless surface. The tension in the string is 30N. If the block has an initial speed of 2m/s, what is the speed after moving 10 meters? Please help!Thanks

    asked on March 20, 2016
  80. Math

    Sarah and Noah work at Read On Bookstore and get paid the same hourly wage

    asked on January 6, 2016
  81. history

    the Continental Army and blank were no match against the large number of British soldiers who landed on blank

    asked on October 12, 2015
  82. Geometry

    Trying to help my Autistic child with geometry. Need a simple step by step explanation and answer please. In this open ended question, find each item and include an explanation of how you found each one. Find arc AD. Find angle APD. If arc BC=100 degrees,

    asked on June 9, 2015
  83. Chemistry

    Calculate the volume of solution of 3.6 M NH4CI needed to prepare 350.0ml of 1.24 M NH4CI. How many grams of ammonium chloride are in the solution you created in the above problem.

    asked on June 7, 2015
  84. Great Valley

    How many moles of potassium sulfate would you need to prepare 1200 grams of 5.0% sulfate (m/m) solution? Calculate the volume of solution of 3.6 NH4CI needed to prepare 350.0ml of 1.24 M NH4CI. How many grams of ammonium chloride are in the solution you

    asked on June 7, 2015
  85. Math

    Draw a velocity vector to represent the following (1cm represents 10km/h): a) a girl running around a circular track travelling at 15km/h heading due east. In the solutions, it shows it heading south, why is that?

    asked on February 3, 2015
  86. algebra

    A field goal is 3 points and the extra point after a touchdown is 1 point. a player made 21 field goals and extra point kicks for 49 points. Find the number of field goals and extra points that he made. FG= x extra point =y =49 x+y=49 did i set up the

    asked on December 18, 2014
  87. finance math

    Meg's pension plan is an annuity with a guaranteed return of 7% interest per year (compounded annually). She would like to retire with a pension of $30000 per annum for 15 years. If she works 31 years before retiring, how much money must she and her

    asked on November 12, 2014
  88. physocology

    Race usually refers to the biological characteristics that distinguish one group from another is this true or false

    asked on September 2, 2014
  89. physics

    Two charged bodies exert a force of 0.225 N on each other. If they are moved so that they are one-third as far apart, what force is exerted?

    asked on March 23, 2014
  90. Grade 12 Math Please help!!

    Please can anyone answer this which I have posted previously? Anyone with knowledge of this area of maths? Thanks in anticipation. :) Formula given: The decibel (dB) scale for measuring loudness, d, is given by the formula d = 10 log base ten(I X 12 to the

    asked on February 17, 2014
  91. physics

    A metal sphere hangs from a string and has 2 kg of mass. The sphere has a charge of +7.1 µC. A uniform electric field is turned on and directed to the right.

    asked on January 16, 2014
  92. physics

    A spring stretches by 0.018 m when a 3.6-kg object is suspended from its end. How much mass should be attached to this spring so that its frequency of vibration is f = 2.9 Hz?

    asked on November 26, 2013
  93. physics

    A 30.0-kg block is resting on a flat horizontal table. On top of this block is resting a 15.0-kg block, to which a horizontal spring is attached, as the drawing illustrates. The spring constant of the spring is 340 N/m. The coefficient of kinetic friction

    asked on November 26, 2013
  94. Loans

    A borrower received a 30-year ARM mortgage loan for $120,000. Rate caps are 3/2/6 (first adjustment/subsequent adjustments/total over the life of the loan). The start rate was 3.50% and the loan adjusts every 12 months for the life of the mortgage. The

    asked on November 5, 2013
  95. physics

    A girl is skipping stones across a lake. One of the stones accidentally ricochets off a toy boat that is initially at rest in the water (see the drawing below). The 0.058-kg stone strikes the boat at a velocity of 15 m/s, 15° below due east, and ricochets

    asked on November 4, 2013
  96. physics

    A person pushes a 16.0-kg shopping cart at a constant velocity for a distance of 20.0 m. She pushes in a direction 28.0° below the horizontal. A 54.0-N frictional force opposes the motion of the cart.

    asked on October 11, 2013
  97. physics

    In an automatic clothes dryer, a hollow cylinder moves the clothes on a vertical circle (radius r = 0.36 m), as the drawing shows. The appliance is designed so that the clothes tumble gently as they dry. This means that when a piece of clothing reaches an

    asked on October 11, 2013
  98. Physics

    A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r. A passenger feels the seat of the car pushing upward on her with a force equal to six times her weight as she goes through the dip. If r = 22.0 m, how fast

    asked on October 11, 2013
  99. Physics

    The person in the drawing is standing on crutches. Assume that the force exerted on each crutch by the ground is directed along the crutch, as the force vectors in the drawing indicate. If the coefficient of static friction between a crutch and the ground

    asked on October 11, 2013
  100. physics

    The drawing shows a wire tooth brace used by orthodontists. The topmost tooth is protruding slightly, and the tension in the wire exerts two forces vector T and vector T ' on this tooth in order to bring it back into alignment. If the forces have the same

    asked on October 11, 2013


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