Popular questions and responses by amy
  1. Statistics

    The weights of the fish in a certain lake are normally distributed with a mean of 15lbs. and standard deviation of 6lbs. If a sample of 5 fish are taken from the lake, find the probability their means weights are between 12.6 lbs. and 18.6 lbs.

    asked on October 30, 2013
  2. statistics

    A survey for brand recognition is done and it is determined that 68% of consumers have heard of Dull Computer Company. If a survey of 800 randomly selected consumers is to be held would it be unusual for 554 of them to recognize Dull Computer Company?

    asked on October 30, 2013
  3. Geometry

    Points $A$ and $B$ are on a circle centered at $O$, and point $P$ is outside the circle such that $\overline{PA}$ and $\overline{PB}$ are tangent to the circle. If $\angle OPA = 32^{\circ}$, then what is the measure of minor arc $AB$, in degrees?

    asked on June 26, 2015
  4. Sat Math

    The bottom of a ski slope is 6,500 feet above sea level, the top of the slope is 11,000 feet above sea level, and the slope drops 5 feet vertically for every 12 feet traveled in the horizontal direction. From the top of the slope, Kayla skis at an average

    asked on August 1, 2018
  5. Sat Math

    0.2B + 0.1S = C Rhia is using the above equation to investigate the carbon footprint, C, in kilograms of carbon dioxide (CO2) emissions, for her morning commute which S miles are by subway and B miles are by bus. How many kilograms of (CO2) per mile does

    asked on August 1, 2018
  6. Probability/Statistics

    A quiz consists of 10 multiple-choice questions, each with 4 possible answers. For someone who makes random guesses for all of the answers, find the probability of passing if the minimum passing grade is 70 %. I'm not sure what to do. I figured that

    asked on July 11, 2009
  7. Kinetics Problem II

    The data below were collected for the following reaction: 2NO2 (g) + F2 (g) ->2NO2F(g) A: Calculate the value of the rate constant, k. B: What is the overall order of the reaction?

    asked on January 30, 2013
  8. Geometry

    Which one of these is NOT a step used when constructing an inscribed square using technology? A. Create a circle using the center with given points tool. B. Connect the points with a line through the center of the circle. C. Mark the points of intersection

    asked on January 20, 2015
  9. algebra 2

    A drama club is planning a bus trip to new york city to see a broadway play. the cost per person for the bus renatl varies inversely as the number of people going on the trip. It will cost $30 per person if 44 people go on the trip. How much will it cost

    asked on May 19, 2014
  10. physics

    A 60.0-kg skier with an initial speed of 12.0 m/s coasts up a 2.50-mhigh rise and angle is 35 degrees.Find her final speed at the top, given that the coefficient of friction between her skis and the snow is 0.0800. (Hint: Find the distance traveled up the

    asked on July 14, 2013
  11. Statistics

    Accrotime is a manufacturer of quartz crystal watches. Accrotime researchers have shown that the watches have an average life of 32 months before certain electronic components deteriorate, causing the watch to become unreliable. The standard deviation of

    asked on November 16, 2016
  12. Math

    2 neon lights are turned on at the same time. One blinks every 4 seconds and the other every 6 seconds, how many times will they blink at the same time?

    asked on September 21, 2015
  13. Chemistry

    If 1.0 mL of 6.0M HCl is added to 499 mL of water to give exactly a 500 mL solution, what is the molarity of the dilute solution?

    asked on May 6, 2012
  14. Math

    F(x)= 3/2x +b In the function above, b is a constant. If f(6)=7, what is the value of f(-2) ?

    asked on November 27, 2016
  15. Calculus

    A ladder 15 feet long is leaning against a building so that end X is on level ground and end Y is on the wall. Point 0 is where the wall meets the ground. X is moving away from the building at a constant rate of 1/2 foot per second. (a.) Find the rate in

    asked on February 5, 2012
  16. chemistry- DrBob

    summarize part a ( the data i showed you) in a data table containing heading: anode, cathode, overall cell reaction, and cell potential . for each cell combination, write the anode half reaction, the cathode half reaction, the overall reaction in the cell

    asked on May 16, 2008
  17. general chemisty

    Calculate the freezing point of a solution of 20.0 g methyl salicylate, C7H6O2, dissolved in 800 g of benzene, C6H6. Kf for benzene is 5.10°C /m and the freezing point is 5.50°C for benzene. A) -1.05°C B) 1.05°C C) 4.45°C D) 6.54°C

    asked on September 26, 2010
  18. I don't understand this chemistry problem?

    The question reads: Place the following elements in order of decreasing atomic size: selenium, chlorine, fluorine, rubidium, calcium, and sulfur. I looked this up on a periodic table and my answer was: Rb, Se, Ca, Cl, F, S. This is still marked wrong, and

    asked on December 3, 2012
  19. can you please look over my answers? clauses

    Can you please look over the answers that I have for the different clause questions? Thanks ahead of time! Ohh, & S-subject, DO-direct object, PN-predicate noun, OP-object of preposition. Thank you! [What I wanted to do] was to finish my work. S The

    asked on December 11, 2011
  20. Chemistry

    In a certain experiment, 1.000 mole of N2 (g) and 1.000 mole of H2 were allowed to react at 500°C in a 1.000-liter flask. The relevant reaction was as follows: N2 (g) + 3H2 (g) -> 2NH3 (g) After the system reached equilibrium, the flask was found to

    asked on August 4, 2020
  21. Math

    If a seed is planted, it has an 85% chance of growing into a healthy plant.if 8 seeds are planted what is the probability that exactly 3 don't grow ?

    asked on May 4, 2016
  22. math

    Catherine borrowed $19,000 on June 20, at 10% interest. If the loan was due on September 17, what was the amount of interest on the loan using the exact interest method?

    asked on June 23, 2013
  23. math

    The first term of an A.P is equal one-half of the common difference,d, find the 8th term of the A.P in the tern of 'd'

    asked on November 3, 2019
  24. production and operations management

    5. All of the following statements about ABC analysis are true except: A. Inventory may be categorized by measures other than dollar volume B. It categorizes on-hand inventory into 3 groups based on dollar volume C. It is an application of the Pareto

    asked on July 29, 2010
  25. Sat Math

    Gary learned that the value of his car depreciates by 15% per year. Which of the following functions best describes the value of his car the year after the car is worth m dollars? A. f(m) = 0.15m B. f(m) = 0.85m C. f(m) = 1 - 0.15m D. f(m) = 1 - 0.85m

    asked on August 1, 2018
  26. math

    Find the circumference of the circle. Round your answer to the nearest hundredth. Use 3.14 or 227 for π. the radius is 3 ft

    asked on April 20, 2020
  27. Chemistry

    which is the stronger acid, HIO4 or HBrO4?

    asked on June 8, 2011
  28. Sat math

    Brian and Richard stand back-t0-back. Each boy takes 5 equally spaced steps, in opposite directions from the starting location. At this point, Richard walks to where Brian is in 9 steps. How many times bigger are Richard's steps than Brian's steps? A. 4/5

    asked on July 18, 2018
  29. Math

    The sides of the rectangle are in the ratio of 4:7. If its length is 31.5 in., find the width, the perimeter, and the area of this rectangle.

    asked on February 7, 2017
  30. Maths

    In a box of chocolates, •one-fifth are plain chocolate •one-sixth are white chocolate •the other 38 are milk chocolate. How many chocolates are there in the box?

    asked on July 16, 2016
  31. Statistics

    The following data set is the GPAs of the students in a statistics class. 1.93, 1.99, 2.00, 2.04, 2.12, 2.34, 2.55, 2.55, 2.75, 2.75, 2.80, 2.80, 2.85, 3.02, 3.12, 3.22, 3.31, 3.33, 3.45, 3.69 What percentile is a GPA of 2.34? A. About the 6th B. About the

    asked on September 23, 2014
  32. Bus. Math

    a. Graduated payments result in the borrower paying A. more at the beginning of the mortgage. B. less at the beginning of the mortgage. C. the mortgage at 1¨M2 the standard rate. D. less at the end of the mortgage. Answer: B 2. When are annuity due

    asked on April 4, 2016
  33. Technical wrtiting

    Internet Source Distortion/Misrepresentation From media,or the Internet, identify an example of each of the following sources of distortion (faulty causal and/or statistical inference) a. A study with questionable sponsorship or motives b. Reliance on

    asked on October 10, 2015
  34. Please help me with this Q

    Find the standard deviation for the given data. Round your answer to one more decimal place than the original data. 22, 29, 21, 24, 27, 28, 25, 36 A. 4.8 B. 4.2 C. 2.8 D. 1.6

    asked on September 23, 2014
  35. physics

    A 65 kg skier speeds down a trail, as shown in Figure 5-24. The surface is smooth and inclined at an angle of θ = 20° with the horizontal. (a) Draw a free-body diagram for the skier. (Do this on paper. Your instructor may ask you to turn in this

    asked on January 13, 2010
  36. Spanish

    Fill in the blanks with questions based on the cues. Remember to use correct capitalization and punctuation. can someone please check my homework 1. ¿? / no / estudiar / tú / en la biblioteca / hoy / por qué A. ¿ Por qué tú no estudiar hoy en la

    asked on February 23, 2014
  37. statistics

    1997, a survey of 940 house holds showed that 15 of them use e-mail. Use those sample results to test the claim that more than 15 % of households use email. use a 0.05 significance level. which of the following is the hypothesis test to be conducted a. h0

    asked on December 10, 2012
  38. Physics

    A dart is thrown at a dartboard 2.37 m away. When the dart is released at the same height as the center of the dartboard, it hits the center 0.447 sec. At what angel relative to the floor was the dart thrown.

    asked on September 25, 2012
  39. Chemistry

    For the following balanced equation: 2 Ag+ (aq) + Cu(s) ---> Cu2+ (aq) + 2 Ag(s) Which letter corresponds to the correct cell notation at standard state conditions? A. Cu2+(aq)/ Cu(s) // Ag(s) / Ag+(aq) B. 2Ag+(aq)/ Cu2+(aq)// 2Ag(s)/ Cu(s) C. Ag+(aq) /

    asked on May 8, 2008
  40. math

    A fruit seller sold 234 apples.He sold twice as many apples as many more apples did he sell?

    asked on July 13, 2017
  41. Stats

    In the past, the mean running time for a certain type of flashlight battery has been 9.8 hours. The manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean running time has

    asked on November 22, 2014
  42. Calculus-rates

    1.) A man 6 ft tall walks at a rate of 5 ft per sec. from a light that is 15 ft above the ground. At what rate is the top of his shadow changing? 2.) An airplane flies at an altitude of 5 miles toward a point directly over an observer. The speed of the

    asked on May 5, 2011
  43. educatial technology

    which of the following statements is true of a time management plan? a. it is a work in progress that will need to be altered many times b. the plan you create is the one you should stick with c. you dont need to schedule breaks or free time d. it isnt

    asked on February 23, 2018
  44. Math

    Find the standard deviation for the given data. Round your answer to one more decimal place than the original data. 15, 42, 53, 7, 9, 12, 14, 28, 47 A. 29.1 B. 16.6 C. 17.8 D. 15.8 is it C

    asked on September 23, 2014
  45. Physics

    A lighthouse beacon alerts ships to the danger of a rocky coastline. Part A According to the lighthouse keeper, with what speed does the light leave the lighthouse? v/c= A boat is approaching the coastline at speed 0.5. According to the captain, with what

    asked on December 2, 2012
  46. Chemistry

    What is the molarity of a solution containing 9.0 moles of solute in 2500 mL of solution? I got this answer: M = (9.0mols/2.5L)= 3.6M Is this correct? Thanks

    asked on May 6, 2012
  47. Physics

    A 23 kg suitcase is being pulled with a constant speed by a handle that is at an angle of 25° above the horizontal. If the normal force exerted on the suitcase is 155 N, what is the force F applied to the handle?

    asked on January 14, 2010
  48. Probability/Statistics

    Using diaries for many weeks, a study on the lifestyles of visually impaired students was conducted. The students kept track of many lifestyle variables including how many hours of sleep obtained on a typical day. Researchers found that visually impaired

    asked on July 11, 2009
  49. word unscramble

    need help unscrambling a word or words tarluna what is it HELP ME UNSCRAMBLE THESE LETTERS TO MAKE A WORD THAT PERTAINS TO SPACE AND IS A P POSSESSIVE NOUN. SEGHRTMLAN J'aodredefis Please post the word or words you need to unscramble, and we'll try to help

    asked on September 28, 2006
  50. Math

    A parking lot contains motorcycles (2 wheels) and cars (4 wheels). There are 35 vehicles and 114 wheels. How many motorcycles and cars are there?

    asked on July 25, 2015
  51. LAW

    1. For defense counsel to be considered ineffective, the defense attorney must: A. perform adequately. B. prejudice the defendant. C. be a public defender. D. only be unreasonable under prevailing professional norms. im confused between B and D 2. Which of

    asked on January 7, 2014
  52. Calculus

    Use a linear approximation (or differentials) to estimate the given number. (32.06)^4/5

    asked on November 18, 2010
  53. physics

    Children slide down a frictionless water slide that ends at a height of 1.80 m above the pool. If a child starts from rest at point A and lands in the water at point B, a horizontal distance L = 2.46 m from the base of the slide, determine the height h of

    asked on October 28, 2016
  54. Math

    Javier rides his bicycle at a rate of 15 miles per hour. How many feet are in 15 miles?

    asked on January 20, 2015
  55. History

    Which of the following describes the main reason the Spanish conquistadors needed Native American slaves? A. They needed help to find gold and send it back to Spain. B. The Native American slaves aided them with their tobacco crops. C. The Spanish wanted

    asked on January 13, 2015
  56. Statistics

    1. A poll of 700 persons attending the Taste of Chicago showed that 455 persons, 65% of the sample, believed that the food was overpriced. It is estimated that 1,250,000 persons attend the Taste. Statistics suggest that, although 65% plus or minus 5% of

    asked on September 12, 2014
  57. Law

    When an appellate court reverses a lower court’s decision, it: A. sends the case back to the trial level for further action consistent with the appellate decision. B. nullifies or sets aside a trial verdict. C. sets the defendant free. D. None of the

    asked on December 9, 2013
  58. Calculating Rate Constants

    I'm really stuck with this one. Here's the rate law and the data that is needed. I appreciate any help Rate= k[I2]X{[H+]Y[CH3COCH3]Z Column 1 - Trial Column 2 - Volume of 0.0010 M I2 Column 3 - Volume of 0.050 M HCl Column 4 - Volume of 1.0 M acetone

    asked on February 13, 2013
  59. Gas Law Chemistry

    I need help on these two questions: If a certain gas occupies a volume of 16L when the applied pressure is 8.0atm , find the pressure when the gas occupies a volume of 4.0L . A certain gas is present in a 12.0L cylinder at 4.0atm pressure. If the pressure

    asked on October 25, 2012
  60. physics

    A science student is riding on a flatcar of a train traveling along a straight horizontal track at a constant speed of 18.0 m/s. The student throws a ball along a path that she judges to make an initial angle of 68.0° with the horizontal and to be in line

    asked on September 18, 2012
  61. Physics

    A sphere of mass 3.0X10^-4 kg is suspended from a cord. A steady horizontal breeze pushes the sphere so that the cord makes a constant angle of 37 degrees with the vertical. find a) the magnitude of that push and b) the tension of the cord. I looked

    asked on November 12, 2006
  62. Sat Math

    If y = m^4 = n^3 and y is greater than 1, the mn =? A. y^1/12 B. y^1/7 C. y^7/12 D. y^7

    asked on July 31, 2018
  63. Math

    A phone company uses the equation y=0.15x+10 to find y, the monthly charges for a customer sending x text messages. How many text messages are sent if the monthly charge is $77.50?

    asked on December 5, 2016
  64. Algebra/Pre Calc

    A parking lot charges $3 to park a car for the first hour and $2 per hour after that. If you use more than one parking space, the second and each subsequent car will be charged 75% of what you pay to park just one car. If you park 3 cars for t hours, which

    asked on July 7, 2015
  65. Ethics and Tech

    The Enlightenment view of addiction is that: A. there is nothing wrong with addiction. B. addiction is not real. C. addiction can never be overcome by will-power alone. D. people are responsible for the choices they make. is it D

    asked on March 23, 2015
  66. Physics I need help someone plz help out

    An example of the neutron absorption reaction is . 1 0 n+10 5 B-->7 3 Li+ 4 2 He The rest masses of each particle in atomic mass units (u) are 1 0 n= 1 u 10 5 B=10 u 7 3 Li =7 u 4 2 He= 4 u where 1u=1.66x10^-27 kg. calculate Q Q= in MeV I have the same

    asked on May 8, 2013
  67. Public Speaking

    For communication to take place, there has to be: A. transmission of the message. B. medium. C. sharing of meaning. D. absence of noise. is it A 2. Which is NOT a benefit of studying public speaking? A. Creates good first impression on others B.

    asked on March 28, 2013
  68. Chemistry

    Show that one mole of KCLO3 contains 122.55 grams. 2 KCLO3(s)->2 KCL(s) + 3 O2(g)

    asked on December 5, 2012
  69. Physics

    The artist Anya Calderona constructs the mobile shown in the figure.(Figure 1) In the illustrated configuration, the mobile is perfectly balanced. Assume the strings and crossbars are massless. If Anya decides to make the star twice as massive, and not

    asked on November 13, 2012
  70. physics

    Truck brakes can fail if they get too hot. In some mountainous areas, ramps of loose gravel are constructed to stop runaway trucks that have lost their brakes. The combination of a slight upward slope and a large coefficient of friction in the gravel

    asked on October 31, 2009
  71. Physics

    A 200h bag of potato chips contains 4.8MJ of energy. How long would it take you working at your maximum body power to consume this energy? So we did 2 trials where we ran up the stairs, and my final power for 1 was 246W and for the other it was 338W. So I

    asked on March 27, 2017
  72. Expected Value extended warranty

    A company estimates that 0.2% of their products will fail after the original warranty period but within 2 years of the purchase, with a replacement cost of $450. If they offer a 2 year extended warranty for $55, what is the company's expected value of each

    asked on October 6, 2016
  73. Criminal law

    1. Which of the following involves rationalizing misconduct by perceiving informal norms – such as secrecy or loyalty to fellow officers – to be more important than societal laws, norms, or the formal norms of the organization by which one is employed?

    asked on March 28, 2014
  74. Intro to Physics

    A sample of an unknown material appears to weigh 295 N in air and 165 N when immersed in alcohol of specific gravity 0.700. (a) What is the volume of the material? ___________m^3 (b) What is the density of the material? ____________ kg/m3 I am getting the

    asked on November 7, 2012
  75. math help

    A lab assistant wants to make FIVE LITERS of 31.2% acid solution. If solutions of 40% and 18% are in stock, how many liters of each must be mixed to prepare the solution. i don't even know what equation to use or anything, please help me, thank you.

    asked on March 29, 2012
  76. Could you please check over my english? :)

    I'm working on an English assignment and I've answered most of them, but I'm not too sure about these ones.. If you could check over my answers that would be amazing! Thank you so much in advance :) In the following sentences identify the main clause. Find

    asked on December 13, 2011
  77. chemistry

    Calculate the pH of 1.28×10−3 M KOH. thanks.

    asked on December 4, 2010
  78. Math

    For a confidence level of 80% with a sample size of 26, find the critical T value. Please help

    asked on June 17, 2020
  79. Math

    A bag of candy contains 11 peppermints, 8 chocolates,13 gumdrops, and 9 licorices. jack randomly takes a gumdrop from the bag and eats it. what is the probability that the next candy she takes will be a gumdrop or a peppermint?

    asked on July 12, 2017
  80. Math

    The ratio of the quantities of sugar and flour needed to bake a cake is 2:5. What is the quantity of sugar needed for a cake, if 750 grams of flour are used to make it?

    asked on November 16, 2015
  81. Science--HELP!!

    Can you please check my answers: 1. Dalton's idea that atoms cannot be divided into smaller parts was disproved by the discovery of _________ (electrons?) 2. The description of the structure of the atom is called ______ (atomic model?) 3. In a water

    asked on June 4, 2015
  82. Vectors Math

    For any vector Vector a find Vector a × Vector a. Explain your result.

    asked on February 22, 2015
  83. Chemistry

    Gaseous methane (CH4) reacts with gaseous oxygen gas (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2o) . What is the theoretical yield of carbon dioxide formed from the reaction of 0.16g of methane and 0.83g of oxygen gas?

    asked on December 6, 2014
  84. Math

    Considering the word Mathematics, what is the ratio of vowels to consonants? Write the ratio 3 ways. word form: colon form: fraction form:

    asked on October 5, 2014
  85. Law

    1. What document guarantees the presumption of innocence until conviction in a court of law? A. United States Constitution B. Articles of Confederation C. Civil Rights Act D. Supreme Court Bylaws im confused between A and C

    asked on June 20, 2014
  86. Algebra

    An object is fired vertically upward with an initial speed of 68.6 meters/second. After t seconds, the height is shown by y = -4.9 t^2 + 68.6 t meters. Given that this object has an initial speed of 68.6 m/s, what is the maximum height it will reach? How

    asked on May 20, 2013
  87. Light Energy Problems

    The binding energy of electrons in a metal is 194 kJ/mol. Find the threshold frequency of the metal. ----------------- The heat of fusion of ice is 6.00 kJ/mol. Find the number of photons of wavelength = 6.78×10^−6 m that must be absorbed to melt 6.80 g

    asked on November 27, 2012
  88. Psychology

    In a classroom experiment, students were asked to place one paper clip in each hand. They were then instructed to add paper clips to the left hand until they were certain that the clips in the left hand weighed more than the paper clips in the right hand.

    asked on June 5, 2011
  89. Preclaculus Help Another

    cot(40) - ((sin(50))/(sin(40)) = ? I thought the answer might be 0, but I'm not quite sure. please provide steps, too.

    asked on March 1, 2011
  90. Calculus - dimensions of a box?

    A rectangular box with a square bottom and a volume of 256 cubic feet is to be constructed. The top and bottom cost $ .10 per square foot to make and the four sides cost $ .05 per square foot to make. Find the approximate dimensions of the box which would

    asked on February 12, 2011
  91. Math

    You invest$10 and after a period of 3 month your new balance is $ what factor did money increase Increased by a factor of 4 Decreased by factor of 3 Increased by factor of 6 Increased by a factor of 3

    asked on July 8, 2020
  92. math

    Consider the differential equation dy/dx = -1 + (y^2/ x). Let y = g(x) be the particular solution to the differential equation dy/ dx = -1 + (y^2/ x) with initial condition g(4) = 2. Does g have a relative minimum, a relative maximum, or neither at ?

    asked on April 4, 2020
  93. Pre Calculus

    Find the number of units that produces maximum revenue given by R = 900x-0.1x^2, where R is the total revenue in dollars and x is the number of units sold.

    asked on October 3, 2018
  94. Statistics

    A nutritionist wants to conduct a study to validate the efficacy of an herb as an aid in weight loss. She randomly assigns half of a group of overweight persons to a treatment group who are given the herb with instructions for its use and a planned diet

    asked on September 11, 2014
  95. Chemistry

    What volume of Cl2 gas, measured at 687torr and 34∘C, is required to form 27g of NaCl?

    asked on April 6, 2014
  96. math

    A rectangle is 7 feet longer than it is wide. If its area is 120 square feet, find its length and width. Represent this situation as an equation and solve.

    asked on March 17, 2014
  97. LAW

    1. A “bright-line” decision may be helpful because: A. it is subject to very little interpretation. B. it promotes clarity and predictability. C. it promotes consistency. D. All of the above. is it D

    asked on December 9, 2013
  98. physics

    The units of heat are equivalent to those of which one of the following quantities?

    asked on March 6, 2013
  99. Chemistry - Lewis Dots

    Draw the molecule by placing atoms on the grid and connecting them with bonds. Do not identify the charge on each of these species. Include all lone pairs of electrons. H3COCH3 Draw the ion by placing atoms on the grid and connecting them with bonds. Do

    asked on December 4, 2012
  100. physics

    A string is wound is tightly around a wheel. When the end of the string is pulled through a distance of 10 cm, the wheel rotates through 5 revolutions. What is the radius of the wheel?

    asked on March 6, 2012


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