Popular questions and responses by sandy
  1. chemistry

    Consider the reaction, C2H4 (g) + H2 (g)- C2H6 (g) where -137kJ of heat is released. How many kilojoules are released when 55.3g of C2H4 reacts?

    asked on July 10, 2011
  2. Calculus

    A ball is dropped from a height of 10 feet and bounces. Each bounce is ¨ú of the height of the bounce before. Thus, after the ball hits the floor for the first time, the ball rises to a height of 10(¨ú ) = 7.5 feet, and after it hits the second floor

    asked on April 15, 2009
  3. ashworth

    If the manager __________ here, we could meet the person who __________ all loans. A. were; approves B. was; approves C. were; approve D. was; approve

    asked on October 9, 2016
  4. physics

    A tennis ball has a mass of 0.057 kg. A professional tennis player hits the ball hard enough to give it a speed of 52 m/s (about 117 miles per hour.) The ball moves toward the left, hits a wall and bounces straight back to the right with almost the same

    asked on January 23, 2014
  5. chemistry

    The hybridization of the lead atom in PbCl4 is...?

    asked on November 3, 2012
  6. law

    Suppose the statute of limitations for a particular state is 3 years and the age of majority in that state is 21. If you have medical records for a 13-year-old girl, how long should you maintain them? A. 3 years !@#$%^&il she’s 21 B. 8 years D. Until

    asked on April 20, 2009
  7. trig

    a ferris wheel with a radius of 14m makes one revolution every 30 seconds. the bottom of the wheel is 2.5m above the ground. a) find the equation b) how does the equation change if the graph starts at the centre of rotation

    asked on December 9, 2018
  8. health

    A woman is brought into an emergency room after a severe automobile accident. She’s unconscious and badly injured. Her husband arrives at the emergency room at the same time as she arrives in the ambulance. The doctor explains the wife’s condition to

    asked on April 20, 2009
  9. Biology

    When the electron moves back to lower energy levels in an electron transport chain, energy is a) stored or b) released c)converted to matter d)used to make O2 I'm not sure how to answer this cause isn't it stored as potential energy of H20 and just before

    asked on August 11, 2010
  10. Algebra

    Could someone please help me with this word problem? The City Zoo has different admission prices for adults and children. When three adults and two children went to the zoo, the bill was $80.88. If two adults and three children got in for $76.47, then what

    asked on December 2, 2012
  11. math

    On December 10, 1999, Apple Computers' stock was valued at $615 billion; Microsoft's stock was valued in that quarter at $271 billion. How much more value is Apple's stock at its peak over Microsoft?

    asked on February 4, 2017
  12. MATH

    Suppose that you work at the Peacock Blue store for 40 hours over five days at a rate of $9.25/hour. You then quit your job. Deductions are FICA (7.65%), federal withholding (12%), and state withholding (8%). Your expenses are transportation at $5.25/day,

    asked on April 16, 2015
  13. science

    when copper metal is added to silver nitrate in solution, silver metal and copper (II) nitrate are produced. what mass of silver is produced from 100.g Cu?

    asked on April 19, 2016
  14. legal aspects of health information

    Dr. Pearson has recently been hired into the Central City Internal Medicine Group as its fifth physician. He has recently completed his residency and is eager to enter private practice. Dr.Pearson is introduced to Meredith and Dawn, two members of the

    asked on April 11, 2015
  15. chemistry

    The molar volume of a certain form of solid lead is 18cm3/mol. Assuming cubic closest packed structure, determine the number of Pb atoms per unit cell.

    asked on November 3, 2012
  16. Algebra - HELP!!!

    Can someone help me and check these? 1. Graph the function and identify the domain and range. y = –.5x² (1 point)graph *domain: (–∞, ∞) range: [0, ∞) graph domain: (–∞, ∞) range: (–∞, 0] graph domain: (–∞, ∞) range: (–∞, 0]

    asked on April 22, 2014
  17. math

    A golf ball has a rebound percentage of 60%. If it is dropped from 30 feet, how high will it bounce on the 5th bounce?

    asked on February 12, 2020
  18. Algebra or Math help

    Your friend thinks that the equation k - 3.5 = 21 is a true statement. Is your friend correct? Explain why and how you figured it out

    asked on November 8, 2017
  19. 11

    SinA + sinB/sinA - sinB= tanA+B/2cotA-B/2

    asked on June 5, 2016
  20. physics

    A 0.55 kg block of ice is sliding by you on a very slippery floor at 4 m/s. As it goes by, you give it a kick perpendicular to its path. Your foot is in contact with the ice block for 0.0025 seconds. The block eventually slides at an angle of 23 degrees

    asked on January 23, 2014
  21. Chemistry

    When 0.40 g of impure zinc reacted with an excess of hydrochloric acid, 127 mL of hydrogen was collected over water at 10 degress C The external pressure was 737.7 Torr. a) What volume would the dry hydrogen occupy at 1.00 atm and 298 K ? b) What amount

    asked on December 13, 2012
  22. health

    According to the AMA, what is a key reason behind a physician’s duty of confidentiality to a patient? A. The U.S. Constitution requires a physician’s confidentiality. B. The patient will feel more confident in disclosing information to the physician.

    asked on April 18, 2009
  23. Math

    An employee's annual salary was increased from $22,464.00 to $24,710.40 last year.If it is increased by the same percent this year,what will be the employee's salary? Thanks!

    asked on October 28, 2016
  24. Check math please!

    Anna mixes the letters S, E, L, E, C, T, E, and D thoroughly. Without looking, Mary draws one letter. Expressed as a fraction, decimal, and percentage, what is the probability that E will NOT be the letter Mary selects? A. 3/8, 0.375, 37.5% B. 8/5, 1.6,

    asked on February 25, 2016
  25. Language arts check answers

    If you fail to plan, you plan to fail. simple complex compound

    asked on January 7, 2015
  26. Geometry

    1. Find the diameter of a circle with a circumference of 50 mm. Round your answer to the nearest tenth. a) 16.0 mm b) 26.4 mm c) 8.4 mm d) 33.5 mm 2. Find the area of the circle with the given radius or diameter. Round your answer to the nearest tenth.

    asked on February 26, 2013
  27. statistics

    A local country club has a membership of 600 and operates facilities that include an 18-hole championship golf course and 12 tennis courts. Before deciding whether to accept new members, the club president would like to know how many members regularly use

    asked on February 9, 2013
  28. algebra

    Complete the ordered pair for the given equation. y = -4x - 18 (-5, )

    asked on April 4, 2019
  29. Chemistry

    What is mass in grams of a pure iron cube that has a volume of 4.10 cm3

    asked on April 29, 2016
  30. World Geograpy

    1. With regard to British influences on India, which of the following statements is true? A. The common name for the British Indian Empire was the "British Raj." B. The British East India Company ruled India after a sepoy rebellion in 1867. C. The British

    asked on January 2, 2014
  31. Titration

    Consider the titration of 100.0 mL of 0.100 M NaOH with 1.00 M HBr. Find the pH at the following volumes of acid added and make a graph of pH versus Va: Va = 0, 1, 5, 9, 9.9, 10, 10.1, and 12 mL.

    asked on January 23, 2012
  32. chemistry

    which of the following is reduced in the reaction: Cu(NO3)2 + Zn --- Zn(NO3)2 + Cu

    asked on July 11, 2011
  33. Math

    If Angel plants the same number of flowers in each of 5 rows, he will have none left over. If he plants 1 in the first row and then 1 more in each row than he did in the previous row, he will plant flowers in only 4 rows. how many flowers does he have?

    asked on February 18, 2010
  34. math

    Jenna says that no row or column contains products with only odd numbers. Do you agree? explain.

    asked on October 27, 2014
  35. Calculus

    A steady wind blows a kite due west. The kite's height above ground from horizontal position x = 0 to x = 60 ft is given by the following. y= 155-(1/40)(x-50)^2

    asked on February 4, 2014
  36. World Geograpy

    1. Which of the following were the main proponents of NAFTA? A. Environmentalists B. Human rights groups C. Labor unions D. Large corporations 2. Which of the following is the primary subsistence crop in Latin America? A. Potatoes B. Beans C. Corn D. Wheat

    asked on January 2, 2014
  37. Psychology

    1. A company decides to add a new program that prepares randomly selected sales personnel to increase their number of sales per month. The mean number of sales per month for the overall population of sales people at this national company is 25 with a

    asked on October 5, 2013
  38. geometry

    An equilateral triangle has the area of 25 squared root of 3 squared. What is the height? Round answer to the one decimal place.

    asked on June 2, 2012
  39. chemistry

    Ti(s)+2Cl2(s)-TiCl4(s) compute theoretical yield in moles 8 mol Ti, 8 mol Cl2

    asked on November 25, 2011
  40. chemistry

    Compare the chemical composition of methane and ethanol to carbon dioxide. Which one can be said to be the complete oxidation of glucose? I thought is was methane but I got it wrong can you explain please.

    asked on August 4, 2010
  41. trig math 30

    Find the exact value of cos 8 degrees cos 38 degrees + sin 8 degrees sin 38 degrees

    asked on March 6, 2010
  42. Math

    The computer club invested $2200, part at 4.5% interest and the rest at 7%. The total annuel interest earned was $144. How much was invested at each rate?

    asked on December 17, 2009
  43. Chem

    Which chloride should exhibit the most covalent type of bond? WHY? A) NaCl B) KCl C) BaCl2 D) BeCl2 E) CaCl2

    asked on April 12, 2009
  44. Math

    the interest rate on car loans increase from 8% to 9%. although this is a rise of only 1 percentage point, you will be paying ____% more in interest on you loan. If you interest payment was $400, what would it be with the increase?

    asked on September 26, 2017
  45. Math of investigation

    Two identical circles are to be cut from a 12cm by 9cm sheet of paper. What is the maximum possible radius of these circles? Show that if the length of the sheet of paper is twice the breadth of the paper, then the radius of the largest circles which can

    asked on July 4, 2016
  46. Math - Help!

    The sample space for a roll of two number cubes is shown in the table. (1,1)|(1,2)|(1,3)|(1,4)|(1,5),(1,6) (2,1)|(2,2)|(2,3)|(2,4)|(2,5)|(2,6) (3,1)|(3,2)|(3,3)|(3,4)|(3,5)|(3,6) (4,1)|(4,2)|(4,3)|(4,4)|(4,5)|(4,6) (5,1)|(5,2)|(5,3)|(5,4)|(5,5)|(5,6)

    asked on February 26, 2016
  47. Are all answers right?

    The sample space for a roll of two number cubes is shown in the table. (1,1)|(1,2)|(1,3)|(1,4)|(1,5),(1,6) (2,1)|(2,2)|(2,3)|(2,4)|(2,5)|(2,6) (3,1)|(3,2)|(3,3)|(3,4)|(3,5)|(3,6) (4,1)|(4,2)|(4,3)|(4,4)|(4,5)|(4,6) (5,1)|(5,2)|(5,3)|(5,4)|(5,5)|(5,6)

    asked on February 25, 2016
  48. Math

    Hillside has 12 teams. Each team plays each other teams twice. How many games are played?

    asked on December 16, 2015
  49. physics

    A box containing food supplies for a refugee camp was dropped from a helicopter flying horizontally at a constant elevation of 414.1 m. If the box hit the ground at a distance of 95.3 m horizontally from the point of its release, ... a) what was the speed

    asked on October 16, 2015
  50. Math- MDM4U data Managment

    How do you solve this question. I literally have no idea on where to start. "If the mean of the following numbers is /7, find the c value. Produce an algebraic solution. Numbers: 12, 18, 21, c, 13 Please help.

    asked on March 2, 2015
  51. chemistry

    H3PO4+3Ca(OH)2=Ca3(PO4)2=6H2O If 44.6g of Ca3(PO4)2 are formed in the above reaction, how many moles of H3PO4 must have been consumed?

    asked on October 24, 2014

    The mass of an erlenmeyer flask is 78.639g and the mass of the flask and water is 327.039. If the density of water is 1 g/ml then what is the true volume of the flask? so i had subtracted the mass of just the flask from the mass of the flask and the water

    asked on March 28, 2014
  53. chemistry

    What is the mass of a sample of ammonia that contains 0.750 moles of hydrogen atoms? The answer is 4.26g, but I do not know how to set up the equation.

    asked on February 22, 2014
  54. Crocket

    A 143m wire is cut into three pieces. The second is 3m longer than the first. The third is 4/5 as long as the first. How long is each piece?

    asked on March 22, 2013
  55. statistics

    otorola discovered that the average defect rate for parts produced on an assembly line varies from run-to-run and is approximately normally distributed with a mean equal to 3 defects per million. Assume that the goal at Motorola is for the average defect

    asked on February 22, 2013
  56. Finanical

    4. An investor purchases a mutual fund share for $100. The fund pays dividends of $3, distributes a capital gain of $4, and charges a fee of $2 when the fund is sold one year later for $105. What is the net rate of return from this investment?

    asked on December 19, 2012
  57. psy315

    a psychologist at a mental hospital was asked to determine whether there was any clear difference in the length of stay of patients with different categories of diagnosis. looking at the last 4 patients in each of the 3 major categories , the results in

    asked on September 14, 2012
  58. Math

    How would you graph this piecewise function f(x) = x^2 if lxl < or equal to 1 1 if lxl > 1 Thanks Very Much!

    asked on April 4, 2012
  59. auditing

    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)

    asked on January 8, 2012
  60. Finance

    Your best taxable investment opportunity has an EAR of 4%. You best tax free investment opportunity has an EAR of 3%. If your tax rate is 30%, which opportunity provides the higher after tax interest rate?

    asked on October 13, 2010
  61. psychology

    Watching the news on TV Mr.Velazco sees pictures of starving children in Africa.That morning he had read about the problem of world hunger.The TV images had a greater impact on him because of: A: belief perserverance B: emotional intelligence

    asked on July 25, 2010
  62. science

    A ball is traveling at a constant velocity of 50 m/s and has been traveling for over 2 minutes. What is the ball’s acceleration

    asked on March 8, 2009


    asked on May 19, 2008
  64. science

    a solution contains 2 mEq/ml of KCL (Molecular weight 74.5). If a 20 mL ample of this solution is diluted to 1 liter what is the percent of the resulting solution

    asked on February 22, 2020
  65. pre calc

    The population of a Midwestern city decays exponentially. If the population decreased from 900,000 to 800,000 from 2003 to 2005, what will be the population in 2008? Please help I got 670,422 and the computer marked it round i then tried rounding it to

    asked on March 11, 2017
  66. Check math please!

    Anna mixes the letters S, E, L, E, C, T, E, and D thoroughly. Without looking, Mary draws one letter. Expressed as a fraction, decimal, and percentage, what is the probability that E will NOT be the letter Mary selects? A. 3/8, 0.375, 37.5% B. 8/5, 1.6,

    asked on February 25, 2016
  67. Math

    Kenji has a box containing many blue rods, each one 252 cm long. Mei-Ling has a box containing many green rods, each one 408 cm long. They each start making a long line of rods of their colour by laying rods end to end. After a while, their lines are

    asked on April 22, 2015
  68. Chem

    Copper(I) chloride has Ksp = 1.7 × 10-7. Calculate the molar solubility of copper(I) chloride in (a) 0.0858M HCl solution (b) 0.419 M HCl solution (c) 0.653 M CaCl2 solution

    asked on March 4, 2015
  69. chemistry check my answer

    In an acid base titration 32.5 ml of sodium hydroxide were neautralized by 17.6 ml of 0.180 mol/l sulfuric acid. Calculate the concentration of the sodium hydroxide. I asked this question earlier but i wanted to make sure i got the right answer My answer:

    asked on January 12, 2015
  70. statistics

    Assume that the readings on the thermometers are normally distributed with a mean of 0 degrees and standard deviation of 1.00 degrees C. A thermometer is randomly selected and tested. Draw a sketch and find the temperature reading corresponding to p

    asked on October 30, 2014
  71. English

    Revise the following sentences as needed to create pronoun-antecedent agreement and to eliminate the generic he and any awkward pronoun references. 1. While shopping for a new computer for school, I noticed that a laptop costs much less that they used to.

    asked on September 3, 2014
  72. English

    34.1 Revise the following sentences to eliminate unnecessary shifts in tense, mood, voice, or person and number and between direct and indirect discourse. 1. The greed of the 1980s gave way to the occupational insecurity of the 1990s, which in turn gives

    asked on September 2, 2014
  73. Physics--check answers please

    1. Resolve an acceleration vector of 40m/s^2 [25 degrees E of S] into its components For this I got 17 as my x component and 36 as my y component 2. A player is positioned 35m [40 degrees W of S] of the net. He shoots a puoock 25m [E] to a teammate. What

    asked on June 23, 2014
  74. Math

    Draw a concave quadrilateral that is not an arrowhead

    asked on May 28, 2014
  75. Chemistry: Check my answers please!

    How would each of the following affect the Cr(VI) concentration determined in this experiment? Justify the answers with an explanation. In the experiment, absorption spectroscopy was used to obtain the concentration of Cr(VI) ions. 1) A student adds more

    asked on March 2, 2014
  76. Math

    Mr.Fox's fourth grade class of 20 students had an average of 72% on their last test. However, Rose's mark of 76% had been incorrectly recorded as 56 %. What was the correct class average for the test? A) 82% B) 80% C)73% D) 62%

    asked on February 16, 2014
  77. physics

    A spring of stiffness 127 N/m, and with relaxed length 0.19 m, stands vertically on a table, as shown in the figure. Instead of compressing the spring with a heavy block, with your hand you push straight down on the spring until your hand is only 0.14 m

    asked on January 17, 2014
  78. math

    john is think of a number. If you divide the difference of his number and 12 by 7, and then add 23, the result is 32. what is the number and can you explain your answer?

    asked on January 18, 2013
  79. math

    Tap A fills a tube with cold water in 6 minutes. Tap B fills a tube with hot water in 8 minutes. If water is flowing out from taps A and B at the same time, how long does it take to fill the tubes?

    asked on September 5, 2012
  80. Math

    Mr. Rogers wants to fence in a rectangular garden next to a straight section of the Scioto River. He has 330 feet of fencing to do the entire job. He doesn’t need fencing along the river, and there is a 4.5 foot wide clearance for a gate at one end. What

    asked on March 10, 2012
  81. MATH


    asked on July 15, 2011
  82. AP Calculus

    integrate |sint(t^2)| dt with 0

    asked on April 6, 2011
  83. Finance

    What problems may be indicated by an average collection period that is substantially above or below the industry average?

    asked on December 15, 2010
  84. AP Calculus

    If the linearization of y= cube root of x at x=64 is used to approximate cube root of 66, what is the percentage error? a) .01% b).04% c).4% d)1% e)4%

    asked on December 14, 2010
  85. psychology

    Sexually active undergraduate women who do not consistently use contraceptives see themselves as less vulnerable to unwanted pregnancy than do other undergraduate women.This best illustrates A: the tyranny of choice B: emotion-focused coping C: the Type A

    asked on July 25, 2010
  86. Math 30

    A popular game show begins with the host reading a question to the contestants. One question involves putting 4 events (A, B, C, and D) in chronological order. What is the probability that the contestant gets the question correct is he or she just guesses?

    asked on March 25, 2010
  87. Probability

    A popular game show begins with the host reading a question to the contestants. One question involves putting four events (A, B, C and D) in chronological order. What is the probability that the contestant gets the question correct if he or she just

    asked on March 24, 2010
  88. biology

    what is heterotrophic Hypothesis? please explain well that i can understand because i am doing a research paper on it and i have no clue what it means

    asked on September 28, 2009
  89. Health

    Who is the only person who can authenticate the information in a patient’s medical record? A. The attending physician B. The attending nurse C. The medical facility that’s caring for the patient D. The person who creates the data in the record C

    asked on April 18, 2009
  90. Physics

    A truck is travelling along a straight road at a constant velocity of 50ms^-1 and sees a dog 200-metres away. In an attempt to avoid an accident, the driver has to brake to a sudden stop. Once the brakes are applied, the truck now has an acceleration of

    asked on November 11, 2019
  91. calculus

    Consider the graph of the cosine function shown below. y=4 cos (2 x) a. Find the period and amplitude of the cosine function. b. At what values of θ for 0 ≤ θ ≤ 2π do the maximum value(s), minimum value(s), and zeros occur? so i don't know how to

    asked on February 4, 2019
  92. math

    A plane makes a 240-mile trip against a head wind in 1 hour and 30 minutes and returns, with a tail wind of the same speed, in 1 hour. What is the speed of the wind? A) 80 mph B) 200 mph C) 40 mph D) 160 mph

    asked on July 30, 2018
  93. pre calc

    The population of a Midwestern city decays exponentially. If the population decreased from 900,000 to 800,000 from 2003 to 2005, what will be the population in 2008? Please help I got 670,422 and the computer marked it wrong i then tried rounding it to

    asked on March 11, 2017
  94. Algebra

    -9 times the difference between a number and 63 is equal to the number plus 49 .Write the equation.

    asked on February 4, 2017
  95. Math

    In 35 minutes, 49 customers entered the store. At this rate, how many customers will enter the store in 2 hrs?

    asked on May 9, 2016
  96. Operations with Integers

    On a summer day, the low temperature of 75°F was reached at 6 am. The high temperature was reached 9 hours later, after the temperature rose 16°F. What was the high temperature that day?

    asked on April 3, 2016
  97. One Math

    The sample space for a roll of two number cubes is shown in the table. (1,1)|(1,2)|(1,3)|(1,4)|(1,5),(1,6) (2,1)|(2,2)|(2,3)|(2,4)|(2,5)|(2,6) (3,1)|(3,2)|(3,3)|(3,4)|(3,5)|(3,6) (4,1)|(4,2)|(4,3)|(4,4)|(4,5)|(4,6) (5,1)|(5,2)|(5,3)|(5,4)|(5,5)|(5,6)

    asked on February 25, 2016
  98. math

    Amanda can run 4/5 of a mile in 9 minutes.Express her speed as a unit rate in miles per hour.

    asked on January 21, 2016
  99. Math quadratic function

    Jose bautista hits a baseball that travels for 142m before it lands. The flight of the ball can be modelled by a quadratic function in which x is the Horizontal distance the ball has travelled away from jose, and h(x) is the height Vertical distance of the

    asked on July 23, 2015
  100. Chemistry

    A sealed container comtains 1.50 mol of nitrogen gas, 2.00 mol of oxygen gas and 3.50 mol of argon gas. If the total pressure is 900 kPa, what is the pressure of the nitrogen gas?

    asked on January 18, 2015


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