Popular questions and responses by Angel
  1. Math

    By default, your numerical entry is scored as correct if it is within 1% of the correct answer. A rule of thumb is always to enter at least 3 digits for numerical questions. If the correct answer is 7.48809, which of the following entries would be counted

    asked on September 28, 2011
  2. Chem

    What is the enthalpy for the following reaction? overall: C2H4+H2O--->C2H5OH is -1411kJ correct??

    asked on November 4, 2010
  3. Statistics

    Twelve different video games showing substance use were observed and the duration times of game play ( in seconds) are listed below. The design of the study justifies the assumption that the sample can be treated as a simple random sample. use the data to

    asked on March 24, 2014
  4. Linear Algebra

    Let L be the line with parametric equations x = 2+3t y = 3−2t z = 2+t Find the shortest distance d from the point P0=(−5, 1, −4) to L, and the point Q on L that is closest to P0. Use the square root symbol '√' where needed to give an exact value

    asked on November 26, 2017
  5. Chemistry

    How many milliliters of 5M H2SO4 are required to make a 1500ml of a .002M H2SO4 solution. I used the formula M*L=M * L so mL *5 = 1500 * .002 I got .6mL is this right?

    asked on September 18, 2011
  6. calculus

    If 1300 square centimeters of material is available to make a box with a square base and an open top, find the largest possible volume of the box.

    asked on February 28, 2020
  7. geography

    Explain the effects of the poor service delivery. There must evidence that i actually investigate the poor service delivery physically where possible. Explanation must be with regard to social or Economic or Environmental problem

    asked on April 29, 2017
  8. Algebra

    Justine earned $26,000 during the first year of her job at city hall. After each year she received a 3% raise. Find her total earnings during the first five years on the job.

    asked on April 13, 2016
  9. english

    Choose the sentence in which the verb has a direct object. A. George was furious. B. I walked away. C. They won the game. D. She is insecure.

    asked on June 26, 2012
  10. chemistry

    can anyone help with this problem please..... Potassium chlorate decomposes according to the following equation: 2KClO3 (s) → 2KCl (s) + 3O2 (g). If a 3.00 g sample of KClO3 is decomposed and the oxygen is collected at 24.0 °C and 0.991 atm, what volume

    asked on November 12, 2015
  11. Math

    A retired couple needs $12,000 per year in income to supplement their Social Security. They have $150,000 to invest to obtain this income. They have decided on two investment options: AA bonds yielding 10% per annum and a bank CD yielding 5%. (a) How much

    asked on July 7, 2005
  12. Physics

    1. Two people are pushing a disabled car. One exerts a force of 200 N East, the other a force of 250 N East. What is the net force exerted on the car? 2. Two hockey players strike a puck simultaneously from opposite sides. Red #3 hits it with 40 N of force

    asked on October 11, 2018
  13. science

    A coach tells his little league players that hitting a 0.275 batting average, within 7% percentage error, means that they had a really great season. Seven year old Tommy ended the season hitting a 0.258 batting average. According to his coach, did he have

    asked on August 22, 2017
  14. physics

    A motorcyclist is trying to leap across a canyon by driving horizontally of the cliff that is 70.0 m high at 38.0 m/s. Ignoring air resistance, use energy conservation to find the speed with which the cycle strikes the ground at a height of 35.0m on the

    asked on July 14, 2011
  15. Drug addiction substance

    Human factors that cause ill health.accidents,crises/disaster and an appropriate way to deal with these

    asked on May 16, 2011
  16. HVAC

    Two HVAC/R technicians are discussing the tape used in HVAC/R repairs. Technician A says that cloth duct tape is preferred for use in attics. Technician B says that UL 181 tape is normally required for duct closing systems. Which one of the following

    asked on June 13, 2017
  17. Analytical chemistry

    Calculate the expected concentrations of vitamin B6 and caffeine in the stock solution assuming exactly 0.0506 g of pyridoxine hydrochloride (vitamin B6) and 0.1253 g of caffeine are dissolved in a 100 mL volumetric flask.

    asked on November 23, 2016
  18. Math

    The temperature in the morning was -23.9 degrees farenight. It rose 30.3 degrees by noon and dropped 7.5 degrees by evening. What were the noon and evening tempertures ?

    asked on January 2, 2016
  19. Physics

    A small cork with an excess charge of +6.0 µC is placed 0.25 m from another cork, which carries a charge of −3.2 µC. What is the magnitude of the electric force between the corks? The Coulomb constant is 8.98755 × 10 9 N · m2 /C 2 . Answer in units

    asked on April 29, 2012
  20. Chemistry (PLEASE HELP ME)

    1. According to the phase diagram for water, how is the state of water determined? a. proceed up a vertical line at any given temperature b. read the phase at the intersection of any given temperature and pressure c. at a given pressure, proceed

    asked on October 13, 2011
  21. Math

    A rectangular garden plot 16 by 24 meters is to be bordered by a strip of uniform width x meter so as to double the area. Find x.

    asked on August 1, 2017
  22. English

    Which are features of myths? Check all that apply. supernatural gods or animals fantastic settings humorous elements that entertain the reader an attempt to explain the origin of the universe characters found in everyday life conflicts between worlds,

    asked on October 6, 2016
  23. chemistry

    a first order reaction has a rate constant of 7.5 x 10^-3/s. The time required for th reaction to be 60% complete is

    asked on June 17, 2008
  24. analytical chemistry

    Calculate the concentration of the initial nitrate stock solution (in ppm) if exactly 0.361 g of KNO3 is dissolved in a 1 L volumetric flask with distilled water. Here I want the concentration of nitrogen in ppm.

    asked on September 22, 2016
  25. statics

    Walleye is a common game fish. Adult walleye have a length with a mean of 44 cm and a standard deviation of 4 cm and the distribution of lengths is approximately Normal. What fraction of walleye are longer than 52 cm in length?

    asked on June 22, 2015
  26. math check

    Posted by TchrWill on Thursday, July 14, 2005 at 5:44pm. 2.)The sum of four consecutive odd integers is -336. Set up an equation AND solve for all of the integers. Two ways to approach this. -336/4 = -84 making the 4 consecutive odd numbers -81, -83, -85

    asked on July 17, 2005
  27. Chemistry

    Suppose that a device is using a 5.00-mg sample of silicon that is doped with 1 × 10-5% (by mass) phosphorus. How many phosphorus atoms are in the sample?

    asked on March 6, 2018
  28. algebra

    write an explicit formula for the nth term an for 17,20,23,26

    asked on October 17, 2016
  29. analytical chemistry

    Calculate the concentration of the initial nitrate stock solution (in ppm) if exactly 0.361 g of KNO3 is dissolved in a 1 L volumetric flask with distilled water.

    asked on September 21, 2016
  30. Math

    A balloon 150 meters from the observer is rising vertically at constant rate. After 1 minute the angle of elevation is 28 degrees and 29 minutes. What is the angle after 3 minutes?

    asked on June 22, 2016
  31. math

    A 10-foot ladder is leaning against a wall. The base of the ladder is 2 feet from the base of the building. How far up the building does the ladder fall?

    asked on March 22, 2016
  32. science

    Which of the following represents a heterogeneous mixture? A.saltwater B.air C.bleach and water D.chicken noodle soup I think the answer is D. Chicken noodle soup. I don't know exactly.

    asked on February 2, 2015
  33. chemistry

    A man pushes on a trunk with a force of 250 newtons. The trunk does not move. How much positive work is done on the trunk?

    asked on January 27, 2015
  34. A thanks to Writeacher

    THANK YOU lol thank you very much i now understand wat shes sayin myteacher don't really get it either lol wen i asked him in class so thank you very very much

    asked on November 10, 2010
  35. geometry

    If EF = 2x – 12, FG = 3x – 15, and EG = 23, find the values of x, EF, and FG. The drawing is not to scale.

    asked on September 8, 2010
  36. Chemistry Titration Lab HELP!

    Hi everyone! I just got a new lab that I MUST complete today, and it's about titration- I have absolutely no clue how to do it, it just doesn't make sense to me! I hope that someone can help explain to me how to do it so I can finish ASAP!! Thanks a lot,

    asked on June 11, 2008
  37. physics

    The radius of the planet Venus is nearly the same as that of the earth, but its mass is only 80% that of the earth. If an object weighs W on the earth, what does it weigh on Venus? Calculate the value of 'g' on Venus

    asked on November 26, 2019
  38. Physics

    A charge +q is at the origin. A charge -2q is at x = 6.30 m on the +x axis. (a) For what finite value of x is the electric field zero? (b)or what finite values of x is the electric potential zero? (Note: Assume a reference level of potential V = 0 at r =

    asked on January 20, 2018
  39. MATH

    A dietician is planning a snack package of fruit and nuts. Each ounce of fruit will supply zero units of​ protein, 3 units of​ carbohydrates, and 2 unitss of​ fat, and will contain 20 calories. Each ounce of nuts will supply 2 units of​ protein, 11

    asked on October 19, 2016
  40. English

    Which of the following sentences uses a preposition properly? A. Connor waited in line while Ava parked the car. B. Where is David at? C. There was a big argument between Megan, Abira, and Lena. D. I might of lent him the book, if he had asked

    asked on June 26, 2012
  41. Physics

    A balloon rubbed against denim gains a charge of −2.0 µC. What is the electric force between the balloon and the denim when the two are separated by a distance of 5.0 cm? (Assume that the charges are located at a point.) The value of the Coulomb

    asked on April 29, 2012
  42. AiMS MATH

    -5 Is A Member Of Which Subset Of Real Numbers. a) natural numbers b) whole numbers c) intergers d) rational numbers e) irrational numbers

    asked on January 20, 2011
  43. Math

    x is a partly constant and partly varies with y when y =3, x=7 and when y=6, x=9, find the relationship between x and y.Hence find x when y=4. solution?.

    asked on December 24, 2018
  44. linear algebra

    Let L1 be the line passing through the point P1=(9, 0, 0) with direction vector →d1=[3, 2, −2]T, and let L2 be the line passing through the point P2=(−10, 8, 4) with direction vector →d2=[3, 0, 2]T. Find the shortest distance d between these two

    asked on December 1, 2017
  45. Geometry

    The Design for a Mural is 16 in. Wide and 9 in High. What are the Dimensions of the largest possible complete mural that can be painted on a wall 24 ft wide by 14 ft wide? And Can you Please Explain. I understood how to do it. but which height or width

    asked on December 12, 2011
  46. Chemistry

    I'm confused on this problem A gaseous mixture inside a rigid steel vessel contains 75% CO2 and 25% H2O by volume at 175 degrees C and 225 kPa. The mixture is then cooled to 0 degrees C, thereby condensing the water vapor. What is the pressure of the CO2

    asked on November 27, 2011
  47. Chemistry 111

    How many moles of methane are produced when 8206 moles of carbon dioxide gas react with excess hydrogen gas?

    asked on July 14, 2011
  48. math

    which of the following expressions shows the equation to use in the finding the dimensions of a cube N by N by N with a volume 125 1) n3=125 2) n2=125 3) 3n=125 4) n=125/3 5) not enought info given need help with this problem!!

    asked on August 24, 2010
  49. chemistry

    A drop of oil (volume 0.05cm3) is released from a medicine dropper on to the calm surface of a pond where it spreads out to cover an area of "40m2". Assume that the oil film has a uniform thickness equal to the diameter of a oil molecule. Calculate the

    asked on March 9, 2007
  50. physics

    A negative charge Q1 = -20.0 mC is located at a point X1 = -2.00 m, a positive charge Q2 = 10.0 mC is located at a point X2 = 3.00 m and a positive charge Q3 = 30.0 mC is located at a point X3 = 9.0 m.a. Draw free body diagrams for the electric force

    asked on June 8, 2020
  51. algebra

    is the sequence geometric if so identify the common ratio 2 -4 -16 -36

    asked on February 28, 2020
  52. math

    A gardener has 720 feet of fencing to fence in a rectangular garden. One side of the garden is bordered by a river and so it does not need any fencing.What dimensions would guarantee that the garden has the greatest possible area?

    asked on September 27, 2019
  53. social studies

    1. Drag each idea to the thinker that would agree with it the most. Ideas can be used once or not at all. The best way for a nation to increase wealth is to remove all barriers to trade. added to The power to rule a country is given by God alone, and the

    asked on September 19, 2019
  54. Math

    Find the slope of the following graph

    asked on July 17, 2019
  55. geometry

    Quadrilateral ABCD is transformed according to the rule (x, y) → (y, –x). Which is another way to state the transformation?

    asked on June 13, 2019
  56. Math

    Pradip and pam each have apple slices and orange slices. The ratio of apple slices to the total number of slices is 4 to 11. The ratio of the total number of slices to orange slices on Pam's plate is 13:6. Neither person has more than 20 total slices. Who

    asked on October 16, 2017
  57. Living Waters private school

    Can I choose Human resource or safety officer when am doing maths literacy, economic,business and tourism

    asked on July 29, 2015
  58. Statistics

    Assume that a procedure yields a binomial distribution with n=3 trials and a probability of success of p= 0.90. Use a binomial probability table to find the probability that the number of successes x is exactly 1.

    asked on December 2, 2014
  59. math

    Farmer john has hens, geese, ducks, and two goats the number of hens equals the number if geese and ducks combined . There are 5 fewer geese than ducks. If the total number of animals is 40 how many are ducks

    asked on September 25, 2014
  60. Chemistry

    A sample of gas occupies 100ml at 27 degree Celsius and 740mm pressure. The temperature the gas will have,when its volume is changed to 80ml at 740mm pressure is?

    asked on May 19, 2014
  61. Chemistry/Math

    I'm not sure how to approach this problem. The teacher wants volumetric flow rate (in cm). A commonly used rule of thumb is that average velocity in a pipe should be about 1 m/s or less for "thin"(viscosity about water). If a pipe needs to deliver 6,000

    asked on August 31, 2012
  62. english

    Which sentence below contains a correctly used modifier in italics? A. Joe looked sad at his broken bike. B. The sauce tasted bitterly, and I couldn't swallow it. C. He spoke sharply to his sister. D. I feel badly because I lost the race.

    asked on June 26, 2012
  63. physics

    A girl throws a water-filled balloon at an angle of 50.0 degree(s) above the horizontal with a speed of 12.0 m/s. The horizontal component of the balloon's velocity is directed toward a car that is approaching the girl at a constant speed of 8.00 m/s. (See

    asked on May 17, 2012
  64. chemistry

    what type of reaction is Al+S8=Al2S3

    asked on March 14, 2012
  65. Physics

    When a rattlesnake strikes, its head accelerates from rest to a speed of 26 m/s in 0.3 s seconds. Assume for simplicity that the only moving part of the snake is its head of mass 100 g. How much (average) power does the rattlesnake need to accelerate its

    asked on December 11, 2011
  66. Please help-Math

    Please answer these problem for me.Thanks so much. 1. Border's Bookstore ordered 800 art books. On verifying the order, only 160 books were actually received. The percent of the order missing was: 2. The net price equivalent rate of 9/15/18 is: 3. If the

    asked on October 19, 2011
  67. Chem

    1. According to the phase diagram for water, how is the state of water determined? a. proceed up a vertical line at any given temperature b. read the phase at the intersection of any given temperature and pressure c. at a given pressure, proceed

    asked on October 13, 2011
  68. physics

    A satellite explodes in outer space, far from any other body, sending thousands of pieces in all directions. How does the linear momentum of the satellite before the explosion compare with the total linear momentum of all the pieces after the explosion?

    asked on June 28, 2011
  69. legal terminology

    Defamation through speech or another heard medium is known as A. libel. B. slander. C. damage. D. damage. my answer B

    asked on March 23, 2011
  70. English (Romeo and Juliet)

    Where juliet says: "O romeo, romeo!Wherefore art thou Romeo? Deny thy father and refuse thy name; Or if thou wilt not,be sworn my love, And ill no longer be a Capulet" i don't understand what she is sayin and i don't understand what she means

    asked on November 10, 2010
  71. CALC

    why is the surface area of a cube not the derivative of a volume?

    asked on October 7, 2010
  72. Physics

    A propeller spins at 1880 rev/min. the equals 197 rads/sec b. What is the angular displacement of the propeller in 2.50 s ?

    asked on December 6, 2009
  73. word problem


    asked on July 16, 2005
  74. Statistics

    A committe of 5 members will be chosen from a group of 10 teachers and 5 students. What is the probability that the committee will have A) all teachers? B) 3 teachers and 2 students? C) 3 or 4 teachers?

    asked on January 5, 2018
  75. English

    When summarizing the of a plot, one should notice the key ideas about how the conflict builds.

    asked on October 6, 2016
  76. Math look for patterns

    Marvin counts six $5 bills. Write each value that he counts. What patterns do you see in the ones digits of the values he counts?

    asked on February 10, 2016
  77. Language Arts

    What is the main message of the words that the Statue of Liberty speaks in "The New Colossus" by Emma Lazarus? Key: *** is my answer A. I am a tired, old woman, but I am still strong. B. Welcome to needy immigrants in search of a new home.*** C. America is

    asked on February 9, 2016
  78. Algebra

    Simplify the expression. Assume that all variables represent positive numbers. Write your answer without using negative exponents. (343x^-6y/8y^-8x^6)^-2/3

    asked on September 21, 2015
  79. Chemistry

    The formula for magnesium carbonate is MgCO3. What is the charge of the cation in Ag2CO3? Would it be +1 or +2 because there are two of Ag?

    asked on July 29, 2015
  80. algebra need help

    The highest temperature ever recorded in a certain town was 88 Fahrenheit . the lowest temperature ever recorded there was -24 Fahrenheit what is the difference between the two temperatures.

    asked on April 29, 2015
  81. Social Studies

    Until the 1700s, the mayan calendar was much more accurate than any calendar used in... A. the United States B. Europe C. China D. the Middle East

    asked on March 13, 2015
  82. math

    To make 4 1/2 gallons of ice cream, it takes 6 3/10 gallons of milk. How many gallons of milk does it take to make one gallon of ice cream? Do I divide 6 3/10 by 4 1/2

    asked on February 27, 2015
  83. Physics

    A baseball with mass of 0.145 kg is thrown straight down at the ground. At a particular speed, it has a drag force of 0.4 N acting on it. What is its acceleration at that time? -2.8m/s^2

    asked on December 21, 2014
  84. Physics


    asked on March 10, 2014
  85. English

    Identify the comma splice. A. Sheema applied for a summer internship she accepted a volunteer position at the hospital. B. Sheema applied for a summer internship, she accepted a volunteer position at the hospital. C. Sheema applied for a summer internship

    asked on October 9, 2013
  86. social studies

    how many oceans surrond asia?

    asked on February 12, 2013
  87. collegemathwordproblem

    When a number is decreased by 30%of itself, the result is 28. What is the number?

    asked on October 22, 2012
  88. Science

    I not sure what formula to use for KE or how to find the mass for the equation. Water is flowing through a 2-inch diameter pipe with a velocity of 3 ft/s. Part A What is the kinetic energy of the water in (ft)(lbf)/(lbm)? (lbf) pound force (lbm) pound mass

    asked on August 25, 2012
  89. math

    The total hang time T in seconds, is given by T(h)=^h/2. Where h is the maximum height. If a person jumps 6 ft off the ground, determine for how many seconds the person is in the air.

    asked on April 19, 2012
  90. Physics

    An object 3.35 cm tall is placed 10.8 cm in front of a mirror, which creates an upright image that is 5.61 cm in height. a) What is the magnification of the image?

    asked on April 1, 2012
  91. Physics

    The image of a crayon appears to be 20.6 cm behind the surface of a convex mirror and is 1.64 cm tall. The mirror’s focal length is 54.3 cm. a) How far in front of the mirror is the crayon positioned? Answer in units of cm I keep on getting it wrong so

    asked on April 1, 2012
  92. Physics

    A concave makeup mirror is designed so that a person 25.3 cm in front of it sees an upright image at a distance of 54.0 cm behind the mirror. a) What is the radius of curvature of the mirror? Answer in units of cm

    asked on March 29, 2012
  93. Statistics

    Suppose a basketball player, Player A, made 80% of her free throw attempts last season and that she continues to shoot free throws at the same rate. Assume that free throw attempts are independent. Let the random variable X be the number of free throws

    asked on March 2, 2012
  94. World History

    The world's oldest recognized monarchy is found in _____. a. Kush b. Egypt c. Nubia

    asked on October 13, 2011
  95. Algebra 2 math

    What is the 32nd term of the arithmetic sequence where a1 = 12 and a13 = –60?

    asked on September 19, 2011
  96. Chemistry 111

    what is the molar mass of Butane,C7H10?

    asked on July 14, 2011
  97. Chemistry 111

    How many moles of nitrogen N are there in 71.0g of Nitrous Oxide(N2O)?

    asked on July 14, 2011
  98. Chemistry 111

    What is the mass of 7080 moles of magnesium chloride (MgCl2)?

    asked on July 14, 2011
  99. physics

    Two identical cars have the same speed, one traveling east and one traveling west. Do the cars have the same momentum?

    asked on June 28, 2011
  100. Chemistry

    Can an acidic solution be made less acidic by adding an acidic solution?

    asked on May 11, 2011


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