Most 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. 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
  3. 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
  4. Physics

    A train slows down as it rounds a sharp horizontal turn, going from 86.0 km/h to 44.0 km/h in the 13.0 s that it takes to round the bend. The radius of the curve is 140 m. Compute the acceleration at the moment the train speed reaches 44.0 km/h. Assume the

    asked on October 10, 2017
  5. 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
  6. Math

    Yesterday, a parking lot had 60 cars parked in it. Of the cars parked in the parking lot, 40% were silver, 14 were red, and the rest were blue. How many of the cars were blue ( I Picked 6 cars) Answers To Choose:24 cars 38 cars 22 cars or 6 cars

    asked on February 14, 2014
  7. History

    How did John Calhoun react to the Tariff of 1828? A. He used his power as Vice President to influence President Jackson to oppose the tariff. B. He led a charge to impose sticker regulations on the second bank of the United States. C. He devised a force

    asked on August 29, 2017
  8. Math

    A car travels 172 miles using 7 gallons of gas. At that rate, how far can the car travel using 42 gallons of gas ( i got 1,032 ) answers to choose:1,032 miles 1,548 miles 1,204 miles or 1,376 miles

    asked on February 14, 2014
  9. 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
  10. math

    Homeroom 101 and Homeroom 102 share a hallway bulletin board. If Homeroom 101 uses 3/5 of their half to display artwork, what fraction of the board is used to display to display Homeroom 101's artwork? Which is correct-3/5 x 1/2 , 3/5 divided by 1/2. or

    asked on January 29, 2015
  11. 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
  12. Math

    Emily has 85 books on her bookshelf. Of those books, 20% are mysteries, 18 are adventure stories, and the rest are fantasies. What is the simplified ratio of fantasies to total books on her bookshelf (i got 10:17 ) answers list:35:50 7:17 5:8 or 10:17

    asked on February 14, 2014
  13. 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
  14. Physics

    Gamma-ray bursters are objects in the universe that emit pulses of gamma rays with high energies. The frequency of the most energetic bursts has been measured at around 3.0 × 10 21 Hz. The speed of light is 3 × 10 8 m/s. What is the wavelength of these

    asked on March 27, 2012
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. math

    There are 3 red paper clips, 5 yellow paper clips, and 6 silver paper clips in a jar. What is the ratio of the total number of paper clips to the number of red paper clips? 14:3 11:3 3:14 or 3:11

    asked on February 14, 2014
  21. 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
  22. 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
  23. 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
  24. 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
  25. Math

    Which explains why the sequence 64, 4, 1/4,... is arithmetic or geometric? A. The sequence is geometric because it decreases by a factor of 1/16. B. The sequence is arithmetic because it decreases by a factor of 1/16. C. The sequence is geometric because

    asked on March 24, 2015
  26. 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
  27. Math

    Everyone in Andy’s class has to do a science project. Out of the 20 students, 80% have completed their project. How many students still need to finish their projects (got 4 students)

    asked on February 14, 2014
  28. 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
  29. 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
  30. 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
  31. 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
  32. 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
  33. chemistry

    a 2.50-mole quatity of NOCL was initially in a 1.50-L reaction chamber at 400 degrees celcius. after equilibrium was established, it was found that 28.0 percent of the NOCL had dissociated. 2NOCL(g) 2NO(g)+ Cl2(g)

    asked on February 4, 2014
  34. 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
  35. 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
  36. 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
  37. Science

    When are tides in earth's oceans the highest? A. during the moon's waning gibbous phase. B. during the moon's waxing gibbous phase C. when the moon is at a right angle to the sun*** D. when the sun, Earth, and moon are in line

    asked on February 15, 2016
  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

    If the coefficient of sliding friction for steel on ice is 0.05, what force is required to keep a man weighing 150 lbs moving at constant speed along ice?

    asked on January 15, 2017
  40. 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
  41. Linear Algebra

    Given the following vector X, find a non-zero square matrix A such that AX=0: X=[2 -5 3]^T Im not sure how i would find the sqare matrix a?

    asked on October 2, 2017
  42. Chemistry

    Express the rate of the reaction 2C2H6 + 7O2 -> 4CO2 + 6H2O in terms of: a. Delta [C2H6] b. Delta [CO2] Show work please

    asked on April 1, 2011
  43. 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
  44. Chemistry

    Analysis of a sample of an organic compound showed it contains 39.9%carbon,6.9%hydrogen and 53.2%oxygen. a)calculate the empirical formula b)if the relative molecular mass is 60,what is the molecular formula of the compound.(C=12,H=1,O=16)

    asked on December 19, 2015
  45. Physics

    A 5g bullet is fired horizontally and hits an 8kg block of wood (initially at rest) which can move freely. The wood and the bullet move with a velocity of 0.50 m/s after impact. What is the initial velocity of the bullet?

    asked on March 14, 2017
  46. 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
  47. English ll

    I dentify the complete adj. clause. 1. Many Californians who own homes live on hillsides. A: Who own homes live on hillsides. What word does the adj. clause modify? 3. I elected totake astonomy, which is not a required course. A: Astonomy 4. This course

    asked on October 7, 2011
  48. 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
  49. chemistry

    The basicity of tetraoxosulphat(iv)acid is 2 explain this statement with an equation showing the reaction between the acid and potassium hydroxide

    asked on May 6, 2018
  50. math

    I am a little lost on my homework can someone help me with these problems please! With a GM MasterCard, 5% of the amount charged is credited toward a rebate on the purchase of a new car. Express the R as a function of the amount charged A Write a formula

    asked on July 4, 2005
  51. Home Economics

    List ten careers in Home Economics

    asked on September 20, 2008
  52. Science (soon if so)

    Over the years technology has gotten a) smaller**** b) heavier c) less complicated d) more expensive What is nanotechnology? a) Nanotechnology is engineering new elements by changing their atoms***** b)Nanotechnology is a way to lengthen radio waves and

    asked on June 8, 2017
  53. 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
  54. 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
  55. math

    lake superior has a maximum depth of 1.333 thousand feet. there are 5,280 feet in one mile. how deep is lake superior in miles? round to the nearest hundredth if necessary. explain the answer

    asked on January 14, 2015
  56. Physics

    1.)A proton moving with speed v enters a narrow (1.0 cm wide) region of magnetic field perpendicular to the direction of the proton's motion. As a result, the proton acquires a small component of speed perpendicular to its original direction of motion.

    asked on March 13, 2019
  57. Cedar High school

    A compound is found to have 56.4% potassium, 8.7% carbon, and 34.9% oxygen. What is the empirical formula?

    asked on November 29, 2011
  58. Physics

    A spring has a force constant of 546.5 N/m. Find the potential energy stored in the spring when the spring is a) stretched 4.18 cm from equilibrium. Answer in units of J

    asked on December 11, 2011
  59. 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
  60. 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
  61. 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
  62. math

    Using the formula, compute the true annual interest rate. Loan amount = $9,500 Monthly payments = $227.50 Time of loan contract = 5 years True annual interest rate (to the nearest tenth) = _____.

    asked on May 16, 2016
  63. physics

    A child's swing is held up by two ropes ties to a tree branch that hangs 13.0 degrees from the vertical. If the tension in each rope is 2.28 N, what is the combined forece (magnitude and direction) of the two ropes on the swing?

    asked on October 17, 2009
  64. Math

    Find the slope of the following graph

    asked on July 17, 2019
  65. Probability

    Suppose that the lifetime of a farm tractor follows a normal distribution with a mean of eight years and a standard deviation of 1.7 years. If the manufacturer is willing to replace only 5% of the tractors that fail within the warranty period, how long

    asked on January 23, 2018
  66. English

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

    asked on October 6, 2016
  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

    The body of a 1297 kg car is supported on a frame by four springs. The spring constant of a single spring is 1.24 × 10 4 N/m. Four people riding in the car have a combined mass of 259 kg. When driven over a pothole in the road, the frame vibrates and for

    asked on February 16, 2012
  69. Physics

    A spherical glass ornament is 7.00 cm in diameter. An object is placed 11.8 cm away from the ornament. a) Where will its image form? b) What is the magnification of the image

    asked on March 29, 2012
  70. Health

    1. Identify a common defense mechanism that protects you from an uncomfortable feeling. A. reaction formation *** My Answer B. abstinence C. mature behaviors D. acceptance 2. Anger is a normal emotion that all humans feel at some time. It is important to

    asked on February 9, 2018
  71. 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
  72. 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
  73. physics

    A compact disk, which has a diameter of 12.0 cm, speeds up uniformly from zero to 4.40 rev/s in 3.20 s. What is the tangential acceleration of a point on the outer rim of the disk at the moment when its angular speed is 2.00(rev/s)?

    asked on October 17, 2009
  74. Chemistry 111

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

    asked on July 14, 2011
  75. Algebra 2

    The graph of g(x) is the graph of f(x)=x^2 shifted 4 units left, vertically stretched by a factor of 3, then shifted 5 units up. What is the function rule of g(x)? can someone explain how to get the correct answer? how do i solve this?

    asked on September 23, 2019
  76. 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
  77. Analytical chemistry

    Calculate to four decimal places the mass of pure dry CaCO3 required to make 1 L of a 1000 ppm Ca stock solution.

    asked on October 20, 2016
  78. Physics

    A 5 gram bullet is fired horizontally and hits an 8 kilogram block of wood (initially at rest) which can move freely. The wood and the bullet move with a velocity of 0.50 m/s after impact. What is the initial velocity of the bullet?

    asked on March 14, 2017
  79. 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
  80. 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
  81. 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
  82. 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
  83. Algebra

    As Sales Manager for Montevideo Productions, Inc., you are planning to review the prices you charge clients for television advertisement development. You currently charge each client an hourly development fee of $2,600. With this pricing structure, the

    asked on February 21, 2012
  84. 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
  85. Chem

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

    asked on November 4, 2010
  86. 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
  87. Physics

    A bicyclist of mass 65 kg stands on pedal. The crank is .170 m long and makes a 45 angle with the vertical. The crank is attached to the chain wheel which is 9.70 cm. What force must the chain exert to keep the wheel from turning?

    asked on November 12, 2012
  88. 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
  89. 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
  90. physicsss

    A sled weighing 200.0 N is pulled along a horizontal surface with a horizontal force of 45 N. The coefficient of static friction is 0.65 and of kinetic friction is 0.40. What is the force of friction? So I got Ff=200*.4= 80N

    asked on January 15, 2015
  91. 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
  92. 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
  93. physics

    The two forces F1 and F2 act on a 27-kg object on a frictionless tabletop. If F1 = 7.1 N and F2 = 33 N, find the net force on the object and its acceleration. WHAT IN the do i figure this out!

    asked on November 7, 2010
  94. Chem HELP!!!!!!!

    To 0.350L of 0.150M NH3 is added 0.150L of 0.100M MgCl2. How many grams of (NH4)2So4 should be present to prevent precipitation of Mg(0H)2(s)?

    asked on April 18, 2009
  95. 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
  96. Dynamics

    A level fight bomber flying at 300 ft/s releases a bomb at an elevation of 6400 ft. Approximately how long before the bomb strikes the earth?

    asked on January 15, 2017
  97. 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
  98. AP Chemistry

    An aqueous antifreeze is 40.0% ethylene glycol (C2H6O2) by mass. The density of the solution is 1.05 g/cm3. Calculate the molality, molarity, and mole fraction of the ethylene glycol.

    asked on November 28, 2009
  99. mythology

    Can someone tell me if god is real or if it is just a myth? I have a question on my homework and it says something about god but I don't know like anything about it.

    asked on December 12, 2018
  100. Biochem

    HEPES, is a commonly used component of physiological buffers. The PKa of the protonated amino group of HEPES is 7.55 at 25C. Describe the preparation of 1.00L of 0.100M HEPES buffer, pH 8.00, from the sodium salt of the basic form of HEPES (MW 260.3), .0M

    asked on September 13, 2010


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