Most popular questions and responses by ruth
  1. Pre calc

    evaluate the expression under the given conditions. cos(θ − ϕ); cos(θ) = 5/13, θ in Quadrant IV, tan(ϕ) = − square root15,ϕ in Quadrant II Anyone know how to do this I have never been this confused in my life

    asked on April 11, 2017
  2. Maths

    Two boats A and B left a port C at the same time on different route .B travelled on a bearing of 150 degree and A travelled 8km and B had travelled 10km ,the distance between the Two boats was found to be 12km .calculate the bearing of A's route from C.

    asked on June 13, 2017
  3. Econ/stats

    The following data represent the number of flash drives sold per day at a local computer shop and their prices. Price (x) Units Sold (y) $34 3 36 4 32 6 35 5 30 9 38 2 40 1 a. Develop a least-squares regression line and explain what the slope of the line

    asked on April 29, 2012
  4. chemistry

    What separatation method used to separate silver chloride (solid))and sodium trioxonitrate

    asked on January 12, 2018
  5. Geography

    What is the relation between geography and chemistry

    asked on October 19, 2011
  6. Chemistry

    Hydrazine has the formula N2H4 and is used as a rocket fuel (e.g. for the Apollo moon rockets). It burns in the following reaction for which the enthalpy change is -583 kJ/mol. N2H4(g) + O2(g) → N2(g) + 2 H2O(g) Calculate the N-N bond enthalpy in

    asked on November 15, 2017
  7. physics

    a galvanometer has a resistance 60 ohm and is of 5mA full scale would you modify it so as to get 0-10V voltmeter

    asked on March 6, 2016
  8. maths

    A straight highway leads to the foot of a tower of height 50m. From the top of the tower, the angles of depression of two cars standing on the highway are 30 degree and 60 degree. What is the distance between the two cars and how far is each car from the

    asked on October 17, 2013
  9. maths

    Three bags of wheat,two bags of corn, and one bag of oats weigh the same as one bag of wheat,one bag of corn and five bags of oats,if two bags of corn and one bag of oats weights 25 pounds and one bags of corn weights 10 pounds,How much does one bag of

    asked on October 8, 2016
  10. History

    Is this ok? The Industrial Revolution was a period from the eighteenth to the nineteenth century during which major changes in agriculture, manufacturing, mining, and transport had a massive effect on the social, economic,and cultural conditions starting

    asked on March 4, 2010
  11. Chemistry

    Describe the manner in which ketohexose acts as a reducing sugar in the Benedict test.

    asked on September 16, 2008
  12. chemistry

    calculate the total vapour pressure of mixture of methanol(64g) and ethanol(92g) at 298K given that the pure vapour pressure of methanol is 90mmHg and ethanol is 45mmHg (C=12, H=1, O=16)

    asked on May 24, 2019
  13. Algebra

    How do I answer this? Robert needs to cut four shelves from a board that is 2.5 meters long. The second shelf is 18 centimeters longer than twice the length of the first shelf. The third shelf is 12 centimeters shorter than the first shelf. The remaining

    asked on April 13, 2015
  14. life orientation

    how can i advise a friend who response to a conflict avoidance that is not a healthy for sustaining positive relationship

    asked on February 3, 2019
  15. Algebra (Quadratics)

    The height y (in feet) of a baseball thrown by a child is y = -1/10 x^2 + 3x + 6 where x is the horizontal distance (in feet) from where the ball was thrown. Will the ball fly over the head of another child 30 feet away trying to catch the ball? (Assume

    asked on September 25, 2014
  16. math

    A limited access highway had an access reduction and lost 1/13 of its exits. If 264 of its exits were left after the reduction how many exits were there originally?

    asked on May 9, 2013
  17. Pre calc

    sin(θ − ϕ); tan(θ) = 5/12 θ in Quadrant III, sin(ϕ) = − sqaure root10/10 ϕ in Quadrant IV. I used the sin equation sin(a)cos(b)-sin(a)cos(b) However I am still getting the wrong answer

    asked on April 11, 2017
  18. Chemisty

    How do i convert 0.0024 to scientific notation

    asked on January 11, 2010
  19. physics

    1)a galvanometer has a resistance of 40 ohm and is of 3 mA full-scale would you modify it to act as a 0-5 A ammeter? 2)the galvanometer described in question 1 is to be converted into a 0-5 V voltmeter. a)when the voltmeter is connected to a

    asked on March 2, 2016
  20. geography

    what factors account for the similarities and differences between the subdivisions in tropical climate zones?

    asked on September 9, 2012
  21. writing

    Still, do-it-yourself renovations is usually a source of pride for new homeowners, no matter how hard or how frustrating. what correction should be made to this sentence? 1)remove the comma after still 2)change is to are 3) change the spelling of usually

    asked on June 10, 2011
  22. Chemistry

    Give a acid-base pairs which produce Na2CO3 as a salt

    asked on October 8, 2014
  23. pre calc

    To measure the height of the cloud cover at an airport, a worker shines a spotlight upward at an angle 75° from the horizontal. An observer D = 600 m away measures the angle of elevation to the spot of light to be 45°. Find the height h of the cloud

    asked on March 27, 2017
  24. writing

    The cost of new homes is high today. Many people are purchasing older homes in need of renovation. the most effective combination of sentences 1 and 2 would include which of the following groups of words? 1) although many homes need renovation 2)although

    asked on June 10, 2011
  25. Math

    2500 students take a college entrance exam. The scores on the exam have an approximate normal distribution with mean u = 52 points and a standard deviation o = 11 points. Estimate the percentage of students scoring 52 points or more. ^ How would you do

    asked on May 7, 2013
  26. chemistry

    what are the limitations of depression of freezing point

    asked on May 25, 2019
  27. physics

    Helium gas occupies a volume of 0.04 m 3 at a pressure of 2 x 10 5 Pa (Nm -2 ) and temperature of 300 K. Calculate (i) the mass of the helium. (ii) the r.m.s. speed of its molecules. (iii) the r.m.s. speed at 432 K when the gas is heated at constant

    asked on October 24, 2016
  28. Math

    An arc of lemgth 28cm subtends an angle at the centre of a circle. In the same circle, what angle does an arc of length 35 subtend

    asked on March 9, 2018
  29. mathematics

    in a class of 50 student,18 offered mathematics, 21 offered chemistry while 16 offered biology, 7 student offered mathematics and biology, 9 student offered chemistry and biology while 5 student offered the three subject combination. a) find the numbers of

    asked on May 29, 2019
  30. mathematics

    perform the indicated operation and express your result In a standard form i) (4+3i) + (6+4i) ii) 3 + 4i/6+3i

    asked on May 29, 2019
  31. introduction to oorganisational psychology

    conflict has always been a part of our lives, especially in the decision making processes. write down a case of multiple approach-avoidance conflict that you have experienced personally. how did you react? do not forget to include all the variance of this

    asked on March 4, 2016
  32. writing

    They emphasized the importance of good maternal and child health care, including the administering of vaccines. what correction should be made to this sentence? 1) replace they with it 2) change emphasized to emphasize 3) change the spelling of importance

    asked on June 10, 2011
  33. Algebra

    Martina hits a volleyball with a velosity of 13 m^s. When she hits the ball it is 1m above the ground. How long will ot take for the ball to hit the ground.

    asked on January 15, 2016
  34. writing

    Doctors in the field of preventive medicine concentrate on "preventing disease and to encourage" good health practices. Best way to write the portion? 1) preventing disease and to encourage 2)prevent disease and to encourage 3)to prevent disease and to

    asked on June 10, 2011
  35. physics

    A stunt flier is moving at 15m/s parallel to the flat ground 100m below,how large must the distance x from plane to target be if a sack of flour released from the place is to strike the target?

    asked on October 8, 2017
  36. physics

    an electron moves in the plane of paper toward the top of the page .a magnetic field is also in the plane of the page and directed toward the right .what is the direction of the magnetic force on the electron ?

    asked on March 10, 2016
  37. maths

    The shadow of a tower standing on a level ground is found to be 2x meters longer when sun's altitude is 30 degree than when it was 45 degree.Find the height of the tower.

    asked on October 17, 2013
  38. physics

    A man of mass 67.1 kg stands on a scaffold supported by a vertical rope at each end. The scaffold has a mass of 24.6 kg and is 3.6 m long. Suppose the man stands to the right from the middle of the scaffold that is a distance one sixth of the length of the

    asked on November 15, 2011
  39. math

    The human resources department of a consulting firm gives a standard creativity test to a randomly selected group of new hires every year. This year, 50 new hires took the test and scored a mean of 111.6 points with a standard deviation of 14.3. Last year,

    asked on December 14, 2018
  40. writing

    Sentence 10: Finally, friends whom you haven't seen in years, long-lost relatives, and even mere acquaintances will begin calling in february to plan a lengthy visit with you in the summer. what correction should be made to this sentence? 1)change friends

    asked on June 10, 2011
  41. Math

    A bucket when a fifth full holds 10 litres .How many litres will it hold when it is full?

    asked on October 29, 2018
  42. Biology

    List 15 mechanical and 15 biological vectors and the diseases they transmit.

    asked on November 13, 2018
  43. Econ/stats

    The following data represent the number of flash drives sold per day at a local computer shop and their prices. Price (x) Units Sold (y) $34 3 36 4 32 6 35 5 30 9 38 2 40 1 a. Develop a least-squares regression line and explain what the slope of the line

    asked on April 29, 2012
  44. Organic Chem

    Write a balanced equation showing the reaction of trimyristin and aqueous NaOH

    asked on October 10, 2011
  45. mathematics

    find the modulus argument and principal argument of each of the following a) i b) -√5

    asked on May 29, 2019
  46. physics

    Suppose a person weighs 160 pounds on Earth. How much would that person weigh on a planet that was three times as massive as Earth and had a radius that was twice that of Earth's?

    asked on September 29, 2011
  47. Physics

    A body travels from rest with acceleration 8m/s(squared)Find its velocity when it has covered a distance of 100 meter?

    asked on August 24, 2014
  48. physics

    What is quantity of heat required to melt down completely 1kg of ice at 30 degree celsius

    asked on May 18, 2016
  49. Physics

    A driver in a car traveling at a speed of 21.8m/s see a cat 101m away on the road. How long will it take for the car to accelerate uniformly to a stop in exactly 90m?

    asked on October 25, 2010
  50. statistics

    Bellevue Hospital in New York City uses 100.6 degrees F as the lowest temperature considered to indicate a fever. a. What percentage of normal and healthy adults would be considered to have a fever? b. Does this percentage suggest that a cuttoff of 100.6

    asked on May 9, 2010
  51. Chemistry

    If 20g of NaCl was used to form a 250cm3 of saturated solution of NaCl at 25oC. Calculate the solubility of the salt in mol/dm3 at that temperature. (Relative density of solution-1).

    asked on December 12, 2018
  52. Math

    Determine the number of diagonals in a regular 40-gpn

    asked on September 13, 2013
  53. History

    This is my introductory paragraph. The Industrial Revolution was a period from the eighteenth to the nineteenth century where major changes in agriculture, manufacturing, mining and transport had a massive effect on the social, economic and cultural

    asked on March 4, 2010
  54. History

    Hello. I am doing an essay on the impact of the industrial revolution. I have done the intoduction and two paragraphs. Please can you give me some feedback. thanks What was the impact of the Industrial Revolution The Industrial Revolution was a period from

    asked on March 3, 2010
  55. physics

    describe the force board experiment to show how to obtain the resultant of two non-parallel coplanar forces acting at a point.

    asked on September 12, 2018
  56. math

    the radius r of a sphere is increasing at a rate of 3cm/min. find the rate of change of the area when r=3cm

    asked on February 22, 2016
  57. Math

    Tanker boats cannot be in the bay when the depth of water is less or equal to 25 feet. Set up an inequality and solve it graphically to determine all points in time, t, on the interval 0 less than or equal to t less than or equal to 24 when tankers cannot

    asked on August 22, 2012
  58. Physics

    7. In a meeting room, there are chairs, a table, and people. Which of these things has a temperature a) lower than, b) greater than, or c) equal to the temperature of the air?

    asked on April 27, 2010
  59. Algebra

    Parking in a student parking lot costs 2.00 for the first half hour and $1.75 for each hour thereafter. A partial hour is charged the same as a full hour. What is the longest time a student can park for $9.00? Show your work.

    asked on March 9, 2013
  60. Pre calc

    A 20-ft ladder is leaning against a building. If the base of the ladder is 7 ft from the base of the building, what is the angle of elevation of the ladder? (Round your answer to one decimal place.) How high does the ladder reach on the building? (Round

    asked on April 4, 2017
  61. physics

    what is the potential energy of 4 point charges each of value Q at the corners of a square of side length a.

    asked on December 28, 2015
  62. physics

    Superman throws a boulder of weight 3800 N at an adversary. What horizontal force must apply to the boulder to give it a horizontal acceleration of 13.5 m/s^2?

    asked on October 19, 2011
  63. math

    write the opposite, reciprocal, and absolute value of each number . A: -1/2 #: 4 C: 0

    asked on September 9, 2011
  64. math

    Express 4.050505... as a fraction

    asked on August 20, 2018
  65. physics

    a conducting loop consisting of a half circle of radius r=0.2m and three straight sections the half circle lies in a uniform magnetic field B that is directed out of the page the field magnitude is given by B=(4t^2 + 2t + 3)T .w/r t is in second. an ideal

    asked on March 31, 2016
  66. physics

    find the drift velocity of the electrons in the copper wire (there are 8.5*10^28 free electrons per m^3 in copper)

    asked on February 18, 2016
  67. stats

    If a random sample of size n = 65 is drawn, find ¦Ìx, ¦Ò x and P(24 ¡Ü x ¡Ü 26). (Round ¦Ò x to two decimal places and the probability to four decimal places.) ¦Ìx = Correct: Your answer is correct.

    asked on March 3, 2014
  68. Algebra

    A sales force has 10 men and 10 women. A production unit of 7 people is set up at random. What is the probality that it will consist of 3 men and 4 women

    asked on September 14, 2013
  69. PHYSIC

    1)What must be the orbital speed of a satellite in a circular orbit 740 above the surface of the earth? 2)What is the period of revolution of a satellite with mass that orbits the earth in a circular path of radius 8000 (about 1630 above the surface of the

    asked on November 8, 2011
  70. College Algebra

    Use rational root theorem and the factor theorem to help solve the following equation X4-2x3-13x2+38x-24=0

    asked on November 6, 2011
  71. PYSICS

    The upward normal force exerted by the floor is 600 N on an elevator passenger who weighs 610 N. What is the reaction force to the upward normal force exerted by the floor? What is the reaction force to weight of the passenger? What is the magnitude of the

    asked on October 19, 2011
  72. History

    By the way. The sentences seem long because your box is not long enough. Thesis:If you do not know the impact of the Industrial revolution, you will not understand anything in this essay. This topic is very good to study because you know about the

    asked on March 4, 2010
  73. physics

    a parallel plate capacitor has an area of 5cm^2 and a capacitance of 3.5PF. the capacitor is connected to a 12v battery .after the capacitor is completely charge up the battery is removed. a)what must be the separation of the plates and the charge density

    asked on February 15, 2016
  74. Math

    Venski and his brother have each agreed to mow half of the front lawn, which is a rectangle, 120 feet by 60 feet. The law mower cuts a 4-foot-wide strip. If Venski starts at one corner and mows around the lawn toward the center, on which trip around will

    asked on April 1, 2014
  75. Algebra

    A 12' ladder leans against a wall at 68 degree angle of elevation. Find the distance from the ladder's base to the wall.

    asked on September 14, 2013
  76. math

    convert the numeral to a numeral in base 10

    asked on May 9, 2013
  77. Pre Algebra

    A wooden railing is 82 feet long. It is to be divided into 4 pieces. Three pieces will be the same length, and the fourth piece will be 2 feet longer than each of the other three. Find the length of each piece.

    asked on February 18, 2013
  78. Criminology

    How does rational choice theory work when someone is commiting a crime

    asked on July 21, 2012
  79. History

    Can someone please proof read my essay! I am running out of time Please! edit,spell check,grammar please What was the impact of the Industrial Revolution The Industrial Revolution was a period from the eighteenth to the nineteenth century where major

    asked on March 4, 2010
  80. History

    I live in The United Kingdom. And we do not do grades we do Year. I am in Year 8 in United Kingdom. What is that in the United States? No it is an essay. I have been completing it because it is due for tomorrow. If you can please read it and make

    asked on March 4, 2010
  81. math

    1285 hrs to manufacture first unit - expects to achieve a 92% unit learning curve - how many hours would be required to manufacture units 51-100

    asked on January 23, 2010
  82. Financial Management

    The management of cooper Equipment is planning to purchase a new milling machine that will cost 160,000 installed.The old machine has been fully depreciated but can be sold for 15,000. The new machine will be depreciated on a straight-line basis over its

    asked on March 15, 2008
  83. Statistics

    A normal population has an expected value of 60 and a variance of 30. Use the central limit theorem to determine what the sample size should be such that the mean has a probability of 90% to fall between the values 58 and 62. One concept of the Central

    asked on August 10, 2006
  84. Statistics

    Suppose X1;X2;...;X5 is a random sample from a n(0; variance) distribution. define U = X1+X2+X3+X4; V = (X2)^2+(X3)^2+(X4)^2+(X5)^2 and W = U/sqrtV. (a) Name the distribution of U/4 and V/(variance) and give the values of their parameters. (b) (i) Compute

    asked on August 10, 2006
  85. math

    express 7.179179... as a fraction

    asked on August 20, 2018
  86. math

    a manufacturer wants to design an open box that has a square base and a surface area of 48sq units what dimension will produce a box with a maximum volume?

    asked on February 15, 2016
  87. physics really stuck

    A sprinter starts from rest and accelerates for 5s. He then travels at a constant velocity for 10s. Finally he slows down to a stop in 5s. Draw a distance time graph to represent his motion.

    asked on September 17, 2014
  88. Physics

    How do you convert a distance time graph to a velocity time graph. In my first distance time graph, i have 3 curves, two are above the x axis the the middle curve is under the x axis. i am confused on how to change this graph into a velocity time graph

    asked on September 16, 2014
  89. math

    A rancher wishes to use 86 ft of fencing to enclose a rectangular paddock and subdivide the region into three smaller areas. If the total enclosed area is 225 ft2, find the dimensions of the enclosed region.

    asked on November 4, 2013
  90. chemistry

    Discuss possible solutions to the reduced supply of light sweet crude oil. I have no idea to answer this question. Please advise me on how to answer it. Thanks in advance

    asked on March 13, 2012
  91. Algebra

    Students in an English class took a final exam. They took equivalent forms of the exam at monthly intervals thereafter. The average score S(t), in percent, after t months was found to be given by . a) What was the average score when they initially took the

    asked on February 1, 2012
  92. French

    thank you so much for taking so much time into helping me have a perfect french essay! I have done the corrections you have told me to do. If i have left something out please state. Could you please go through the essay and make sure the lanuage, grammar

    asked on October 26, 2011
  93. grade 10 social studies

    why was italy the forst to use indo arabic numerals?

    asked on November 16, 2010
  94. History

    Is this better? If you do not know the impact of the Industrial revolution, you will not understand anything in this essay. By the end of the essay you will understand that life was different before the Revolution and after. You will know that not all the

    asked on March 3, 2010
  95. Physical Education

    The ability of your body's joints to move easily through a full range of motion is what? Joint flexibility. I hope this helps. Thanks for asking.

    asked on November 28, 2006
  96. Physical Education

    The smooth and effective working together of your muscles and bones is what? Some call it muscle tone.

    asked on November 28, 2006
  97. Statistics

    Let X1;X2;X3;...;X6 be a random sample from a distribution with the following probability desity function: Fx(x) = (1+4x)/3 for 0

    asked on August 10, 2006
  98. math

    Two fractions have the same denominator,15. The difference between the fractions is 2/5,and the result of dividing one of them by the other is 4/7. What are the fractions?

    asked on September 8, 2018
  99. math

    a candy mixture is made from two kinds of candy one kind costs twice as much per kg as the other kind.$10 worth of the less expensive candy is mixed with $8 worth of the more expensive candy to make 7kg of the mixture what is the price per kg of each kind

    asked on August 19, 2018
  100. physics

    consider a series R-C circuit consisting of a 30 ohm resistor and 20*10^-6F capacitor connected to a 100V,50Hz power supply.find the magnitude of the current and the angle by which the current leads the voltage.

    asked on April 4, 2016


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