# Ruth

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

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.

3. ## 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

4. ## 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

5. ## 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

6. ## life orientation

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

7. ## Geography

What is the relation between geography and chemistry

8. ## 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

9. ## chemistry

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

10. ## 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

11. ## physics

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

12. ## 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

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

14. ## Chemistry

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

15. ## geography

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

16. ## 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

17. ## 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?

18. ## 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

19. ## physics

1)a galvanometer has a resistance of 40 ohm and is of 3 mA full-scale deflection.how 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

20. ## Chemistry

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

21. ## 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.

22. ## 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

23. ## 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

24. ## 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

25. ## 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

26. ## 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

27. ## Chemisty

How do i convert 0.0024 to scientific notation

28. ## Math

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

29. ## Biology

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

30. ## 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

31. ## Organic Chem

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

32. ## 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?

33. ## 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

34. ## 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,

35. ## 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).

36. ## 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

37. ## 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?

38. ## 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

39. ## 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?

40. ## 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.

41. ## 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

42. ## 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

43. ## physics

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

44. ## 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

45. ## 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

46. ## Physics

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

47. ## 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

48. ## physics

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

49. ## 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

50. ## 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.

51. ## 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

52. ## Criminology

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

53. ## 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?

54. ## 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?

55. ## 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

56. ## 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

57. ## 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

58. ## 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

59. ## physics

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

60. ## math

Express 4.050505... as a fraction

61. ## 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 ?

62. ## 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)

63. ## 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?

64. ## 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

65. ## 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

66. ## 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

67. ## math

convert the numeral to a numeral in base 10

68. ## 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

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

70. ## 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

71. ## 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

72. ## 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.

73. ## science

acetic acid has a pka of 4.8 how many ml of 0.1M acetic acid and 0.1M sodium acetate are required to prepare 1L of 0.1M buffer with a PH of 5.8? solve

74. ## 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

75. ## Math

Determine the number of diagonals in a regular 40-gpn

76. ## 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.

77. ## algebra

The formula for calculating the amount of money returned for an initial deposit into a bank account or CD (certificate of deposit) is given by nt n r P A „Ê„Ë „É „º„» „¹ ƒ­ 1ƒy A is the amount of the return. P is the principal amount

78. ## 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

79. ## Physics

A stone is thrown horizontally at 30.0m/s from the top of a very tall cliff. Calculate its horizontal position and vertical position at 2s intervals for the first 10.0 s.

80. ## algebra

x=9/10 4x+y=3 4(9/10) +y= 3

81. ## math

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

82. ## 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

83. ## english

bobpursley, but can you give me an example

84. ## English Criticism

POEM FOR ELSA by Michael Roberts THAT day the blue-black rook fell pitifully dead You wept and stormed, tossing your lovely head, Hurling commiseration into broken skies That wept and wept, vainly as any eyes. You pitifully wept, nor would be comforted

85. ## Physical Education

The ability of your heart and lungs to work effectively when you exercise and to return to normal when you stop is what? Cardiovascular recovery. I hope this helps. Thanks for asking.

86. ## 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

87. ## Math

Solve 1/8^2-3x=2y+2 find x using equation formula

88. ## Math

Solve 1/8^2-3x=2y+2 find x using e question formula

89. ## 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?

90. ## math

express 7.179179... as a fraction

91. ## 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

92. ## world geography

The North African Maghreb states, dominated by the Atlas Mountains, do not include A. Libya. B. Algeria. C. Morocco. D. Tunisia.

93. ## physics

prove that I=square root of (I^2avarage). using I=Iosin(wt)

94. ## phychology

classical conditioning , develop analogy for industry

95. ## chemistry

the reaction A+3B->2C+D is first order with respect to reactant A and second order with respect to reactant B if the concentration of A is doubled the concentration of B is halfed and the rate of the reaction would -------by a factor of --------

96. ## math

a spherical ballon is inflated with gas at the rate 20cm^3 min. how fast is the radius of the ballon changing at the instant when the radius is 2cm

97. ## math

lnx monotonicity

98. ## Math if my answer is correct

The function h(t) = 2 + 50t - 1.862t^2, where h(t) is the height in metres and t is the time in seconds, models the height of a golf ball above the planet Mercury's surface during its flight. A) How long will the ball be above the surface of Mercury? I get

99. ## 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.