Roy

Most popular questions and responses by Roy
1. Trigonometry

Points A and B 1000 meter apart are plotted on a straight highway running east and west. from A, the bearing of tower C is N32*W and from be, the bearing of C is N64*E. approximate the shortest distance of the tower from the highway. please explain........

2. statistics

suppose that grade point averages of undergraduate students at one university have a bell shaped distribution with a mean of 2.55 and a standard deviation of 0.43. Using the empirical rule, what percentage of students have grade point averages that are

3. Trigonometry

A plane is headed due east with airspeed of 240 mph. if a wind at 40 mph is bloiwing from the north , find the ground speed of the plane.

4. calculus

Find dy/dx, if y= 5e^x/cosx

5. Please do Civics Essay thanks so much

Please Help with essay question. thanks!! In a federal system of government (also known as a federation), the local and state governments share power with the central government, though the central government has final authority. Eplain how this is

6. Calculus

Consider a hemispherical bowl with a radius of 12 cm. The bowl contains water to a depth of 9 cm. The density of the water at any point x cm below the surface of the water is given by 2e^(0.15x) g/cm^3. A. Find the volume of the water in the bowl. B. Find

Gravel is being dumped from a conveyor belt at a rate of 20 cubic feet per minute. It forms a pile in the shape of a right circular cone whose base diameter and height are always equal to each other. How fast is the height of the pile increasing when the

8. Math

The store is selling lemons at \$0.33 each. Each lemon yields about 2 tablespoons of juice. How much will it cost to buy enough lemons to make four 9-inch lemon pies, each requiring half a cup of lemon juice? The first time I tried it, it was 1.32 then i

9. Trigonometry

The perimeter of an isosceles triangle is 6.6824. find its area.

10. College Chemistry

Plaster of Paris is the compound calcium sulfate hemihydrate, CaSO4*1/2H2O What mass of water is liberated when a 2.763 gram sample is heated to constant mass? The sample is 2.763 grams How much of the 2.763 gram sample is water? I need an amount in grams.

11. science(chem)

How many moles of sulfate ions are present in 1.2 mol of aluminum sulfate?

Can you unscramble these letters:afsedrniru

13. Trigonometry

A ladder 5 meter long leans against the wall of an apartment house forming an angle of 50 degrees, 32 minutes with the ground. how high up the wall does it reach?

14. Probability

natalie has a bag that contains eight marbles. she draws out a marble, record its color, and puts it back. if natalie repeats this eight times and does not record any red marbles, can she concludes that there are not any red marbles in the bag? Explain

15. Trigonometry

The hypotenuse of a right triangle is 34cm. find the length of the two legs, if one leg is 14cm longer than the other.

16. math

will some one please!!!! please!!! help me I'm doing wacky wordies, only have 3 to do!!! decimal decimal decimal ed ot overs pos'-i'-tive' thanks so much!!

17. Geography

what mountain range separates Europe and Asia?

18. Calculus

Use implicit differentiation to show dy/dx = [(1-xy)cot(y)]/[x^2 cot(y) + xcsc^2(y)] if xy = ln(x cot y).

19. College Chemistry

Plaster of Paris is the compound calcium sulfate hemihydrate, CaSO4*1/2H2O What mass of water is liberated when a 2.763 gram sample is heated to constant mass?

20. math

find the slope of the line given by each equation (1) 7x+13y=91 (2) 7-3y=9x

21. finance

find the amount for each ordinary annuity if there are payments of \$700.00 at the end of each month into an account that pays 10% per annum, compounded monthly

22. Trigonometry

Three ships are situated as follows: A is 225 miles west of C while B, due south of C, bears S25*10'E from A. a. How far is B from A? b. How far is B from C? c. what is the bearing of A from B? PLEASE EXPLAIN

23. Numerical Analysis

Using the bisection method, Newton’s method, and the secant method, find the largest positive root correct to three decimal places of x3 − 5x + 3 = 0. (All roots are in [−3,+3].)

24. chemistry

determine wheter each of the following reactions occur. 2Ni(s) + MgSO4(aq)---> if it doesnt occur explain why

25. physics 12

A spacecraft of mass 470 kg rests on the surface of an asteroid of radius 1400 m and mass 2.0*10^12. How much energy must be expended so that the spacecraft may rise to a height of 2800 m above the surface of the asteroid? Thanks.

26. Physics

A 0.020 rubber stopper is swung in a horizontal circle by 0.80 cm thread that makes 30.0 revolution every 20 seconds. a.) what is the stopper's speed? T=? v=(2pi(r))/T

27. Maths

1) Simplification (trigonometric ratios of allied angles)? Simplify : i) [cos^2 (2x180-A). tan^2 (180+A). sec^2 (180-A)] / [ sin^2 (3x180+ A). cosec^2 (-A). cot^2 (90+A)] ii)[ cos(90+A). sec(270+A). sin(180-A) ] / [ cosec (-A). cos (270-A). tan (180+A) ]

28. umt

2. A charge of -3.00 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass (radius = 0.1 m). The charges on the circle are -4.0 µC at the position due north and +5.0 µC at the position due east. What is

if you know that AB=0 and A not=to B, what can you say about the equation Ax+By=1? Describe the graph.

30. Geography

where is the mouth of the nile river located? Thanks!!1

31. physics

What is the self-inductance of an air-core solenoid,1m long and 0.05m in diameter,if it has 1400 turns?(a)5.23mH(b)4.84mH(c)3.63mH(d)2.42mH

32. physics

A magnetic field is applied to the plain of a flat coil of copper wire. The time variation of the magnetic flux density is given by Bosinwt.At which of the following values of t is the magnitude of the emf induced in the coil a

33. high shoool algebra

Joy is 20 years older than Bob. Three years ago, Joy was 5 times as old as Bob. How old are they now?

34. Microeconomics

When is international trade an opportunity for workers?

35. Pre-Calc

I am seeking help with this problem Please...Thank you! Find the point on the line y=x+3 in the xy-plane that is closest to the point (3, 2)

36. geometry

brain teasers!!! 7 = h. of r. 10 = a. in the b. of r. 4=h. of the a. thanks!!!!

37. physics

If two wires P and O each of the same length and same material,are connected in parallel to a battery. The diameter of P is half that of Q. What fraction of the total current passes through P?(a)0.2(b)0.25(c)0.33(d)0.5

3/x-5=10/x+2

39. Pre-Calc

Can someone show me how to do this please. I am stuck. find a number x such that e^2x – 12e^x =13

40. statistics

The participants in a weight-loss class lost the following weights (in pounds) after three weeks of dieting:3,6,0,3,0,0 Assuming that these weights constitute an entire population, find the standard deviation of the population. Round your answer to at

41. english

does anyone know where i can find book notes on old jules by mari sandoz?

42. geometry

you just got a n ew dirt bike with really advanced four stroke engine that burns fuel efficiently and you wonder what kind of gas mileage you are getting. like most dirt bikes your new machine has no odometer to record the miles traveled.The rear tire's

1)Bradley is buying ice cream cones. a double scoop cone cost x dollars. A single scoop costs \$0.50 less than a double csoop. A triple scoop cone costs twice as much a single scoop cone. Write an expression to represent the cost of 3 double scoop cones and

44. Geography

The many islands that stretch from Florida to Venezuela are referred to as the? Thanks!!!!

45. us history

who said "we must all hang together, or we shall all hang separtely"? Thank u!

46. algebra

peter is twice as old as paul was when peter was as old as paul is now. the combined ages of peter and paul is is 56 years. how old are peter and paul now?

47. math

think of a number. Triple it. Add 100. double the result. Add 100. divide the result by 4. subtract one a half time the original number. What is the result?

48. algebra

-1 -2 1+x = 72x 1 2 1/1+1/x =1/72x 2 1 2 2 (72x /1)1/1+1/x =1/72x (72x/1) 2 72x +72x=1 got stuck here

49. science

A solutuion is prepared by adding 40 grams of NaC1 to 100 grams of water at 80 degrees Celcius. Describe this solution.

50. physics

A proton with speed v perpendicular to a magnetic field B is experiencing a force F.If the speed of the proton is doubled,the new force is (a)F/2(b)F(c)2F(d)4F

51. maths

If two dice are toced what is the probility of having a sum of 5 as the outcome(a)1/9(b)1/6(c)1/8

52. Trigonometry

Triangle ABC is a right triangle with right angle at C. CD is perpendicular to AB. BC=4 and CD=1. find the area of the triangle ABC.

53. linear math

8x + 6y = -15

54. physics 12

If the Earth has a mass of 5.98*10^24 kg and orbits the Sun at a radius of 1.43*10^11 meters. Find the mass of the Sun. Thank you.

55. chemistry

A NASA satellite showed that in 2003 the ozone hole was much larger than it was in 2002. The 2003 hole measured 1.04 x 107 mi2 in diameter, while the diameter of the 2002 hole was 6.9 x 106 mi2 Calculate the difference in size between the two holes in

56. Finance

Having previously identified the location of its Greenfield investment, Acme, a multi-billion public MNE that is incorporated in the U.S., must next obtain external financing for its proposed overseas production facility. It has been estimated that the

57. Pre-Calc

I am stuck solving this problem, any help please..Many thanks find all numbers x that satisfy the given equation ln(2x) ------- =2 ln(3x)

Q. x^-4/5=16 What is x Q. Suppose 0

59. math

Prove that the limit as n approaches infinity of ((n!)^2)/(2n)! is 0. I'm thinking that you have to use the squeeze theorem, but I'm not quite sure how. help please?

60. english

is there a website for summary notes for old jules by mari sandoz?

Can you unscramble these letters:afsedrniru?

62. wr

cross word!! (4) letter word for too, too (3) letter word for pen pal Thank you so much

63. Algebra 1

Insert grouping symbols in the expression 5 x 8 - 6 division sign 2 You mix them around in any order to get 17? I guss you can use the + sign example 5 x (2+8-4) divided by 2 = 15

64. health

identify major factors that influence fitness potential. Thanks!! roy/cindy genetics, health, age, are some that come to mind. Do you not have a class text book?

65. calculus

Find the definate integal (upper limit 1, lower limit 0) (7-4x)^2dx

66. science

(1) what measurements and what calculation would you need to make in order to determine the density of a rectangular wooden block? (2) a student announced that she had made a sample of a new material that had a density of 0.85g/cm3. from the inforation

67. science

(1) what measurements and what calculation would you need to make in order to determine the density of a rectangular wooden block? (2)

68. Calculus

Use the given derivative to find all critical points of 'f' and at each critical point determine whether a relative maximum, relative minimum, or neither occurs. Assume that 'f' is continuous everywhere. f' (x) = (1-2x)/ ∛(x+3)

69. calculus

Prove that the limit as n approaches infinity of ((n!)^2)/(2n)! is 0. I'm thinking that you have to use the squeeze theorem, but I'm not quite sure how. help please?

70. math

amy drove her car the same distance in six hours that juan drove his car in 5 1/2 hours. find the speed (rate) of amy's car, given that she drove 5 mi/h slower than juan.

71. math

Now the largest: Perimerter sum 4s+2w+2l 150>4s+2*3s + 2*(15-5s) solve for s, then w, then l.

72. Math

a rectangle is 3 times as wide as a square. the rectangle's length is 15 ft shorter than 5 times the square's length. Given that the sum of the two perimeters must be less than 150 ft, find the set of all possible lengths for the rectangle

73. Math

find three consecutive even intergers for which the sum of the first two integers is greater than 9 more than the third integer, and the sum of the first and third integers is less than 17 more than the second integer

74. english

could anyone please tell me how i can find out what some ancient rome words mean? thanks!!

75. geography

To which continent does Israel belong? Thanks!

76. geography

The largest island in the world, located near Canada, is called? Thanks!

77. AIU

WHAT IS A REGIONAL TRADE BLOC? A regional trade bloc is a group of countries that agrees to buy each others products without imposing tariffs.

78. Physics

Ximena stands near the edge of a cliff 20 m above her friend Javier. If she throws a sandwich to Javier at an angle = 30 below the horizontal and it reaches him in 1.0 s, ignoring air resistance, what was the magnitude of the sandwich's initial velocity?

79. algebra

Thank you Reiny, we typed it in incorrectly, but believe we have solved it. Will post later.

80. math

What is the sum of all values of x that satisfy the equation (x2 -5x+5)^(x2 +4x-60) =1? Hint: There are three cases to consider I think I figured out 2 of the cases. The first one being x2 +4x-60=0 while x2 -5x+5=whatever. The second is x2 -5x+5=1 and x2

int sec u du

82. calcus

int tan^3xsec^3x dx

83. calcus

int cosxsinx dx

84. maths

If four coins are flipped in succession,then the number of possible outcomes is(a)8(b)12(c)16(d)14

85. calculus

Find dy/dx, if y= (sinx)^-1

86. physics

An electrical source with internal reistance r is used to operate a lamp of resistance R. What fraction of the total power is delivered to the lamp?(a)R+r/R(b)R-r/R (c)R/R+r (d)R/r

87. Math

Factorise : 1 + a + b + c + ab + bc + ca + abc

88. English

(mean,means)Fluoridated water.........fewer Americans are toothless today. (visit,visits)Grandparents and children alike..........their dentist for regular check ups. (love,loves)Dentists.......the fact that there is more awareness about dental hygeiene.

89. math

what is the formula for working out open cuboid.

90. math

what is the formula for working out open cuboid.

91. math

A pump brings underground water up to ground level. The water flow is measured in litres per minute.The pump fills an 18 litre bucket in 7 seconds.what is the speed of the pump flow

92. Trigonometry

Two sides of a right triangle are 8, 15 and 17 units. if each side is doubled, how many sqare units will the area of the new triangle be?

4X Over 30

94. algebra

10x.12.25y _______________ 2z.30x.20y help

95. Chemistry

I need to calculate this and I am to asume that all numbers are measurements. I am working with signifigant figures. .6260-.015

11b,6=b-5

97. math

3 10 ____ = ____ x-5 x+2

98. Calculus

Use the given derivative to find all critical points of 'f' and at each critical point determine whether a relative maximum, relative minimum, or neither occurs. Assume that 'f' is continuous everywhere. f' (x) = (1-2x)/ ∛(x+3) ∛(x+3)in words is the

99. social studies

how do reform leaders today try wo win support for their causes? thanks