1. math

The overall probability of a student failing an exam is 40%. Calculate the probability that in a group of 6 students, at least 4 passed the exam.

2. math

April is training for a marathon by running no less than 55 km per week. She runs at an average rate of 10 km per hour. What is the minimum number of hours, h, she should run? 10h ≥ 55; h ≥ 5.5; 5.5 hours 10h ≤ 55; h ≤ 5.5; 5.5 hours h over ten >

3. programming concepts

Input a list of employee names and salaries stored in parallel arrays. The sal-aries should be floating point numbers in increments of 100. For example, a salary of \$ 36,000 should be input as 36.0 and a salary of \$ 85,900 should be input as 85.9. Find the

4. chemistry

Suppose 100 mL of NO at STP is mixed with 400 mL of O2 at STP. 2 NO (g) + O2 (g)---> 2 NO2 (g) After the reaction goes to completion, what is the partial pressure of NO2 in the resulting mixture of gases at STP? I know the relation between pressure and

5. statistics

A survey found that women's heights are normally distributed with mean 63.5 in. and standard deviation 2.3 in. The survey also found that men's heights are normally distributed with a mean 68.7 in. and a standard deviation 2.8. (a) Most of the live

6. Calculus 1

A woman at a point A on the shore of a circular lake with radius r=4 wants to arrive at the point C diametrically opposite A on the other side of the lake in the shortest possible time. She can walk at the rate of 10mph and row a boat at 5mph. What is the

7. Geography

What are the human features of Niagara Falls?

8. Physics

An archer needs to hit a bull’s eye on a target at eye level 60.0 ft away. If the archer fires the arrow from eye level with a speed of 47.0 ft/s at an angle of 25 degree above the horizontal, will the arrow hit the target?

9. math

a job pays a salary of \$19,00 the first year. during the next 10 years the salary increases by 4% each year. what is the lifetime salary over the 11 year period?

10. statistics

In a test of the effectiveness of garlic for lowering cholesterol, 47 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes in their levels of LDL cholesterol (in mg/dL)

11. Chemistry

how many milliliters of 4 M h2so4 are needed to react completely with 23.7g of Bao2

12. physics

The concrete sections of a certain superhighway are designed to have a length of 26.0 m. The sections are poured and cured at 10.0°C. What minimum spacing should the engineer leave between the sections to eliminate buckling if the concrete is to reach a

13. math

5.6 lb/gal = oz/gal

14. physics

A sample of lead has a mass of 69.00 kg and a density of 1.130 104 kg/m3 at 0°C. (Assume the average linear expansion coefficient for lead is 2.900 10-5(°C−1).) (a) What is the density of lead at 80.00°C? (Give your answer to four significant

15. physics

The pressure gauge on a tank registers the gauge pressure, which is the difference between the interior pressure and exterior pressure. When the tank is full of oxygen (O2), it contains 10.0 kg of the gas at a gauge pressure of 43.0 atm. Determine the mass

16. Algebra 1

Describe how the graphs of y = absolute value of x,and y = absolute value of X -15 are related. 1- Them graphs have the same shape. The y intercept of y = absolute x is 0, and them x intercept of the 2nd graph is -15. 2-m The graphs have the same y

17. Math

A fence 12ft high runs parallel to a tall building at a distance of 2ft from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building?

18. Physics

A projectile is shot vertically upward with a given initial velocity. It reaches a maximum height of 100 m. If, on a second shot, the initial velocity is doubled then the projectile will reach a maximum height of ____________?

19. physics

Gas is confined in a tank at a pressure of 12.7 atm and a temperature of 22.0°C. If two-thirds of the gas is withdrawn and the temperature is raised to 79.0°C, what is the pressure of the gas remaining in the tank?

20. algebra

Rock is thrown from the top of a building. The formula h=-16t+234 describes the height of the rock, h in feet, t seconds after the rock is thrown. how long after the rock is thrown does it hit the ground?

21. Algebra

Suppose that |a-b|+|b-c|+|c-a|=20. What is the maximum possible value of |a-b|?

22. Chemistry

Consider the thermal decomposition of potassium chlorate. 2 KClO3 (s)-----> 2 KCl (s) + 3 O2 (g) A mixture containing KCl and KClO3 weighing 1.80 g was heated producing 1.40 x 102 mL of O2 gas at STP. What percent of the original mixture was KClO3? Is this

23. physics

A copper telephone wire has essentially no sag between poles 34.0 m apart on a winter day when the temperature is −20.0°C. How much longer is the wire on a summer day when the temperature is 32.0°C? (Note: Table 19.1 is available for use in solving

24. chemistry

How much energy (in kilojoules) is needed to heat 4.00g of ice from -11.0∘C to 21.5∘C? The heat of fusion of water is 6.01kJ/mol, and the molar heat capacity is 36.6 J/(K⋅mol) for ice and 75.3 J/(K⋅mol) for liquid water.

25. English

Which diagram correctly represents this sentence? Andy teaches and plays the guitar

26. physics

The active element of a certain laser is made of a glass rod 29.0 cm long and 1.20 cm in diameter. Assume the average coefficient of linear expansion of the glass is equal to 9.00 10-6 (°C)-1. The temperature of the rod increases by 70.0°C. (a) What is

27. Chemistry

How much of a 5.2M sucrose solution should you use to make 81.0mL of a 0.040M solution?

28. math

Ivan bought 8 pounds of flour for \$4 . How many pounds of flour did he get per dollar?

29. physics

A hollow aluminum cylinder 22.5 cm deep has an internal capacity of 2.000 L at 16.0°C. It is completely filled with turpentine at 16.0°C. The turpentine and the aluminum cylinder are then slowly warmed together to 70.0°C. (The average linear expansion

30. entrepreneurship

is increasing the entrepreneurial orientation of firm always a good thing? or are there circumstance or environment in which further pursuit and opportunities can diminish firm performance?

31. algebra 2

find the value of c that makes each trinomial a perfect square. then write the trinomial as a prefect square. x^2-10x+c x^2+60x+c

Two cheeseburgers and one small order of French fries from a fast-food restaurant contain a total of 1120 calories. Three cheeseburgers and two small orders of French fries contain a total of 1870 calories. Find the caloric content of each item.

33. math

A rectangular tank of 5 m long,4 m wide and 5 m high is filled with water to a depth 3 m. If a robot of volume 20 cubic metre is added to the tank, how much will the water level rise?

34. AP CaLC. AB

The upper left-hand corner of a piece of paper 8 in. wide by 17 in. long is folded over to the right-hand edge. How would you fold it so as to minimize the length of the fold? In other words, how would you choose x to minimize y?

35. geometry

A regular hexagon with a perimeter of 24 units is inscribed in a circle. Find the radius of the circle.

36. Math

The altitude of a plane as it begins to descend is shown by the linear equation a = 22,000 – 800m, where a is the plane’s altitude, in feet, and m is minutes. What is the plane’s altitude when m = 12? ft

37. chemistry

Which term has the same numerical value for the forward reaction as it has for the reverse reaction, but with opposite sign? a. ^E ( delta E) b. Ea1 c. Ea’ d. Ea2

38. Algebra

Find all values of t such that [t] =2t+3. If you find more than one value, then list the values you find in increasing order, separated by commas. The brackets represent the floor sign function.

39. Criminology

According to proponents of capital punishment, which of the following is a true statement? A. Capital punishment deters crime. B. Capital punishment is less expensive than imprisonment. C. Capital punishment is widely accepted in the international

40. physics

A 4.10 kg block is pushed along the ceiling with an constant applied force of F = 81.5 N that acts at an angle è = 52° with the horizontal, as in the figure below. The block accelerates to the right at 5.10 m/s2. Determine the coefficient of kinetic

A total of \$22,000 is invested in two municipal bonds that pay 4.25% and 5.75% simple interest. The investor wants an annual interest income of \$1085 from the investments. What amount should be invested in the 4.25% bond?

42. chem

When Mg reacts with HCl, it produces MgCl2 and H2(g). If 2.34 g of Mg react, how much MgCl2 is produced (in grams)?

43. History

Word Bank : Popular Sovereignty, Republicanism, Federalism, Separation of Powers, Checks and Balances, Limited gov, Individual Rights 1. aidivion of power between the states and federal gov some power is reintaed for the federal gov some for the states and

44. precalculus

(A) find the domain of the function, (B) decide if the function is continuous, and (c) identify your horizontal and vertical asymptotes. F(x)= (3x^2+1)/(x^2+x+9) Find the zeros (if any) of the rational function. G(x)= (x^3-8)/x^2+4 H(x)=5 + 3/(x^2+1) G(x)=

45. math

what are two fractions both not positive who has a product of 5/8

46. easy geometry

1)If diagonals of a rhombus are 10 cm and 24 cm. find the area and perimeter of the rhombus. 2)A regular hexagon with a perimeter of 24 units is inscribed in a circle. Find the radius of the circle. 3)Find the altitude,perimeter and area of an isosceles

47. chemistry

The solubility of NaCl at 17 celsisus degrees is 39 g per 100 ml water. If 83 g of NaCl is dissolved in 250ml of water at the same temperature, the resulting solution is: a)unsaturated; b)saturated; c)supersaturated

48. Physics

What is the frequency of a sound wave in air at 20°C that has a wavelength of 0.4 m?

49. precalculus

hi! The question is: a.)identify any horizontal and vertical asymptote and (b) identidify any holes in the graph. Verify your answers numerically by creating a table of values. 14.) f(x)= 3/(x-2)^3 16.) f(x)= x^2+2x+1)/2x^2-x-3 18.) 3-14x-5x^2)/3+7x+2x^2

50. geography

What are the major events that happened in the precambrian era?

51. physics

In state-of-the-art vacuum systems, pressures as low as 1.00 10-9 Pa are being attained. Calculate the number of molecules in a 1.80-m3 vessel at this pressure and a temperature of 31.0°C.

52. math

Determine the height and radius of cylinder of volume 512 cm3 which has the least total surface area

53. History

Word box : Common Sense, Northwest Territory Ordinance, The American Crisis, Land Ordinance of 1785, Shays Rebellion, Philadelphia Convention of 1787, Virginia Plan, "Give me Liberty or Give me death" 1. Massachusetts farmers rebellion over loss of farms

54. Science

How to find Electron Configuration

55. Algebra 1

Write an equation for then translation of y = IXI

56. physics

A baseball player exert a force of 125 N on a 0.18 kg baseball for 33 sec. what is the baseball change of momentum ?

57. physics

A rigid tank contains 1.80 moles of an ideal gas. Determine the number of moles of gas that must be withdrawn from the tank to lower the pressure of the gas from 21.6 atm to 5.80 atm. Assume the volume of the tank and the temperature of the gas remain

58. physics

Gas is contained in a 6.00-L vessel at a temperature of 15.0°C and a pressure of 6.00 atm. (a) Determine the number of moles of gas in the vessel. (b) How many molecules are in the vessel?

59. algebra

A small fast-food restaurant invests \$4,000 to produce a new food item that will sell for \$4.59. Each item can be produced for \$2.19. (a) How many items must be sold to break even? (Round your answer to the nearest whole number.) items (b) How many items

60. Chemistry

Are there any structural isomers of hydrocarbons from methane to decane have 3 stereogenic C atoms? (i know that there are none for decane itself, but I am wondering about the others before it.) Thanks in advance!

61. Algebra

Let a1,a2,a3..... be an increasing arithmetic sequence of integers. If a4a5=13 what is a3a6?

62. physics

a car sounds its horn as it travels at a steady speed of 15m/s along a straight road between two observers x and y. the observer x heras a frequency of 538 hz while observer y hears a lower frequency. 1 is the car traveling towards x or y 2what would the

63. Algebra

To solve 9x^2-12x+4=49 by using the Square Root Property, you would first rewrite the equation was as A. 9x^2-12x-45=0 B.(3x-2)^2=+/-49 C.(3x-2)^2=7 D.(3x^2)^2=49

64. Algebra

Suppose that |a-b|+|b-c|+|c-d|+.......+|m-n|+|n-o|+............|x-y|+|y-z|+|z-a|=20. What is the maximum possible value of |a-n|?

65. Algebra

The fifth term of an arithmetic sequence is 11. If the difference between two consecutive terms is 1, what is the product of the first two terms?

66. History

Word bank : Lexington and Concord, Saratoga, Yorktown Treaty of Paris 1783, John Paul Jones, Benedict Arnold, Valley Forge, hessians, Boycott, embargo 1. ends American Revolution establishes borders of US Treaty of Paris 2.German mercenaries who fought

67. Math

(2x-1)(3x-7)(4x+3) =6x^2-14x-33x+7 =(6x^2-19x+7)(4x+3) =24x^3+18x^2-126x+28x+21 =24x^3+18x^2-88x+21

68. algebra 2

solve by using quadratic formula x^2+2x-35=0 i got x=10.85 or x=-12.85

69. geometry

1.The perimeter of parallelogram QUAD is 10 more than 5 times AU. If QU =26 cm. find AU 2.If diagonals of a rhombus are 10 cm and 24 cm. find the area and perimeter of the rhombus SOlutions pleaseeeeeee

70. English

1. Most of the money is spent to buy books. 2. Most of the money is used to buy books. 3. Most of the time was spent riding a bike. 4. Most of the water is spoiled. 5. Most of the playground is muddy. 6. Most of the apple was eaten by the kid.

71. program eval

If I were doing an evaluation of an existing after-school program where involvement was voluntary, would I do a quasi-experimental design or experimental design? I'm thinking quasi-experimental as I would randomly select from those who are enrolled in the

72. language arts

how to diagram this sentence...The basketball team with the winning record will advance forwards.

73. math

a vector parallel to the line of intersection of the planes. x-2y-z=6 and 3x-y+z=4 the answer is so first, I took the cross product of and which I think is v. in the equation p0 + tv.

74. science

An experiment is set up to test whether a particular insect prefer a dark or a bright environment. A chamber with a gradient in light intensity from one end (dark) to the other (bright) has been made. The experimental hypothesis is: “There will be a

75. Physics

A cubical object of sides 5 cm is immersed completely in water. What is the force of buoyancy on the object? (Assume g = 10 m/s2)

76. Physics

An object is placed 11 cm in front of a convex mirror of focal length 4 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

77. Physics

An object is placed 4 cm in front of a concave lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

78. chemistry

What is periodicity.

79. History

Word bank : Samuel Adams, Bejamin Franklin, King George III, Thomas Jefferson, Marquis de Lafayette, Baron Frederick von Steuben, Thomas Paine, George Washington 1.ambassador to France in American Revolution author of Albany Plan of Union, delegate to the

80. Algebra

Solve for x>0 in the following arithmetic sequence 1^2,x^2,3^2.....

81. Engineer/robotic

How to tell by an example which is a robot and which is a nobot? My example is: security lights that turns on whenever someone walks by= nobots I need to know how do you know by an example which is which

82. physics

In a student experiment, a constant-volume gas thermometer is calibrated in dry ice (−78.5°C ) and in boiling pentane (36.1°C). The separate pressures are 0.896 atm and 1.433 atm. Hint: Use the linear relationship P = A + BT, where A and B are

83. Math

complete the equation for the linear function whose graph contains the points (2,5) and (3,0) y - ____ = _____(x -2) *fill in the blank - not sure how to do this question cleaning company charges a fee of \$65 in addition to \$10.50 per hour of cleaning.. x

84. physics

Two objects of same material are travelling near you. Object A is a 1.9 kg mass traveling 8 m/s; object B is a 2 kg mass traveling 5 m/s. Which object would make you feel worse if you are hit by it?

85. physics 1

444g mass vibrates according to the equation x = 0.348 sin (5.82 t) where x is in meters and t is in seconds. Determine the total energy. Determine the kinetic energy when x is 14.0cm. Determine the potential energy when x is 14.0cm.

86. algebra

To find the amount A in an account after t years with principal P and an annual interest rate r compounded continuously, you can use the formula

87. foundation of industrial relations

Develop a critique of collective bargaining as a process for determine salaries and wages in nigeria sector

john is walking at such speed so that his kinetic energy is 20 J, what is his speed? It started to rain John runs at a rate of 4.2 m/s find the change in KE.

john is walking at such speed so that his kinetic energy is 20 J, what is his speed? It started to rain John runs at a rate of 4.2 m/s find the change in KE.

90. Physics

A bowling ball slows down at rate of .12 m/s^2. 5 seconds after it starts down the bowling alley its speed is 15 m/s. What was its initial speed?

4x^2+4x+1=16

92. scholarship 7th std

by which of the following digits shoud be * replaced in the number 5*324 so that the number will be divisible by 12 2 or 3 or 4 or 6

93. Physics

An object is placed 4 cm in front of a convex lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

94. English - The Round House

Joe Coutts narrates the The Round House as an adult, but its events take place when he is thirteen. Give one (1) example in The Round House in which Joe comments directly on the distance between his former thirteen-year-old self and the adult who tells the

95. Geometry

By the water cooler in an office, there are conical paper cups. The radius is about 1.2 inches and the height is about 3.5 inches. How much water does the cup hold if it is filled to the top?

96. math

Fourteen and a third cream cakes were eaten for dessert! How many sixths of cream cake is this in total ?

97. biology

I need help finding diagrams of the leaf structure, stem structure and root structure of a lilac flower with explanations. Sites would help

98. math

n^2-4/n^2-2n * n/n^2+10n+16 simplify and state the domain

99. biology

Explain parts of the stem structure in the lilac flower or a flower similar to the lilac flower

101. physics

prove that the moon complete its one revolution around the earth in (27.3) days.distance of moon from the surface of the earth is (380000km).

102. algebra 2

x^2-3x+c = x^2-3x+2.25

103. algebra

If a boy gets 49 questions correct on his test and scores 70%(all the questions are weighed equally), how many questions are on the test?

What is the error and what is the correction? -1/4 / 3/2 = -4/1 x 3/2 = -12/2 = -6

105. geometry

The perimeter of a parallelogram QUAD is 10 more than five times AU.If QU = 26 cm.Find AU.

106. physics

Calculate the mass of the air in a 5 m ✕ 3 m ✕ 2.5 m room, assuming that it is at 1 atm and 19°C.

107. Algebra

The second and ninth terms of an arithmetic sequence are 2 and 30 respectively. What is the fiftieth term.

108. Algebra

Solve the following system of equations using the substitution method:5x-7y=-18 and 4x+3y=20

109. Algebra 1

What does the graph of y = absolute X-2 look like?

110. Algebra 1

What does the graph y = - absolute value of X -4 look like.?

111. Find the probabilty

Find the probability of S^2 3.3 1 6.3 49