1. algebra

how many grams of 2.5% hydrocortisone cream should be mived with 360 g of 0.25 to make a 1% hydrocortisone cream

Suppose that you are in a class of 31 students and it is assumed that approximately 13% of the population is left-handed. (Give your answers correct to three decimal places.) (a) Compute the probability that exactly five students are left-handed. Answer

3. Statistics

Suppose Tori has an unfair coin which lands on Tails with probability 0.28 when flipped. If she flips the coin 10 times, find each of the following: Question 5 options: P(No more than 3 Tails) P(Exactly 1 Tail) P(At least 5 Tails) P(Less than or equal to 2

4. statistics

suppse you received a shipment of nine televisions. four of the television are defective. If two televisions are random;y selected compute the probability at least on of the two televisions does not work

5. Chemistry

Consider the reaction: 2CO(g) + O2(g) equilibrium 2CO2 (g) Write the equilibrium expression for this reaction. Keq = ?? Addition of a catalyst to this reaction would have what effect on the equilbrium? Addition of a catalyst to this reaction would have

6. Statistics

The probability that a randomly selected individual in a certain community has made an online purchase is 0.45. Suppose that a sample of 10 people from the community is selected, what is the probability that at most 3 of them has made an online purchase?

7. Statistics

The probability that a student uses the Academic Resource Center on a regular basis is 0.26. In a group of 18 students, what is the probability that exactly 8 of them use the Academic Resource Center on a regular basis? Round your answer to 2 decimal

8. Physics

A pinhole camera has a small circular aperture of diameter D. Light from distant objects passes through the aperture into an otherwise dark box, falling on a screen at the other end of the box. The aperture in a pinhole camera has diameter D = 0.600 mm.

9. chemistry

The structure of 2 - chlorobutane is shown below. a) which newman projection below represents the lowest energy state of butane? b)which newman projection below represents the highest energy state of butane?

10. math check

21% of a certain breed of rabbits are born with long hair. What is the probability that in a litter of 12 rabbits, exactly 2 will have long hair? (Give your answer correct to three decimal places.) 1=.21=.79 0.79^12=0.05909 2-0.0591=1.94

11. Math question

In an arithmetic series, the 15th term is 43 and the sum of the first 15 terms is 120. Add the first 20 terms of the series.

12. Math check

The number of ships to arrive at a harbor on any given day is a random variable represented by x. The probability distribution of x is as follows. (Give your answers correct to two decimal places.) x 10 11 12 13 14 P(x) 0.37 0.09 0.05 0.14 0.35 (a) Find

13. Math

Can I please get some help on these questions: 1. How many solutions does the equation,2sin^2 2 θ = sin2θ have on the interval [0, 2pi]? 4? ...what about 4cos2θ = 8cos^2 2θ? 2. True or False: sin^2 4x = 1 has 8 solutions on the interval [0, 2pi]?

14. physics

on turning a corner a motorcyclist rushing at 44 m/s. finds a child on the road 100 m away. he applies the brake so as he stops the motorcycle within 1m of the child. calculate the time required to stop?

15. Statistics

In an elementary school, 25% of children wear glasses. Suppose that a random sample of 64 children is selected. Find the mean number of children in the sample who wear glasses. Round your answer to the nearest integer.

16. Statistics

In an elementary school, 25% of children wear glasses. Suppose that a random sample of 64 children is selected. Find the mean number of children in the sample who wear glasses. Round your answer to the nearest integer.

17. Chemistry

I just wanted to see if my answers made sense. 1. What effect would each of the following have on your calculated value of Kf (too high, too low, or no effect)? In each case explain your answer. a) There was a small bubble in the thermometer, causing all

18. Statistics

In an elementary school, 25% of children wear glasses. Suppose that a random sample of 64 children is selected. Find the mean number of children in the sample who wear glasses. Round your answer to the nearest integer.

19. Chemistry - %v/v

1. How many mL of acetone are needed to prepare a 10% v/v solution in 500 mL of methanol? 2. If a 500mL solution of n-propanol in water is prepared with 4mL of alcohol, what is the concentration of alcohol in % v/v? I've never worked with %v/v before so

20. Statistics

In an elementary school, 25% of children wear glasses. Suppose that a random sample of 64 children is selected. Find the mean number of children in the sample who wear glasses. Round your answer to the nearest integer.

21. Statistics

In the library on a university campus, there is a sign in the elevator that indicates a limit of 16 people. in addition there is a weight limit of 2500 lbs. assume that the average weight of students, faculty, and staff on campus is 150 lbs, that the

22. Calculus - HELP plz!

Find all of the first partial derivatives of f(x,y,z)=arctan y/xz

23. Statistics

Air America has a policy of booking as many as 15 persons on an airplane that can seat only 14. (Past studies have revealed that only 86% of the booked passengers actually arrive for the flight.) Find the probability that if Air America books 15 persons,

24. Statistics

Air America has a policy of booking as many as 15 persons on an airplane that can seat only 14. (Past studies have revealed that only 86% of the booked passengers actually arrive for the flight.) Find the probability that if Air America books 15 persons,

25. statistics

Give examples of nominal, ordinal, interval. and ratio data. Then, convert your ratio data example into interval, ordinal, and nominal scales. Measurement Scales Practice 1. Indicate the first letter (N, O, I, R) of the highest possible scale for each of

26. Physics

1- A 5.0 kg block moving east with speed of 6 m/s collides head on with another 8.0 kg block moving west with speed of 4 m/s. After the collision the 5.0 kg block was moving west with speed of 5 m/s while the 8.0 kg block was moving east. a) What is the

27. Difracction problem

Diffraction from an unknown cubic metal is observed to occur at the following values of θ when using CuKα radiation. Determine the crystal structure to find the lattice constant. 20.1⁰, 29.2⁰, 36.6⁰, 43.5⁰, 50.2⁰, 57.4⁰, 65.5⁰ a) What is

28. chemistry

what is the percentage of alcohol in a misture containing 1500 mo of witch hazel (14% alcohlol), 2000 ml of glycerin, and 5000 mls of 50% alcohol?

29. Chemistry

1. What molarity is needed so that 5mL diluted to 475 mL will yield 0.1M? For this one I used M1V1=M2V2 and got 9.5M just checking to see if I did that right. 2. How much 2.5 HNO3 can be made from 7.0mL of a 16.0M HNO3 soltuion? I tried using M1V1=M2V2 for

30. LIfe orientation

Identify one environmental or human factor that causes ill health or accidents in South Africa.discuss 5 ways in which the human or environmental problem impacts on the community.recommendations on how to address the human or environmental factor.name two

31. finance

What are the two most popular personal retirement plans? A. Keogh account and Social Security B. Social Security and Roth IRA Plus C. Keogh accounts and individual retirement accounts D. 401(k) and Social Security

32. Statistics

In an elementary school, 25% of children wear glasses. Suppose that a random sample of 64 children is selected. Find the mean number of children in the sample who wear glasses. Round your answer to the nearest integer.

33. CENCEPTS IN HEALTHCARE

what is the procedures and resources available for assisting patients who use English as a second language, who is hearing impaired, sight impaired, or who have any other type of physical or diversity related disposition that should be addressed to provide

34. Physics

2-A 10.0 Kg block is released from point A in the figure below. The block travels along a smooth frictionless track except for the rough 1 m long portion between points B and C. It makes a collision with stationary 10 kg ball after passing point C. The

35. Math

Joe weighs 30 lbs less than twice ken's weight. If ken gains 10 pounds then together they would weigh 250 pounds. How much does each of them weigh? let x be ken's weight. my work: 2x - 30 = j x+ 10 + J = 250 and now im stuck, can someone show me how to

36. CALCULUS

Find the gradient and directional derivative of f at P in the direction of v: f(x,y)=ln(x^2 + y^2 +1)+ e^(2xy) P(0,2) v=5i-12j

37. Chemistry

a) A pressure vessel contains a large volume of CO2 gas at 10 atm pressure. A membrane composed of a poly(ether ketone) polymer with thickness 100 microns and net effective area of 100 cm2 covers a small perforated port in the container. The solubility of

38. Research

To make causal inferences from observed differences between groups based on varied levels of treatment, it is necessary to…?

39. physics

When a wire of length 5m and radius 0.5mm is stretched by a load of 49N,the elongation produced in wire is 0.1cm. Find the energh stored per unit volume of the wire.

40. chemistry

A 50g sample of ammonium dichromate is decomposed, what is the milliliter volume of nitrogen gas released at STP?

41. Math

Jon bought a car for 20000 and sold it for 30% profit. Then he bought another more expensive car and sold it for 30% loss. Wat was his overall profit or loss? I got 1st 26000 profit Then 18200 loss Overall? I minus them or??

42. Chemistry

a) A pressure vessel contains a large volume of CO2 gas at 10 atm pressure. A membrane composed of a poly(ether ketone) polymer with thickness 100 microns and net effective area of 100 cm2 covers a small perforated port in the container. The solubility of

43. Chemistry

How many grams of calcium carbonate are required to prepare for 50.0 grams of calcium oxide

44. Spanish

Tu amigo insiste en preguntarte de quiénes son las cosas. Tú le contestas de forma muy enfática. 1.¿De quién es este sombrero? / tú 2.¿De quiénes son estos cinturones? / Tomás y Ricardo 3.¿De quiénes son estos zapatos? / Uds. 4.¿De quién son

45. marketing

1.How would you classify Wal-Mart in terms of position on the wheel of retailing versus that of an off-price retailer?

46. physics

A tunable capacitor (with variable capacitance) is charged by a U0=12 V battery and then is connected in parallel to a R=3 Ω resistor. The capacitance C(t) of the capacitor is controlled so that the current in the circuit remains constant at all times.

47. chemistry

the N-N bond energy is difficult to measure. . determine the maximum de broglie wavelength of electron breaking the N-N bond

48. Chemistry

A solution contains 80.0 g of sodium chloride and 400.0 g of water. Calculate the NaCl as a mass percentage

49. physics

A ball is released from a tower at a height of 100 meters toward the roof of another tower that is 25 meters high. The horizontal distance between the two towers is 20 meters. With what horizontal velocity should the ball be imparted so that it lands on

50. Statistics

Individuals who have a certain gene have a 0.50 probability of contracting a certain disease. Suppose that 1,940 individuals with the gene participate in a lifetime study. What is the standard deviation of the number of people who eventually contract the

51. chemistry

You will be presented with three crystallographic directions drawn in a unit cell. Please write the identity of the direction in the space provided below each picture. Use the correct form of brackets for describing a direction, and leave no spaces between

52. STATISTICS

(a) With n=12 and p =0.4 find the binomial probability that p(9) by using a binomial probability table. (b) np ¡Ý5, nq¡Ü5, also estimate the indicated probability by using the normal distribution as an approximation to the binomial, is np < 5 or nq < 5

I posted this before can someone please check my answers and help me thanks:) 2 rectangles have equal areas determine the area of each rectangle then use this info to determine the perimeter. rectangle one: length of 2p + 3 width of 3.8 after my work i got

54. math

a particle moves along the x-axis so that its velocity is proportional to x^2. Prove that its acceleration is proportional to x^3

55. UK Taxation

OPPA is the controlling shareholder and managing director of GANGNAM Ltd, un unquoted trading company that provides support services to the oil industry OPPA disposed of the following assets during the tax year 2009-10 1. On 8 April 2009 OPPA sold five

56. Science

the probability of having blood group B is 0.08. what is the probability that if one pints of blood is taken from each of 100 unrelated blood donors fewer than three pints of group B blood will be obtained?

57. pre-calculus

Move point (3,50 degrees) according to the following symmetries (keep positive) a. symmetrical to the origin b. symmetrical to theta=0 degrees c. symmetrical to theta= 90 degrees

58. algebra

the perimeter of a rectangle is 26yd, and the area of the rectangle is 36yd^2. What are the dimensions of the rectangle?

59. pre-calculus

equation for parabola with focus (8,-2) directrix x=4

60. Math

For how many ordered triples of positive real numbers (a,b,c), do the equations ax^2+2bx+c, bx^2+2cx+a and cx^2+2ax+b each have 2 distinct real roots?

61. Math

Suppose x and y are real numbers satisfying x(x+i)+y(y+i)−6(8+i)=0. What is the value of x^3+y^3?

62. Physics

At sea level and 303 k, a rubber balloon is inflated with hydrogen gas to a diameter of 3.00 ft and an internal pressure of 16.7 lb/in scuared. Find the diameter of the balloon at an altitude of 30000 ft where the internal pressure is 6.4lb/in scuared and

63. physics

A generator has a terminal voltage of 102V when it delivers 10.3 A, and 92 V when it delivers 31.9 A. Calculate the emf. Answer in units of V

64. chemistry

Calculate the surface energy of the (100) plane of niobium. The heat of atomization is 745 kJ/mol. Express your answer in J/cm2.

65. algebra 2

the number of milligrams of a drug that remains in a patient's system after t hours is given by the function a(t)=ie^rt. jordan was given 500 milligrams of medicine which leaves his bloodstream at a rate of 25%. how much of the medicine remains in his

66. SAT math

Can someone please help me with this question: Write an equation that describes the following variation statement, and then find the constant of proportionality k . z is inversely proportional to x and directly proportional to y ; z = -10 when x = 5 and y

67. Statistics

You are a real estate agent and you are trying to predict home prices for your clients that want to list their house for sale. You have a very small city without much data. You will need to use the data that you have available for the past year on homes

2 rectangles have equal areas determine the area of each rectangle then use this info to determine the perimeter. rectangle one: length of 2p + 3 width of 3.8 after my work i got p= 1.5 so the area is 14.4 and the perimeter is 19.6 is it correct? rectangle

69. math

Want to hang a painting on a wall that is 17and 5/8 inches high and I want 2 inches left on top and bottom of painting showing. Where would I hang it at?

70. check math

If x is a binomial random variable, calculate the probability of x for each case. n=4, x=1, p=0.3 answer 0.4116

71. physics

a person stands in the center of a frozen pond wearing ice skates. his total weight including his skates is 400 n. he pushes on of his 20 n skates forward at 10 m/s. what is his velocity?

72. math check

Find the area under the standard normal curve between -1.32 and the mean, P(-1.32 < z < 0.00). (Give your answer correct to four decimal places.) 0.0968

1. These two technological advancements of the Industrial Revolution helped lead to the development of Impressionism. the railroads and the printing press the railroads and photography photography and electric lighting** the automobile and electric

74. Corporate Finance

A firm has a long-term debt-equity ratio of 0.5. Shareholders’ equity is \$1.07 million. Current assets are \$256,500, and the current ratio is 1.9. The only current liabilities are notes payable. What is the total debt ratio? (Round your answer to 2

75. algebra

The perimeter of a rectangle is 94 ft, and the area of the rectangle is 90ft ^2. What are the dimensions of the rectangle?

76. pre-calculus

Josh fires a catapult 18 ft above the ground with an initial velocity of 25 ft/sec. The misslie leaves the catapult at an angle of degree theta with the hoizontal and heads toward a 40 ft wall 500 ft from the launch site. If the missle is fired at a 20

77. pre-calculus

Convert the following parametic equation into a polar equation: x=t y=(2t-4)/3

78. chemistry

the surface energy of plane of niobium.the heat of atomization is 745 kj/mol

79. algebra

a rectangle with an area of 45 square units has a length that is one less then half the width which expression represents the length of the rectangle?

80. chemistry

diffraction from an unknown cubic metal is obeserved to occur at the following values .

81. chemistry

you will be presented with three crystallographic direction drawn in a unit cell.

82. algebra2

divide 4x^3+2x^2+3x+4by x+4

83. Math

Find an equation for the line that contains the points (2, -3) and (6, 9).

84. Math

Given that the quadratic polynomial f(x)=3x^2+ax+b has real coefficients and f(x)=0 has a complex root 8+5i, what is the value of a+b?

85. Math

The remainder that the polynomial f(x) leaves upon division by x−1 and x−2 is 2 and 3, respectively. If the remainder f(x) leaves upon division by x^2−3x+2 is g(x), what is the remainder g(x) leaves upon division by x−11?

86. algebra

solve for x 2x+4=3x=1/3

87. Poetry, Part 2

One difference between English sonnet and the Italian sonnet is its

88. Statistics

In the library on a university campus, there is a sign in the elevator that indicates a limit of 16 people. in addition there is a weight limit of 2500 lbs. assume that the average weight of students, faculty, and staff on campus is 150 lbs, that the

89. Algebra

Identify the solution(s) of the system of equations, if any. -6x - 4y = 24 8y = -12x - 48

90. chemistry

A comparison of density values obtained by X-ray diffraction reveals that the percentages of vacant sites in aluminum (Al) are 0.0700% at 923 K and 0.0090% at 757 K. Given this data, determine the number of vacant sites per cm3 at 550 K. Express your

91. human life

in 10-15 lines five recommendations on how to overcome the practise of high-risk sexual behaviour amongst the adolescence

92. physics

46. Balance these equations: (a) ____Fe(s) + ____O2(g)h____ Fe2O3(s) (b) ____H2(g) + ____N2(g)h____NH3(g) (c) ____Cl2(g) + ____KBr(aq)h____Br2(l ) + ____KCl (aq) (d) ____CH4(g) + ____O2(g)h____CO2(g) + ____H2O(l )

93. chemistry

What is the approximate ratio in conductivity of silicon doped with 37 ppm to silicon doped with 5 ppm

94. chemistr

A comparison of density values obtained by X-ray diffraction reveals that the percentages of vacant sites in aluminum (Al) are 0.0700% at 923 K and 0.0090% at 757 K. Given this data, determine the number of vacant sites per cm3 at 550 K. Express your

95. Science

You launch a model rocket up into the sky. Right after launch the rocket is accelerating upwards at 10 m/s2. What is the magnitude of the net force in Newtons on the rocket if the rocket has a mass of 0.1 kg?

96. English 225

Which of the following is true of the screenwriter’s role in making movies? (Points : 1) A film begins with a writer’s story Film is generally considered a writer’s medium The writer is more important than the rest of the cast and crew Writing

97. Chemistry

How many meters underwater is 3.128 atm?

98. chemistry

Help for that 1) N-N bond question and 2)for (100) niobium and 3)crystallographic direction .

99. Calculus

Find the equation of the tangent plane and symmetric equation for the normal line to the given surface at P: xy^2 + zy^2 + 4y -xz^2 = 18 P(-2,0,3)

100. chemistry

How many liters of 20 Volume H2O2 will contain one mole of hydrogen peroxide?

101. SAT math

Can someone please double check my true and false answers! 1. All cylinders are prisms: TRUE 2. The angle opposite a side length of 6 cm in a triangle is larger than an angle opposite a side length of 7 cm in the same triangle: FALSE 3. The perpendicular

102. spanish II

Has anyone taken Spanish 2 in summer school from apex? What was it like?

103. obang secondary

recommendations on how to address hiv/aids?

104. life orientation

provide recommendations on how to address Hiv/aids

105. sd

Let A0=(−1,0), and let O be the origin (0,0). For each integer i≥1, we construct the point Ai so that |Ai−1Ai|=|Ai−1O| and the angle ∠OAi−1Ai is a right angle. If O,Ai−1,Ai+1 are not collinear for any value of i, what is the x-coordinate of

106. CRT/205

I have to identify the rhetorical devices in this article race, class, and real estate by Sheryll D. Cashin august (2004)

107. Math

Foremost Fish Market pays a straight commission of 18% on gross sales, divided equally among the three employees working the counter. If Foremost sold \$22,350 in seafood last week, how much was each counter employee’s total gross pay from this?

108. chemistry

The structure of C12E5 is given below. what type of surfactant is it? Will CMC of C12E5 be smaller or larger than SDS? Rank the following solutions in order of increasing capability to dissolve oil. options are 9*10^-5M C12E5 , 6*10^-5M C12E5 , 3*10^-5M

109. physics

a person stands in the center of a frozen pond wearing ice skates. his total weight including his skates is 400 n. he pushes on of his 20 n skates forward at 10 m/s. what is his velocity?

110. chemistry

a pressure vessel contain a large volume of co2

111. chemistry

A p-n junction is to be created by diffusing boron into an n-type silicon wafer with an existing carrier conc.

112. chemistry

our wafer will be doped with phosphorus to a conc. at which the material exhibits extrinsic behaviour.

113. Chemistry

For each pair of structures shown below, indicate whether the two species are identical molecules, enantiomers, or isomers of some other sort.

114. chemistry

the silicon wafer is coated with a layer of metallic aluminium which acts as an electrical contact.

115. chemistry

calculate the initial rate of reaction when a reactor is charged with so2cl2 at conc. of 0.22 mol/l.

116. Life orientation

In 10-15 lines critically discuss 5 ways in which the human or environmental problem impacts on the community about teenage pregnancy

117. chemistry

the silicon wafer is coated with a layer of metallic aluminium which acts as a electric contact.

118. Math

If z is a non-real complex number and z^2−26z is a real number, what is the value of z+z¯? z¯ denotes the conjugate of the complex number z.

119. Math

1+(2/i)+(3/i^2)+(4/i^3)+⋯+(n/i^(n−1))=29+28i what is the value of n? n is positive value

120. Math

Given that a and b are real numbers such that the follwoing quadratic equation x^2+(a+6i)x+b+12i=0 has a repeated root, what is the value of a−b?

121. physics

In the movie Spiderman 2, there's a famous minute long scene where Spiderman stops a train. If the initial speed of a five car out of control subway train was around the top speed of the NYC subway (27 m/s), and Spiderman stopped the train in exactly one

What is the role of stoke exchange in kenya ?

123. Algebra

Identify the solution(s) of the system of equations, if any. x+5y=5 2x-15y=0

124. Statistics

Assume that in a binomial experiment that n = 12, p = 0.28, and x = 4. Use the binompdf command in the TI-84 calculator to find the probability. Round your answer to 2 decimal places.

125. chemistry

Help for problem 16 germanium graph. help me out plz..what to write in those boxes.

126. physics

a balloon is rising up with acceleration of 25m per hour second square a body is dropped from the balloon when its upward velocity is 300m/s what are the values of velocity and the acceleration of the body at the instant it is dropped ?

127. economics

what are the costs and conquences of providing subsidies and welfare

128. Statistics

Calculate the residuals using the following info: number of people:12,14,15,18,20,16,14,13,18,19,20,22 and cost of drinks:24,30,36,38,65,44,36,30,39,76,80,85

129. Chemistry

How is strength different from concentration for acids and bases? please give an example.

130. math

given the demand equation 8x + p - 46 = 0 and the supply equation 7x - p + 18 = 0, where p is the unit price in dollars and x represents the quantity demanded in units of a thousand, determine the equilibrium quantity and equilibrium price.

131. Algebra 2

What is the result when you decompose 2x^2-19x+50/(x+3)(x-2)^2 into partial fractions? To clarify, the entire first line is over the entire second line

132. Financial Accounting

Which account(s) must be analyzed to determine the proceeds from the sale of a building? How is this cash flow classified?

133. Math

3√(11x^3y)÷-2√(12x^4y)

134. Calculus

Find the equation of the tangent plane and symmetric equation for the normal line to the given surface at P: xy^2 + zy^2 + 4y -xz^2 = 18 P(-2,0,3)

135. fisica

ayudenme con esta tarea por favor PRIMARY RAINBOW: Combine φ=4r−2i with Snell's Law to express the angle φ as a function of i and n only. (a) Evaluate φ(i,n) for the following values (give your answers in degrees): a.1) i=3∘, n=1.35 a.2) i=46∘,