Questions Asked on
August 7, 2010

  1. physis

    The range of human hearing is roughly from twenty hertz to twenty kilohertz. Based on these limits and a value of 343 m/s for the speed of sound, what are the lengths of the longest and shortest pipes (open at both ends and producing sound at their

    asked by Anonymous
  2. college chemistry

    When solutions of AgNO3 and NaOH react, the balanced molecular equation is 2AgNO3(aq) + 2NaOH(aq) Ag2O(s) + 2NaNO3(aq) + H2O(l) How much Ag2O is produced when 0.200 g of AgNO3 and 0.200 g of NaOH react?

    asked by michelle
  3. math

    The amount of corn chips dispensed into a 12-ounce bag by the dispensing machine has been identified as possessing a normal distrubution with a mean of 12.5 ounces and a standard deviation of 0.2 ounces. What porportion of the 12 ounce bags contain more

    asked by Jeannie
  4. chemistry

    how many grams of 5%NaNO3 will be required to prepare 250ml solution

    asked by amruta
  5. science

    a 5.o kg book is sitting on a table. which describes the forces acting on the book? a)there are no forces acting on the book b)the net force on the book is zero Since the weight of the book is cancelled out by the support of the table. does that mean a)

    asked by nancy
  6. US History

    In the Watergate Scandal, I know that 5 men broke into the Democratic National Committee headquarters and Nixon did not want to give up the tapes that revealed that he wanted to cover up the break in... why? 1) Did Nixon put up the tape recording system in

    asked by Amy~
  7. math

    In a quadrilateral ABCD, the diagonal AC bisects angle BAD and AB = BC = CD. Prove that the other diagonal, BD, bisects angle ADC.

    asked by mathsen
  8. Chemistry

    which of the following equations is the one represented by this experiment? Justify your answer by comparing the moles of iron consumed(Fe 0.139/0.0419= 3.32) and the moles of copper produced(Cu 0.0419/ 0.0419 =1) to the coefficients in the equation of

    asked by Ashley
  9. organic chemistry

    which of the 3 solvent would not be suitable recrystallization solvent for acetanilide? Why? - water as recrytallization solvent for acetanilide - chloroform as recrystallization solvent for acxetanilide - methanol as recrystallization solvent for

    asked by Janine Faeldonia
  10. math

    In a pentagon ABCDE, AB = AE, BC = ED and BD = EC. Prove that AC = AD.

    asked by mathsen
  11. Microeconomics

    A sporting goods store has estimated the demand curve for a popular brand of running shoes as a function of price. Use the diagram to answer the questions that follow. a. Calculate demand elasticity using the midpoint formula between points A and B,

    asked by Monica
  12. biology

    What is the source of energy driving the hydrolic cycle? a. evaporation of the ocean water b. heat conducted from the earth's core to the surface c. radiant heat from the sun d. air currents returning to the earth's surface I chose a) evaporation of the

    asked by nancy
  13. math

    Let ABC be a triangle such that angle ACB = 135 degrees. Prove that AB^2 = AC^2 + BC^2 + ¡Ì2 x AC x BC.

    asked by mathsen
  14. math

    Simplify sin(theta)* sec^2(90-theta)

    asked by Seven
  15. Physics

    A uniform solid sphere of mass 4kg and diameter 20cm initally at rest, begins to roll without slipping under the influece of gravity, down an incline that makes an angle of 15degrees to the horizontal 1 calculate the angular acceleration of the sphere 2

    asked by Dermot
  16. Statistics

    a random sample of 10 minature tootsie rolls was taken from a bag. Each piece was weighed on a very accurate scale. The results in grams were 3.087, 3.131,3.241,3.270,3.353,3.400,3.411,3.437,3.477 a.) construct a 90 percent confidence intervalfor the true

    asked by BabyGirl
  17. medicine

    What is the main difference between a stem cell and a cancer cell? A. A stem cell grows at a faster rate than a cancer cell B. A stem cell obeys signals to stop growth, but a cancer cell doesn't C. A stem cell is usually external; a cancer cell is usually

    asked by Beth
  18. Math

    a roof rises 1.9 feet vertically and 9.1 feet horizonally. what is the grade of the roof?

    asked by Norma
  19. math

    a solid alumimium casting for a pulley consists of the discs each 1 1/2 cm thick of diameters 4 cm, 6 cm,and 8 cm.a central hole 2 cm in diameter is drilled out .if the density of the alumimium is 2.8g/cm^3,calculate the mass of the casting

    asked by kolapo
  20. elementary math

    A student has a penny, nickel, dime, and quarter distributed two coins apiece to his front two pants pockets. What is the probability that the front right pocket has more than 30¢ in it?

    asked by jojo
  21. math 30 applied

    A small aircraft leaves Calgary on a heading of E30deg S (30 degrees south of east) travelling 200 km/h. it is affected by a 40 km/h wind blowing toward S60deg W (60 degrees west of south). After one hour the plane’s position relative to Calgary will be?

    asked by jim bean
  22. CHEM 1B

    Carboxylic acids are stronger acids than alcohols A. This is because the carboxy anion is delocalised. B. This is because the hydrogen atom is delocalised. C. The O-H bond in carboxylic acids is very strong. D. This statement is not true One characteristic

    asked by Lucinda
  23. english

    briefly summarize the four stages of the transformational learning cycle

    asked by sharon
  24. Popular American Culture

    Prepare a 350 to 700-word paper in which you examine trends in popular American culture. In your examination, be sure to describe at least one trend from the following areas: a. Social b. Political c. Personal d. Religious

    asked by Tanya
  25. Inverse Functions & Trig. Equations

    7. Evaluate sin[sin^-1(-1/2)]. a. 1/2 b. ð /6 c. -1/2 d. - ð /6 8. Evaluate cos[tan^-1(5/12)]. a. 12/13 b. 12/5 c. 5/12 d. 5/13 9. Evaluate cos[sin^-1(-3/5)]. a. -4/5 b. 5/4 c. 4/5 d. -3/4

    asked by Claire
  26. Algebra

    Five-Sixths of a number is -60. What is the number?

    asked by Me
  27. math

    Find the exact value of sin(cos^-1(-1/3))

    asked by Seven
  28. math

    Solve 2 + cos^2(theta)=3sin^2(theta) for 0=< theta < 360

    asked by Seven
  29. algebra

    Hockey teams receive 2 points when they win and 1 point when they tie. One season, a team won a championship with 61 points. They won 11 more games than they tied. How many wins and how many ties did the team have?

    asked by Jackie
  30. algebra

    Soybean meal is 16% protein: cornmeal is 8% protein. How many pounds of each should be mixed together in order to get 320-lb. mixture that is 14% protein?

    asked by Jackie
  31. MTH233/statistics UOP

    You work for the public relations department of the Social Security Administration. In an effort to design better advertising campaigns, your department decides to conduct a survey to find out the opinions people in the United States have about the Social

    asked by sue
  32. math

    P (-1.3 less than or equal to Z less than or equal 0) P (-1.3 ¡Ü Z ¡Ü 0)

    asked by donna
  33. science

    a certain's plant root contain higher concentrations of nitrate than the soil that surrounds them. Which mechanism explains the movement of nitrates form the soil into the plant's roots? a)osmosis b)facilitated diffusion c)active transport d)filtration I

    asked by nancy
  34. English 30-1

    Hi there, i am writing an analytical essay for William Shakespeare's "Hamlet". My essay topic is this.... In Hamlet, Shakespeare reveals the effect of conflict on a person’s character. Write an essay demonstrating how Shakespeare uses a character's

    asked by Danielle
  35. english

    choose two age groups from different periods in to th the physical development process

    asked by sam
  36. algebra, adding rational expressions

    2/zy^2+7/z^2y

    asked by Armelia
  37. medicine

    A patient was admitted in an alternating state of mania and despair. What diagnosis does this statement describe? A. Obsessive-compulsive disorder B. Bipolar disorder C. Posttraumatic stress disorder D. Anxiety I'm not sure if it's B or D

    asked by Beth
  38. Statistics

    Here are heart rates for a sample of 30 students before and after a class break. At á = .05, was there a significant difference in the mean heart rate? Heart Rate Before and After Class Break (a) State the hypotheses. (b) State the decision rule and

    asked by Cindy
  39. organic chemistry

    account the difference in the crystals formed through rapid and slow crystallization.

    asked by Janine Faeldonia
  40. Algebra

    I am working on Factoring the Trinomial and need help to solve this equation: t=3t^3+22t^2+8t

    asked by Joyce
  41. asessment

    a very young child takes off his socks. the caregiver puts it back on, the child takes it off again repeating it. child is engaged in play (d) (a)functional b. constructive c, rule-based d. dramatic 2. which of the foll. is best suited to a formative

    asked by action
  42. math

    Factor: x^8 + 2x^4 y^4 + 9y^8

    asked by cosca
  43. math

    Let P and Q be the points on the sides AB and BC of a triangle ABC respectively such that BP = 3PA and QC = 2BQ. Let K be the midpoint of the segment PQ. Prove that the area of the triangle AKC is equal to 11S/24, where S is the area of the triangle ABC.

    asked by mathsen
  44. elementary math

    How many different ways can a committee of 9 be selected from a larger organization of 20 people?

    asked by jojo
  45. Statistics

    Thomas economic forecasting, Inc. and Harmon econometrics have the same mean error in forecasting the stock market over the last ten years. However, the standard deviation for Thomas is 30 points and 60 points for harmon.At the .05 signifcance level can we

    asked by Anonymous
  46. algebra

    Determine whether the given numbers are a soluation of the inquality. 3,-12,-17,-1 y - 9 > 2y - 4

    asked by Jackie
  47. Chemistry

    Which of the following has the higher ionization energy and why: Li or Ba? I cannot figure this out because they are in different periods but Ba is down on the periodic table telling me that it may have a higher ionization than Li. Help please?

    asked by Ashley
  48. MATH

    Could someone please show me how to solve this Prove tan(-theta) = -tan(theta)

    asked by Please Answer
  49. Math

    I factored 3.6x^6+2x^6-2.8x^2+3.2x as; 3.6x^7+2x^6-2.8x^2+3.2x However my answer is incorrect. The correct answer should be; 0.4x(9x^6+5x^5-7x+8) How do I get to the correct answer? So that I am able to do similar problems, because every problem that I

    asked by Lynn
  50. algebra

    what is the solution set to 5x+7=22

    asked by Anonymous
  51. medicine

    A patient has unrealistic thoughts and behaviors despite an awareness that they're inappropriate. She's experiencing A. Phobia B. paraphilia C. panic attack D. obsessive-compulsive disorder I think it's D

    asked by Beth
  52. Math

    solve the system: y^2=1-x^2 y^2=x^2-3x+2

    asked by PLEASE ANSWER THIS !!!
  53. algebra

    I am a manager at a hospital i have 1,176 hours in a week to be covered by my staff. How many 40 hour people would I need and how many 32 hour people would I need to cover the hours.

    asked by Joyce
  54. psych

    Can you tell me if I have this right? Are the major schools of psych? Structuralism, Behaviorism, Functionalism, Psychoanlysis, and Humanism? Just want to make sure I have the right ones. Thank you

    asked by diana
  55. math

    expand (1-x^2)^6 ?

    asked by Stace
  56. math

    2/3/10=1.8/r

    asked by michelle
  57. English

    In the New Testament, what word is used to identify letters the disciples sent to each other?

    asked by Linda
  58. stats

    Compute the following and show your steps 7! /5!.

    asked by renae
  59. Math

    Could someone please show me how to solve this Prove tan(-è) = -tanè

    asked by Seven
  60. math

    Could someone please help me answer this Prove tan(-theta) = -tan(theta)

    asked by Seven
  61. math

    how many solutions does the equation -2cosX = sqaureroot(X) have?

    asked by Seven
  62. math

    rewrite the statement using percent notation out of every100 eligible people 87 voted in a recent election

    asked by michelle
  63. algebra

    Solve by elimenation 0.3x -0.27 =4 0.2x + 0.3y = -37/17

    asked by Jackie
  64. algebra

    Write interval notation for the set {x|-4 < x < 4 -

    asked by Jackie
  65. KIDNEY!!

    The size of loop of Henle in every person is same ???

    asked by Mesut
  66. math

    P(Z greater than 2.5)

    asked by donna
  67. math

    Gasoline is 2.79 a gallon, if you use 2 3/4 gallons a day driving to and from work, how much should you budget for 20 days? Now, would I multiply? $2.79 x 2.75 then multiply that number by 20 days?

    asked by Keirra
  68. US History

    In Richard Nixon v. Supreme Court are the main characters only Nixon and the Supreme Court?

    asked by Amy~
  69. gemorty

    what supplementry means

    asked by danyle
  70. nursing

    What type of information appears in a histology report? A. Tissue structure B. Synechia C. Blood type D. Bone health I think it's C but at this point i'm guessing. I really need help!

    asked by Mel
  71. health

    Who in the organization should be involved in performance improvement projects and why?

    asked by cortez
  72. Math

    4 3 1 1 2 1 -2 -3 What's the pattern and the next numbers of this sequence?

    asked by Thales
  73. nursing

    A patient had a cystectomy. What does the root of this word mean? A. Kidney B. Tube C. Bladder D. Meatus I chose C A pyelogram was performed on a 43-year-old patient. The root word means A. trough, basin, pelvis B. ureter, urethra C. bladder, urine D.

    asked by Mel
  74. medical terminology

    A patient is diagnosed with Addison's disease, which is caused by decreased functioning of the adrenal cortex. Which of the following medications may be prescribed? A. Glucotrol B. Humulin C. Solu-Cortef D. Pitressin My answer is C (i think)

    asked by Nicole
  75. system design

    which of the following is on of the four fundamental issues IS managers must address. 1. IS Specialist salaries, career preparation, infrastructure or an organization. I think it is either Infrasture or an Organizations mission

    asked by yog
  76. US History

    There was this website that said that one of the conflict of Roosevelt v Supreme Court was NRA. Would NRA be the National Recovery Act? I think it is since it is related to the Roosevelt and the Supreme Court based on the websites that I searched. Just to

    asked by Amy~
  77. organic chemistry

    describe the crystals formed through slow crystallization

    asked by Janine Faeldonia
  78. organic chemistry

    what type of impurity is associated with large crystals? Explain.

    asked by Janine Faeldonia
  79. Chemistry

    what is the final temp of the combination when 50 grams of chromium at 15 degrees celcius is added to 25 milliliters of water at 45 degrees celcius?

    asked by Nick
  80. math

    Solve x = y^3 - 4 for y in terms of x

    asked by CaN yOu AnsWeR tHis
  81. math

    Thank You for taking the time to look at this. If x = 2cos^2(theta) and y = sin2(theta), show that (x -1)^2 + y^2=1

    asked by CaN yOu AnsWeR tHis
  82. Math 157

    I am having some trouble figuring out these two problems. 1. Calculate the mean, median, mode, range, and midrange for the data set given {-1, 7, 0, 14, -2, -15, 0, 8, 7} Mean=2 Median=7 Mode=0, and 7 Range= Midrange= 2. Calculate the mean, range,

    asked by Rayna
  83. psy/220

    explan how you believe and individuals attachment style can affect the types of love relationships he or she has.

    asked by hogie
  84. math

    Factor: a^4 + b^4 + c^2 - 2(a^2 b^2 + a^2 c + b^2 c)

    asked by cosca
  85. math

    Prove that: 20^22 - 17^22 + 4^33 - 1 is divisible by 174.

    asked by mathsen
  86. math

    Prove that if p, q, r and s are odd integers, then the equation x^10 + p x^9 - q x^7 + r x^4 - s = 0 has no integer roots.

    asked by mathsen
  87. math

    For which real values of b do the equations x^3 + b x^2 + 2bx - 1 = 0 and x^2 + (b-1)x + b = o have a common root?

    asked by mathsen
  88. math

    Is it possible to arrange the integers from 1 to 240 in a table with 15 rows and 16 columns so that the sum of the numbers in each of the columns would be the same?

    asked by mathsen
  89. math

    Simplify: 2/1! - 3/2! + 4/3! - 5/4! + ... + 2010/2009! - 2011/2010!, where k! denotes the product of all integers from 1 up to k, that is, 1! = 1, 2! = 1x2 = 2, 3! = 1x2x3 = 6, and so on.

    asked by mathsen
  90. math

    Prove that a^4 + b^4 + c^4 ¡Ý b^2ac + c^2ab holds for all real numbers a, b and c.

    asked by mathsen
  91. math

    Prove that if real numbers a, b and c satisfy a + b + c > 0, ab + ac + bc > 0 and abc > 0, then each of a, b and c is positive.

    asked by mathsen
  92. sociology

    Focus of the Research Paper Select one social institution family, health-care, religion, education, mass media, political, or economic (family being my choice) as defined in the text. Using the three Sociological theories listed in chapter one of the text

    asked by nnn
  93. Math

    Suppose that the number of cars, C, on 1st Avenue in a city over a period of time t, in days, is graphed on a rectangular coordinate system where time is on the horizontal axis. Further suppose that the number of cars driven on 1st Avenue can be modeled by

    asked by Crissy