Posts by tanisha

Total # Posts: 120

  1. Maths probability

    Records show that 8% of blood samples tested for a certain condition test positive. Assuming that whether or not a blood sample tests positive is independent of whether or not any other blood sample tests positive, calculate by hand the following probabilities to three signi?...
  2. maths

    In an A.P., the first term is 2 and the sum of the first five terms is one-fourth of the next terms. Show that 20th term is -112.
  3. Maths

    here are some of the ingredients for bolognese sauce 400g minced beef 800g chopped tomatoes 600ml Stock 300ml red wine Julie has only had 300g of minced beef how much of other ingredients should she use
  4. statistics

    Directional and nondirectional hypotheses can be easily interchanged according to the hypothesis the researcher is testing. For instance, a drug company might predict that a drug will help a subject lose weight while another drug company might predict that a drug will alter a ...
  5. Science

    Explain briefly how it is 43.84%
  6. Math Heeeeelp!!!

    I chose A...i guessed. Its really hard
  7. Math Help!!!

    How many 3 letter sequences can be formed if the first letter must always be a consonant (not a, e, i, o, u), the second letter must always be a vowel (a,e,i,o,u) and 3rd letter must be different from the first. A. 2100 B. 4056 C. 3250 D. 2625 I chose A... i guessed
  8. Math Help!!!

    How many ways are there to choose a potato and two green vegetables from a choice of three potatoes and seven green vegetables? A. 126 B. 63 C. 21 D. 252 i chose A. But im 50% not sure Please help test tomorrow something similar
  9. math Help!!!!

    You have 1 red marble, 1 blue marble, 1 yellow marble and 1 white marble. You draw 2 marbled out of the bag without replacing. What is the probability that you may choose 1 red marble?
  10. math...Please help!!!!

    This is a standard deviation question. I don't know much about standard deviation. Here it goes... Teachers making 30,000 to $60,000 the union is considering a $1,000 pay raise. A. Will the standard deviation change and the mean and the median stay the same? B. Will the ...
  11. math

    5 kids median age is 9. Two of the kids ages are 5. The range of all the kids is 7. What is the age of the 2nd to the oldest. Please help....! a. 5 b. 7 c. 9 d. 12 to figure it out, i tried this 1. 12 2. 11 3. 9 4. 5 5. 5
  12. math

    What is the shape of a linear function on a coordinate plane. choices are: a. circle b. ellipse c. vertical d. horizontal I chose "D"
  13. math

    -4 + 6 + 2(7) = I put 2+14 = 16
  14. math

    -4 + 6 + 2(7) = I put 2+14 = 16
  15. math

    Monday -4 degrees Fahrenheit increase 6 degrees. On Tuesday it increased 2 degrees. For the next 7 days it increased. What is the temperature on the 9th day?
  16. math

    Andy averages 17 points per game during 5 games of the basketball season. If he scored 12, 24, 20, 18 in four of the games. How many points did he score in the 5th game. 17 * 5 = 85 12 +24 +20 +18 +x = 74 85-74 = 11
  17. math

    The answer is 30
  18. Math

    So. The answer is seven
  19. business math

    . Ludwig borrowed $8,000 on July 20, at 11% interest. If the loan was due on October 17, what was the amount of interest on the loan using the exact interest method?
  20. Cooking catering

    When your creating garnishes which of the following is the most adaptable to creative and interesting shapes
  21. Finite Math

    The purchases made by customers at a convenience store are normally distributed, with a mean of $5.50 and a standard deviation of $3.50. What is the probability that a randomly chosen customer makes a purchase between $2.00 and $9.00?
  22. art

    What happens when negative and positive shapes begin to fuse together?
  23. math

    I don not now how to do this
  24. business math

    . $13,027.57
  25. Chemistry

    If 23.7g of C8H18 are combusted, what mass of water will be produced?
  26. Business Math

    2. The interest on $6,000 at 6 percent compounded semiannually for 8 years is: (Use table in the handbook) (Points : 1)
  27. Business Math

    7. By using the table in the handbook, the present value of $12,000 for six years compounded at 6 percent semiannually is:
  28. Math

    Cost of 1m shirt material=Rs50 Cost of 1m trouser material=Rs90 Let Has an buys shirt material =3x Hasan buys trouser material =2x Cost of shirt material cloth=Rs50×3x=150x Cost of trouser material cloth =Rs90 ×2x=150x S.P. of shirt material =C.P.&...
  29. Chemistry

    A reaction has a standard free-energy change of -11.80 kJ/mol (-2.820 kcal/mol). Calculate the equilibrium constant for the reaction at 25 degrees C. Please help!
  30. 2nd grade math homework

    does the broken key 5 means not to use the number5
  31. math

    show25 broken key is 5 show in 3 ways
  32. math

    please help with daughters homework show 25 broken key is 5 show in 3 ways
  33. English

    how does the The character in “My Mother” feel?
  34. sentence skills

  35. Math

    Rebate 12000 Discount 2.4
  36. Physics

    what is calculus
  37. math

    The volume of a cone is three hundred cubic kilometers. If the radius of the base is 9 kilometers, what is the height of the cone? Use three point one four for pi. Show your work and round to the nearest tenth.
  38. chemistry

    Calculate the wavelength (in nanometers) of a photon emitted by a hydrogen atom when its electron drops from the n = 4 state to the n = 3 state.
  39. english

    what is a good thesis statement for jim crow laws?
  40. chemistry 106

    Methanol, ethanol, and n-propanol are three common alcohols. When 1.00 g of each of these alcohols is burned in air, heat is liberated. Calculate the heats of combustion of these alcohols in kJ/mol. (a) methanol (CH3OH), -22.6 kJ (b) ethanol (C2H5OH), -29.7 kJ (c) n-propanol (...
  41. chemistry 106

    A 0.1589 g sample of solid magnesium is burned in a bomb calorimeter that has a heat capacity of 1769 J/°C. The calorimeter contains exactly 251 g of water, and the temperature increases by 1.126°C. Calculate the heat given off by the burning Mg, in kJ/g and in kJ/mol.
  42. chemistry 106

    Calculate the work done if a gas is compressed from 8.3 L to 3.3 L at constant temperature by a constant pressure of 3.0 atm, and give your answer in units of joules. (1 L · atm = 101.3 J)
  43. chemistry 106

    The first step in the industrial recovery of zinc from the zinc sulfide ore is roasting, that is, the conversion of ZnS to ZnO by heating. 2 ZnS(s) + 3 O2(g) → 2 ZnO(s) + 2 SO2(g) ΔH = -879 kJ/mol Calculate the heat evolved (in kJ) per gram of ZnS roasted.
  44. chemistry 106

    Determine the amount of heat (in kJ) given off when 2.23 multiplied by 104 g of ammonia are produced according to the following equation. Assume that the reaction takes place under standard-state conditions at 25.0°C. N2(g) + 3 H2(g) 2 NH3(g) ΔH°rxn = -92.6 kJ
  45. chemistry 106

    Which of the following standard enthalpy of formation values are not zero at 25°C? (Select all that apply.) H2(g) N2(g) Au(s) Be(s) H20(g) Ne(g)
  46. math

    what is -.ooo552 in scientific notation
  47. chemistry 106

    Dry air near sea level has the following composition by volume: N2, 78.08 percent; O2, 20.94 percent; Ar, 0.93 percent; CO2, 0.05 percent. The atmospheric pressure is 1.00 atm. (Hint: Since volume is proportional to the number of moles present, mole fractions of gases can be ...
  48. chemistry 106

    Nitroglycerin, an explosive compound, decomposes according to the equation below. 4 C3H5(NO3)3(s) 12 CO2(g) + 10 H2O(g) + 6 N2(g) + O2(g) Calculate the total volume of gases when collected at 1.2 atm and 25°C from 1.3 multiplied by 102 g of nitroglycerin. What are the ...
  49. chemistry 106

    calculate the pressure exerted by 1.00 moles of CO2 confined in a volume of 5.00 L at 450. K. Compare the pressure with that predicted by the ideal gas equation.
  50. chemistry 106

    A gas-filled balloon having a volume of 1.50 L at 1.2 atm and 25°C is allowed to rise to the stratosphere (about 30 km above the surface of Earth), where the temperature and pressure are -23°C and 3.00 multiplied by 10-3 atm, respectively. Calculate the final volume of...
  51. chemistry 106

    The pressure of 6.0 L of an ideal gas in a flexible container is decreased to one-half of its original pressure, and its absolute temperature is decreased to one-seventh of the original. What is the final volume of the gas?
  52. Geometry

    a right triangle has legs of 24 units and 18 units. the lenght of the hypotenuse is?
  53. Introduction Enngineering

    i need bad help
  54. Science

    what are the 6 rules to draw atoms?
  55. ALGEBRA 1

    2/3+y=3/4 please show your work
  56. ALGEBRA 1

  57. Algebra 1

    nika did you just copy the answer? thnx Ms. Sue
  58. Algebra 1

    solve this equation. show ur wrk work plz. 8y-(2y-3)=9
  59. Language Arts

  60. Language Arts

    what is free verse poetry? What are all of the examples of poetry?
  61. Social Studies

    its not opening up
  62. Social Studies

    What role did religious freedom play in the founding of Rhode Island and Pennslyvania?
  63. Language Arts

    what is an antonym for rationalize?
  64. Us History

  65. Us History

    why were europeans interested in asia?
  66. World History

    which country had more than a dozen colonies in what is now the U.S along the atlantic coast by the mid-1700s? a.holland b.britain c.spain or d.france
  67. Intro to physical science

    I need a relating topic to physical science that is relating to the reasl world?
  68. math- pre algebra

  69. math- pre algebra

    can you help me with this equation and may you please show your work? -3=3-y
  70. Technology

    Is a cellphone an electrical appliance
  71. maTH

    ok Ms.Sue may you help me?
  72. PRE*******ALGEBRA

    WRITE A FUNCTION RULE TO DESCRIBE EACH SITUATION. PLEASE HELP I DO NOT UNDERSTAND THIS AT ALL. The number of pounds p(z)as a function of the number of ounces z. The selling price s(c)after a 45% markup of an item as a function of the stores' cost c. The total number of ...
  73. math

    The medians are 33 and 36 then you add 33 and 36 and divide the solution of the numbers by 2 and you should get 34.5 or 34 1/2.
  74. Pre Algebra Math

    How to write a rule for a linear function?
  75. Science

    Why do astronomers need to use special methods to detect star systems?
  76. math pre algebra

    thank you very much Bob!!
  77. math pre algebra

    what is the slope of y=5x-6 and y=7/2x +5 ?
  78. Pre Algebra

    what is the slope of y=5x - 6 and y= 7/2x + 5 ?
  79. Pre Algebra

    5x-y=6 what is the equation in slope intercept form?
  80. algebra 2

    thats part of algebra 2 that's easy were doing that now in pre algebra
  81. Social Studies

    Why are foreign investors hesitant to invest in many countries in East Africa?
  82. science

    this isnt me i never asked this question
  83. science

    explain how trees affect the water cycles including deforesting
  84. Social Studies

    what are the main resources of Sudan in East Africa?
  85. Social Studies

  86. Social Studies

    nothing i donteven know what unrest means.
  87. Social Studies

    How has unrest hurt Rwanda and some other East African countries?
  88. Social Studies

    I think irrigation might make a region's land and soil more fertile and suitable for farming.
  89. Social Studies

    How might irrigation help a region's economic development?
  90. Science

    If a planet had a surface with craters but no other features, what could I say about the inside of the planet?
  91. social studies

    Where is the eastern rift located? Where is the western rift located?
  92. Math Pre Algebra

    for the second one do i do 1348(0.0025)(1.5)= 5
  93. Math Pre Algebra

    oh ok thank you
  94. Math Pre Algebra

    so the answer or the first one is 135 and im not supposed to add 900 to 135?
  95. Math Pre Algebra

    Find the simple interest. $900 deposited at an interest rate of 3% for 5 years. $1,348 deposited at an interest rate of 2.5% for 18 months.
  96. Science

    I have two questions. How can an atmosphere affect the temperature of a planet's surface? If a planet had a surface with craters but no other features, what could you say about the inside of the planet?
  97. Geography

  98. Geography

    How does climate types found in East Africa influence what grows there? Thank You in Advance to whoever helps me!!
  99. Math - Pre Algebra

    Thank you soo much!! But can you show me the steps on how to caculate 1280(1.13)^3.
  100. Math - Pre Algebra

    $1280 at 13% compound annually for 3 years Use the formula: B= p(1+r)n Please help me I need the answer for tommorow
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