Newest questions posted by Annie
  1. Geography

    Which adaptions did early humans make during the last ice age in order to survive varied environments? Select all that apply. A. created religions to offer sacrifices to gods B. made shelters out of available materials C. worked in larger networks of
  2. Math

    What is the range of this data set? 27, 5, 11, 13, 10, 8, 14, 18, 7 A.22 B.7.5 C.11 D.16
  3. History

    what idea emerged as a result of the protestant reformation is also reflected in modern democratic governments a. self-government* b. religious tolerance c. humanism d.censorship
  4. Math

    What is the unknown digit that makes the statement true? 2.48>2.4___1>2.463
  5. Chemistry

    How much faster does nitrogen monoxide (NO) effuse in comparison to dinitrogen tetraoxide (N2O4)
  6. Quadratic Functions and Equations

    A field hockey tournament is to be held in Yellowknife, NWT. According to regulations, the field is 25 yards by 100 yards. For officials, support groups and team members, a uniform rectangular strip of manicured lawn is to be installed by a local business
  7. physics 11

    An arrow is shot horizontally towards a target 20 m away. In traveling the first 5 m horizontally, the arrow falls 0.2 m. In traveling the next 5 m horizontally, what will the arrow additionally fall?
  8. Math

    For some k>0 the lines 50x+ky=1240 and ky=8x+544 intersect at right angles at the point (m,n).find m+n.
  9. Math

    For some k>0 the lines 50x+my=1240 and my=8x+544 intersect at right angles at the point (m,n).find m+n.
  10. Chemistry

    Balance the following half-reaction under basic conditions. NO3^− → NH3
  11. Chemistry - Coordination Complex

    Determine the number of unpaired electrons expected in terms of crystal field theory: a) [Fe(NO_2)_6]^3− b) [Fe(H_2O)_6]^3+
  12. social studies

    what did the actions of the border ruffians demonstrate about the slavery debate? select all that apply a. that opposing sides would resort to violence b. that abolitionists would triumph by using the press c. that settlers would follow the laws d. that
  13. Math

    Need this answered today also explain the answers please Julia measured the high temperature in her town for one week. Using the chart below, find the mean absolute deviation for the high temperatures. Round your answer to the nearest tenth. Be sure to
  14. Math

    Evaluate: |4 - 8(3 - 12)| - |5 - 11| =
  15. Spanish

    Please help me work this out with the future verb tense. Completa el párrafo con el futuro de los verbos de la lista. No es necesario usar todos los verbos. asustarse casarse conseguir escribir estar hacerse olvidar ser tener terminar Nunca (1) ____lo que
  16. Chemistry

    Initial[A] Initial [B] Initial Rate, M/s .740 M .010 M 3.00e-10 .740 M .030 M 8.09e-9 .740 M .060 M 6.46e-8 .740 M .070 M 1.03e-7 What is the order of the reaction with respect to the concentration of B?
  17. Math

    For a population with a standard deviation of s = 12, a z-score of z = +0.50 corresponds to a score that is above the mean by 6 points.​ True or False
  18. Math

    A population with μ = 59 and s = 8 is standardized to create a new distribution with μ = 100 and s = 20. After the transformation, an individual receives a new score of X = 90. The original score for this individual was X = 51. True or False
  19. Math

    One method for correcting the bias in the standard error is to “pool” the two sample variances using a procedure that allows the bigger sample to carry more weight in determining the final value of the variance. True or false
  20. Math

    A repeated-measures research study comparing two treatments with a set of 10 scores in each treatment will produce a t statistic with df = 19. True or False
  21. Math

    A repeated-measures study and an independent-measures study both produce t statistics with df = 20. The independent-measures study used more participants. True or False
  22. Math

    The term correlation refers to a statistical technique that is used to ____.​ measure and describe the linear relationship between two variables measure the magnitude of a variable measure the significance of a variable measure the fit of a model
  23. Math

    The distance between the Y value in the data and the Y value predicted from the regression equation is known as the residual. What is the value for the sum of the squared residuals?​ SSresidual = r2(SSX) SSresidual = (1 – r2)(SSX) SSresidual = r2(SSY)
  24. Math

    A set of n = 15 pairs of X and Y scores has SSX = 10, SSY = 40, and SP = 30. What is the slope for the regression equation for predicting Y from X?​ 10/30 10/40 40/10 30/10
  25. Math

    A set of X and Y scores has SSX = 20, SSY = 10, and SP = 40. What is the slope for the regression equation?​ 4.0 2.0 0.25 0.50
  26. Biology

    Which of the following best explains the absence of fossil evidence from before the Cambrian at the time of Darwin? a) There were no animals b) The animals were very small c) The animals were soft and not likely to fossilize d) The animals were not in
  27. Chemistry

    Identify the longest, shortest, strongest, and weakest bonds? A. H3C-C---C-H B. (H3C-H)>----
  28. ELA

    Replace the underlined definitions with these words. (icant really underline so i will just put quotations) WORDS: Navigate Altitude Destination Landmark Radar Bearing Propelling Equipped Transmitted Recurring Profited 1)The pilot, who never wore green,
  29. ELA

    Write the words that completes each pair of phrases. WORDS: Propelling Equipped Transmitted Recurring Profited 1) __ dreams, __ fever 2) __ for an expedition, __ for battle 3) __ from the experience, __ from your advice 4) __ the message, __ an electrical
  30. world history

    In Aztec society, women were (Choose all that are correct).
  31. world history

    Where were the Aztecs told to build their capital?
  32. world history

    What was the penalty for gossip in Aztec society?
  33. world history

    What did young men learn in Aztec public schools? Select all that apply.
  34. Math

    Stage 1: 1 = 1 Stage 2: 1+3 = 4 Stage 3: 1 +3+5 = 9 Stage 4: 1+3+5+7= 16 a. Find the next four stages and their sums. b. What is the sum in Stage 20? c. In what stage will the sum be 567? What is the greatest number added in the sum of this pattern?
  35. Chemistry - Chemical Kinetics

    Could you reduce the concentration of a reactant by one half in Experiments 2-4 and achieve the same purpose as doubling their concentration? Why or why not? (I want to say yes, because the ratios will still be the same. Would that be right?) Data for
  36. Chemistry - half life

    What is the half-life (in h) for the decomposition of O3 when the concentration of O3 is 2.37 ✕ 10−6 M? The rate constant for this second-order reaction is 50.4 L/mol/h.
  37. Physics

    A weight with mass m hanging from a ceiling is pulled so that the string is at angle θ from the vertical and remains stationary. Draw the force diagram for the mass m, label the forces and resolve them into their x- and y-axes components. Calculate the
  38. Math

    If two integers a and b have a product of 34. What is the least sum of a and b
  39. physics

    A 13.0 gram sample of an unknown metal at 30.0*C is placed in a Styrofoam cup containing 50.0 grams of water at 90.0*C.The water cools down and the metal warms up until thermal equilibrium is achieved at 87.0*C.Assuming all the heat lost by the water is
  40. math

    What is the area of a quadrilateral ABCD, if AB = 5 cm, BC = 13 cm, CD = 9 cm, DA = 15 cm, AC = 12 cm?
  41. math

    Given: ABCD is a parallelogram AM , BN − angle bisectors DM = 4 ft, MN = 3 ft Find: The perimeter of ABCD
  42. math

    A rhombus ABCD has AB = 10 and m∠A = 60°. Find the lengths of the diagonals of ABCD.
  43. Rational number

    7/11, -8/6, -6/8, 9/4, 27/25 arrange the rational number in ascending order
  44. Maths

    sarika prepared squash from tomato,carrot,apple juices. 1/3 of the squash was tomato juice and 2/3 of the remainder was carrot juice. 315 ml of squash vs carrot juice. what volume of the squash was apple juice?
  45. Maths

    kuldeep had a sum of money. He saved 1/4 of it. He spent 4/9 of the remaining on suitcase. a) What fraction of his money sent on suitcase? b) What fraction of his money was left?
  46. Maths

    A cylinder has volume 12cm^3. What will be the volume of a cone with the same base area and perpendicular height?
  47. math

    Given: ABCD is a rhombus, AB = 6, and m∠A=60° Find: The height.
  48. math

    It takes a ship 3 hours to cover 72 km with the current and 4 hours against the current. Find the speed of the ship in still water and the speed of the current.
  49. math

    A motorboat covers the distance from one pier to the other pier in 4 hours and the way back in 5 hours. What is the speed of the boat in still water, if it covers 70 km with the current in 3.5 hours?
  50. math

    Two shelves contain 55 books. If half of the books from the second shelf were relocated to the first shelf, then the first shelf would contain 4 times more books than the second one. How many books are there on each shelf?
  51. math

    The sum of two numbers is equal to 63 and their difference is equal to 12. Find the numbers.
  52. Algebra 2

    Amelia is documenting the height of sunflower plants each week. She has determined the function to be f(x) = 3x + 3, where x represents time and f(x) represents the height of the plant. Which of the following options describes the restrictions to the
  53. math

    A diagonal of a parallelogram forms 25° and 35° angles with the sides of a parallelogram. Find the angles of the parallelogram.
  54. math

    In a class, every student knows French or German (or both). 15 students know French, and 17 students know German What is the smallest possible number of students in that class?
  55. math

    An old lady has 125 cats. Seven of them are old, 9 of them are her favorite, 5 of them are both (old and favorite). How many of them are neither old nor favorite?
  56. Algebra With Pizzazz

    I missed a week of school and I know nothing. Next thing I know we get page 163 and have to do everything on it. I don't know anything it's on System of equations substitutinal method.
  57. Algebra

    The value of a new car decreases by 35% in the first year. If a car costs $9,800 when new, how much less would it be worth at the end of the first year?
  58. Chemistry

    its takes 145 mL of zinc nitrate to react completely with 175 ml of 1.5 M potassium hydroxide. what is the concentration if zinc nitrate?
  59. Calculus AB

    What's the lim(x-->-infinity) sqrt(x^4-1)/(x^3-1)? I've tried solving for it but I got -1/0, which would make it undefined. Is that correct?
  60. Calculus AB

    So the problem is "For x>0, d(lnx)/dx = 1/x and lne=1. A) find the tangent line approximation for ln 3 B) calculate the %error in approximation in part A. My teacher said the answer for part A is that 1/e, and I'm pretty confused. So far I the given info
  61. math2

    When s is measured in meters and t is measured in seconds, find the velocity at t = 2 of the following a. s = t^2 + 3t b. s = t^3 - 3t^2 c. s = squareroot t + 2 Help plz
  62. science(physics)

    Why a minibus is more likely to topple over when the roof rack is heavily loaded than when the roof rack is empty?
  63. Math

    The population of a city has been decreasing exponentially since 1990. In 1990, the population was 1,000,000. In 2010, the population was 560,000. If t represents time in years since 1990, which of the following equations best models the decay of the
  64. Calculus AB

    Please help me with this WS 1) Find the value of lim as x-->-(square root of 3) of (-x^4 + 5x^2 -6)/(x+(square root of 3) 2) Find the distance between the discontinuities of g(x)= ((square root of x-4))/(x^2 -5x -1) 3)Find the value of x at which the curve
  65. chemistry

    Write a balanced equation for the reaction of liquid bromine with chlorine gas.
  66. Calculus AB

    Could someone please help me with these tangent line problems? 1) Find the equation of the line tangent to the given curve at the indicated point: 3y^3 + 2x^2 = 5 at a point in the first quadrant where y=1. 2) Show that there is no point on the graph of
  67. science

    a body of mass 10kg is moved in a vertical circle calculate tangential acceleration
  68. Chemistry

    Write mathematical equations that show how you will calculate the detected activity from the count rate due to background radiation and the sample of KCl and how you will determine the “true” activity of your sample from the detected activity. Use the
  69. Calculus AB

    I'm not sure how to go about this problem: Find the equation of the line tangent to the curve x^2 + 2xy + y^3 = 4 at y=1 in the 1st quadrant.
  70. Calculus AB

    There's these two word problems I don't understand. 1. A man 6 ft tall walks at a rate of 5 ft per second toward a streetlight that is 30 feet high. The man's 3-foot-tall child follows at the same speed, but 10 feet behind the man. a) Suppose the man is 90
  71. Chemistry

    To treat a burn on your hand, you decide to place an ice cube on the burned skin. The mass of the ice cube is 18.5 g, and its initial temperature is -13.3 °C. The water resulting from the melted ice reaches the temperature of your skin, 28.4 °C. How much
  72. English Lit

    1. What pattern or structure is there to the development the the plot? Describe the way the events are organized. Is the structure significant to the meaning? "Car Crash While Hitchhiking" -Denis Johnson
  73. Calculus AB

    Um I don't really understand these word problems so could someone help me please? 1) An object is thrown upward with an initial velocity of 5 m/s from an initial height of 40 m. Find the velocity of the object when it hits the ground. Assume that the
  74. Calculus AB

    Sorry but I've got a lot of problems that I don't understand. 1) Let f(x)= (3x-1)e^x. For which value of x is the slope of the tangent line to f positive? Negative? Zero? 2) Find an equation of the tangent line to the oven curve at the specified point.
  75. Calculus AB

    Could someone please help me with this? Calculate the instantaneous rate of change of f at x=6.
  76. Chemistry

    Please write down the redox reactions (using the half-reaction method!) a)Cl2 from OCl- and Cl- in acidic solution b)Br2 from BrO3- and Br- in acidic solution -You don't have to do both, but could you help me step up the half reactions especially for OCl-
  77. Algebra

    solve for the negative value of x: I know if you solve for a positive value, the answer for x=13; but how to get the negative value. |2x-8|=18
  78. math

    a recipe for fudge brownies calls for 3 5/8 cups of cocoa per bath. if you are making 2 1/2 batches, how many cups are needed?
  79. Science

    Mom:Circke face Dad: Oval face Son: ? what's the son genotype & phenotype? may someone give me an example and help me under this question, please.
  80. math

    Of 45 students 30 play badminton and 26 play tennis. Each student play either badminton or tennis,determine how many students play:(a)badminton only (b) tennis only
  81. Math

    How many fl oz would go pinto 6.5
  82. Calculus AB

    Please help I'm stuck on this problem for the past hour. Define f(x)= { Ln lx-1l }/x A) show that f(c) is continuous at x=2 B)Where on the interval [-2,2] is f discontinuous? Show the work that leads to your conclusion. C) classify the discontinuities in
  83. Social Studies

    Which of the following was the provision in the Treaty of Paris in 1763? a. All French land in North America was to be given to England b. All French land in North America was to be given to Spain c. All French lands west of the Mississippi and Louisiana
  84. Language Arts

    Which of the following topics would be most appropriate for an autobiography narrative? A. your opinion of the opening ceremony at the Olympic Games B. your explanation of how to download MP3 files to your personal musical device C. your account of your
  85. AP Biology

    What are the phenotypes of the long-nosed cusimanse? I can't find any site about their body structure or function either.
  86. Chemistry

    If you are asked to make exactly 1.0 Liter of 0.80 M ZnCl2 solution, how many grams of zinc chloride would you need to be massed out? How do I go about solving this problem?
  87. English

    Read the following poem and then respond to the question below: “I’m Nobody! Who are you?” By Emily Dickinson I’m Nobody! Who are you? Are you – Nobody – too? Then there’s a pair of us! Don’t tell! they’d advertise – you know! How
  88. Psychological

    Which of the following statements regarding the nature of stress is true? A. Accumulating hassles may well lead to a sudden onset of PTSD. B. Psychophysiological disorders are primarily mental disorders. C. Continued exposure to stress is associated with
  89. Math

    For questions 3 and 4, simplify each expression. 1. 4^4/4^6 -16 16 1/16
  90. Math

    Write each expression using a single exponent 1. x^9/x^2 a)x^11 b)x^7
  91. physics

    An insulated beaker contains 300g of water initially at 30 degree celsius. water at 100 degree celsius is added until the temperature of mixture reaches 50 degree celsius . the specific heat capacity of water is 4.2J/(kg degree celsius). how much water is
  92. Algebra

    A chemist mixed a 70% alcohol solution with a 30% alcohol solution to make a 45% alcohol solution. How many liters of each were used to make 120 L of a 45% solution? I tried solving this with elimination method and made two separate equations. For
  93. Math Help- Areas!!!!

    For problems 4-5, find the surface area of the cylinder in terms of pi. (cylinder is 18 cm high and 14 cm wide) A. 350 pi cm2 B. 896 pi cm2 C. 602 cm2 D. 644 pi cm2***? (cylinder is 20 inches high and 18 inches wide) A. 396 pi in2 B. 522 pi in2 C. 360 pi
  94. Trigonometry and Right Triangles!

    The length of the hypotenuse of a 30 60 90 triangle is 16. What is the perimeter? I'm just learning about this. Can someone explain?
  95. Math Help!!!

    How do I solve for sin24=CD/BC if BC is 15,052.07464? Thanks!
  96. physics

    on the road with Kate. If she is driving a 2500kg car going 75km/h a)how much kinetic energy will it process. b)She asks "How high would I have to lift the car for the same amount of potential energy"? converting 75km/h to m/s
  97. science

    The cohrence length of a light source is 2.45×10raise to power-2 calculate width of spectral line
  98. science

    write down the possible terms of one electron system corresponding to n=2
  99. science

    find the energy of first excited state of helium
  100. math

    Write the following sets in set. Builder notation. B is the set of even natural numbers greater than 15 and smaller than 29


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