Posts by anna

Total # Posts: 2,803

  1. Chemistry

    If a solution has a pH of 8.14, calculate [H3O+]?
  2. Social Studies PLZ HELP ASAP

    Analyze the effect that plentiful harvests had on population in the ancient civilizations of the mainland's river valleys. Write a one-paragraph answer. Plz help me with this, i dont understand.
  3. Math

    Stem-and-Leaf plots Use stem-and-leaf plot to answer questions 1-3 ----|----- 5| 4, 5 6| 0, 6, 9 7| 2, 3, 4, 5, 5 8| 1, 2, 8, 9 9| 5, 6 Key: 5|4 = 54 1. What is the range of data? A. 40 B. 42 ** C. 54 D. 96 2. What is the median of the data? A. 64.5 B. 72.5 C. 74.5 D. 75 ** 3...
  4. Math

    I agree
  5. Math

    Paige's dad just made a new front door for their house The door measures 84 inches by 54 inches How many square inches will Paige have to paint if she paints the front side of the door?
  6. Calculus - derivatives of e

    Find an equation of the tangent line to the graph of y = e^(?x^2) at the point (5, 1/(e^25)). My work: y' = -2xe^(-x^2) y' when x = 5 = -10e^25 y - (1/e^25) = -10e^25 * (x - 5) y = (-10e^25) (x - 5) + (1/e^25) This is incorrect. How?
  7. Math

    Rent-splitting Math Help FLOOR PLAN DETAIL 2X2 - LARGE The rent includes the rental amount for the bedroom and shared occupancy of the common areas. Rental price displayed is less a $60/month utility package and $10/month green fee inclusive of: water, electric, sewer, trash, ...
  8. chemistry

    how many grams of chlorine are in 2.01 grams of TiCl4?
  9. Biology

    All the following statements concerning the theory of evolution by natural selection are true EXCEPT: The bodies of organisms in a population change by use and disuse, and the changes are inherited by the next generation. Why is the above the correct answer?
  10. crime

    Did the individuals involved follow the legal guidelines for searches? Why or why not? Did the exclusionary rule apply in this situation? Why or why not? Provide one example in which the exclusionary rule would apply if the individuals involved had done something differently. ...
  11. math

    Water is being pumped out of a pool. the number of gallons of water W left in the pool at time t in minutes can be modeled by W(t) = -7t+ 350. Find the y-intercept and explain what it represents in this problem.
  12. Calculus (increasing/decreasing)

    Thank you so much! I understand now.
  13. Calculus (increasing/decreasing)

    Find the interval(s) where the function is increasing and the interval(s) where it is decreasing. (Enter your answers using interval notation. If the answer cannot be expressed as an interval, enter EMPTY or ?.) f(x) = (5 ? x^2) / x my work: a) f'(x)=(-x^2-5)/x^2 b) set ...
  14. Physics

    Three point charges are fixed on the x-axis: 8.7×10^?6 C at x = ?0.68 m, ?3.0×10^?6 C at the origin, and 2.6×10^?6 C at x = 0.65 m. Find the electrostatic force acting on the charge at the origin due to the other two charges. Let a positive value indicate a ...
  15. calculus

    A corporation starts to invest part of its revenue continuously at rate of P dollars per year in a fund for future expansion plans. Assume the fund earns money at an annual interest rate, r, compounded continuously. The rate of growth of the amount A in the fund is given by dA...
  16. Math calculus 2

    A 500-gallon tank initially contains 200 gallons of brine containing 85 pounds of dissolved salt. Brine containing 1 pounds of salt per gallon flows into the tank at the rate of 44 gallons per minute, and the well-stirred mixture flows out of the tank at the rate of 1 gallon ...
  17. math

    There is a sudden growth of algae in a lake that kills other life in the water such that y tons of algae will be present after t weeks. The rate of growth of the algae is y?=ty+t and the initial amount of algae is 7 tons. How long will it take the initial amount of algae to ...
  18. math

    There is a sudden growth of algae in a lake that kills other life in the water such that y tons of algae will be present after t weeks. The rate of growth of the algae is y′=ty+t ...
  19. Physics

    A loop circuit has a resistance of R1 and a current of 2.2 A. The current is reduced to 1.7 A when an additional 3 ? resistor is added in series with R1. What is the value of R1? Assume the internal resistance of the source of emf is zero. I got 12.75 however that isn't ...
  20. Physics

    The correct answer was actually 10.2
  21. Physics

    Got 12.75 however that answer is incorrect.
  22. Physics

    A loop circuit has a resistance of R1 and a current of 2.2 A. The current is reduced to 1.7 A when an additional 3 ? resistor is added in series with R1. What is the value of R1? Assume the internal resistance of the source of emf is zero.
  23. History

    Which of the following statements best describes the middle class during the Industrial Revolution?A. The middle class lived in tenements because they faced harsher economic problems. B. The middle class women did not do physical labor and instead they hired maidservants to ...
  24. college

    how to evaluate sin(a) when adj =4 and oposit side 10?
  25. college

    how to evaluate sin(a) when adj =4 and oposit side 10?
  26. english

    What is the difference between present perfect and present perfect continuous tense? Can I get some examples please?
  27. science

    What are the most important events in the history of animal life that occurred at the beginning and at the end of the paleozoic
  28. Math

    How do we find ths next number in the sequence 0.2 , 4 , 3 , 10 , 14
  29. Math

    Joan needs 1 2/3 cups of flour to bake a batch of cookies.How many batches can dge make with 12 cups of flour?
  30. Language Arts 6 A- Unit 3: Life Stories

    15. A 5. A 1. D
  31. Language Arts 6 A- Unit 3: Life Stories

    15. Which sentence contains an error in subject-verb agreement? a. A family of squirrels live in my yard. b. Nobody wants to go to bed early. c. Chris and Susan live in the city. d. A group of elephants is called a herd 5. This selection was most likely written to: a. inform b...
  32. math

    Haven't gotten an answer as of yet, thanks.
  33. algebra

    The number of boxes on a truck varies directly with the time since the workday began. At 3 hours after the workday began, there are 207 boxes on the truck. How many boxes should we expect there to be on the truck 7 1/3 hours after the workday began?
  34. math

    Still don't understand how you got 82.
  35. math

    Julia invests $80,000 in an account which pays 5.97% interest compounded quarterly. After 20 years and 6 months, how much money will she have in the account?
  36. Chemistry

    How many stereoisomers does [Pt Br4 Cl2]2- have? I think it has 2 geo., but how many optical?
  37. Math

    How do we find power series when given a function?
  38. physics

    The spring of a spring gun is compressed a distance d of 3.2 cm from its relaxed state, and a ball of mass m = 12g is put in the barrel. With what speed will the ball leave the barrel once the gun is fired? The spring constant is 7.5 N/cm. Assume no friction and a horizontal ...
  39. Physics

    A - A boy runs 12.7 blocks North, 7.5 blocks Northeast, and 14.4 blocks West. Determine the length of the displacement vector that goes from the starting point to his ?nal position. B - Determine the direction of the displacement vector. Use counterclockwise as the positive ...
  40. Physics

    A quarterback takes the ball from the line of scrimmage, runs backward for 19.0 yards, then runs sideways parallel to the line of scrimmage for 12.0 yards. At this point, he throws a 43.0-yard forward pass straight down the ?eld. What is the magnitude of the football’s ...
  41. Physics

    A -A child rides a toboggan down a hill that descends at anangle of21.8? to thehorizontal. The hill is 42.6 m long. What is the horizontal component of the child’s displacement? Answer in units of m. B - What is the vertical component of the child’s displacement? ...
  42. Math

    20+40
  43. English

    #1 means #2 per the use of "the." It does not mean #3 since "any" is a general statement.
  44. Physics

    A hummingbird ?ies 2.7 m along a straight path at a height of 5.3 m above the ground. Upon spotting a ?ower below, the hummingbird drops directly downward 1.8 m to hover in front of the ?ower. a) What is the magnitude of the hummingbird’s total displacement? Answer in ...
  45. English

    2 is not generic since it's talking about a specific apple
  46. Physics

    It's still incorrect.
  47. Physics

    A hummingbird ?ies 2.7 m along a straight path at a height of 5.3 m above the ground. Upon spotting a ?ower below, the hummingbird drops directly downward 1.8 m to hover in front of the ?ower. a) What is the magnitude of the hummingbird’s total displacement? Answer in ...
  48. Math

    65-24 = 41
  49. Physics

    A - A hummingbird ?ies 2.7 m along a straight path at a height of 5.3 m above the ground. Upon spotting a ?ower below, the hummingbird drops directly downward 1.8 m to hover in front of the ?ower. a) What is the magnitude of the hummingbird’s total displacement? Answer in...
  50. Physics

    A - A hummingbird ?ies 2.7 m along a straight path at a height of 5.3 m above the ground. Upon spotting a ?ower below, the hummingbird drops directly downward 1.8 m to hover in front of the ?ower. a) What is the magnitude of the hummingbird’s total displacement? Answer in...
  51. Science

    Conduction - energy is transferred through direct contact Convection - energy is transferred by the mass motions of molecules
  52. Physics

    A - A golfer takes two putts to sink his ball in the hole once he is on the green. The ?rst putt displaces the ball 8.10 m east, and the second putt displaces it 1.99 m south. What displacement would put the ball in the hole in one putt? Answer in units of m. -I got the answer...
  53. physics

    an airplane flying north is observed from the ground. it's velocity is 225 m/s north. the pilot who is flying the plane measures a velocity of 250m/s north. what is the velocity of the wind that affects the plane
  54. geometry

    line BD bisects angle ABC=8x. angle ABD=2x+22. find angle DBC
  55. Physics

    Yes? No?
  56. Physics

    So it would be .... 0=1274.49+2a(457) O=1274.49+914a?
  57. Physics

    A car is traveling at 80 miles per hour down a paved, asphalt road in good condition. The driver steps on the brake, decelerating at a constant rate (expressed in m/s^2), to avoid hitting a horse in the road 1500 feet away. If the driver does not wish to experience too rapid a...
  58. Engineering Mechanic

    a child throws a tennis ball vertically upwards at 7.7 m/s from ground level. assuming that no resistance force act on the ball, so that it move only under the influence gravity (9.81 m/s-²), what is the maximum heightin the tennis ball reaches
  59. Math

    Given A is (-2,3),Find point B,given their distance is 7 units
  60. Python Programming

    Does anyone have suggestions about books for a begineer to self study/get some basic to advanced knowledge on Python Programming? Hope someone who's familiar with this subject area,will help me. Thanks!
  61. Data Science

    I've been accepted into a General Physics degree programme in my country.If I'm willing to start my career as a data scientist,what subjects should I study at the university? Would the knowledge of programming languages will be an extra qualification or is that ...
  62. Math-2 column proofs

    Given m<1= 90 degrees,prove m<2 = 90 degrees.
  63. Math-2 column proofs

    Yes they do add up to a straight line with a bisector making each angle equal to 90 degrees
  64. Math-2 column proofs

    If <3 is congruent to <4,prove that <3 and <4 are right angles.
  65. Math

    Q1. Given that Angle OUR is congruent to Angle PUN and Angle OUR =2x+5,Angle RUN=4x-2 and Angle PUT= x+32,find the measure of Angle PUN Q2. Given that Angle TUN and Angle PUN are complementary angles and Abgle OUR = 4<RUP,what is the measure of Angle OUR.
  66. Math

    Q1. Given that Angle OUR is congruent to Angle PUN and Angle OUR =2x+5,Angle RUN=4x-2 and Angle PUT= x+32,find the measure of Angle PUN Q2. Given that Angle TUN and Angle PUN are complementary angles and Abgle OUR = 4<RUP,what is the measure of Angle OUR.
  67. Math

    Given that Angle OUR is congruent to Angle PUN and Angle OUR =2x+5,Angle RUN=4x-2 and Angle PUT= x+32,find the measure of Angle PUN
  68. Math

    Given that Angle TUN and Angle PUN are complementary angles and Abgle OUR = 4<RUP,what is the measure of Angle OUR. I swear this time this is all the information,I'm not skipping any info.
  69. Math

    Sorry about that.Thanks for the help. No I don't think all the answers are 7 but thanks though and sorry again about that
  70. Math

    SEN is a 90 degree angle
  71. Math

    EU bisects Angle SEN
  72. Math

    Given that ray EU is an angle bisector,find x given that <SEU=8x-11.
  73. Math

    Yes I am drawing them myself.The drawings help with the question.
  74. Math

    Thanks Damon!
  75. Math

    Given that Line segment CP is an angle bisector of <DPB and Line segment AB is perpendicular to line segment DP,find x given that <CPB=8x-11.
  76. Math

    There is no info missing
  77. Math

    Thanks John!
  78. Math

    Given that <APD=4x+123,<DPC=-5x-3 and <CPB=6x+105,find the measure of <DPC.
  79. Math

    OB is a ray
  80. Math

    Given ray OC is perpendicular to ray OA and <DOA=135 degrees,what would be the measure of <DOC given that <COB=3x-7 and <BOA= -2x+4.
  81. Math

    Given ray OC is perpendicular to ray OA and <DOA=135 degrees,what would be the measure of <DOC given that <COB=3x-7 and <BOA= -2x+4.
  82. Math

    I don't quite understand
  83. Math

    Given ray OC is perpendicular to ray OA and <DOA=135 degrees,what would be the measure of <DOC given that <COB=3x-7 and <BOA= -2x+4.
  84. Math

    No I'm sorry,would it be 15?
  85. Math

    Would x=13?
  86. Math

    if m<DOA=83 degrees , m<DOC=2x+4 , m<BOA=15 degrees.what would x need to be to make ray oc an angle bisector of <DOB
  87. Math

    Draw: 1)Line AB parallel to Ray CD perpendicular to line EF 2)Line GH perpendicular to line IJ,Line GH perpendicular to Line KL and Line IJ perpendicular to Line KL 3)Line Segment BC coplanar to Line TS
  88. Math

    Draw: 1)Line AB parallel to Ray CD perpendicular to line EF 2)Line GH perpendicular to line IJ,Line GH perpendicular to Line KL and Line IJ perpendicular to Line KL 3)Line Segment BC coplanar to Line TS
  89. Math

    I DONT KNOW I JUST THOUGHT THE ANSWER WAS ON HERE , SMHHH ; BUT SHOUTOUT TO KELSY FOR BEING MY FRIEND & DANIELLS BREGILI EATS BUTT
  90. Food

    I need to unscramble these 30 letters to make 5 words in a recipe. EAABCGBNREIDNASGSE AUNDALTIKELS
  91. Chemistry

    Actually the question is about identifying each other with O2
  92. Chemistry

    Can we use O2 to identify NO and SO2 from each other? Is it because NO+O2-->NO2; NO2 - brownish gas and 2SO2+O2--2SO3;SO3-blue in colour? Or what is the reason?
  93. Chemistry

    Thank you! And my brother uses the screen name Thomas and we access the site through the same device.
  94. Physics

    Thank you!
  95. Physics

    Why doesn't a magnetic force ALWAYS act on a particle which moves in a magnetic field?
  96. Chemistry

    A H atom is released from HIn so it is acidic?
  97. Chemistry

    Couldn't change the name.My sister was also using the PC to access this site
  98. Chemistry

    The indicator HIn has a dissociation constant of 1*10^-4 M. HIn<===> H30^+ + In^- Yellow Red When the pH value of the solution is 7, 1)the indicator shows the colour red 2)at this time most of the indicator has been dissociated Which statements are true? 1)I took this as...
  99. statistics

    2. In a survey of a large company, 30 percent of all employees are said that they are dissatisfied with their working conditions. Find the probabilities that among 12 randomly selected employee who were surveyed; a) None were dissatisfied with working conditions ( 4 marks) b) ...
  100. Science

    Strange but true. we can say that the earth is round but not exactly it is a spheroid i.e a sphere that is squashed at the poles and swollen at the equator I hope u like my answer and if it was an information to you please reply. Best regards:Anna
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