Posts by Iris

Total # Posts: 248

  1. vectors

    Thank you so much :)))
  2. vectors

    If |x| = 11, |y| = 23, and |x-y| = 30, find |x+y|. Textbook answer: 20
  3. science

    A weight of 500kg is suspended by two chains 1.5m and 2.7mrespectively.the chains are attached to a beam that is 3.746m in length. The distance from the suspension to the ground being 900m. A.Calculate the load. B.the vertical and horizontal reactions at the suspension points.
  4. Writing skills

  5. chem 11

    Chloroform, CHCl3, has a boiling point of 62 oC, whereas methane, CH4, has a much lower boiling point of -164 oC. Using diagrams, explain the difference between the two boiling points.
  6. Pre-Calculus

    The cost of sending a package overnight is $14.40 for the first pound and $3.90 for each additional pound or portion of a pound. A plastic mailing bag can hold up to 3 pounds. The cost f(x) of sending a package in a plastic mailing bag is given by the following function, where...
  7. Pre-Calculus

    Which of the following shows the correct notation for “The limit of x^2 - 1 as x approaches 3. A. lim x^2-1 x->3 B. lim3 x->x^2-1 C. lim(x^2-3) x->x^2-1 D. lim(x^2-1) x->3 Thank you
  8. Pre-Calculus

    What is the correct notation for “The limit of x^2 - 1 as x approaches 3? Thank you
  9. Pre-Calculus

    How does the expansion of (x + y)n and (x - y)n differ? If you can offer an example that would be very helpful. Thank you
  10. Pre-Calculus

    Find P_(k+1) if P_(k)=2^(k-1)/k! (I used _ as a sign for a subscript) A. 2^(k+1)/(k+1)! B. 2^k/(k+1)! C. 2^(k+1)/k!+1 D. 2k/k!+1 Thank you
  11. Pre-Calculus

    Which of the following shows the correct first step to prove the following by mathematical induction? 3 + 11 + 19 + 27 + … + (8n - 5) = n(4n - 1) A. 3 + 11 + 19 + 27 + … + (8 • 1 - 5) = 1(4 • 1 - 1) B. 8 • 1 - 5 = 1(4 • 1 - 1) C. 3 + 11 + 19 + 27...
  12. Pre-Calculus

    Find P + 1 if Pk = 7 + 13 + 19 + ...+[6(k - 1)+1] + (6k + 1) (the k+1 and k in front of the P are subscripts) A. 7 + 13 + 19 + …+[6(k - 1) + 1] + (6k + 1) + [6(k + 1) + 1] B. 8 + 14 + 20 + …+[7(k - 1) + 1] + (7k + 1) C. 7 + 13 + 19 + …+(6k + 1) D. 7 + 13 + 19...
  13. Pre-Calculus

  14. Pre-Calculus

    Can someone please explain how eccentricity can be used to classify conics.
  15. Calculus

    Use a graphing utility to graph the polar equation shown below. r = cos 5? + n cos ?, 0 ? ? ? ? For the integers n = -5 to n = 5. As you graph these equations, you should see the graph change shape from a heart to a bell. I'm sorry. I'm having issues with graphing this.
  16. English

    How is close reading related to annotation? How are they similar?
  17. Pre-Calculus

    Convert to rectangular: 4=4sec theta A. y=2 B. y=4 C. x=2 D. x=4
  18. Pre-Calculus

    Convert to rectangular: theta=(2pi)/3 A. y=-sqrt3 B. y=-sqrt3x C. x=sqrt3 D. x=-sqrt3y
  19. Pre-Calculus

    Convert to rectangular: theta=2pi/3
  20. Pre-Calculus

    Which are examples of the use of parametric equations? A. Position of a person on a ferris wheel. B. Position of a ball after being thrown. C. A and B D. Neither A nor B
  21. Pre-Calculus

    Which is the best example of the use of parametric equations? A. Measuring weight on the moon. B. Finding the position of a person in a city. C. Determining the position of a satellite during a specific time of day. D. Finding the right parameters to use for a construction ...
  22. Pre-Calculus

    Can you please give and example of a hyperbola and ellipse with the same vertices and center that I can graph? Then explain the similarities and differences between the graphs.
  23. Pre-Calculus

    given: ((x-2)^2/9)+((y-4^2/16)=1 what is the major axis?
  24. Texas History

    My answer is D
  25. Texas History

    Why did Santa Anna attack the Alamo? A. It had a supply of gold. B. It was an important strategic location. C. It was his family’s ancient homeland. D. It would ensure a glorious victory.
  26. Calculus

    Which of the following would be the best first step when solving the following system using the substitution method? x - y = -4 ; x + 2y = 5 a. x = -4 - y b. x = -4 + y c. 2y = 5 - x d. 2y = 5 + x
  27. Trig

    find the angle between u=7i+2j and v=-4j
  28. Calculus

    Given: u <-1, 7> and v <4, -3> What is the measure of the angle between them?
  29. Pre-Calculus

    Given: u <-1, 7> and v <4, -3> Find: (u • v)(u + v)
  30. Calculus

    Find the dot product of: <-1, 7> and <2, ¾>.
  31. Calculus

    What is the unit vector of v: <-6, -8>?
  32. Calculus

    Given the vectors u = <−3, 7> and v = <5,1>, find 3u + 2v.
  33. Trig

    Given tan(A) = 2 and A is in Quadrant I, find cos(2A). A. 0 B. 1 C. 1/2 D. -3/5
  34. Trig

    Just confused. Given tan(A) = 2 and A is in Quadrant I, find sin(2A). A. 0 B. 1 C. 1/2 D. 4/5
  35. Pre-Calculus

    Given Tan(A) = 5 in Quadrant III and Sin(B) = ⅔ in Quadrant II, find Cos(A-B).
  36. Pre-Calculus

    Given Sin(A) = ⅗ and Cos(B) = 8/17 in Quadrant I, find Sin(A+B).
  37. Pre-Calculus

    A.Verify the identity. B.Determine if the identity is true for the given value of x. Explain. [cot(x) – 1] / [cot(x) + 1] = [1 – tan(x)] / [1 + tan(x)], x = π/4 I solved A and I believe it's true; however, I need help with B.
  38. Pre-Calculus

    A.Verify the identity. B.Determine if the identity is true for the given value of x. Explain. Sec(x) / tan(x) = tan(x) / [tan(x) – cos(x)],x = π I already solved A and I believe it's true; however, I need help with B.
  39. Pre-Calculus

    This question has me stuck. Use the Pythagorean identity sin^2 Θ + cos^2 Θ = 1 to derive the other Pythagorean identities, 1 + tan^2 Θ = sec^2 Θ and 1 + cot^2 Θ = csc^2 Θ. Discuss how to remember these identities and other fundamental identities.
  40. History! Help!

    Yea! A. It created large populations
  41. History! Help!

    The Caddo were an American Indian group in Texas that practiced agriculture and build permanent houses. What can be inferred about the group? A. It created a large population B.It formed a small and defenseless population C.It had no contact with other groups D.It was nomadic ...
  42. History! Help!

    The Atakapans occupied the region from the Sabine river to the A. San Jacinto river B. Red river C. Colorado river D. Trinity river Both the Karankawa and Atakapans relied heavily on which resources? A.rival groups and shellfish C.settlers D.trees and nuts Both the ...
  43. History! Help!

    Is that right?
  44. History! Help!

    Well.... it would be A?
  45. History! Help!

    Which of the following lists the start of the agricultural revolution according to absolute chronology? A. AD 500 B. after hunting and gathering C. post-Spanish exploration D. 5000 BC
  46. Pre-Calculus

    Which of the following statements best describes the domain of the functions sine and arcsin? A)Sine domain is all real numbers; Arcsin domain is all real numbers. B)Sine domain is restricted; Arcsin domain is all real numbers. C)Sine domain is all real numbers; Arcsin domain ...
  47. Pre-Calculus

    Use a graphing utility to graph the function y = d + a sin (bx - c) for different values of a, b, c, and d. Write a paragraph describing the changes in the graph corresponding to changes in each constant.
  48. Pre-Calculus

    You are given the value of tan Θ. is it possible to find the value of sec Θ without finding the measure of Θ? Explain.
  49. Math

  50. Math

    opps i ment to put 1/2 sometimes it dosent work
  51. Math

    You read 50 pages in an hour. Your sister reads 40 pages in an hour. Explain how to find out how many more pages you read than your sister reads in 1212 hour?
  52. Social Studies

    The correct answer is B, abolish slavery by ratifying the thirteenth amendment and condemn the act of secession.
  53. health

    Trinity is correct, and 16 is B. Thanks Jake and Trinity. :)
  54. science !!

    The first one is D and the second one is B. Just took this, got 100%
  55. college algebra2

    a triangle whose base is 18 inches long has an area of 280 square inches. find the area of a similar triangle whose base is 6 1/4 feet long.
  56. Science

    Yes, the correct answer is definitely B, high altitude.
  57. Social Studies Help

    opps 1.A 2.B 3.C 4.A 5.D 6.B
  58. Social Studies Help

    1.A 2.B 3.C 4.A 5.A 6.D 7.B
  59. Social Studies Help

    The social unit most responsible for teaching the custom and traditions of a culture is? (A) The family (B) The government (C) The army (D) The schools Two important features of a culture are? (A) Weather and writing (B) Language (C) Economy and Climate (D) Natural resources ...
  60. Math

  61. Math

    I had chose B but i am not entirely sure
  62. Math

    Which number is equivalent to 14/4? A 3.2 , because 14 divided by 4 is 3 with a remainder of 2 B 3.5 because 14 divided by 4 is 3 with a remainder of 2 and 2/4 = 0.5 C 3.3 because 14 divided by 4 is 3 with a remainder of 3 D 3.6 because 14 divided by 4 is 3 with a remainder of...
  63. Science

    The answer is color.
  64. Health

    Thanks all! D False A 100%
  65. Science please help :)?

    Yes, those are the correct answers.
  66. Shalee ^~^

    Thanks bruh, you are correct. B C B A 100%
  67. Science

    The answers are: 4. A 12. B 15. C 16. B 17. C 19. A Trust me, 100%
  68. Math

    Hayden had 2 1/2 gallons of water in his watering can. The seed packet said to use 1/4 of a gallon for peppers and 5/8 of a gallon for tomatoes. Hayden then used some of the water for lettuce. If Hayden had 3/4 gallons of water left over, about how much water did he use for ...
  69. Science

    How can you evaluate scientific claims? NEED HELP!
  70. Science

    how can models help in science, why they are important, what and some examples of models.
  71. Math

  72. Physics

    An 83-kg fireman slides down a fire pole. He holds the pole, which exerts 500-N steady resistive force on the fireman. At the bottom he slows to a stop in 0.49 m by bending his knees. Determine the acceleration of the fireman while sliding down the pole.
  73. Art

    Do all art paintings have culture in the paintings
  74. Science

    that is better Thxs That really helps me
  75. Science

    the model at UTPA
  76. Science

    Need some help? How is the model of King Tut like other models used by scientists?
  77. LA

    what is the difference between internal conflict and external conflict Need help A.S.A.P
  78. 6th Grade Math :(

  79. 6th Grade Math :(

    about 4 hours
  80. Math

    oh ok i get it now
  81. Math

    i do not understand if it is 6% then is this explanation how you got 12%. which is it 6% or 12%
  82. Social Studies

    ok i will do it on my own good night
  83. Social Studies

  84. Social Studies

    ok srry my original question is Why did most major northeastern cities in the United States develop along the coast? and it does have why in the beggining
  85. Social Studies

    but i still do not get what reed means he says "The answer to "why" is "yes"
  86. Social Studies

    oh yeah
  87. Social Studies

    i do not get you reed
  88. Social Studies

  89. Social Studies

    is that right
  90. Social Studies

  91. Social Studies

    Why did most major northeastern cities in the United States develop along the coast?
  92. Social Studies

  93. Social Studies

    i know you all might be mad but i need help again here is the question What region of the United States did the first settlers arrive
  94. language arts

    i agree it is awesome but the ending i was just made
  95. Social Studies

    oh ok i get it
  96. Social Studies

    now is that right reed
  97. Social Studies

    that the expansion of the US throughout the American continents
  98. Social Studies

    is that right reed
  99. Social Studies

    the belief or doctrine, held chiefly in the middle and latter part of the 19th century
  100. Social Studies

    opps srry wrong name United States that American settlers were destined
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