Popular questions and responses by Lucina
  1. health

    1. When performing rescue breathing, be sure to always ________ the head before performing breaths. (1 point) level tilt push twist

    asked on May 8, 2017
  2. Trigonometry

    Hello! Explain why the primary trigonometric ratios depend only on the given angle and not the size of legs and hypotenuse of a right triangle? I am not 100% sure but it is because the angles have the same value for all of the ratios? Is it also because

    asked on January 17, 2015
  3. Directions

    What does N70 degrees E mean? Thank you

    asked on March 5, 2015
  4. ss

    1. What was one impact of the Iranian Revolution on the United States? (1 point) higher oil prices increased terrorism increased taxes increased military spending “Government is not the solution to our problems, government is the problem” --Ronald

    asked on May 4, 2017
  5. Pre-Calculus

    Water is spraying from a nozzle in a fountain forming a parabolic path. The nozzle is 10 cm above the service of the water. The water achieves a max height of 100 cm above the waters surface and lands in the pool. The water spray is again 10 cm above the

    asked on March 10, 2015
  6. Pre-Calculus

    1. A projectile is fired straight up from a height of 6 feet. Its height (h) in feet after t seconds is given by h = 6 + 192t -16t^2. Answer: h = -16t^2 + 192t + 6 h = -16( t^2 -12t +36) + 6 +576 h = -16 (t-6)^2 +582 The maximum height will be 582 feet. 2.

    asked on March 16, 2015
  7. Pre-Calculus (Trigonometry)

    An angle in standard position such that sinÈ = 5/13. Determine the possible values of È, to the nearest degree. Answer: I got 23°. (How do I get the second one?)

    asked on February 22, 2015
  8. French

    Bonjour! 1. Can you tell me if I wrote this in passé compose correctly? I'd also appreciate an explain as to when you should use avoir / étre! a) Je suis bois de l'eau b) It est mange un pizza. c) J'ai visité ma mere. 2. Have I written this in futur

    asked on January 20, 2015
  9. SS

    "We seek no conquest. All we ask it to be left alone According to this quote which statement best summarizes the souths agenda continue their way of life unchanged b to accept changes to the plantation system c. to change the souths borders d. to

    asked on December 4, 2016
  10. Physics

    Canadian geese move up and down on the surface of a lake. If one moves up and down 15 times a minute and you estimate the distance between the wave crests to be 1 m, determine the speed of the water F = rpm F = 15/60 F = .25 V = wavelength * Frequency v =

    asked on July 26, 2015
  11. Earth science

    Hello! Does Jiskha have Earth Science tutors? If not, could someone direct me to a site where I could ask for help? My questions regard finding out specific heat capacity and heat of fusion and heat of vapourization of water. Thank you!

    asked on June 1, 2015
  12. Pre-calculus (Trigonometry)

    The rotating spotlight from the Coast Guard ship can illuminate up to a distance of 250 m. An observer on the shore is 500 m from the ship. HIs line of sight to the ship makes an angle of 20 degrees with the shoreline. What length of shoreline is

    asked on February 27, 2015
  13. Pre-calculus

    Hello, Consider a geometric sequence with t3= 18 and t7= 1458. Are there one or two values for the common ratio? How does this affect the sequence (I got one, but the way this question mentions 2 ratios, I get the feeling there are 2 values.) My work: 1458

    asked on February 12, 2015
  14. Practice Exams?

    Does anyone know a website or a book where I have some General Cognitive Ability Tests/ Standardized Exams for free? The sites I found are not what I was looking or were asking me to pay.

    asked on February 2, 2015
  15. Biology

    Is xylem or phloem larger in a plant? My answer is xylem is larger in a plant than phloem.

    asked on January 19, 2015
  16. Physics-Check

    In a marathon race, one runner is moving at 5.0 m/s passes a second runner moving at 4.5. What is the distance between the runners 10 minutes after the one runner has passed the other? 5m?

    asked on January 12, 2015
  17. Physics

    What is the difference between scalar and vector quantities and what two methods are used to describe vectors? Answer: Scalar quantities measure only distance (speed) while vector quantities measure both distance and direction, ( which is specifically

    asked on January 6, 2015
  18. Physics

    Hello! I am having trouble figuring out the answer for this question: A 60 kg water skier is being pulled behind a boat. If the propulsive force applied by the 500 kg boat is 2.50 * 10^3 N, determine the acceleration of the skier and tension force in the

    asked on July 11, 2015
  19. Physics (Kinematics Check)

    What is the average velocity of a dropped brick that falls 4.0 m? vi = 4.0 m/s vf = 0 m/s a = 9.81 m/s^2 t = vf-vi / a t = -4/9.81 t = 0.41 s v = d/t v = 4.0/0.41 v = 9.81 m/s^2

    asked on July 8, 2015
  20. Writing

    Hello! For critical essays analyzing literature, is it better to analyze one text or can it done with more than one text? Thank you!

    asked on June 15, 2015
  21. French

    Bonjour Sra! I was unable to reply to your answer over the past few days. I finally had the chance to check this out today. I had initially used your suggestions but when my teacher read it she told me since my actions were habits, I should use the

    asked on June 1, 2015
  22. French

    Bonjour! Have I written the following sentences correctly? 1. J'adore le pasta. Je le mangeions chaque semaine ( I like pasta. I eat it every week) 2. J'aime lire le livre. Je le lisais chaque jour ( I like to read. I read everyday) 3. Je déteste les

    asked on May 28, 2015
  23. Pre-Calculus (absolute values)

    I want to find the invariant points( points that are fixed) algrebraically of x^2 - 25 and its reciprocal. Would I set up my equation like this? 0 = x^2 -25 or 0 = 1/ x^2 - 25 Thanks

    asked on May 12, 2015
  24. Francais

    Remplacez les tirets par le, la , l' ou les 1. Georges? Il LE aime beaucoup 2. Les oeuf frais? On LES vend au marche 3. Mes grands-parents? Je LE visite ce week-end 4. Sa maison? Il LE loue 5. L'argent ? Je le depense facilement 6. Les disques classiques?

    asked on May 6, 2015
  25. Pre-Calculus

    Two hoses together fill a pool in 2 h. If only hose A is used, the pool fills in 3 h. How long would it take to fill the pool if only hose B were used? I multiplied 3 and 2 and got 6 hours. Is this a valid method? Thanks

    asked on April 25, 2015
  26. Pre-Calculus

    Simplify the rational expression and then add or subtract. Express answers in simplest form and identify all non-permissible values. (The non-permissible value is not the issue. It is the simplification) 3x + 15/x^2-25 + 4x^2 -1/ 2x^2 + 9x -5

    asked on April 22, 2015
  27. Pre-Calculus

    A sailboat in a lake travels 4 km due north and then 4 km due west. From there, the boat travels 5 km due north and 4 km due west. How far is the bboat from the starting point? Express your answer as a mixed radical. (How would I use radicals for this??)

    asked on April 19, 2015
  28. Pre-Calculus (Check)

    Please tell me what I'm doing wrong... The side lengths of tops of three squares tables can be described as three consecutive integers. The combined area of the table tops is 677 sq in. Algebraically, determine the roots of the quadratic equation. (I'll

    asked on April 14, 2015
  29. Pre-calculus

    Can someone please help me with this problem.. I don't get it! Solve (sqrt 5r - 9)-3 = sqrt(r+4)-2

    asked on April 11, 2015
  30. Pre-Calculus

    Convert from standard to vertex form: (x+5)(x+4) x^2+ 9x + 20 (x+3)^2 + 20 - 9 (x+3)^2 + 11

    asked on April 6, 2015
  31. Pre-Calculus

    Solve 0 = 3x^2 + 5x -1 by completing the square. Express your answer as exact roots. 3(x^2 + 5/3 + 25/36) = -1 (x+ 5/6)^2 = 37/36 sq root( x + 5/6)^2 = sq root (37/36) x + 5/6 = +- sq root 37/6 x = -5/6 +- square root 37 /6

    asked on March 26, 2015
  32. Pre-Calculus

    Solve. Express your answer as exact roots. (s+6)^2 = 3/4 Sq root (s+6)^2 = +-sq root 3/4 (s+6) = sq root 3/ 2 s = -6 +- sq root 3 ----------------- 2 (The answer according to the textbook is (-12 +- sq root 3)/2. What error have I made?) Thank you

    asked on March 25, 2015
  33. English (writing)

    Hello! I have to write an essay a critical paragraph/essay tommorrow on the following topic: In the first half of the novel, the author uses the idea of gender identity and societal expectations. In what way does the author use the character of Scout to

    asked on March 24, 2015
  34. Pre-Calculus

    Rewrite each quadratic equation in the form ax^2+bx+c=0. Then,use technology to solve each by graphing. ROund you answers to the nearest hundredth, where necessary. a) 3x^2+30 = -19x Answer: 3x^2+19x+30 Roots: x = -3 b) 6x^2= 25x-24 Answer: -6x^2+25x-24=0

    asked on March 21, 2015
  35. Pre-Calculus

    Determine a quadratic function with this set of characteristics. x-intercepts of 2 and 7 and maximum value of 25 ( How would I find the x-coordinate for the vertex?) (Thank you!)

    asked on March 17, 2015
  36. Pre-Calculus

    How many parameters in a quadratic function in a vertex form change when you change the location of the vertex? ( P and Q change? The value of the coefficient( a ) may also change?)

    asked on March 14, 2015
  37. Pre-Calculus

    One walker was sponsored $100 plus $5 for the first kilometre, $10 for the second kilometre, $15 for the third kilometre, and so on. How far would this walker need to walk to earn $150? (I know it is 4 km, but I can't figure out how to write the general

    asked on March 11, 2015
  38. Trigonometry

    Three oil platforms, Alpha, Beta and Gamma are situated in the North Sea.Beta is 12 km from Alpha and is on a bearing of 145 degrees from Alpha.Gamma is 16 km from Alpha and is on a bearing of 220 degrees from Alpha.Find the distance of Beta from Gamma.

    asked on March 9, 2015
  39. Pre-calculus (trigonmetry)

    The Bermuda Triangle is an unmarked area in the Atlantic Ocean where there have been reports of unexplained disappearances of boats and planes and problems with radio communications. The triangle is an isosceles triangle with vertices at Miami, Florida,

    asked on March 3, 2015
  40. Pre-Calculus(Trigonometry)

    An 8-m boom is used to move a bundle of piping from point A to point B. Determine the exact vertical displacement of the of the boom when the operator moves it form 30 degrees to 60 degrees. (Just need work checked) ---------------------------------------

    asked on February 24, 2015
  41. Pre-Calculus ( Trigonometry)

    The point P(k, 24) is 25 units from the origin. If P lies on the terminal arm of an angle, theta, in standard position, 0 < theta < 360,determine the measure of theta. Unsure how to go on from here. I'd appreciate if someone can guide me through the first

    asked on February 24, 2015
  42. Pre-Calculus

    Q.Determine the sum of each infinite geometric series. t_1= 8 r = -2^1/2 ---------------------------------------- A.This is a divergent series because the absolute value of r is greater than 1. ---------------------------------------- Q. The first term of

    asked on February 17, 2015
  43. Chemistry

    Are halogens and non-metals metal or non-metals? I think they're both non-metals

    asked on February 16, 2015
  44. Pre-Calculus

    If r = 1, will a sequence be convergent or divergent?

    asked on February 15, 2015
  45. Pre-Calculus

    Each second after shut-off, the speed of the blade is 2/3 of the speed in the previous second. After the first 8 s, the saw has turned 258 times. What was the speed of the saw before the motor shut off, to the nearest tenth of a turn per second? I get

    asked on February 13, 2015
  46. English

    In to Kill A Mockingbird, what happened to Dill's father? At the beginning Dill mentions he didn't have a father but when Scout pressures him he says his father is not dead. Later, he mentions his father owning the railway ( a story that he made up?). I do

    asked on February 10, 2015
  47. French

    * Note to Sra: I saw your replies to my previous post. They were very useful! I am posting a new question as the questions are a different topic.* Can you please check if I have written these sentences correctly in the affirmative form? I believe that

    asked on January 21, 2015
  48. Algebra

    What is the domain and range of the relation y = 2(x-5)^2 + 8? Express in set notation. --------------------------------------- Domain: x E R Range : y E R --------------------------------------- Thanks!

    asked on January 19, 2015
  49. Algebra

    Write the simplified form of the expression. {q^-2/3} {q^1/3} --------------- q^4/3 Using positive exponents. ------------------------------------- Solution: {q^-2/3} {q^1/3} = q^-1/3 = 1 --------------- ------ ---- q^4/3 q^4/3 q^5 Thanks in advance

    asked on January 19, 2015
  50. Physics/Math

    Determine the missing value. a) Output value/Efficiency: 100 J Efficiency: 100% Input E = ??? b) Input: 100 J Efficiency: 30% Output E = ?? Output= 30 J c) Output E: 120 000 J Efficiency: 2% Input E= ?? How would I solve for the put value? Thank you!

    asked on January 19, 2015
  51. Physics

    A 50 g lunch pail is lifted up 500 m. If the work required to do this was 1450 J, what's the acceleration? W= mad 1450 = (0.05 kg)(a)(500m) 1450 = 250a 5.8 m/s^2 = a If a 750 g mass is accelerated at a rate of 11.0 m/s^2 for a distance of 3.0 m, how much

    asked on January 18, 2015
  52. Chemistry

    Can someone please tell me what to expect from Beginner High School chemistry? Is it mostly applying mathematics like physics? Or basically memorizing like biology? Thank you!

    asked on January 17, 2015
  53. French

    Bonjour! Are the following examples les adjectifs de nationalite? 1. en + pays feminin --> Exemple: en Chine 2. au + pay masculin --> Exemple: au Canada 3. aux -> aux Etats-Unis (Used for territories/provinces/states if I am correct...) 4. a + ville --> a

    asked on January 16, 2015
  54. General/Academics

    If I have an 85% in a course, what mark would I need to raise to an 89+ if my final is worth 25% of the whole course?

    asked on January 14, 2015
  55. Creative Writing

    ( I have to do either a creative or personal response to a visual. I have chosen to do a personal response in the form of an essay. Obviously, I can't show the visual but I can describe it: A man in a swimsuit is jumping out of rough cliffs ( not in focus)

    asked on January 13, 2015
  56. Geometry

    I realize I'll get a reply in the morning so... A squash ball must have a diameter either 0.5 mm either above or below 40 mm. a) What is the minimum and maximum surface area of a squash ball? Express answer to nearest square millimetre. Minimum: 4902

    asked on January 12, 2015
  57. Geometry

    A hand drum has a diameter of 14 7/8 inches and is 3 in deep. What is the amount of hide needed if the hide only covers top and lateral faces? *what are lateral faces? Thanks!

    asked on January 12, 2015
  58. Geometry

    Find the radius of a cylinder with a volume of 393.3 cm^3 and a height of 3cm V = pi*r^2*h 393.3 = pi*r^2*h 41.75 cm = r^2 6.5 cm = r

    asked on January 11, 2015
  59. Polynomials

    State whether the following equations are sometimes, always or never true. a) a^2-2ab-b^2= (a-b)^2, bis not equal to 0 b) a^2+ b^2= (a+b)(a+b) c) a^2-b^2= a^2-2ab+b^2 d) (a=b)^2 = a^2+2ab+b^2 I don't understand what these questions are exactly asking.

    asked on January 10, 2015
  60. English

    What is the purpose of Lord Capulet arranging Juliet's marriage to Paris so suddenly after Tybalt's death? It is obviously to speed up the action in the play and give Friar Lawrence and Juliet to find some way to bring Romeo back to Verona, however, is

    asked on January 6, 2015
  61. Physic Worksheets?

    Hi! I have a few tests coming up and I need some practice Physics worksheet/tests. I have already done the worksheets and previous tests, but I still need more practice. Does anyone know a site that I can get some practise problems? Doing a google search

    asked on January 6, 2015
  62. Physics

    A fallen tree if lifted 2.75m.What is the work done? W=Fd

    asked on January 5, 2015
  63. Physics

    1) On the construction site an electric crane is used to lift materials to the 10th floor. A 180 kW motor requires 2.0 minutes to lift a 10500 kg load if bricks 218 m. How efficient is the crane? 2. Burning 1.0 kg of coal releases 33 MJ of energy. This

    asked on December 31, 2014
  64. Physics

    Hi! Would one of you please check my work? Thanks! ( I used significant digits, by the way) A student throws a 5.00 kg steel shot directly upwards so that it leaves his hand when it is 2.00 m above the ground. If its velocity is 0.15 m/s when it leaves his

    asked on December 29, 2014
  65. French

    Bonjour! Are these sentences grammatically correct? 1. J’étais trés réservée. C’était une bonne chose, parce que je n’ai jamais eu des problémes pour parler. Mais il était difficile de se faire des amis (I was very quiet. It was good thing,

    asked on June 7, 2015
  66. Pre-calculus ( Absolute value)

    Why does |7 + 3x| = x -1 have no solution? I could plug in, for example 5, and the answer would be positive. Thank you =)

    asked on May 10, 2015
  67. Writing

    In the novel, To Kill a Mockingbird by Harper Lee, a major character, Jem's view on the world shifts drastically due to his experiences with his hometown Does this sentence sound awkward? If so, how can I make this sentence flow more smoothly? Thank you

    asked on May 7, 2015
  68. Pre-Calculus

    Evaluate. 1-|200+||-2|(-5)^3|| I get 49 as an answer

    asked on May 6, 2015
  69. Pre-Calculus

    Can the following be reduced any further? 14x^2/56y^3 I did not reduce because there were different variables in the numerator and denominator. Thanks

    asked on April 22, 2015
  70. Chemistry

    Can someone please check if I have written and balanced the reaction properly? 1.In 1774 Joesph Priestley discovered oxygen by decomposing the oxide of mercury. 2HgO = 2 Hg + O2 2. Slaked lime precipitates magnesium ions from hard water. Ca(OH)2 +

    asked on April 20, 2015
  71. Pre-Calculus

    The equation H(t) = 30 + 24t - 6t^2 describes the height of a ball at any time t. What's the height of the ball after two seconds h = 30 + 24(2) + 6(2)^2 h = 30 + 48 -24 h = 54 units Therefore, the maximum height is 54 units

    asked on April 13, 2015
  72. Pre-Calculus

    Have I converted correctly from standard form to vertex form? y = -3x^2 + 12x+1 = y = -3(x-2)^2 -13 Thanks

    asked on April 13, 2015
  73. Pre-Calculus(Trignometry)

    There are 3 airports, A , E and G. G is 200km from A.E is 160 km from A From G the bearing of A is 052 degrees. From A the bearing of E is 216 degrees. What's the distance between A and G? 360- 216 = 144 144-52 = 128 144-128 = 16 a^2 =

    asked on March 10, 2015
  74. Pre-Calculus

    Determine a quadratic function in vertex form given each set of characteristics. * minimum value of -24 and x-intercepts at -21 and -5 I have: (-21,0) and (-5,0) How would I find the x-coordinate of the vertex? (Thank you)

    asked on March 10, 2015
  75. Pre-calculus

    Find the first two terms of a geometric sequence if t_3+ t_4 = 50 and t_4 + t_5 =100? t3= a(r^2) t4= a(r^3) t5= a(r^4) a(r^2)+ a(r^4)= 100 ------------------------- a(r^3)+ a(r^4) = 50 ar^3 ----- = 2 ar^2 r = 2

    asked on February 17, 2015
  76. Chemistry

    Can someone please explain to me what was John Dalton's experiment that led to his atomic theory? I know it's the electrolysis of water, but I'd appreciate if someone could explain in detail.

    asked on February 15, 2015
  77. Precalculus

    Are these two the same? Which one of those is the correct form? Sn = n ---[3n-1] 2 Sn = 3n^2 +n ------- 2

    asked on February 7, 2015
  78. Algebra

    Factor 3x^3 + 9x^2 - 3x - 9 3x^3 + 9x^2 - 3x - 9 3 (x^3 + 3x^2- x - 3) 3 ( x+3x^2) ( -x - 3) 3 {x( 1 + 3x) -1 (x -1) This is a far I have gotten. Can someone please help me through the rest of the answer? Thank You

    asked on January 23, 2015
  79. Algebra

    Solve this system of linear equations. * Used the substitution method 3x - y = 8 4x - y = -15 ----------------------------------------- WORK y = 3x - 8 4x - (3x - 8 ) = -15 4x - 3x + 8 = -15 x + 8 = -15 x = -7 3x - y = 8 3(-7) - y = 8 -21 - y = 8 -y = 29 y

    asked on January 20, 2015
  80. Physics

    Negating air resistance, a block weighing 1.0 kg will fall _________ a 3.0 kg block Answer: The same rate as

    asked on January 19, 2015
  81. Physics

    A old Chevy accelerates at a rate of 3.8 m/s^2. How much time would it take to reach the speed limit of 100 km if the car was travelling at the speed of 70.0 km? a) 2.9 s b) 3.7 s

    asked on January 18, 2015
  82. Personal Response (Poetry)

    Hello, I am practicing personal responses to text, the poem I'm responding is called "When I was one-and twenty" by A.E.Housen. The question I must discuss is : " How does the text suggest that are choices affect the person we become?" I know some of the

    asked on January 14, 2015
  83. Measurement

    Are SI measurements always larger than Imperial measurements?

    asked on January 11, 2015
  84. Polynomials

    The circular area of the drum is (9x^2+30x+25)pi. What is the smallest diameter it can have? (9x^2+30x+25) (3x+15) (3x+15) 3(x+5) 3(x+5) 9(x+5) 9x+45

    asked on January 10, 2015
  85. French

    Are these sentences correct? Il travaille sur mardi Ils dessinent un maison Elles travaillent mecredi Elles commencent les devoirs. Nous arrivons nous maison Ils arrivent nous maison Tu es aides moi. Merci!

    asked on January 8, 2015
  86. Algebra

    (I skipped the lengthy work problem background as it is irrelevant) The number of bacteria needed to break down an oil spill is 1000000 per millitre of oil. The bacteria double in number every two days.The starting concentration of bacteria is 1000

    asked on December 31, 2014
  87. Algebra-Check my answer please!

    The Great Galaxy in Andromeda is about 2200000 light years from Earth. Light travels 5900000000000 miles in a year. How many miles is the Great Galaxy in Andromeda from Earth? I got 1.298* 10^20 miles. (This is the exponents unit)

    asked on December 31, 2014
  88. Physics

    Hello! A falling piano reaches a velocity of 120 km/h. Find the kinetic energy if the mass of the piano is 357 kg. Ek= 1/2mv^2 Ek= 1/2(357)(33m/s)^2 Ek= 194386.5 J The problem is that my answer key has the answer 208kJ. What's my error? I have tried this

    asked on December 27, 2014
  1. Math

    Tricycles : Tricycle Wheels 1 : 3 x : 6 x/ 6 = 1/3 (Cross multiply to get:) x = 6/3 x =2 Therefore there are 2 tricycles

    posted on July 7, 2015
  2. French

    Thank you again :)

    posted on June 7, 2015
  3. French

    Thank you :) I am not sure about these revisions, could you see if I am on the right path? 1. C’était une bonne chose, parce que je n’ai jamais eu des problème de parler. Mais il était difficile me faire des amis 2. J’avais un éléphant violet.

    posted on June 7, 2015
  4. French

    Sra, there was a misunderstanding between me and me teacher. I had accidently mixed up the JE and Nous forme! Thanks for helping :D

    posted on June 3, 2015
  5. French

    The assignment was to translate two sentences about what you used to do . I apologize, I should have been more clear about that. The example my teacher had given me was: Je le mangeions chaque semaine. She told me that I had to take "manger" and add

    posted on June 1, 2015
  6. English

    Sorry, I could help you with the first bit. I think you are right about the first question

    posted on June 1, 2015
  7. English

    This book is Night by Elle Wiesel. I haven't read all of it so I can't help you :( Sorry!

    posted on June 1, 2015
  8. Math to hard please help

    No. DrBob just said in his post above that 4x^2 - 3x^2 = x^2

    posted on May 12, 2015
  9. Sociology essay 1

    You could be more specific. Then someone could help you!

    posted on May 12, 2015
  10. Math to hard please help

    Like terms are terms that have the same degree (power) so x^2 have the same degree. Combine the two by subtracting 4 and 3 The x's are a like term. Check if there are any like terms in the second equation Same as above for the constants(-3 and 5) (I would

    posted on May 12, 2015
  11. Math to hard please help

    If that 4x^2? If so, that's correct :)

    posted on May 12, 2015
  12. Math to hard please help

    Yes, they are correct! :D

    posted on May 12, 2015