# Lucina

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

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

3. ## Directions

What does N70 degrees E mean? Thank you

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

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

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.

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?)

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

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 A.to continue their way of life unchanged b to accept changes to the plantation system c. to change the souths borders d. to

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 =

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!

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

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

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.

15. ## Biology

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

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?

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

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

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

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!

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

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

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

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?

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

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

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??)

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

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

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

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

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

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

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

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!)

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?)

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

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.

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,

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) ---------------------------------------

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

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

43. ## Chemistry

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

44. ## Pre-Calculus

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

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

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

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

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!

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

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!

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

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!

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

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?

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)

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

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!

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

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.

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

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

62. ## Physics

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

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

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

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,

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 =)

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

68. ## Pre-Calculus

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

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

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 +

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

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

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 =

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)

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

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.

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

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

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

80. ## Physics

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

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

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

83. ## Measurement

Are SI measurements always larger than Imperial measurements?

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

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!

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

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)

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

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

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

posted on May 12, 2015
9. ## Sociology essay 1

posted on May 12, 2015

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