Lucina
Popular questions and responses by Lucina
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 
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 
Directions
What does N70 degrees E mean? Thank you
asked on March 5, 2015 
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 
PreCalculus
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 
PreCalculus
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 (t6)^2 +582 The maximum height will be 582 feet. 2.
asked on March 16, 2015 
PreCalculus (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 
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 
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
asked on December 4, 2016 
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 
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 
Precalculus (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 
Precalculus
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 
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 
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 
PhysicsCheck
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 
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 
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 
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 = vfvi / 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 
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 
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 
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 
PreCalculus (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 
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 grandsparents? Je LE visite ce weekend 4. Sa maison? Il LE loue 5. L'argent ? Je le depense facilement 6. Les disques classiques?
asked on May 6, 2015 
PreCalculus
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 
PreCalculus
Simplify the rational expression and then add or subtract. Express answers in simplest form and identify all nonpermissible values. (The nonpermissible value is not the issue. It is the simplification) 3x + 15/x^225 + 4x^2 1/ 2x^2 + 9x 5
asked on April 22, 2015 
PreCalculus
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 
PreCalculus (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 
Precalculus
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 
PreCalculus
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 
PreCalculus
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 
PreCalculus
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 
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 
PreCalculus
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= 25x24 Answer: 6x^2+25x24=0
asked on March 21, 2015 
PreCalculus
Determine a quadratic function with this set of characteristics. xintercepts of 2 and 7 and maximum value of 25 ( How would I find the xcoordinate for the vertex?) (Thank you!)
asked on March 17, 2015 
PreCalculus
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 
PreCalculus
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 
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 
Precalculus (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 
PreCalculus(Trigonometry)
An 8m 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 
PreCalculus ( 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 
PreCalculus
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 
Chemistry
Are halogens and nonmetals metal or nonmetals? I think they're both nonmetals
asked on February 16, 2015 
PreCalculus
If r = 1, will a sequence be convergent or divergent?
asked on February 15, 2015 
PreCalculus
Each second after shutoff, 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 
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 
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 
Algebra
What is the domain and range of the relation y = 2(x5)^2 + 8? Express in set notation.  Domain: x E R Range : y E R  Thanks!
asked on January 19, 2015 
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 
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 
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 
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 
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 EtatsUnis (Used for territories/provinces/states if I am correct...) 4. a + ville > a
asked on January 16, 2015 
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 
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 
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 
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 
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 
Polynomials
State whether the following equations are sometimes, always or never true. a) a^22abb^2= (ab)^2, bis not equal to 0 b) a^2+ b^2= (a+b)(a+b) c) a^2b^2= a^22ab+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 
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 
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 
Physics
A fallen tree if lifted 2.75m.What is the work done? W=Fd
asked on January 5, 2015 
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 
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 
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 
Precalculus ( 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 
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 
PreCalculus
Evaluate. 1200+2(5)^3 I get 49 as an answer
asked on May 6, 2015 
PreCalculus
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 
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 
PreCalculus
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 
PreCalculus
Have I converted correctly from standard form to vertex form? y = 3x^2 + 12x+1 = y = 3(x2)^2 13 Thanks
asked on April 13, 2015 
PreCalculus(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 14452 = 128 144128 = 16 a^2 =
asked on March 10, 2015 
PreCalculus
Determine a quadratic function in vertex form given each set of characteristics. * minimum value of 24 and xintercepts at 21 and 5 I have: (21,0) and (5,0) How would I find the xcoordinate of the vertex? (Thank you)
asked on March 10, 2015 
Precalculus
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 
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 
Precalculus
Are these two the same? Which one of those is the correct form? Sn = n [3n1] 2 Sn = 3n^2 +n  2
asked on February 7, 2015 
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 
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 
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 
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 
Personal Response (Poetry)
Hello, I am practicing personal responses to text, the poem I'm responding is called "When I was oneand 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 
Measurement
Are SI measurements always larger than Imperial measurements?
asked on January 11, 2015 
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 
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 
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 
AlgebraCheck 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 
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

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 
French
Thank you again :)
posted on June 7, 2015 
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 
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 
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 
English
Sorry, I could help you with the first bit. I think you are right about the first question
posted on June 1, 2015 
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 
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 
Sociology essay 1
You could be more specific. Then someone could help you!
posted on May 12, 2015 
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 
Math to hard please help
If that 4x^2? If so, that's correct :)
posted on May 12, 2015 
Math to hard please help
Yes, they are correct! :D
posted on May 12, 2015