Celina
Most popular questions and responses by Celina
Mathematics
Twelve man take 6 hours to finish a piece of work. After the 12 men have worked for 1 hour, the contractor decides to call in 8 men so that the work can be completed earlier. How many more hours would 20 men take to complete the remaining work?
asked on May 28, 2012 
chemestry
write a chemical equation for an atom losing a third electron. would the ionization energy for this reaction be larger or smaller that the ionization energy for the lloss of the first or second electron? explain
asked on March 22, 2011 
Physics, please help:)
A charge rod is brought near a pile of tiny plastic sphere. Some of the spheres are attracted to the rod, but as they touch the rod, they are flung into different directions. Explain. Thanks :)
asked on September 1, 2012 
Math important!!!
Samantha is a baseball player, she has a batting average of 0.280. a) find the probability that at least 3 hits in her next 5 times at bat (12 marks) b)what is Samantha's expected number of hits in her next 10 times at bat? (3 marks)
asked on July 11, 2013 
Algebra
Here's another problem I'm having a little trouble with: A piece of string is 40 cm long. It is cut into three pieces. The longest piece is 3 times as long as the middlesized piece, and the shortest piece is 23 cm shorter than the longest piece. Find the
asked on November 14, 2008 
chemestry grd 11
A typical soap molecule consists of a polyatomic anion associated with a cation. The polyatomic anion containd hydrogen, carbon & oxygen. One particular soap molecule has 18 carbon atoms. it contains 70.5% carbon, 11.5% hydrogen, and 10.4% oxygen by mass.
asked on May 1, 2011 
Science
The device shown below contains 2 kg of water. When the cylinder is allowed to fall 250 m, the temperature of the water increases by 1.4°C. Suppose 2 kg of water are added to the container and the cylinder is allowed to fall 750 m. What would the increase
asked on March 18, 2018 
Algebra
Here are two more problems I have for homework tonight. I have gotten answers, but I used "guessandcheck" and could not find an equation like I am supposed to. If you answer, please tell me if my answer is correct, walk me through your way of solving it,
asked on October 29, 2008 
Math
"Find the area of a rhombus with sides of length 10 in. and longer diagonal of length 16 in." and Also, how do you solve the problem "Find the area of a regular decagon with radius 4 cm."
asked on June 9, 2013 
Math grd12
Gisela lives in a subdivision where the streets are laid out in a grid pattern. Her school is eight blocks south and six blocks east of her home. How many different direct routes could she take when she bicycles to school if she always stops by her
asked on November 21, 2010 
Chemistry
What is the length of a string that has a standing wave with four nodes (including those at the ends) and lambda = 24 {\rm cm}
asked on May 17, 2010 
Math
A picnic cooler contains different types of cola.12 regular, 8 cherry, 6 diet, 8 caffeine free, 10 diet vanilla, and some diet cherry. U pick a can of cola without looking at its type. There is a 44% chance that the drink selected is diet. How many diet
asked on July 10, 2013 
Family Consumer Sciences
One of the questions on a worksheet I must answer is this: You're in study hall and trying to get your homework finished. The students next to you continue to talk and interfere with your concentration. What should you do? You are supposed to put your own
asked on December 1, 2008 
Math grd12
How many arrangements of five letters from the word 'certain' contain the letter 't'? Explain your reasoning.
asked on November 21, 2010 
Physics
A ray of light enters a glass block from air at an angle of incidence of 50 degrees. The angle of refraction is 30 degrees. What is the refractive index of the glass? What is the value of critical angle for this glass? Thank you :)
asked on April 7, 2012 
Chemistry
How many mL of .715 M HCI is required to neutralize 1.25grams of sodium carbonate? (Producing carbonic acid)
asked on March 27, 2013 
math
A 12foot tree casts a 22foot shadow. Find the angle of elevation from the tip of the shadow to the top of the tree. Round the answer to the nearest tenth.
asked on October 7, 2014 
AdvertisingHELP
I need an advertisement which hasn't been banned yet, but that you think should be banned. I don't really pay attention to ads, so I don't know which ones should be banned. I actually have to write a complaint letter on one.
asked on February 21, 2011 
trig
prove that: sinC+sinD =2sin((C+D)/2)*cos((CD)/2)
asked on December 8, 2013 
chemistry
a chemical reaction occuring in a cylinder equipped with a moveable piston produces 0.58 mol of a gaseous product. If the cylinder contained 0.11 mol odf gas before the reaction and had an initial volume of 2.1 L, what was its volume after the reaction
asked on May 15, 2011 
More algebraplease help!
Here are some more questions I'm having trouble with. Please walk me through them so I can fully understand them. #2: Let A be (5,9), B be (3,5), and C be (1,1). The median of a triangle connects a vertex of a triangle to the midpoint of the opposite
asked on December 17, 2008 
Algebra
Please help!!! I have a worksheet of problems to do for homework, most of which I don't understand. My teacher hasn't really been answering my questions well. We are supposed to write equations, but if you have another way, that is fine, too. If you know
asked on October 28, 2008 
Physics
A charge rod is brought near a pile of tiny plastic sphere. Some of the spheres are attracted to the rod, but as they touch the rod, they are flung into different directions. Explain. Thanks :)
asked on August 31, 2012 
Math grd 12
The number of nuts in a package of Nutty's premium cashews is normally distributed with mean of 432.4 nuts and standard deviation of 5.8 nuts packages with fewer than 420 nuts or more than 445 nuts will be rejected by quality control a) what is the
asked on January 19, 2011 
Algebra
Right now we are learning about functions, relations, etc. and I am kind of confused. Here is what I have to answer: Determine whether each of the following is a function. Identify any relations that are not functions. Domain A set of avenues
asked on December 4, 2008 
business
prepare an argument opposing the following statement: "The first priority of any business is to its shareholders. It is not environmental protection that is the role of government" i need some starter points to get me started on this question, thanks
asked on March 11, 2014 
Algebraplease help!
Here are some more questions I'm having trouble with. Please walk me through them so I can fully understand them. #2: Let A be (5,9), B be (3,5), and C be (1,1). The median of a triangle connects a vertex of a triangle to the midpoint of the opposite
asked on December 17, 2008 
Algebra
Here is my question: If (2, 3) and (5, 4 are the endpoints of a diagonal of a square, what are the coordinates of the other two vertices? I got (2,3) and (5,4). But the other question was: What is the area of the square? How would you find this? Do you
asked on December 2, 2008 
Algebraplease help!
I really need help with my math homework today, because I am totally confused! Please give me the answer, but also walk me through it, too, so I can fully understand it, because just the answer won't really help. #1: A math teacher wants to curve a set of
asked on December 17, 2008 
Algebra
Here is my problem. Please walk me through how you got to the answer. Threefourths of a number equals 3 times the number increased by 9. Is this the correct equation? 3/4n = 3n + 9 Here's another. In this one, does "is" mean "equals"? Onefourth of a
asked on November 14, 2008 
maths
from a batch of 10 eggs 3 are rotten.2 eggs are selected in succession.Find the probability that(a)both are rotten (b)only 1 is rottewn and at least 1 is fresh. b) Probability(1rotten, 1fresh)=3/10*7/9 Notice how the probabality after drawing one rotten,
asked on June 6, 2007 
Algebra! Help needed!
I'm having a little trouble with this problem... Please try and walk me through the problem, too: #1. A motorboat leaves a dock and travels at an average speed of 15 mi/h toward an island. The average speed on the return trip is 10 mi/h. How far is the
asked on November 20, 2008 
Math
Find the probability that a number chosen at random between 1 and 100 is divisible by 2 and 7.
asked on July 10, 2013 
chemestry grd 11
indigo C16H10N2O2 (numbers are suppose to b as a subscript) is the common name of the dye that gives blue jeans their characteristic colour. Calculate the mass of oxygenin 25.0g og indigo. show your work.
asked on May 1, 2011 
Mathematics .
I need some help with this specific question. In a computer catalog, a computer monitor is listed as being 19 inches. This distance is the diagonal distance across the screen. If the screen measures 10 inches in height, what is the actual width of the
asked on March 9, 2011 
AdvertisingHELP
I need an advertisement which hasn't been banned yet, but that you think should be banned. I don't really pay attention to ads, so I don't know which ones should be banned. I actually have to write a complaint letter on one. AdvertisingHELP  Kate,
asked on February 21, 2011 
Math grd 12
You are setting a system programing codes for a universal TV remote control. Each code will have five digits and cannot include a 0 or repeat any digits. How many codes a)do not contain a 7? b)have 3 as the third digit, and 5 as the fifth digit c)begin
asked on November 21, 2010 
Algebra
I'm having a little trouble with this problem... Please try and walk me through the problem, too: #1. A motorboat leaves a dock and travels at an average speed of 15 mi/h toward an island. The average speed on the return trip is 10 mi/h. How far is the
asked on November 20, 2008 
biology
1.identify the 2 major reservoirs of carbon dioxide into the atmosphere 2.what are the forms in which carbonis found n the oceans Since this is not my area of expertise, I searched Google under the key words "carbon dioxide reservoirs atmosphere" to get
asked on September 26, 2006 
MATHS
a bag contains 8 identical balls of which 5 are yellow and 3 are white.1 ball is removed,its colour is noted and is replaced in the bag.a second ball is drawn.by drawing a table,find the probability(a)both balls are yellow(b)both are white (c)only 1 is
asked on June 6, 2007 
Data management gr.12
Find the probability that a number chosen at random between 1 and 100 is divisible by 2 and 7.
asked on July 10, 2013 
college math
loverdaleNurseries obtained a $60,000 loan at 7.5% compounded monthly to build an additional greenhouse. Construct a partial amortization schedule for payments of $1000 per month (except for a smaller final payment)showing details of the first 2 payments.
asked on November 6, 2012 
calculus
Write the definite integral for the area of the region bounded by the grpahs of y=9x^2 and y=0
asked on December 18, 2011 
chem
indigo C16H10N2O2 (numbers are suppose to b as a subscript) is the common name of the dye that gives blue jeans their characteristic colour. Calculate the mass of oxygenin 25.0g og indigo. show your work.
asked on May 1, 2011 
Math grd 12
How many different sevendigit telephone numbers are possible if no number may begin with 0?.....the answer is 9,000,000 but I'm not sure how to get that, plz explain:)
asked on November 21, 2010 
algebra
I'm a little confused on how to solve this: The number of cricket chirps per minute is given by N(t) = 7.2t  32 Where t is the temperature in degrees Celsius. a. Graph the equation N(t) = 7.2t  32 I have learned a few ways to graph equations. One way
asked on December 16, 2008 
another algebra question
Here's another thing I must solve: For each graph of a function, determine these things: a. f(1) b. domain c. any xvalues for f(x)=2 d. range I can't put the graphs I need up here, but is anyone able to explain how you would find these things? Thank you
asked on December 4, 2008 
Algebra
Once again, I have some confusing problems for math. If you know any answers, even if you only know one, please tell me the answer and walk me through it so I can actually understand how you get to it. Thanks! #1: A space craft travels at a speed of 8/10
asked on November 5, 2008 
AlgebraHelp needed!
Does anyone at least slightly understand direct and inverse variation? I get the basic idea, but I'm still a little confused, especially with inverse variation. What I'm having more trouble with is conversion using direct and inverse variation. Today, my
asked on November 4, 2008 
Economics
At the present price of $20 per unit, the firm is selling 2000 units of a good. It believes that the price elasticity of demand for the good is  1.0. If the price is lowered to $18, then the buyers would be expected to buy a) 1800 units b) 2000units c)
asked on April 30, 2015 
chemestry
how is ionizaion energy different from electron affinity? use a chemical equation to clarify your definition.
asked on March 22, 2011 
Algebra
Another question: A cell phone company charges $60 for a cell phone and $40 per month under its economy plan. Formulate and graph a model that can be used to determine the total cost, C(t), of operating a cell phone for t months. Find the total cost for 5
asked on December 16, 2008 
Algebra please help!
I'm very confused with what I'm learning about right now. We are kind of talking about slopes, functions, graphs, etc. Today, my teacher taught about midpoint and distance, and did not explain very well at all. Would someone please explain to me how to
asked on December 10, 2008 
English
Does anyone know a link to a site that has a list of adjectives starting with the different letters of the alphabet? I have used one before, but I forget its name. I need an adjective that starts with "s," to go with sisters who don't get a long. My title
asked on December 3, 2008 
Algebra! Help needed!
I'll try posting this again since no one responded before. Wow, this one is hard to explain... First, I'll give you the info you need to solve the problem. Tough Cell Batteries Battery Life in Hours Lower Extreme: 84 Upper Extreme: 140 Lower Quartile: 97
asked on November 24, 2008 
chemistry
What is the molality of a sodium chloride solution if 3.5 grams of the salt is added to 998 g of water Your Answer:
asked on September 10, 2008 
biology
what processes in the transparency release dioxide into the atmosphere See the sources in my response to your other post. I hope this helps. Thanks for asking.
asked on September 26, 2006 
Maths
What is minimum value of e^2x+ e^2x Thx
asked on November 7, 2015 
math
the arc length and central angle of a circle are 10cm and 80degrees respectivly. what is the length of the radius?
asked on May 12, 2012 
functions
a square has an area of 100 cm^2. how much bigger is the square's circumscribed circle than the inscribed circle?
asked on May 8, 2012 
Physics
If you can see the face of a friend who is underwater, can she also see you? Please explain. Thanks :)
asked on April 8, 2012 
calculus
Use the limit process to find the area of the region between the graph of the function f(x)= x^3 and the xaxis on the interval [0,2]
asked on December 18, 2011 
Advertising
Is there any advertisment which you think should be banned?
asked on February 21, 2011 
Algebra
Here's the question I'm having trouble with: Tell how you would identify the intercepts for the graph of the equation: 3x + 6y = 18 I'm not exactly sure how you would find the intercepts from this equation. Thanks!
asked on December 18, 2008 
algebra
What does collinear mean?
asked on December 8, 2008 
Algebra
Wow, this one is hard to explain... First, I'll give you the info you need to solve the problem. Tough Cell Batteries Battery Life in Hours Lower Extreme: 84 Upper Extreme: 140 Lower Quartile: 97 Upper Quartile: 110.5 Median: 104.5 If you need more info
asked on November 24, 2008 
Algebra
I have just one math problem that I need a little help with. Please give me the answer, and walk me through it, too, to help me understand it. Thanks! The price of a ring is decreased by 40% and the resulting price is increased by 50%. The final price is
asked on November 6, 2008 
AlgebraReally need help!
Here is the problem that I need to solve: y = ab  ac ² (that is a second power symbol if you can't tell). I need to solve the problem for a. Thank you!
asked on October 25, 2008 
math
the probabilities that 3 friends A,B andC pass a driving test are1/3,1/4,2/5 respectively.All 3 take the test find the probability that(a)aa 3 failed the test (b) only B passes the test(c) only 2 of them pass the test (d)at least 1 passes the test... I
asked on June 26, 2007 
business
what are the tree steps to join a team canadian mission?
asked on June 26, 2012 
Physics
The parabolic TV antenna receives electromagnetic waves from satellites. What is special about these rays?
asked on May 9, 2012 
Physics
Write each number in scientific notation: 1) 15.01 ans. Is it 15.01 x 10 minus to the power of 2?? Am i wrong?
asked on November 24, 2010 
Math grd12
How many tendigit telephone numbers are possible if the first three digits must be different? The answer is 72,000,000,000.... I need the method to get that:)
asked on November 21, 2010 
algebra
Is there a link to a site where I can find a way to solve a Soma Cube, and where each shape would go? Thank you!
asked on December 22, 2008 
spanish
Does anyone know a good review site to review for my Spanish final that is tomorrow? We have just learned simple things like the numbers, alphabet, colors, days of the week, months, etc. A game or some other way of reviewing would be helpful. Thank you!
asked on December 7, 2008 
Algebra
Here is the problem that I need to solve: y = ab  ac (to the second power). I need to solve the problem for a. Thank you!
asked on October 25, 2008 
english
what is meant by the terms "grow organically" in this sentence? The fashion company has been willing to build and grow organically.
asked on December 18, 2013 
english
i neeed help putting my thesis together for my essay reflecting on two books: "the poisonwood bible", and "fall on you knees" plz help asap
asked on June 6, 2012 
chemestry
balance the equations (single displacement) 1. zinc + Iron(II) Chlorine > 2. Zinc + Hydrogen Chlorine >
asked on March 23, 2011 
Math grd 12
In how many ways can you make Rhe border if it requires 15 titles and you use only blue and white ones? Explain your reasoning. The final answer is 8008.
asked on November 21, 2010 
bussines
does it take longer to get your mba if you take bcom over bba?
asked on March 24, 2014 
Maths
How to find the total surface area of a prism, cone and cylinder?
asked on May 28, 2012

Social Studies
Can you tell us all??
posted on November 8, 2018 
SS
What is the answer guys help!
posted on October 26, 2018 
Science
The device shown below contains 2 kg of water. The cylinder is allowed to fall 800 m during which the temperature of the water increases by 2.4°C. Some amount of water is added to the container and the experiment is repeated. All other values remain
posted on March 19, 2018 
algebra 1
there are 60 second in a minute so 8x6=48 that means you can sort 48 in one minute. so if there are 45 minutes..... 45 x48=2160 your answer is 2160
posted on October 4, 2013 
Math
I got 6 as the answr when I did the check it worked! Thanks for the help tho! :)
posted on July 10, 2013 
Math
Thank you! :) that's what I got,is there any more work to it? Because its an 8 mark question!
posted on July 10, 2013 
english
im not sure of what theme to base the thesis on,thats the part i need help with
posted on June 6, 2012 
Mathematics
Thanks!
posted on May 28, 2012 
chemestry
what do the plus signs mean?
posted on March 22, 2011 
Mathematics .
But how would you do it using A^2 + B^2 = C^2 ?
posted on March 9, 2011 
AdvertisingHELP
Thanks, you mean the KY Intense "Socks" right?
posted on February 21, 2011 
Math grd 12
Ok thank you:)
posted on November 21, 2010 
Math grd12
Ohh i accidently added an extra zero...thank you:)
posted on November 21, 2010 
algebra
Thank you so much!
posted on December 22, 2008 
Algebra
Yes! I see, I didn't really think of it that way until after I posted the message. Thank you!
posted on December 18, 2008 
To Everyone at Jiskha
I agree! Thank you, all of the people that are so helpful! :)
posted on December 18, 2008 
spelling
Just wondering: is this supposed to be a real story about something that happened to you, or is it a fictional story? If it is supposed to be a real story, then you might want to talk to your teacher and see if there is another topic you can write about.
posted on December 18, 2008 
7th grade
I don't know how you would check, but by using paranpheses around certain parts of what you are typing in, it will make it do it. Hope I helped!
posted on December 18, 2008