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December 20, 2014

Posts by katie


Total # Posts: 1,716

Calculus
Let F(x) be an antiderivative of sin^3(x). If F(1)=0 then F(8)=? The answer: 0.632 How do I get to that answer? Do I find the antiderivatie and solve for F(x) when x=8?
January 11, 2010

Calculus
If the integral from a to b of f(x)dx=a+2b then integral from a to b of (f(x)+3)dx= ? The answer: 5b-2a How do I get to that answer??
January 11, 2010

Math
If cosx=sqrt{3}/2 and −pi/2<=x<=0 then the exact value of x, in radians
January 10, 2010

elementry math
A box contains three black balls and two gold balls. A ball is selected at random, its color is recorded, and it is then replaced. A second ball is then selected at random and its color recorded. The outcome associated with this type of selection is an ordered pair (first draw...
January 10, 2010

World History
In what ways were the great civilizations of the New World similar to those of the Old World?
January 8, 2010

Chemistry
How do you calculate the molar masses for Strontium Phosphate and Chromium(III)Nitride using significant figures correctly?
January 3, 2010

chemistry
Hi there, I am having a problem with this question, any help would be great. Use the following balanced chemical equation to calculate the mass of carbon dioxide produced from the burning of 5.50 kg of jet fuel which can be represented by the molecule C12H26. You should quote ...
January 2, 2010

5th grade
accb divided by ab
December 16, 2009

education
I don't understand the question or even where to find the answer. I sent an email to the teacher and shes not responding to me.
December 12, 2009

education
Write a 350- to 500-word response to the following: You have the ability to choose three or four books for your students. Based on what you have learned in this course, how can you assess the level of bias and stereotypes in the contents of these texts? What are your criteria...
December 12, 2009

chemistry
Aerosol cans have a label that warns the user not to use them above a certain temperature and not to dispose of them by incineration. Even an empty can contains residual gaseous propellant. For example, the residual pressure in a can is 1.36 atm when it is sitting on a shelf ...
December 6, 2009

math
aly, its not 8 hrs......
December 3, 2009

physics
three dogs play tug-of-war with a chew toy. Each dog pulls with a force that is horizontal with the ground. Determine the net force acting on the chew toy and the acceleration of the chew toy if its mass is 325g. (ignore friction and gravity) Dog 1 pull: 48.2N at 215 degrees ...
December 3, 2009

Physics
If an object is hung from a cable with a weight of 40 N, what is the tension in the two cables? I got some answers, but it would be best if I knew if I was doing the problems correctly before I do the rest of the worksheet. I did a bunch of work, but it's really messy so I...
December 2, 2009

reading/writing
I have to pick a creative selection such as a painting, political cartoon, or lyrics form a song, poem etc, and I need to complete the following. 1. What observations I can make about this selection 2. What questions can I develop form these observations 3. What prior ...
December 2, 2009

Math
Is 3x-4=12 a linear equation? i know that 3x=16 but would that be considered linear? it would just be a vertical line correct?
December 1, 2009

Calculus
An airplane flies at an altitude of 5 miles toward a point directly over an observer. The speed of the plane is 600 mi/hr. Find the rate at which the angle of elevation is changing when the angle is 30 degrees. I found the answer to be 60 radians/hr by taking the derivative of...
November 19, 2009

Physics
In the high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must the athlete leave the ground in order to lift his center of mass 1.75 m and cross the bar with a speed of 0.63 m/s?
November 18, 2009

Physics
An astronaut stands on the edge of a lunar crater and throws a half-eaten Twinkie™ horizontally with a velocity of 2.2 m/s. The floor of the crater is 95.4 m below the astronaut. What horizontal distance will the Twinkie™ travel before hitting the floor of the crater...
November 9, 2009

spanish
how do u anwser this question in spanish ¿Qué haces los sábados?
November 7, 2009

English
gxuwer6dydgusawutdfugasufgusgufguageydfusdgfusgdugudgufgdgufsguftutdefuystfugdsudgfudsgugfusdgfusgu
November 3, 2009

math
Find the z-score for the given raw score, mean, and standard deviation. Assume a normal probability distribution. Raw score = 15, ì = 16 , and ó = 2
November 1, 2009

math
Decide which of the variables described is likely to have a normal or near-normal distribution. 3) a. The amount of change held by a teacher at the end of each day for a year b. The amount of property taxes paid by homeowners in a new "affordable housing" subdivision...
November 1, 2009

social studies
unscramble artiotinm
October 30, 2009

math
nevermind
October 27, 2009

math
Given f(x)=x^2, describe (in words) the transformation on f that would produce g(x)=-2(x+4)^2-7?
October 27, 2009

physical
Write one additional audit question for each of the categories (board, staff, donors and fund raisers, clients/customers, volunteers, and society
October 19, 2009

Science
Changes in the environment are monitored by (blank)satellites.
October 19, 2009

Calculus
We are doing problems with the product and quotient rules, but I'm not sure if I'm doing them correctly. If someone could check my answer I would really appreciate it. The original problem was y = (2x-1)^5 * (4x+1)^-1 and I got the derivative to equal y' = [(2x-1)^...
October 13, 2009

Algebra
I am solving X^4-3x^2+2=0 I factored it to be (x^2-2)(x+1)(x-1) as my book suggested. But why is it three sets of parentheses? How do you know that it's supposed to be three sets of parentheses in opposed to two or four? And how come one of the answers according to my book...
October 8, 2009

Algebra
I have to figure out how x^3+216=0 is factored, and what potential solutions might be. I factored it like this: (x+3)(x+3)(x+24), resulting in the solutions being -3 (double route) and -24. But my book says these are not correct answers. Why not? Can you show me how to do it ...
October 8, 2009

Algebra
x^3-3x^2+3x-9=0. My book factors it to x^2(x-3)+3(x-3)=0, but then it magically becomes (x-3)(x^2+3). I have no idea how it became these numbers. Could you explain please? Thanks!
October 7, 2009

Algebra
Why did you square root the second line? Would you please be able to explain? Thanks!
October 7, 2009

Algebra
4x^4-18x^2=0. I have to find out what x equals by factoring. What I did was Factor 2x^2(2x^2+-9)=0 then 2x^2(2x+3)(x+-3), resulting in -1.5 and three. But these answers are wrong according to my book. Can you show me step by step how to do this correctly? It would be a huge help!
October 7, 2009

Science
the term _________________ refers to rain, sleet, or snow that contain acidic compounds.
September 29, 2009

math
I really need help on my homework :(
September 28, 2009

Chem I
Are there any tricks for remembering solubility rules? I am having a hard time remembering which compounds are soluble and which are not. Any suggestions would be appreciated, I just get the soluble/insoluble compounds mixed up sometimes.
September 28, 2009

world history
can you help me with this question? According to the clockmaker analogy did Voltaire believe that God was present in the world?
September 28, 2009

world history
Was plato's ideal form of government philsopher kings.
September 26, 2009

World History
Can you check my answer: Question: What were the key events that shaped Plato's beliefs? My answer: Plato was influenced by Socrates to search for the meaning of life. But after Socrates was executed Plato focused on how society would bring out the best in people.
September 26, 2009

Calculus
How would you find the derivative of f(x)=1/sqrtx using limits? I know how to do problems with a fraction or a square root, but I can't figure out how to do one with both. I have tried a few different starts, but always end up getting stuck.
September 20, 2009

math
Explain Why is1734 greater than175?
September 17, 2009

arithmetic
nth term expressions whose 8th term is 74
September 17, 2009

Calc
Oh! I've seen that equation we just don't call it a derivative. thanks!
September 10, 2009

Calc
what is a derivitive? And how do you get it (f(x)=2x) from f(x)=x^2-3?
September 10, 2009

10th grade math
Try making both 2 and 1 negative
September 10, 2009

10th grade math
Then you would use FOIL, and find which two numbers multiply to get 2, and add to get -3
September 10, 2009

10th grade math
do you know how to use the diamond? or were you taught with the FOIL square?
September 10, 2009

Calc
Thank you.
September 10, 2009

Calc
I don't understand how you got from lim (1+sinx/x)/(1+cosx/x) to the answer. I know that sinx/x is 1 so would the top be 2?
September 10, 2009

Calc
How do you find the lim as x->infinity of (x+sin(x))/(x+cos(x))??
September 10, 2009

Calc
How do you find the avarage rate of change for f(x)=1+sin(x) in the interval [0,pi/2]?
September 10, 2009

Calc
where did you get f(x)=2x??
September 10, 2009

Calc
How do you find the horizontal tangent for the equation f(x)=x^2-3? Algebraically
September 10, 2009

calculus
use inequslity notation to describe the set of any numbers. Define any variables you use. No item at Sarah's Variety Store cost more than $2.00. The price of a gallon of gasoline varies from $1.099 to $1.399. Need help please
September 8, 2009

Math
The answer to. What do they call the international hula hoop championships isThe Whirl Series.
September 1, 2009

5th grade
during an art contest at your school, you and a classmate each won blue ribbons for one-third of the pieces you entered in the contest. You won 2 blue ribbons and your classmate won 3 blue ribbons. Explain how this could be
September 1, 2009

Science
i dont know
August 10, 2009

Math
that's not right can someone please help.
July 21, 2009

Math
Please help me, thank you. A 100 kg astronaut is standing on the outside surface of a 4.50 x 10^4 kg spacecraft. The astronaut jumps away from the spacecraft at 8.00 m/s. What happens to the spacecraft?
July 21, 2009

Math
Can someone please help me. I don't get this question. Thank You In order to avoid a severe storm at sea a ship is set to sail 200 km at an angle of N40*E, then 150 km at an angle of S60*E. What is the displacement of the ship?
July 21, 2009

French
1. les quatre années dernières 2. je suis desolee. je ne sais pas. Vous avez [word for influence]... maybe?
June 8, 2009

Math
how do i tell the difference between a binomial distribution and a poisson distribution?
June 8, 2009

Statistics-Concept Question
i know how to use both poisson and binomial tables and i know the formulas for calculating means and standard deviations, i just have a hard time figuring out when i need to use the binomial formulas or when to use the poisson formulas.
June 8, 2009

Statistics-Concept Question
I have a stats exam tomorrow and I understand the material pretty well, but i sort of get confused. because my homework comes from a section, i know what formulas to use, but i took a practice test and i'm having a hard time identifying whether a problem is poisson or ...
June 8, 2009

Marine Biology
What zone is where most life exists?
June 7, 2009

Physics
i have no idea, i just wrote what the question said. but yes thats what i interpreted it to mean
May 31, 2009

Physics
I don't understand snell's law ( nsin(0)=nsin(0) ) and how to use it with refraction. also how do i apply that to this problem: 'a light ray enters a square piece of plastci (n=1.39) near a corner. as it encounters the adjacent side it gets refracted along the ...
May 31, 2009

Math
Can you tell me how you would answer this question? My teacher says that one answer is correct but I think that my answer is correct. I want a second opinion. A soccer coach purchases 12 uniforms for 17.50 each. He buys 6 soccer balls for 8.58. How much did he spend in all? I ...
May 28, 2009

math
Can you tell me how you would answer this question? My teacher says that one answer is correct but I think that my answer is correct. I want a second opinion. A soccer coach purchases 12 uniforms for 17.50 each. He buys 6 soccer balls for 8.58. How much did he spend in all? I ...
May 28, 2009

social study
President Obama
May 28, 2009

geometry
What is the formula for the area of a rhombus
May 27, 2009

science
compare the amount of energy used in the United states with the ammount used worldwide. Write a paragraph explaining the social and economic reasons for the difference
May 27, 2009

Science
What keeps cheese warmer? aluminum or plastic wrap?
May 17, 2009

8th grade
how do you simplify: 3x+6 ---- 3x^2
May 11, 2009

Math
Can someone please help me with this question. Thank you! The information in the table represents the temperature of a cup of hot chocolate in relations to time. Time(t) Temperature(T) 0 60 5 54 10 48 15 44 20 41 Use the exponential regression function in your calculator to ...
May 10, 2009

Math
Hi, I asked this question yesterday and I am still struggling with it, can someone please help me, thank you! State the image of the given point after the following transformation: (2,7) after a vertical stretch by a factor of 1/2 about the line y=1 followed by a horizontal ...
April 26, 2009

Math
Can someone please help me with this question. Thank you! State the image of the given point after the following transformation: (2,7) after a vertical stretch by a factor of 1/2 about the line y=1 followed by a horizontal stretch by a factor of 3 about the line x=3.
April 25, 2009

French
Could you please check these thanks. Directions: Complete with the verb mettre. 1. Qu'est-ce qu'ils -------- dans leur sac à dos? Ils ------------ Answer 1: mettent Answer 2: mettent 2. Qu'est-ce que tu --------- dans ton sac à dos? Je ---------- ...
April 25, 2009

French
Could you please check these thanks. Directions: Answer using the correct form of mettre. 1. Tu mets un survêtement quand tu fais du jogging? Answer: Oui, je mets un survêtement quand je fais du jogging. 2. Tu mets la table pour le dîner? Answer: Oui, je mets...
April 25, 2009

Quick math question
Thanks for the advice Mrs. Sue that's exactly what I'll do. I also make up problems by myself and have someone check them for me.
April 24, 2009

Quick math question
Can anyone give me a link to a free online algebra test for 9th graders. I have a test on Monday based on algebra to see if I can move on to Geometery and I need a test to see if I'm ready. Thanks
April 24, 2009

Math
the original problem was: Solve: sin(3x)-sin(x)=cos(2x) so far i've gotten to: sin(x)(2sin(x)cos(x)-1)=cos^2(x)-sin^2(x) Where would I go from here?
April 23, 2009

Math, Pre-Calc
the original problem was: Solve: sin(3x)-sin(x)=cos(2x) so far i've gooten to: sin(x)(2sin(x)cos(x)-1)=cos^2(x)-sin^2(x) Where would I go from here?
April 23, 2009

Math
Correct to the nearest tenth of a radian, state the x-intercepts and the y-intercepts for 0<x<2pi.
April 19, 2009

math
Hi! I really need help with this question. Please help me. Thanks! If f(x)=6cosx-1, algebraically determine algebraically the x intercepts to the nearest tenth. On the domain x E R.
April 18, 2009

math
Hi, Can you please help me. Thank-you. The present population of a town is 42000. a) Determine the population 4 years ago if the growth rate has been a constant 4%/year. b) Determine the number of complete years that have passed since the town first had a population of less ...
April 18, 2009

word
Physode.
April 17, 2009

Applications
Thanks!
April 16, 2009

Applications
I'm applying to the local Chamber of Commerce for a scholarship open to high school juniors to become ambassadors for our town, and it says that a cover letter and job resume are required. What should a cover letter be in this situation?
April 16, 2009

Math - Pre-Calc
So far I got it down to ((4/3)n^3+(11/6)n^2)/((4/3)n^3)+(2n^2)+(2/3)n). Would I be able to cancel out the ((4/3)n^3)s? So that it would be ((11/6)n^2)/((2n^2)+((2/3)n))? Or can I simplify that even futher by combining the (n^2)s?
April 13, 2009

Math
So far I got it down to ((4/3)n^3+(11/6)n^2)/((4/3)n^3)+(2n^2)+(2/3)n. Would I be able to cancel out the ((4/3)n^3)? So that it would be ((11/6)n^2)/((2n^2)+(2/3)n)? Or can I simplify that even futher by combining the n^2s?
April 13, 2009

Math
How would I begin to simplify this?? (4((n(n+1)(2n+1))/6)-4((n(n+1))/2)+n)/(4((n(n+1)(2n+1))/6))
April 13, 2009

language arts
Because all of the other days are week (weak) days.
April 13, 2009

Math
How do you find cos15
April 7, 2009

Spanish
also for the first one Adonde vas a comer cuando tienes hambre? for the answer you can have: voy al resturante
April 6, 2009

10th grade chemistry
How many molecules of Hydrogen gas formed when 48.7 grams of sodium added to water
April 6, 2009

4th grade
Geometry, Isoseles right triangle. Line segments MN and NO are ----? A. parallel lines, B. opposite angles, C. perpendicular lines, D. obtuse angles. I can't see that any of these are the answer to the question. Can you help me?
April 6, 2009

Anatomy
What accounts for more than 60% of the total bran weight? I looked in my book and it said one part accounted for 85% and then another part said 40%. I think it's the cerebral hemispheres, but I don't know for sure.
March 29, 2009

kindergarten
really just clap your hand gran mo ther son its 3
March 27, 2009

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